3-3
LCD ELECTRICAL TROUBLESHOOTING GUIDE
Fuse normal?
Fuse Replace
YES
YES
NO
Display condition?
Inverter abnormal
NO
Appear shadow form
interference in black background
IC(U1) normal operate
IC(U1) Check and Replace
YES
NO
+5V normal?
IC(U901) Check and Replace
YES
YES
NO
7.5V, 15V, -10V normal?
D907, D901, D902
NO
Main B/D on located
RGB signal output?
Check and Replace
MPEG1389. (Pin : 184, 185, 187)
YES
NO
IC(U902) and Replace
VCOM signal? (4.5V)
NO
Summary of Contents for DP270B
Page 15: ...3 6 MEMO ...
Page 17: ...3 9 3 10 PRINTED CIRCUIT DIAGRAM TOP VIEW BOTTOM VIEW MEMO ...
Page 34: ...3 27 2 WIRING CONNECTION DIAGRAM 2 MAIN PCB KEY PCB MAIN PCB Key PCB ...
Page 51: ...3 55 3 56 1 MAIN P C BOARD TOP VIEW PRINTED CIRCUIT DIAGRAMS ...