4-13
4. Troubleshooting
4-1-7. No Sound
Symptom Audio is normal but no picture is displayed on the screen.-
Major
checkpoints
Check the RF Source
Check the SEMT01(MT8226)
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
-
-
Diagnostics
1
23
No
Check a connection harness and
headphone jack./Side AV
Check Sound Processor
IC2102 (MT8291)
No
Picture is display, no sound.
Check a B12V Line.
Change a main PCB ass’y.
No
Does the signal appear at pin #6, #4, #5,
#12(MCLK, BCLK, LRCLK, DATA)
of IC2102?
Check the DC 12V
BD2107 of IC2104?
Please, Contact Tech support.
No
Does the signal appear at
Pin #47 or 48, #53 or
54(CH1_L, R Sound) And Pin
#36 or 37, #30 or 31
(CH2_L, R Sound) of IC2104?
Replace the speaker ass’y?
Yes
Connect a sound cable.
control a volume.
Yes
1
Yes
3
Yes
2
Caution Make sure to disconnect the power before working on the IP board.
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