Advertisement
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
Advertisement
