Samsung SyncMaster 570B TFT Service Manual page 14

4-3 No Video of Alternate Vertical Line (CN15MSS/MOS)
One or more even or odd vertical lines do not display.
Does the waveform appear
7
at Pin 10 or Pin 2 of CN201?
Yes
Replace LCD panel.
4-4 No OSD (CN15MSS/MOS)
There is video but no OSD.
While pushing a front control
button does any pulse appear
8
at Pin 72,73 and 80,81
and 90,92 of IC203?
Yes
Replace IC251.
SyncMaster 570B TFT / 580B TFT
No
Replace IC251 and IC252
or check its related circuit.
9
No
Do sync signals appear at Pins 203,
204 and 207 of IC203?
Replace IC203 or check its
related circuit.
Replace IC133 or check
its related circuit.
10 11
No
Yes
4 Troubleshooting
WAVEFORMS
7 cn201 #20
CH1 RMS= 1.18V
WAVEFORMS
8 IC203 #72,73,80,81,90,92
CH1 RMS= 2.2V
9 IC203 #203
CH1 RMS= 1.7V
10 IC203 #207
CH1 RMS= 3.6V
11 IC203 #204
CH1 RMS= 3.6V
4-3