Samsung GR15MS Troubleshooting

SyncMaster 150T 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 12V appear at

DC jack connected to CN102?

Check DC Adaptor.

Yes

No

Does proper DC 5V appear at

output Pin of IC100?

Check IC104.

Check Q101, Q102 and Q103.

Yes

No

Does proper 5V-signal

appear at Pin 42 of IC701

(SW-REG-EN)?

Check IC701 and related circuit.

(CN100, Function Key)

Yes

No

4 Troubleshooting

4-2 SyncMaster 150T

4-2 No Video [Analog]

Check TFT-LCD panel and inventer.

Check signal cable connection.

No

Does the digital video signal appear at the

Pin 48, 45, 42, 39, 38 of IC600?

Is the Pin 1, 19 of IC701 High?

1

3 4

5

Yes

No

2

Check IC701 and related circuit.

Does the input signal appear at the

Pin 27, 28, 30, 31 and 32 of IC600?

(DHS, DVS, DEN, DCLK, LVDS-EN)

Does the analog video signal appear at

R218, R220, R222?

(RED, GREEN, BLUE)

Does the sync signal appear at the output

Pin 14, 18 of IC706? (HSYNC_IN, VSYNC_IN)

Does the input signal appear at the Pin

Pin 88, 89, 90 and 94 of IC205?

(ADC-EN,MCU-CLAMP, M_HSYNC, HSYNC_PLL)

During Power on-off, does the input signal appear

at the Pin 39, 42 of IC 205? (SDA, SCL)

Do the clock and sync signal appear at Pin 84, 80 ofIC205?

(AD_CLK, AD_HSYNC) and does the digital video signal appear

at AD_RED (7:0), AD_GRN (7:0),and AD_BLUE (7:0)?

During Power on-off, does the signal appear at the

Pin 63, 64, 65, 66 of IC501?

Replace IC501 and check related circuit.

6

OK

Yes

14

15

Yes

Yes

17

18 19

16

Yes

Yes

21

20

Yes

Check IC600 and related circuit.

Yes

Check PC and related circuit.

No

Check IC706 and related circuit.

No

Check the related circuit for these parts.

No

Check IC701 and related circuit.

No

Related IC205.

No

Check IC710 and related circuit.

No

No

7

8 9

10

11

12

13