Samsung DV17MSSAN, DV17MSSAS Troubleshooting
SyncMaster 770TFT 5-1
5 Troubleshooting
Notes: 1. Before troubleshooting, setup the PC’s display as below.
• Resolution: 1280 x 1024
• H-frequency: 64 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: Stand PCB, Main PCB
• 14V develop but no screen: Main PCB
• 14V does not develop: Main PCB
4. If you push and hold the EXIT button for more than 5 seconds, the monitor automatically turns back
to the factory preset.
5-1 No Power
Does proper DC 14 V appear at
DC jack connected to CN101?
Check Power Adaptor.
Yes
No
Does proper DC 5 V appear at
Pin 4 of IC101?
Check IC101 and related circuit.
Check Q103, Q105 and Q106.
Yes
No
Does proper 5 V - signal appear at
Pin 42 of IC501 (SW_REG_EN)?
Check IC501 and related circuit.
(CN102, Function Key)
Yes
No
5 Troubleshooting
5-2 No Video
Check signal cable and connection.
Does the digital video signal appear
at the Pin 34, 35, 39, 40, 42, 43, 45 and 46 of IC601?
15 16 17 18
Yes
No
Is the output of Pin 1, 17 of IC501 High?
No
Check IC501 and related circuit.
Does the input signal appear at Pin of 76, 77, 78,
80 of IC601 (LDTGB, LVSYNCB, LHSYNCB, LCKBB)
1 2 3 4
Yes
Does the analog video signal appear at R211,
R212, R215? (BLUE, GREEN, RED)
(IC201)
Yes
Does the sync signal appear
at the output of Pin 14 of IC201and Pin 3 of IC 206 ?
5 6
(V-SYNC, H*V SYNC)
Yes
Yes
Check TFT-LCD panel and Inverter.
No
Check IC601 and related circuit
No
Check IC201 and related cirmit.
No
Check IC201, IC206 and related
circuit.
Does the input signal appear at the Pins 40, 41
of IC 300?
7 8
( PLL H*V, MX-PDEN)
No
Check the related circuit for these
ports
Yes
During power on-off, does the input signal
appear at the Pin 29,30 of IC300?
No
Check IC501 and related circuit.
(AD-SDA, AD-SCL)
Yes
Do the clok and sync signal appear at Pin 115,
117 of IC 300? (DCLKAB, MX_HSYNC) and
9 10
does the digital video signal appear at thr output
No
Check IC 300 and related circuit.
port PDA, PDB)?
Yes
During power on-off dose the input signal
appear at the R 407 and R 408 ?
No
Check IC501 and related circuit.
(MX-SDA, MX-SCL)
5-2 SyncMaster 770TFT
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