6 Troubleshooting
SyncMaster 320TFT/520TFT 6-5
6-6 No Sound
Check IC804, IC803, VR841 and
related circuit.
Check Pins 1 and 2 of CN806 and
related circuits.
Does the DC 5 V appear at Pin
5 of CN806, Pin 4 of IC803?
Does the sound input signal
appear at Pins 6 and 11 of IC803?
Yes
No
Yes
No
Check IC803 and related circuits.
Do the sound signals appear at
Pins 3 and 14 of IC803?
Yes
No
Check CN813, ZD803, R821, R822,
C815 on the Audio PCB.
Check CN814, CN815 outputs.
Does the DC 2.5 V bias appear at
Pin 16 of IC503?
Yes
No
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