No Video_Tuner - Cvbs - Samsung UN32D5500RF Service Manual

4. Troubleshooting

No Video_Tuner - CVBS

„
Symptom Audio is normal but no picture is displayed on the screen.
-
Check the Tuner CVBS source.
-
Major
Check the Tuner, Check the Chelsea.
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Main Ass'y
Speaker
Dose the promblem still exist self diagnosis ?
Diagnostics

Caution Make sure to disconnect the power before working on the IP board.
4-10
14p cable
LVDS cable
T-con
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Yes
Check the RF source and
check the connection of RF cable ?
Yes
check the Self Diagnosis
(SupportSelf DiagnosisPicture Test)
Yes
Does the DC B1.8V B3.3V
appear at #3, #5 Pin of Tuner ?
Yes
Check the CVBS data
at #15 Pin of Tuner ?
Yes
Does the digital data appear at
TP-E_TXCLK+, E_TXCLK- ,
O_TXCLK+, O_TXCLK- ?
Yes
Check the LVDS cable ?
Check the T-Con B'd ?
Replace the LCD panel ?
Power Ass'y
1 B5V
3 B5V
5 GND
7 B12VS
9 B12VS
11 B13V
13 B13V
No
No
No
No
No
No
No
Main Assy Power Assy
2 SW_PW 1 B5V
4 A5V 3 B5V
6 GND 5 GND
8 GND 7 B12VS
10 SW_INV 9 B12VS
12 NC 11 B13V
14 DMM 13 B13V
Check a set in the 'Stand-by mode'
Input the RF source properly.
Check external devices and
connections.
Change the Main Assy.
Change the Main Assy.
Check IC1001 (X5)
Change the Main Assy.
Please, Contact Tech support.
2 SW_PW
4 A5V
6 GND
8 GND
10 SW_INV
12 NC
14 DMM