2011-000002 datasheet(16/43 Pages) SAMSUNG

16 / 43 page

5 Troubleshooting

5-2

SyncMaster 770TFT

5-2 No Video

Check signal cable and connection.

Check IC201 and related cirmit.

Does the input signal appear at Pin of 76, 77, 78,

80 of IC601 (LDTGB, LVSYNCB, LHSYNCB, LCKBB)

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 clok 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

Does the digital video signal appear

at the Pin 34, 35, 39, 40, 42, 43, 45 and 46 of IC601?

Yes

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

Check TFT-LCD panel and Inverter.

Yes

Check IC601 and related circuit

Check IC501 and related circuit.

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