Read LG 32LG50D (CHASSIS:LT81D) Service Manual online
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3. In case of no display on the screen in specific modes
(1) Symptom
- There is no screen display from a specific input mode.
(RF, AV, Component, RGB, HDMI)
(2) Procedure check
- Check the all input mode have normal display.
(3) In case of an unusual display in RF mode
(4) In case of an unusual display in Component1,2,RGB mode
(5) In case of an unusual display in AV mode
Is the Tuner normal?
Is the CXA2069(IC300)
normal?
Is the RF Cable connected?
Re-insert the RF cable.
Yes
No
No
Yes
Is the Torino(IC1200)
normal?
Replace the Tuner.
Are the Input voltage, IIC Communication
and CVBS output normal?
Yes
Are the Input voltage, IIC
Communication and HV sync normal?
No
Replace the IC300.
No
Are the input voltage, IIC
Communication and HV sync normal?
No
Replace the IC1200.
No
No
Are the AV input of JK103,
JK104 or SK105 normal?
Yes
Is the CXA2069(IC300)
normal?
Check the input source.
No
Are the Input voltage, IIC Communication
and HV sync normal?
and HV sync normal?
No
Replace the IC300.
No
Yes
Same as Block A
Block A
Is the RGB input and H,V Sync of the P601 normal?
Is the Component input of JK100 or JK101 normal?
Is the Component input of JK100 or JK101 normal?
Yes
Same as Block A
Check the input source.
No
(6) In case of an unusual display in HDMI mode
Is the SIL9125(IC702)
normal?
Are Input voltage, IIC Communication
and HV sync normal?
No
Replace IC702.
No
Yes
Same as Block A
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