Which JCID tool does what
JCID sells two programmers that repair shops actually use day to day. Both run the same JC software and use the same adaptor boards, so the workflow below applies to either.
| JCID V1SE | JCID V1S Pro | |
|---|---|---|
| Form | Small box, connects to a phone app or PC; Wi-Fi version available | Standalone unit with 4-inch touch screen, Android-based |
| Battery data | Read, write, one-click repair, cycle reset | Same |
| Screen True Tone | Read and write, original and aftermarket panels | Same, plus display and touch test for iPhone and Android panels |
| Face ID dot projector | With dot projector adaptor, X to 15 Pro Max | Same |
| Rear camera, vibrator, fingerprint, earpiece | With the matching adaptors | Same |
| NAND read and write | No | Yes, BGA60, BGA70, BGA110, BGA315 sockets |
| Who it suits | Screen and battery shops | Shops doing board-level work too |
If you only replace screens and batteries, the V1SE with the screen and battery boards is enough. Both are stocked under Programmers and Testers.
Before the first job
- Update the firmware. JCID adds new models through updates, and an outdated unit will not recognise a recent battery flex.
- Label the adaptor boards. The battery board, screen board and dot projector board look similar; a wrong board does not damage anything but costs time.
- Keep a USB power source that gives a steady 5 V. Unstable power during a write is the most common cause of a corrupted chip.
Battery: reading, repairing, writing
The battery board has a row of connectors for different flex generations. Match the connector to the model, then follow this order.
- Read the original battery. Connect the old battery’s flex to the board, choose Battery, Read. The tool shows serial number, design capacity, current capacity, cycle count and temperature. Save the data as a file; the phone’s original serial is what makes the pop-up disappear later.
- Decide what to write. Three cases:
- New battery with a JCID-compatible chip (our Pre-Programmed grade): connect it, Read, then Write the saved original data onto it. Health will show and the phone sees the serial it expects.
- Cell-only battery plus tag-on flex: fit the tag-on flex to the cell, connect the flex to the board, Write the original data. The tag-on flex is the chip; the cell is only chemistry.
- Original battery that shows wrong health or a service message: use One-click repair. The tool corrects the capacity figure to the measured value and sets cycle count to zero. This fixes a confused gauge, not a worn cell.
- Verify. Read the battery again and compare serial and capacity. Only then fit it in the phone.
On iPhone 11 to 15 Pro Max the pairing check is on the battery flex, which is why tag-on flexes exist for exactly those models. On iPhone 16 and newer the data layout changed; check the JCID model list before promising a customer the result.
Screen: True Tone and light sensor
- Connect the old screen’s display flex to the screen board. Read. The tool identifies the panel model and shows the True Tone block.
- Connect the new screen, Write. If the old screen is dead, choose the model from the list and let the tool write a default profile.
- For iPhone 13 and newer, write the light sensor data as well, otherwise auto-brightness stays off.
- Fit the screen, boot the phone, confirm the True Tone toggle. Background in our True Tone guide.
Refurbished Original and Soft OLED panels from our iPhone parts range have writable chips; the listing says so.
Dot projector and Face ID
The dot projector board lets you read the projector’s data from a damaged flex and write it to a replacement dot projector flex, so the Face ID module keeps its pairing. This is microsoldering work: the projector itself is swapped under a microscope. For most screen and battery shops the realistic use is diagnosis, reading whether the projector responds at all before quoting the customer. More in camera replacement and Face ID notes.
Common errors and what they mean
| Message | Usual cause | Fix |
|---|---|---|
| Device not detected | Flex in the wrong connector or inserted backwards | Check the pin side; reseat |
| Read failed | Dead chip on the old flex, or torn flex | Write from model default instead |
| Write failed, chip locked | Panel with read-only chip | Use a programmable panel; no workaround |
| Model mismatch | Saved data from a different model | Reload the correct file |
| Health shows but pop-up remains | Serial written but phone not restarted, or iOS cached the state | Restart twice; wait for the five-day notification cycle |
Safety note
Never connect a battery to the programmer while it is also connected to a phone. Keep the battery below 30 percent charge if you must spot-weld a tag-on flex to a bare cell, and do it away from the bench where screens are stored. Lithium cells vent fast when a welding electrode slips, and a vented cell near OCA solvent is a fire. Keep a fireproof pouch within reach.
FAQ
Can the JCID programmer remove the Unknown Part note?
Not by itself. Writing the original serial to a tag-on flex stops the battery pop-up on many models and makes health visible, but the Parts and Service History line depends on the pairing check; see the Unknown Part guide.
Do I need a PC for the V1SE?
No. It works with the JCID app on a phone and has a Wi-Fi variant. The V1S Pro is fully standalone.
Which batteries work with the tag-on flex?
Any bare cell of the right size for the model. We sell cells labelled Cell Only (No Flex) for exactly this use.
Can I reset cycles on an original battery and sell it as new?
You can reset the number; it does not make the cell new. Describe such batteries honestly as reset pulls.