No Video - Samsung SyncMaster CSH7839L Service Manual

7 Troubleshooting

7-1-16 No Video

Check signal cable and connection.
IC01 Pins 2, 6 and 11 inputs
17
are right?
Yes
IC01 Pins 29, 32 and 35
18
outputs are right?
Yes
IC02 Pins 4, 6 and 14 outputs
19
are right?
Yes
Cathode DC levels are right?
No
G2 voltage is right?
Yes
Change CRT.
Done.
7-10
No
Check some parts around QR01,
QR02, QG01, QG02, QB01 and QB02.
No
2
Check I C bus and +12 V line.
No
Check +12 V line.
Check and replace IC02.
No
Check +220 V line.
Check and replace Q108 and IC06.
No
Check G2 wire, CRT Socket board,
and FBT.
WAVEFORMS
12.40 V (IC501, #9, 10)
17
CH1 P-P = 12.40 V CH1 RMS = 5.840 V
42.8 V (T551, #7)
18
CH1 P-P = 42.8 V CH1 RMS = 13.78 V
580 V (T551, #1)
19
CH1 P-P = 580 V CH1 RMS = 278.2 V
CSH7839L/CSH9839L