4-1-6. No Video_Tuner DTV (A Type)
Symptom Audio is normal but no picture is displayed on the screen. -
Major
checkpoints
Check the DTV source. -
Check the Tuner, Check the Chelsea. -
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected. -
Diagnostics
Does the DC TU5V_PW, TU33V_PW
appear at TP - TUNER_33V, B 5V
Pin of Tuner ?
Check the 'signal strength' in Self Diagnosis
menu Strength is enough ?
Does the digital data appear at
TP - O_TXCLK+, O_TXCLK-,
F_TXCLK+, F_TXCLK- ?
Yes
Yes
Yes
Yes
Yes
Check a set in the 'Stand-by mode'
Input the RF source properly.
Please, Contact Tech support.
Change the Main Assy.
Check the D-TV source.
Check IC301 (SX1).
Change the Main Assy.
No
No
No
No
No
No
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Check the RF source and
check the connection of RF cable ?
Check the LVDS cable?
Check the T-Con B'd?
Replace the LCD panel?
2
Caution Make sure to disconnect the power before working on the IP board.
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