No Picture (Tuner_Cvbs) - Samsung 2033HD Service Manual

4. Troubleshooting

4-5. No Picture (Tuner_CVBS)

Symptom The LED power turns on but the screen is blank when the RF cable is connected.
-
Even though the LED power turns on, the screen is blank when connecting the RF cable.
-
Check the RF cable connections.
Major -
checkpoints
Check whether the LVDS cable is connected correctly to the panel.
-
Check whether the lamp connector of the panel is connected correctly to the IP board.
-
Diagnostics
Caution Make sure to disconnect the power before working on the IP board.
4-10
RA4002
RA4003
Power Indicator is off.
Lamp on, no picure.
Yes
④ Does the signal appear at
R5899?
Yes
④ Does the signal appear at #9
of TU5003?
Yes
⑤ Does the digital data appear
at R5055,R5056?
Yes
Check a LVDS cable?
Replacea lcd panel?
IC4010
RA4004,RA4005
Main Board Front
No
No
No
No
No
TU5003
R5899
Connect the RF cable and
check RF signal.
Check the Tuner Vcc 5V.
Change a main PBA.
Change a main PCB ass'y.
Check a IC4010.
Change a main PCB ass'y.
Please, Call to Samsung Co. LTD.