Samsung LN32B550K1F Service Manual page 172

4. Troubleshooting
4-1-3. No Video (Analog PC signal)
Symptom Audio is normal but no picture is displayed on the screen.
-
Check the PC source
-
Major
Check the Arsenal, Check the Chelsea.
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
1
Diagnostics
2
Caution Make sure to disconnect the power before working on the IP board.
4-4
Power indicator LED is off.
Lamp(Backlight) on, no video
Yes
Check the PC source and
check the connection of D-SUB
Yes
Does the signal appear at
TP - PCR, PCG, PCB, PCH, PCV
(R, G, B, H, V) of IC201?
Yes
Does the digital data appear at
Pin #19,20,34,35 (LVDS Data clk)
of LVDS connector?
Yes
Check the LVDS cable?
Check the T-Con B'd?
Replace the LCD panel?
No
in the 'Stand-by mode' or
'DPMS mode'
Input the analog
No
PC signal properly.
Check CN903, PC cable.
Change the Main Assy
No
550 32" : BN94-02518A
550 37" : BN94-02518B
550 40" : BN94-02518A
550 46" : BN94-02518D
550 52" : BN94-02518E
540 40" : BN94-02510A
540 46" : BN94-02510B
540 52" : BN94-02510C
Check IC201 (Saturn4)
No Change the Main Assy
550 32" : BN94-02518A
550 37" : BN94-02518B
550 40" : BN94-02518A
550 46" : BN94-02518D
550 52" : BN94-02518E
540 40" : BN94-02510A
540 46" : BN94-02510B
540 52" : BN94-02510C
No
Please, Contact Tech support.
Check a set