Troubleshooting - Samsung SyncMaster 1000s Service Manual

7 Troubleshooting

7-1 Parts Level Board Repair Section
Notes: 1. If a picture does not appear, fully rotate the brightness and contrast controls clockwise and reinspect.
2. Check the following circuits.
• No raster appears: Power circuit, Horizontal output circuit, H/V control circuit, and H/V output circuit.
• High voltage develops but no raster appears: Video output circuits.
• High voltage does not develop: Horizontal output circuits.
7-1-1 No Power Supply
Check and replace FH601, D601.
Does power supply make chirping
noise?
No
Does the IC601 Pin 1
2
waveform correct?
Yes
Do OP602, IC604 and
D606 work normally?
Yes
Is the power board work well?
Yes
Verify voltages.
Done.
SyncMaster 1000s (CGP1607L)
Yes
Check and replace Q604, Q607, T601
and D634.
No
Check and replace IC601, OP602,
IC604 and D606.
No
Relace parts and verify voltages.
No
Replace power board.
WAVEFORMS
2 552 V (IC601, #1))
CH1 P-P = 552 V CH1 RMS = 323 V
7-1