Samsung SyncMaster 570BTFT Service Manual page 17

4 Troubleshooting
4-3 No Video of Alternate Vertical Line
One or more even or odd vertical lines do not display.
Does the waveform appear
6
at Pin 20 of CN301?
Yes
Replace LCD panel.
4-4 No OSD
There is video but no OSD.
While pushing a front control
15 button does any pulse appear
at Pin 12 of IC307?
Yes
Replace IC305.
4-5 User Controls Don't Work
Does the DC level change at
Pins 11 and 12 of IC401 when you
push the front panel button?
Yes
Go to 4-4 No OSD Display.
4-4
No
Replace IC311 or check its
related circuit.
No
Do sync signals appear at Pins 5
16
and 10 of IC307?
17
Yes
Replace IC307 or check its
related circuit.
Replace IC305.
No
Check the buttons.
(SW861 ~ SW866)
WAVEFORMS
6 CN301 #20
CH1 RMS = 1.18 V
WAVEFORMS
15 IC307 #12
No
CH1 RMS = 2.2 V
16 IC307 #5
CH1 RMS = 1.7 V
17 IC307 #10
CH1 RMS = 4.3 V
SyncMaster 570BTFT/580BTFT