LG V9120QW1M, Service Manual

Page: 27 / 116

3-16
3. Y/C CIRCUIT
(B) Hi-Fi Playback
YES
YES
YES
YES
PB mode
No Sound.
Check the Vcc of IC801
(Pins34, 40)
Check the Hi-Fi Selection switch.
(IC801 Pin41) and the Tape quality.
Is the RF Envelope at
IC801 Pin44 over 2Vp-p?
YES
Check IC801 Pin42(Data),
Pin43(Clock)
YES
Do Audio Signals appear at
IC801 Pin16(L-CH), 17(R-CH)?
YES
Do Audio Signals appear at
IC802 Pin10(L-CH), 16(R-CH)?
YES
YES YES
Do Audio Signals appear at
IC802 Pins11, 16?
Do Audio Signals appear at
JK902?
Check Power 5.0V, 12VT.
NO
Check IC501 Pin26
(A.H/SW)
NO
NO
Check the parts of µ-COM
(IC501 Pins17, 18)
NO
Check the Connection at
P3D01 Pins7, 9.
NO
Check the A.IN line of
IC802(C850, C852)
NO
Check the Vcc of IC802
Pin13.
Replace IC802.
Check the Jack(JK902)
NO
NO
Check Power.
NO