No Display/-Backlight/Poor Picture Quality - Motorola MotoRAZR maxx V6 Manual

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Title: Troubleshooting-Guide MotoRAZR maxx V6

No display/-backlight/poor picture quality

Make sure that the problem is not located in the flip assembly, by testing PCB with a good
one and do a visual check of J2300.
The following supply voltages for the flip assembly should be present:
- B+
- VCAM
- VGPU_CORE_1_5V
- VLVIO_1_8V
- VHVIO_2_775V
The voltages can be ok without a flip connected, but can break down, if a flip is plugged in,
although the flip is ok! Additionally check the clock signal:
- APPS_CLK
only present the first seconds after power on!
If ok check:
- Filters FL2300, FL2301, FL2302, FL2303,
You can check the function of these parts by using an Ohm Meter to check the resistance to
GND for verification, which line is affected. By using MotoPCB, it can be tracked which filter
the signal passes until it reaches the ARGON.
If all of these are ok, it should most likely be a problem with the ARGON
an authorized level 4 service center.
We have seen some phones with the symptom: After a few seconds after turn on the display
seems to loose synchronization as shown on Figure 19. In most cases this issue was caused
by a skewed E2310. In some cases the PCB was damaged because of lifted pads. It seems
to be damaged by a poor disassembly process.
Repair Support Information
at E2310 (should be 26Mhz)
Figure 21
Doc. No:
Version:
Date:
Page:
FL2304
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