Samsung SyncMaster 570B TFT Service Manual page 15

4 Troubleshooting
4-5 User Controls Don't Work (CN15MSS/MOS)
Does the DC level change at
Pins 35 and 36 of IC311 when you
push the front panel button?
Yes
Go to 4-4 No OSD Display.
4-6 No Sound (CN 15MSS/MOS)
Does the DC 12V appear at Pin
2 of IC801, Pin 6 of CN801?
Yes
Does the sound input signal
appear at Pins 6 and 7 of IC801?
Yes
Does the sound signals appear at
Pins 1 and 3 of IC801?
Yes
Check CN805, CN806 outputs.
4-4
No
Check the buttons.
(SW801~SW808)
No
Check IC801, VR803 and related
circuit.
No
Check Pins 1 and 3 of CN801 and
related circuits.
No
Check IC801 related circuits.
SyncMaster 570B TFT / 580B TFT