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Display blackout after a flicker, or just no display while ADB device can be

recognized after booting up.

1. Check

CON1602

2. Swap the testing panel and also check the connector on the panel FPC.

3. Check

PU8901, PC8904, PC8905

SMT issues.

4. If nothing found using X-ray, demount shielding to check

PC8905

for defects on IC or any short circuits .

5. Probe the power net

compare the impedance with normal PCB

6. Probe the power net

VREG_WLED

[Check the SMT to see if any solder skips]

No display-BMMI

for any short circuits, shift, or solder skips.

VDISP_P_OUT、 VDISP_M_OUT、 VREG_WLED

VDISP_P_OUT(+4.6V)、 VDISP_M_OUT (-2.5V) 、

(+6.1V). Change

by X-ray and search for any short circuits, or

PU8901

if any power with a different voltage.

PU8901, PC8904,

and