Service manual

4-23

4. Troubleshooting

4-1-9. No Sound

Symptom Video is normal but there is no sound.. T

Major

checkpoints

When the speaker connectors are disconnected or damaged. T

When the sound processing part of the Main Board is not functioning. T

Speaker defect.. T

Diagnostics

Check the source and

check the connection of sound cable?

(Comp/AV/PC/DVI to HDMI)

Does the sound data appear at

TP - COMP_SL_IN, COMP_SR_IN (COMP)

TP - AV_SL_IN, AV_SR_IN (AV)

TP - PC_SL_IN, PC_SR_IN (PC/DVI) ?

Does the DC B12VS

appear at TP - B12VS1?

Replace speaker.

Does the sound data appear at

TP - SPK_ L-, SPK_L+, SPK_R-, SPK_R+?

Input the sound source properly.

Check CN802, CN801, CN901.

Change the Main Assy.

Please, Contact Tech support.

Check I102 (SX1).

Check IC1301 (Sound AMP).

Yes

Caution Make sure to disconnect the power before working on the IP board.