Samsung DV18MSTAS, DV18MSTAN, DV18MSPAN Troubleshooting

SyncMaster 800TFT 5-1

5 Troubleshooting

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

• Resolution: 1280 x 1024

• H-frequency: 64 kHz

• V-frequency: 60 Hz

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

3. Check the following circuits.

• No raster appears: Stand PCB, Main PCB

• 12V develop but no screen: Main PCB

• 12V does not develop: Main PCB

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

5-1 No Power

Does proper DC 12 V appear at

DC jack connected to CN101?

Check Power Adaptor.

Yes

Does proper DC 5 V appear at

Pin 4 of IC101?

Check IC101 and related circuit.

Check Q103, Q105 and Q106.

Yes

Does proper 5 V - signal appear at

Pin 42 of IC501 (SW_REG_EN)?

Check IC501 and related circuit.

(CN102, Function Key)

Yes

5 Troubleshooting

5-2 SyncMaster 800TFT

5-2 No Video

Check signal cable and connection.

Check TFT-LCD panel and Inverter.

Check IC201 and related circuit.

Does the outpus signal appear at RA403 and R411 of IC406? (LDTGB, LVSYNCB, LHSYNCB, LCKBB)

Is the output of Pins 1, 17 of IC501 High ?

Yes

Does the analog video signal appear at R211,

R212, R215? (BLUE, GREEN, RED)

(IC201)

Yes

Check IC201, IC206 and related

circuit.

Does the sync signal appear

at the output of Pin 14 of IC201and Pin 3 of IC 206 ?

(V-SYNC, H*V SYNC)

Yes

Check the related circuit for these

ports.

Check IC501 and related circuit.

Check IC 300 and related circuit.

Does the input signal appear at the Pins 40, 41

of IC 300?

(PLL H*V MX-PDEN)

Yes

During power on-off does the input signal

appear at the Pin 29,30 of IC300?

(AD-SDA, AD-SCL)

Do the clock and sync signal appear at Pin 115, 117 of IC 300?

(DCLKAB, MX_HSYNC) and does the digital video

signal appear at thr output port PDA, PDB)?

Yes

During power on-off dose the input signal

appear at the R 407 and R 408 ?

(MX-SDA, MX-SCL)

Yes

7 8

9 10

Check IC 406 and related circuit.

Yes

1 2 3 4

5 6

Check IC501 and related circuit

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