Samsung SyncMaster 800TFT Service Manual page 17

5 Troubleshooting
5-2 No Video
Check signal cable and connection.
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 ?
No
Check IC501 and related circuit
Does the analog video signal appear at R211,
R212, R215? (BLUE, GREEN, RED)
at the output of Pin 14 of IC201and Pin 3 of IC 206 ?
Does the input signal appear at the Pins 40, 41
During power on-off does the input signal
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)?
During power on-off dose the input signal
Check IC 406 and related circuit.
5-2
1 2 3 4
Yes
No
(IC201)
Yes
Does the sync signal appear
(V-SYNC, H * V SYNC)
5 6
Yes
of IC 300?
7
(PLL H * V MX - PDEN)
Yes
appear at the Pin 29,30 of IC300?
(AD - SDA, AD - SCL)
Yes
9 10
Yes
appear at the R 407 and R 408 ?
(MX - SDA, MX - SCL)
Yes
8
Yes
Check TFT-LCD panel and Inverter.
No
Check IC201 and related circuit.
Check IC201, IC206 and related
No
circuit.
No
Check the related circuit for these
ports.
No
Check IC501 and related circuit.
No
Check IC 300 and related circuit.
No
Check IC501 and related circuit.
SyncMaster 800TFT