3-3
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Only for training and service purposes
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LCD ELECTRICAL TROUBLESHOOTING GUIDE
YES
Display condition?
LED Backlight/Driver abnormal
NO
Appear shadow in
black backgroud
Power supply normal?
Check main B/D and repairing
YES
NO
+5V normal?
IC(U9) Check and Replace
YES
YES
NO
7.5V, 15V, -10V normal?
D16, D17, D18, D19 Check and Replace
NO
RGB signal output?
MTK1389P (Pin:184, 185, 187)
Check and Replace
YES
NO
IC(U8) Check and Replace
VCOM signal?
NO