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Editorial note: This publication and Quirky Cotton Collective share an owner. This is not an independent review.

There is a ball at the bottom of a curved ramp, and there is a dashed circle at the top. The text above them reads I HAD POTENTIAL in white capitals. That is the entire design. No punchline, no caption, no arrow labeled “me.” Just a diagram of something that could have happened and a statement that it didn’t.

The shirt is I Had Potential Funny Physics Pun Sarcastic Minimalist Quote, and the artwork is doing something more specific than the retail title suggests. The phrase “physics pun” is doing a lot of work in that listing. What’s actually printed is a mechanics diagram — the kind you’d sketch on a whiteboard before deriving an equation — with the punchline left implicit. That gap between the diagram and the text is where the joke lives, and it’s worth reading closely because the design is more careful than most slogan shirts.

What the diagram actually shows

Look at the geometry. The dashed circle sits at the upper left, on a ledge. The solid ball rests at the lower right, on a flat surface. Between them is a curved ramp descending from left to right. The dashed circle represents the ball’s initial position — the potential state, the before. The solid ball is the after. The ramp is the path between them.

This is a potential energy diagram, or at least a cartoon of one. In mechanics, an object at the top of a ramp has gravitational potential energy. Release it, and that potential converts to kinetic energy as it descends. The ball at the bottom has spent its potential. It is now just a ball on a flat surface, going nowhere.

The shirt says: I had potential. The diagram shows: the ball had potential. Both statements are true in the same way. The ball did have potential — it was at the top of the ramp, and gravity was ready to act on it. Now it’s at the bottom. The potential is gone. What remains is a solid circle and a flat line.

That’s the joke. It’s not a pun in the wordplay sense. It’s a visual analogy that treats a personal statement as a physics problem, and the physics problem resolves the same way the personal statement does: the energy was there, and now it isn’t. The dashed circle is the ghost of what could have been. The solid ball is what’s left.

Why the curved ramp matters

A straight diagonal would have been easier to draw. A straight line from upper left to lower right is the default way to show decline — a graph going down, a stock chart, a career trajectory. But the ramp here is curved, and that changes the reading.

A curved ramp suggests acceleration. On a straight incline, an object slides at a constant rate if friction balances gravity. On a curved ramp — specifically a concave-up curve, like the bottom half of a parabola — the object accelerates as it descends. The slope gets steeper. The ball speeds up. The potential energy doesn’t just convert to kinetic energy; it converts faster and faster until the ball hits the flat and stops.

That’s a more specific kind of failure than a straight decline. It’s not a slow slide. It’s a build-up followed by a sudden stop. The ball doesn’t drift down; it gathers speed and then hits the bottom. The dashed circle at the top is the moment before release. The solid ball at the bottom is the moment after impact. Everything in between is the curve.

I don’t know if the designer intended that reading. The visual observation is just that the ramp is curved, not straight. But the curve is there, and it makes the diagram more interesting than a simple before-and-after. It implies a process, not just a state change. The potential didn’t disappear; it was spent.

The difference between a slogan and a diagram

Most sarcastic shirts rely on text alone. The words do the work, and the design is just typography. This one splits the labor. The text makes the claim — I had potential — and the diagram provides the evidence. The claim is abstract; the diagram is specific. Together they form an argument.

That’s a different rhetorical move than a slogan. A slogan asserts. A diagram demonstrates. The shirt isn’t just saying “I had potential” and expecting you to laugh at the self-deprecation. It’s showing you a ball that had potential and lost it, and then asking you to map that onto the text. The mapping is the joke. You have to do the work of connecting the dashed circle to the past and the solid ball to the present.

This is why the design feels more like a whiteboard sketch than a meme. It’s terse. It’s labeled. It uses visual conventions — dashed lines for absent objects, solid lines for present ones — that anyone who’s taken a physics class will recognize. The humor is dry and structural. It doesn’t tell you to laugh. It just presents the diagram and lets you notice that the ball at the bottom is not going anywhere.

What the shirt doesn’t claim

It’s worth being clear about what the artwork is not doing. It’s not making a scientific claim about energy conservation or the second law of thermodynamics. It’s not a proof of anything. It’s a cartoon that borrows the visual language of physics to make a point about personal failure, and the borrowing is loose. The ball on the flat ledge isn’t literally at rest forever; it could be pushed. The dashed circle isn’t literally a ghost; it’s just a convention for “this was here before.”

The shirt also doesn’t specify what kind of potential is being discussed. Gravitational potential? Electric potential? The potential of a system to do work? The diagram is generic enough to cover all of them, which is part of why it works. “Potential” in physics is a broad concept — it’s the capacity for something to happen, stored in a configuration. The shirt uses that breadth. It doesn’t say what the potential was for. It just says it’s gone.

That vagueness is a feature, not a bug. If the shirt specified “I had potential to finish my PhD” or “I had potential to get promoted,” it would be a different joke — more specific, more bitter, less reusable. By keeping the diagram abstract, the shirt lets the wearer fill in the blank. The ball could be anything. The ramp could be any path. The flat ledge is wherever you ended up.

The dashed circle and the solid ball

The two circles are the most important part of the design, and they’re easy to overlook. The dashed circle is empty — it’s an outline, a placeholder, a thing that isn’t there anymore. The solid ball is filled — it’s present, it’s real, it’s what you have. The visual contrast between dashed and solid is doing the emotional work of the shirt.

In technical drawing, a dashed line means hidden or absent. A solid line means visible or present. The shirt uses that convention to show you the before and after in a single frame. The dashed circle is the potential you had. The solid ball is the potential you spent. They’re the same object at different times, and the drawing shows both at once.

That’s a neat trick. It compresses a narrative into a static image. You don’t need an arrow or a caption to understand that the ball started at the top and ended at the bottom. The dashed circle tells you where it was. The solid ball tells you where it is. The ramp connects them. The text tells you what it means.

Who this shirt is for

The listing calls it a “funny physics pun,” and the keyword data shows people search for “i had potential shirt” and “i had potential physics shirt” in the low thousands per month. That’s not a mass-market audience, but it’s not niche either. It’s the kind of design that appeals to people who have taken a physics class, or who work in technical fields, or who just like diagrams that double as jokes.

I’d wear it to a team meeting where someone asks for a status update on a project that’s been “in progress” for six months. I’d wear it to a conference where the keynote is about “unlocking potential.” I’d wear it anywhere that the word “potential” is being used unironically, because the shirt is a quiet rebuttal to that word. Potential is a promise. The shirt is about what happens when the promise isn’t kept.

It’s also just a clean design. White on a dark shirt, minimal text, a simple diagram. It doesn’t rely on a copyrighted image or a specific meme format. It’s original artwork that uses a common phrase, and the phrase is common enough that it doesn’t feel like it’s trying too hard. The diagram makes it specific. The text makes it universal. That combination is why it works.

The verdict

This is a well-constructed piece of visual humor. The diagram is legible, the text is terse, and the two halves of the design reinforce each other without over-explaining. The curved ramp is a nice touch — it implies acceleration, which makes the failure feel more earned. The dashed circle and solid ball are a clean way to show before and after in a single frame.

If you’re the kind of person who laughs at a graph that goes down and to the right, this shirt is for you. If you’ve ever explained a joke by drawing a diagram, this shirt is for you. If you’ve ever had potential and watched it turn into a solid ball on a flat ledge, this shirt is for you. It doesn’t cure anything. It doesn’t improve your life. It just says what happened, in the language of physics, and lets you decide whether to laugh.

That’s enough. The ball is at the bottom. The ramp is behind it. The dashed circle is empty. The shirt is done.

Editorial note: This publication and Quirky Cotton Collective share an owner. This is not an independent review.

The artwork on the Not Friendly Do Not Touch shirt is a warning sign. Not a metaphor for one — an actual warning sign, rendered in the visual grammar of industrial safety: a yellow caution triangle, a crossed-out hand, and the blunt imperative NOT FRIENDLY DO NOT TOUCH set in the kind of lettering you would find on a server rack door or a high-voltage panel. The design borrows the authority of signage. That borrowing is the interesting part, and it is also where the design runs into trouble.

Warning signs work because they are backed by something. A yellow triangle on a transformer means there is current behind the panel. A crossed-out hand on a chemical drum means the contents will hurt you. The sign is a promise about consequences. The shirt has no such backing. It is a warning label with no enforcement mechanism — a boundary statement wearing the costume of a hazard placard. That gap between the visual language and the actual stakes is what makes the design worth looking at closely, and it is also what makes it a useful object for anyone who spends their working life around diagrams, schematics, and the difference between a label and a guarantee.

Look at the components. The caution triangle is the universal signal for pay attention, something here can hurt you. The crossed-out hand is the universal signal for do not interact. The text is the universal signal for this is not a suggestion. Every element is doing its job. The composition is clean, legible at a distance, and immediately readable to anyone who has ever worked in a lab, a server room, or a manufacturing floor. If you have spent any time reading boardview files or probing a live rail, you already know this visual language in your bones. It is the language of stop, look, measure before you touch.

But here is the problem with borrowing that language for a t-shirt: the sign is not enforceable. A warning sign on a machine is backed by physics. Touch the wrong rail and you get a burn, a dead short, a blown MOSFET. The shirt is backed by nothing but the wearer’s willingness to enforce the boundary, and most people are not going to enforce it. The design makes a claim — I am not friendly, do not touch me — that the wearer cannot actually guarantee. That is not a flaw in the artwork. It is the joke. But it is also a real observation about how boundary statements work in public: they are requests, not commands. They are signage without a lockout/tagout procedure behind it.

This is where the shirt becomes more than a novelty. For readers who spend their days diagnosing failures — tracing a shorted rail, checking a charging circuit, figuring out why a laptop will not POST — the design is a reminder that labels are not the same as mechanisms. A warning sign on a board tells you where the danger is. It does not prevent you from touching it. The schematic shows you the rail. The boardview shows you the test point. The multimeter tells you whether the rail is live. The sign is just the first step. The shirt is the first step, too. It announces a boundary. It does not enforce one.

That distinction matters in work culture as well. Teams often confuse slogans for policies. A poster that says speak up is not the same as a process that protects the person who speaks. A shirt that says do not touch is not the same as a person who will stop you. The design is funny because it is honest about that gap. It is a warning sign that knows it is only a warning sign. It is a boundary statement that knows it is only a boundary statement. The crossed-out hand is not a force field. It is a request, printed on cotton, hoping you will read it.

There is also a quieter reading. The word friendly is doing a lot of work here. The shirt does not say dangerous or fragile or authorized personnel only. It says not friendly. That is a social statement, not a safety statement. It is a warning about temperament, not voltage. The caution triangle and the crossed-out hand are borrowed from industrial safety, but the text is borrowed from interpersonal communication. The mismatch is deliberate. It takes the visual authority of a hazard sign and applies it to something that is not hazardous at all — just unavailable. That is the joke, and it is a good one. It is also a fairly precise description of how many technical people experience unwanted social interaction: as a hazard to be managed, not a pleasure to be enjoyed.

I am not going to claim the shirt cures anything or improves anything. It is a piece of printed cotton. But as a piece of visual communication, it is well-constructed. The hierarchy is clear: triangle first, hand second, text third. The colors are standard caution yellow and black, which means the design reads correctly even at a glance. The lettering is legible. The crossed-out hand is unambiguous. If you were designing a warning sign for a piece of equipment, you would make similar choices. The fact that those choices work just as well on a t-shirt is a testament to how deeply the language of industrial signage has penetrated everyday life.

What the shirt does not do is solve the problem it describes. It does not make people leave you alone. It does not create a personal bubble. It does not enforce a boundary. It is a sign, and signs are only as good as the system behind them. That is true of the shirt. It is true of the warning labels on the bottom of a laptop. It is true of the do not remove sticker on a warranty screw. The sign is not the mechanism. The sign is the request. The mechanism is what you build around it.

If you are the kind of person who reads schematics for fun, you already know this. You know that a label on a connector does not stop you from plugging it in backwards. You know that a warning in a service manual does not stop you from shorting a rail. You know that the only real protection is understanding the circuit. The shirt is a label. It is a good label. It is not a circuit. It is not a lock. It is not a guarantee. It is a warning sign that knows exactly what it is, and that is why it works.

The design is available as a standard t-shirt from Quirky Cotton Collective. If you want a warning sign that does not pretend to be anything more than a warning sign, it is a solid choice. If you want a boundary that enforces itself, you will have to build that yourself. The shirt will not do it for you. No sign will.

Four tiles. 53 I, 74 W, 22 Ti, 16 S. Read the symbols left to right and you get I W Ti S — which is not a word, and not quite the sentence printed above it. The shirt says I WEAR THIS SHIRT PERIODICALLY, and then it hands you a row of element tiles that refuse to spell periodically, or wear, or anything else you could say out loud. That refusal is the whole joke, and it is a better one than most chemistry shirts manage.

Here is what the tiles actually encode. Iodine is element 53, symbol I. Tungsten is 74, symbol W — from Wolfram, which is the kind of detail that makes a chemistry teacher’s eye twitch in a good way. Titanium is 22, Ti. Sulfur is 16, S. So the tiles spell IW Ti S, and if you squint and let the atomic numbers do the talking, you get 53-74-22-16, which is not a date, not a constant, and not a hidden message. It is just four elements arranged to look like they are saying something. They are saying I W Ti S. That is the punchline.

The pun lives in the gap between the sentence and the tiles. Periodically is the adverb that means from time to time, and it is also the adverb that means in a pattern of periods, which is what the periodic table is. The shirt is not claiming you wear it on a schedule. It is claiming you wear it in the manner of the periodic table, which is a nonsense claim, and the tiles make the nonsense visible. A lesser design would have spelled periodically out of element symbols — there is a whole genre of those, and they are fine, but they are crossword answers. This one is a diagram of a failed translation. The sentence is the intent. The tiles are the execution. The joke is that the execution does not match, and everyone who reads it has to do the same double-take: wait, does that spell something? No. It spells I W Ti S.

That is why the shirt works as an object for people who spend their days reading diagrams. If you have ever traced a signal on a schematic only to find the net name is a lie — a rail labeled +3V3 that measures 2.9, a test point that goes nowhere, a silkscreen that says U7 on a board where U7 is a different chip — you already know this feeling. The label and the thing are not the same. The shirt is a tiny, wearable version of that gap. It is not a chemistry lesson. It is a diagram joke, and it is aimed at the part of your brain that checks whether the label matches the pin.

I am not going to pretend the shirt teaches anyone the periodic table. It does not. The atomic numbers are correct — 53, 74, 22, 16 — but the symbols are doing decorative work, not instructional work. If you want a teaching aid, buy a poster. If you want a shirt that makes a chemist and a repair tech both pause for half a second, this is the one. The design is legible from across a room: four tiles, four numbers, one sentence. The sentence is the setup. The tiles are the punchline. The punchline is that there is no punchline, just a row of elements that almost say something.

There is a version of this shirt that would have been a slogan. I wear this shirt periodically — lowercase, no tiles, just the words — is a slogan. It is a terse message about frequency, and it is fine, and it is forgettable. The tiles change the register. They turn a slogan into a diagram, and a diagram into a small puzzle, and a puzzle into a joke about the difference between what a label says and what a label means. That is the difference between a shirt you wear and a shirt you read. The best work-culture objects are the ones that reward a second look, and this one does, because the second look is where you notice the tiles do not spell the sentence. The first look is the pun. The second look is the punchline.

If you want the object itself, it is the I Wear This Shirt Periodically chemistry element-tile pun from Quirky Cotton Collective. The listing title calls it a funny chemistry science pun, which is accurate enough, but the interesting part is not the humor. It is the structure. Four tiles, four numbers, one sentence that does not match. That is a design choice, and it is the right one.

Editorial note: This publication and Quirky Cotton Collective share an owner.

The reason this matters for the kind of reader who ends up here — the one who owns a multimeter and a hot air station and a shelf of off-lease ThinkPads — is that the shirt is a reminder that labels are not evidence. A silkscreen is not a schematic. A product title is not a specification. A sentence on a shirt is not a statement of fact. The tiles are the honest part: they show you exactly what they are, four elements in a row, and they let you decide whether the sentence above them is a promise or a joke. It is a joke. But it is a joke with a diagram in it, and that is the kind of joke that lasts longer than the slogan version.

Wear it to a lab meeting. Wear it to a repair bench. Wear it to a conference where someone will squint at your chest and try to read the tiles and fail, and then laugh, and then ask you what element 74 is. Tell them tungsten. Tell them it is from Wolfram. Tell them the shirt does not spell what it says, and that is the point. Then go back to the thing you were doing, which is probably reading a schematic and checking whether the label matches the pin. It usually does not. The shirt knows.

Editorial note: This publication and Quirky Cotton Collective share an owner.

Look at the rectangle before you look at the joke. On the composition notebook shirt, the printed artwork is a black-and-white speckled notebook cover: a dark binding strip down the left edge, a white ruled label headed COMPOSITION, and inside that label an outlined ghost and an outlined pumpkin. The garment is a printed notebook cover, not a physical notebook. That distinction matters more than it first appears, because the design is not a slogan about school. It is a diagram of a familiar object, and diagrams carry their own kind of argument.

I keep coming back to the label. A real composition notebook’s label is a small piece of administrative real estate: name, subject, period, teacher. It is the part of the object that asks you to declare what the notebook is for. Here, the label has been filled in with a ghost and a pumpkin instead. That is the whole design in one move. The form that normally holds a student’s identity has been overwritten with the two least administrative marks in the Halloween vocabulary. No name. No subject. No period. Just the outline of something that is not there and something that is.

Read that way, the shirt is less a costume than a small visual essay about labeling. Anyone who has ever written a hostname on a machine, taped a label to a shelf of drives, or filled out a repair tag knows the feeling. The label is where a thing becomes accountable. It is where you say what this object is, who owns it, and what it is supposed to do. The ghost and pumpkin are what happens when you leave the label blank and let the season fill it in. I do not think the design is making a technical argument. I think it is making a human one: the surface that usually holds a name can also hold a mood.

The binding strip is the other half of the composition. It runs down the left side, dark against the speckled field, and it does the same work a spine does on a shelf: it tells you which way the object opens. On a shirt, that strip is a quiet piece of graphic discipline. It keeps the rectangle from floating. It gives the eye an edge to start from. Without it, the speckled field would read as texture. With it, the field reads as a cover. That is the difference between a pattern and an object, and the design chooses the object.

I have seen a lot of teacher Halloween shirts that work by adding. Add an apple. Add a pun. Add a row of pencils and a cursive line about being blessed. This one works by subtracting. The notebook cover is already a recognizable shape. The label is already a recognizable form. The only additions are two outlines, and both of them are deliberately simple. They are drawn the way you would draw them on a whiteboard during a five-minute break, not the way you would draw them for a greeting card. That restraint is what makes the shirt usable in a staff room. It is a costume you can wear while doing your actual job.

There is a practical point buried in that. A group costume only works if it survives the school day. Anything that requires a hat, a wig, a prop, or a full face of makeup will be abandoned by second period. A printed notebook cover is a costume that stays on because it is just a shirt. The ghost and pumpkin are small enough to read up close and quiet enough not to disrupt a lesson. If you are coordinating a team, that is the feature to notice: the design does the costume work without asking the wearer to perform all day. I am not claiming it improves anything. I am saying the design is built for the conditions teachers actually work in.

The phrase on the label is worth a second look, too. COMPOSITION is a word with two lives. In a classroom, it means a written exercise. In design and engineering, it means the arrangement of parts into a whole. The shirt does not lean on either meaning. It just puts the word where it belongs on the object and lets you bring your own association. That is a more generous design than a slogan would be. A slogan tells you what to think. A label asks you to fill it in. The ghost and pumpkin are one answer. A group of teachers in matching shirts is another. The blank space is the point.

I would not call this a meme shirt, and I would not call it a generic school shirt. It is a specific object rendered specifically: speckled cover, dark spine, ruled label, two Halloween outlines. The specificity is what makes it work as a group costume. Everyone wears the same cover, and the cover is recognizable from across a hallway. The design does not need a caption to explain itself. It needs a wearer who already knows what a composition notebook looks like, which is most people who have ever been in a classroom. That shared recognition is the entire mechanism.

If you are the person who coordinates the group, the useful question is not whether the shirt is funny. It is whether the shirt is legible. Legible means a parent at pickup can tell what the group is doing without asking. Legible means the design reads at ten feet and still reads at two. The composition notebook cover passes that test because the silhouette is doing the work. The ghost and pumpkin are the punchline, but the rectangle is the setup. Get the setup right and the punchline does not have to shout.

That is the argument I would make for this design over a more literal costume. A literal notebook costume is a prop. A printed notebook cover is a reference. References are easier to wear, easier to coordinate, and easier to put back in the drawer on November first. The shirt is not pretending to be a notebook. It is quoting one. Quotation is a lighter load, and for a teacher on a Friday in October, lighter is better.

So read the label one more time. COMPOSITION, in plain type, on a ruled white field, with a ghost and a pumpkin where a name would go. It is a small joke about the difference between a form and a person. The form asks you to declare yourself. The person draws a ghost. That is not a failure of the form. It is the form being used the way it was always going to be used, by someone who has other things to do.

There is a specific kind of eBay listing that every ThinkPad tech learns to spot: a T450 with a cracked screen, no RAM, no drive, and a price that is roughly one-third of what a single replacement motherboard costs. The seller calls it “for parts.” The math calls it a donor.

This article is about when that math works, when it does not, and how to tell the difference before you spend the money. It is grounded in the T450 platform specifically, because that is where the donor economics are clearest, but the same reasoning applies to the Latitude E5470 and the EliteBook 840 G3.

What the T450 actually is, and why it matters for harvesting

The ThinkPad T450 is a 14-inch business notebook released in 2015, built around a 5th-generation Intel processor. iFixit lists three model numbers for the platform: 20BU, 20BV, and 20DJ. That matters because FRU compatibility is not always uniform across those sub-models, and a donor board pulled from a 20BV may not drop into a 20DJ chassis without checking the HMM’s FRU list for that specific machine type.

iFixit’s T450 device page enumerates the replaceable assemblies: CMOS battery, daughterboard, external battery, fan and heatsink assembly, internal battery, motherboard, RAM, SSD, smartcard reader, speakers, thermal paste, touchpad, and Wi-Fi card. It also lists parts categories including antennas, batteries, boards, buttons, cables, caps, case components, feet, hinges, keyboards, motherboards, power adapters, screens, and screws. That list is the harvest menu. Everything on it is a candidate for pulling from a dead donor.

What iFixit does not give you is the FRU-to-model cross-reference. For that you need the Hardware Maintenance Manual. The Lenovo T450 HMM (document SP40A26003) was not retrievable at the time of writing, so I cannot quote its FRU tables directly here. If you are doing this work, get the HMM for your exact machine type before you buy anything. The same applies to the T450s HMM (SP40A26004), which is a different document for a different chassis.

The three failure modes where a donor wins

Not every dead T450 is worth buying. The donor math only works when the parts you need are expensive, scarce, or both. Here are the three cases where harvesting consistently beats ordering.

1. The motherboard is dead but the chassis is intact

A replacement T450 motherboard, new old stock or refurbished, is the single most expensive FRU in the machine. A complete dead T450 with a good board but a cracked screen often sells for less than the board alone. If you have a T450 with a failed board and a good screen, buying the donor and swapping the board is straightforward arithmetic.

The catch: you need to verify the donor board is actually good before you commit. A board that powers on but has no backlight is not a good donor board. A board that charges but does not POST is not a good donor board. The only way to know is to test it, which means you need a known-good chassis to drop it into, or you need to be willing to gamble.

2. The keyboard is worn or liquid-damaged

T450 keyboards are a wear item. iFixit lists ten keyboard variants for the platform, which tells you there is no single part number that covers every machine. A donor machine with a clean keyboard is often the cheapest way to get one, because aftermarket keyboards for this generation are hit-or-miss on feel and backlight behavior.

Before you pull a keyboard from a donor, check for liquid damage on the underside. Corrosion on the ribbon connector or the membrane is not always visible from the top. If the donor was sold as “liquid damage,” assume the keyboard is contaminated and do not harvest it.

3. The display assembly is cracked but the panel is good

This is the reverse of the usual situation. If your machine has a good panel and a broken hinge or bezel, a donor with a cracked panel but intact hinges is useful. If your panel is cracked and the donor’s panel is good, you are harvesting the panel, not the assembly. Either way, the donor is cheaper than a new panel if you can find one with the right connector and mounting tabs.

The T450 uses a 14-inch panel with a specific connector orientation. iFixit lists two screen variants for the platform, which suggests there is more than one panel type in circulation. Check the connector before you buy.

When harvesting is a waste of time

The donor math fails in three predictable ways.

When the part is cheap and new. RAM, SSDs, and Wi-Fi cards are not worth harvesting from a dead machine unless you are already pulling the board and the RAM comes with it. A new 8GB DDR3L stick costs less than the time it takes to test a pulled one.

When the part is a wear item with unknown history. Fans, thermal paste, and batteries fall into this category. A donor fan may have thousands of hours on it. A donor battery may have a swollen cell. iFixit lists two battery variants for the T450 (internal and external), and both are wear items. Do not harvest a battery unless you can read its cycle count and confirm it holds a charge.

When the donor is liquid-damaged. Liquid damage is not always localized. A machine that took a spill on the keyboard may have corrosion on the board, the daughterboard, and the connectors. If the listing says “liquid damage,” assume every part is suspect until you inspect it.

The practical procedure: buying and testing a donor

Here is a sequence that assumes you have a known-good T450 chassis to test parts in, or you are willing to accept the risk of buying blind.

1. Identify your machine type. Check the bottom cover for the model number (20BU, 20BV, or 20DJ). This determines which HMM you need and which FRU list applies.
2. Get the HMM for your machine type. The T450 HMM is SP40A26003. The T450s HMM is SP40A26004. Do not assume they are interchangeable.
3. List the FRUs you actually need. Be specific. “Motherboard” is not enough. You need the FRU number for the board that matches your CPU, GPU, and port configuration.
4. Search for a donor that contains those FRUs. A dead T450 with a good board and a cracked screen is a donor. A dead T450 with a good screen and a dead board is a different donor.
5. Before you buy, ask the seller for the machine type and the FRU numbers on the parts you need. If they cannot provide them, assume the parts are not what you need.
6. When the donor arrives, test before you harvest. Power it on if possible. Check for POST, backlight, and charging behavior. If it does not power on, you are harvesting blind.
7. Harvest with the right tools. For the T450, you need a Phillips #00 screwdriver, a spudger, and a plastic opening tool. iFixit lists these as the common tools for the platform.
8. Test each harvested part in a known-good chassis before you install it in a customer machine. This is not optional. A harvested board that fails after installation costs you the labor twice.

Warnings before irreversible actions

Do not harvest a battery from a liquid-damaged machine. Lithium cells can be compromised by moisture. If the battery shows any swelling, corrosion on the connector, or unusual voltage, dispose of it properly. Do not install it in a customer machine.

Do not harvest a board from a machine that has been exposed to liquid. Even if the board looks clean, corrosion can be under the BGA packages. A board that works today may fail next week. If you cannot inspect the board under magnification, do not use it in a repair you are charging for.

Do not assume FRU compatibility across model numbers. The T450, T450s, and X250 share some parts and not others. The HMM is the only reliable source for this. If you do not have the HMM, do not guess.

What the documentation does and does not tell you

The iFixit T450 page gives you the repair guides and the parts categories. It does not give you the FRU cross-reference. The Lenovo HMM gives you the FRU list, but the T450 HMM was not retrievable at the time of writing. The Dell Latitude E5470 owner’s manual and the HP EliteBook 840 G3 manual were also not retrievable. If you need those documents, get them from the manufacturer’s support site directly.

What this means for the donor math: you can use iFixit to understand what is replaceable and how to replace it. You cannot use it to confirm that a part from a 20BV will work in a 20DJ. For that, you need the HMM. If you do not have the HMM, you are guessing.

The verdict: is the donor worth it?

For a T450 with a dead board and a good screen, yes. The donor math works because the board is the expensive part and the donor is cheaper than the board alone. For a T450 with a dead keyboard and a good board, maybe. It depends on whether you can find a donor with a clean keyboard for less than the cost of a new one. For a T450 with a dead battery, no. Batteries are wear items and you cannot verify their history.

If you are charging a customer for this repair, bill the donor machine as a parts cost, not as a repair. The labor is the same whether you harvest or order new. The difference is the risk. A harvested part has unknown history. A new FRU has a warranty. If the customer is paying for a repair, they are paying for reliability. Use a harvested part only if the new FRU is unavailable or the customer has explicitly agreed to the risk.

FAQ

Can I use a T450s motherboard in a T450? Not without checking the HMM. The T450 and T450s are different chassis with different HMMs (SP40A26003 and SP40A26004). Do not assume compatibility.

How do I know if a donor board is good? Test it in a known-good chassis. Check for POST, backlight, and charging behavior. If it does not POST, it is not a good donor board.

Is it worth harvesting RAM and SSDs? Usually not. These are cheap and new ones are more reliable. Harvest them only if they come with a board you are already pulling.

What tools do I need for a T450 teardown? iFixit lists a Phillips #00 screwdriver, a spudger, and a plastic opening tool as the common tools for the platform.

Where do I get the T450 HMM? From Lenovo’s support site. The document number is SP40A26003. The T450s HMM is SP40A26004.