LG 22LS2100 (CHASSIS:LD93Q / LP93Q) Service Manual ▷ View online
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6. Abnormal screen (RGB PC)-Main PCBA
Put into RGB
cable completely?
Abnormal screen (RGB PC)
YES
NO
NO
insult RGB cable tight
1
Change IC600
WAVEFORMS
Is Input signal timing
and format in spec?
Change Timing according to
product spec, Or change format to RGB
2
Is waveform at R628,
R630, R634
3
Check Line between P302 and IC600
is open or short, Another is
Change RGB cable
NO
YES
YES
3
R630(G)
R634(R)
R628(B)
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7. Abnormal screen (HDMI)-Main PCBA
Put into RGB
cable completely?
Abnormal screen (RGB PC)
YES
NO
NO
insult RGB cable tight
1
Change IC600
WAVEFORMS
Is Input signal timing
and format in spec?
Change Timing according to
product spec, Or change format to RGB
2
Is waveform at R628,
R630, R634
3
Check Line between P302 and IC600
is open or short, Another is
Change RGB cable
NO
YES
YES
3
R630(G)
R634(R)
R628(B)
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8. No sound (all source )-Main PCBA
Does wire connect P501 with speaker?
NO sound (All source)
YES
NO
YES
NO
YES
Connect wire between P501 and speaker.
1
Change speaker and wire
Is 19.4V at 2,34,40,44pin
of IC502 ?
If 8V is not plus at L703, check
of JK700 is open.
If is not Check Line between L703
and IC502 is open or short.
.Another is change IC502
2
NO
Is 3.3V at 13,27pin of IC502?
If 3V is not plus 13,27pin of IC502,
check It is over 3V at L501,L504,
if it is not, Check Line between L712
and IC502 is open or short.
Another is change IC701,IC502
NO
3
4
YES
Is I2C waveform at
23,24pin of IC502?
Check Line between IC502 and IC600
is open or short, Another is change
IC502 or IC600.
NO
5
Is I2S waveform at
R510,R511,R512,R513?
6
Check Line between IC501 and IC600
is open or short, Another is change
IC502 or IC600.
YES
Is there any waveform P501?
Check Line between IC502 and P501
is open or short. And then check resistance
of speaker is under 4ohm.
Another is change IC502
NO
4
23pin of IC502
24pin of IC502
5
R513(SDO)
R511(WS)
R512(SCK)
5
R510(MCLK)
6
1pin of P501(Audio out)
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9. Abnormal sound (TV)-Main PCBA
Put into RF cable completely?
Abnormal sound (TV)
YES
NO
NO
insult RF cable tight and then
Cable nut screw tight.
1
Change Main PCBA
WAVEFORMS
Is 5V at 5pin of TU401?
If 4.9V is not at plus pin of L706, check
It is over 3V at 2pin of IC706,
if it is not, Check Line between IC706
and IC600 is open or short.
Another is change IC706
2
Is I2C waveform
At 6,7pin of TU401?
3
Check Line between TU401 and IC600
is open or short, Another is change
IC600 or TU401
4
Is IF waveform at 67
,68 pin of IC600?
Check Line between TU401 and IC600
is open or short, Another is change
IC600 or TU401
NO
NO
3
7Pin of TU401 (SCL)
6Pin of TU401 (SDA)
4
67,68 pin of IC604
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