When Playing Disc, No Audio Output (In Vcr Board) - LG RCT689H Service Manual

VDR ELECTRICAL TROUBLESHOOTING GUIDE

4. WHEN PLAYING DISC, NO AUDIO OUTPUT (IN VCR BOARD)

Check Q904~Q907,
Q911,Q912,Q915,Q916
When playing disc, no audio
output (In vcr board)
IC402
Pins14, 15 (Audio_
out R/L) : Is there a
Signal?
IC402
Pins1, 16(Z_mute
NO
"H): IC501 Pin58(A_mute
"H"): IC501 Pin56
(D_mute 'H):
IC802 Pin1,7:
Is there a Signal?
L905, L906 :
Is there a Signal?
Check Cable connection
& TV Audio mute
Check IC1101
AR1105 (AO_DO,
AO_MCLK, AO_SCLK,
AO_FSYNC)
:
Check PMI01, PVM02
PMI01 : Pins22, 23, 24, 26
PVM02 : Pins25, 27, 28, 29
NO
YES
YES
NO
YES
YES
NO
.
YES
NO
3-74
Check
IC402 Pins2~4
(SPI) : Pins5~8(I2S) :
Pin10(reset) :
Pin7, 8(I 2 C):
YES
Check IC402 Pin11 (Vcc)
YES
Replace IC402
Check IC802 Pin2,6
Check IC802 Pin8 Power and
Other Circuit.
IC1101 Defect
Replace PMI01, PVM02
NO