More actions
| Poco X3 Pro No Light After 2 SecondS Of Powering ON | |
|---|---|
| Device | Poco X3 Pro |
| Affects part(s) | Logic Board |
| Needs equipment | Soldering Iron, Hot Air Station, Microscope |
| Difficulty | ◉◉◉◉ Specialist |
| Type | Soldering, Teardown, BGA |
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Problem description
When you turn on the device you will see the "POCO" booting logo for the first 1-2 seconds and after that the screen goes black
Symptoms
- When the device is booted shows "POCO" logo and after 1-2 seconds screen goes blank
- Graphics are still hardly visible (with external source of light)
- Light section turns off
- Phone boots up normally
- High Diode value on the Display_CABC, the diode value on this should be ~ 0.610v
If you have all the symptoms mentioned above then proceed to the repair steps.
Solution
This problem occurs due to a missing CABC(pwm) line, this controls the brightness supplied to the display panel. Usually this track gets damaged from inside so the best way to repair it is to make a jumper from under the power ic to the display connector.
- Make sure the Diode Value on this pin is High or OL
- Remove the Power IC
- Take a jumper from under the pmic (exact pad shown in the picture) and make a jumper to the display connector (exact pad shown in the picture)
- Reinstall the power ic and test.