How to Track Parts Inventory in a Repair Shop

Why parts counts drift

Parts counts rarely go wrong because of one big mistake. They drift a little every day: a part pulled for a test and never put back, a screen broken during install that nobody logged, a delivery shelved before anyone checked it, a return to the supplier that was boxed up and forgotten. Each one is small. After a month, your numbers no longer match the shelf, and the team stops trusting them.

The fix is not a better spreadsheet. It is a short routine everyone follows the same way, so every part has a clear trail: in, used, returned, or written off. If you want the bigger picture on naming parts and setting reorder points, read our guide to repair shop inventory management. This page focuses on the habits that keep those numbers right week after week.

1. Receive every delivery the same way

When a box arrives, do not shelve it straight away. Open it at one spot, with the order in front of you, and check each line:

• Right part, right model. A screen for the wrong variant looks almost identical. Check the model and color before it goes on the shelf.
• Right quantity. Count what arrived, not what the packing slip says.
• Quick test where you can. Plug in screens and batteries on a test device when it makes sense. A dead-on-arrival part found today is a simple return; found during a repair, it is a delay and an unhappy customer.

Only after that do you add the stock to your system and put the parts in their labeled bins. Partial deliveries stay open until the rest arrives, so you know what is still owed.

2. One bin, one label, one name

Every part should have a single home and a single name that matches your system exactly. If the label says one thing and the software says another, someone will grab the wrong part or count it in the wrong place. Keep similar parts physically apart, especially screens for neighboring models, and keep a clearly marked area for parts that are not sellable: defective, waiting on return, or salvaged from a donor device.

3. Tie every part to a ticket

This is the habit that matters most. When a tech pulls a part for a repair, it is deducted against that repair ticket at the moment it leaves the bin, not at the end of the day from memory. That way:

• Your count updates in real time, so the front counter knows what is actually available.
• You can see the true parts cost of each job.
• If a part fails later, you can trace which batch and which supplier it came from.

If a part is pulled for a test and goes back in the bin, put it back in the system too. If a test part ends up installed, it gets attached to that ticket like any other.

4. Log broken and defective parts right away

Parts get damaged during installs. Flex cables tear, glass cracks, a battery arrives swollen. When that happens, the tech moves the part to the defective area and logs it with a short reason: arrived faulty, damaged during install, or failed after install. Do not quietly swap in a new one and throw the old one away.

Two reasons this matters. First, parts that arrived faulty usually go back to the supplier for credit or replacement, and you cannot return what you threw away. Second, install damage is a training signal. If one model or one tech keeps breaking flex cables, you want to know.

5. Treat supplier returns as their own stock

Returns are where parts quietly disappear. Keep a simple list of everything waiting to go back: part, quantity, reason, date, and which order it came from. When the return ships, mark it shipped. When the credit or replacement comes back, close it out. Review the list every week. Anything sitting there for weeks is money you are not getting back.

6. Count a little, often

A full stock count once a year is painful and still leaves the rest of the year unchecked. Instead, count a small slice regularly:

• Fast movers weekly. Screens and batteries for the models you see most.
• Everything else monthly. Split slow movers into groups and count one group each week.
• Count blind. The person counting writes down what is in the bin before looking at what the system says.

When the count and the system disagree, do not just overwrite the number. Look at the tickets and the defective log first. Most gaps have an explanation: a part used but not logged, or a delivery added twice. Record the adjustment and the reason, so patterns show up over time.

7. Reorder from data, not from panic

Once parts are tied to tickets, you know how many of each part you actually use in a typical week. Set a reorder point for each stocked part based on that usage and on how long your supplier takes to deliver. Review those points every couple of months, because phone models come and go. Parts for older models that stopped selling should drop off the regular reorder list and be ordered only when a job needs them.

8. Know who can change the numbers

In a small shop everyone touches inventory, and that is fine. What helps is being clear about who can receive stock, who can adjust counts, and who reviews adjustments. Even a quick weekly look at all manual changes catches mistakes early and keeps everyone careful.

A simple weekly checklist

• All deliveries received, checked and added.
• Every part used this week attached to a ticket.
• Defective parts logged and in the defective area.
• Supplier return list reviewed; old items followed up.
• Fast movers counted, one group of slow movers counted.
• Adjustments reviewed with reasons.
• Reorder list checked against usage.

None of this needs fancy tools, but it is much easier when your tickets and your parts live in the same place. RepairAmigo is free repair shop software where parts are deducted against the ticket that used them, so your counts stay close to the shelf without extra paperwork.