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LC-22GA3H/M/X
No sound
Is there the audio output in any input mode (TV, AV and J2401 thru pins (2) and (4) of IC2401. Check the following. COMPONENT)? NO 3 No audio output AV 2 input ... Check Is there the audio output speakers? 1 Go to "No Audio from Speakers". 4 No audio output from COMPONENT 3 Release the mute mode. input ... Check J3406 thru pins (47) and
NO 2 No audio output from AV 1 input ... Check
Is connected correctly? J2403 thru pins (9) and (11) of IC2401. 2 Connect the monitor output correctly.
speakers No sound from monitor output Check the following. 1 No audio output from TV ... Check the peripheral circuits of Q3204 Q3205 and TU3402.
3 Is the mute mode released?
YES YES (48) of IC3201. NO Is there the audio signal output at pins (38)(Rch) and
Check the peripheral circuits of IC3201. (37)(Lch) of IC3201?
YES
2 Is sound volume loud enough? Check the peripheral circuits of IC2001. Is pin (43) of IC2001 "L"?
Recheck the following. Check the following. 1 Is the monitor output in AV3 IN/OUT setting "Audio NO 1 Set the monitor output to "Audio fixed". fixed"? 2 Increase the sound volume. NO 3 Release the mute mode. 3 Is the mute mode released? 4 Unplug the headphones. 4 Are the headphones unplugged? YES Check pin (43) of IC2001 thru Q3406. Check the following. YES Is signal from the Q3406 collector "H"?
YES NO
NO +8V system ...Check the peripheral circuits of Is the power supply voltage at each circuit normal?
+5V system ...Check B5V1A line DC-DC pins (4) (Lch) and (2) (Rch) of J2404. Pins (11), (12), (13), (65) and (66) of IC3201 Approx.+5V conversion circuit output which consists of IC702, Q713, L703, YES etc. thru each +5V input pin of IC3201. Q3709 pin (39) IC3201. Pin (39) of IC3201 Approx.+8V Check pins (38)(Rch) and (37)(Lch) of IC3201 thru
TROUBLE SHOOTING TABLE (Continued)
24
Check (29) and (30) of IC2001 thru pins (2) and (3) of IC3201.
Is there the control signal input at each pin of IC3201? NO Pin (2) of IC3201 SCL1 Pin (3) of IC3201 SDA1
YES NO
Are the oscillation waves from pins (71) and (72) of Check the peripheral circuits of X3201. IC3201 normal?
YES NO
Is there the audio signal output at pins (27)(Rch) and Check the peripheral circuits of IC3201. (28)(Lch) of IC3201?
YES
Check pins (27)(Rch) and (28)(Lch) of IC3201 thru pins (7)(Rch) (1)(Lch) of IC3301, and the peripheral circuits of IC3301 and IC4405.
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