LG V9120W Service Manual page 28

(C)
Hi-Fi REC.
It can't be recorded Hi-Fi Audio
signal.
Check Vcc of IC801.(Pins34, 40)
Check IC801 Pin42(Data), Pin43(CLOCK).
Do Audio signals appear at IC801
Pins16, 17?
Do FM Audio signals appear at IC801
Pin36?
Check the Contact Point of Drum
Connector if good then Replace the Drum.
YES
YES
YES
YES
YES
YES
NO
Check Power 5V, 12V.
NO
Check ports of µ-COM.
(IC501 pins 17, 18)
NO
Check Audio input signal of IC801
Pins2, 3(TU.A.), 4, 5(DVD.A.),
6, 7(AVI.A.), 10, 11(AV2.A.).
NO
Replace IC801.
3-17