LG CM2520 Service Manual page 18

ELECTRICAL TROUBLESHOOTING GUIDE
+PVDD (20.5 V)
YES
C918, C916, C902,
C905, C917 normal?
YES
D913, D914
normal?
YES
IC908, PC901
normal?
YES
Is VCC (130V-340V) supplied to IC901 Pin1?
YES
Is VCC (9.5V-26V) supplied to IC901 Pin3?
NO
Replace C918, C916, C902, C905, C917.
NO
Replace D913, D914.
NO
Replace IC908, PC901.
NO
Replace ZD903, C923, Q907, D906, C909.
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