LG GDR-8161B Service Manual page 51

No audio output
Audio-play is not started only by
setting Audio-CD.
Please connect interface-cable and
use CD-player software.
Play Audio-CD with CD-player
software.
LED blinking ?
YES
check waveform :
IC201(85)
IC201(86)
OK
PG402(2) : about 0V
NO
check waveform :
PG701(46)
PG701(43)
OK
check waveform :
PG402(6)
PG402(3)
OK
check waveform :
IC451(5)
IC451(3)
OK
IC451(8) : 5V
IC451(2) : about 0V
NO
check waveform :
IC451(7)
IC451(1)
OK
check waveform :
JK451(2)
JK451(3)
*
Check item
NO
• connection of Drive and PC
• IC201-- PG701
*) The play command is not received.
NG
• IC201
YES
• IC201(1) -- Q402 -- PG401(2) -- Q401
• IC201
NG
• IC201(85) -- PG701(46)
• IC201(86) -- PG701(43)
NG
• PG701(46) -- PG402(6)
• PG701(43) -- PG402(3)
• PG402(6) -- IC451(5)
NG
• PG402(3) -- IC451(3)
• RV451
• C451, C452
• R453, R454
NG
• IC451(8) -- R460 -- PG402(7) --
PG401(7) -- 5V power
YES
• IC451(2) -- PG402(2) -- PG401(2)
• R461, C459
NG
• IC451
• IC451(7) -- JK451(2)
• IC451(1) -- JK451(3)
NG
• C453, C454
• R455, R456
• C455, C456
• L451, L452
OK
• JK451
• connected Headphone
When the CD-player software using DAE play
mode, Line-out, Headphone-out and Digital-
audio-out is not enable
Note : When the circuit number is written, check parts and
soldering including a nearby circuit.
When two or more pin numbers are indicated by the
party, check signal-line including a nearby circuit.
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