Samsung RN15PSSPN Troubleshooting

SyncMaster 570PTFT / 570P Plus TFT

4-1

4 Troubleshooting

Notes: 1. Before troubleshooting, setup the PC’s display as below.

• Resolution: 1024 x 768

• H-frequency: 48 kHz

• V-frequency: 60 Hz

2. If no picture appears, make sure the power cord is correctly connected.

3. Check the following circuits.

• No raster appears: Audio PCB, SMPS PCB, Main PCB

• 12V develop but no screen: Main PCB

• 12V does not develop: Audio PCB, SMPS PCB

4. If you push and hold the “EXIT” button for more than 5 seconds, the monitor automatically turns back
to the factory preset.

4-1 No Power

Does proper DC 12 V appear at

DC jack connected to CN102?

Check DC Adaptor.

Yes

No

Does proper DC 5 V appear at

Pin 4 of IC104?

Check FT101 and IC104.

Check IC101 and IC103.

Yes

No

4 Troubleshooting

4-2

SyncMaster 570PTFT / 570P Plus TFT

4-2 No Video

Replace IC301.

Power indicator is green

Replace IC501 or check its

related circuit.

Replace IC146.

Replace IC141

or X141.

Check IC102

and IC541.

No

Does the clock pulse

appear at output of

CFT301?

Does the clock pulse appear

at Pin 5 of IC146?

Does the pulse appear at Pin 4

of IC141?

1 7

No

Does the sync pulses appear at

Pins 27 and 28 of IC501?

Does the sync and clock

pulse appear at Pins 115

and 117 of IC151?

Replace IC301 or check its

related circuit.

3 4 8 9

Replace IC501 or check its

related circuit.

Replace LCD Panel

No

Do the sync pulses appear at

FT509?

Do the sync pulses appear at Pins

30, 31 and 32 of IC501?

5

12 13 14

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

No

No

No

Is RGB port selected?

Does the sync and clock pulse

appear at Pins 21 and 26 of

IC211?

10 11

Yes

Check IC161 and IC541

or Replace IC211.

No

No

Yes