LG 32LF7300 Service Manual page 26

2) In case of does't display the screen into specific mode
(1) Symptom
(1) The screen does not become the display from specific input mode
(RF, AV, Component, RGB, HDMI).
(2) Check follow
(1) Check the all input mode which is normal or not.
(3) In case of becomes unusual display from D/A mode
Is normal the Tuner?
(DVB&ANALOG)
Yes
Block A
Is normal the
U102(FLI10620H)
(4) In case of becomes unusual display from A/V mode
Is Video input of the AV
Jack(JP17) normal?
Yes
Same as Block A
(5) In case of becomes unusual display from Component, RGB mode
Is R,G,B input and H,V sync
of the JP8 normal?
Yes
Same as Block A
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Only for training and service purposes
No
Is the Tuner cable
connected well?
Cable inserts well.
No
Is normal the Input voltage, I2C
Communication and HV sync?
No
Check the input source.
No
Check the input source.
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Yes
No
Yes
Is normal the Input voltage,
I2C Communication and
AV2 CVBS output?
No
Replace Tuner or Main
Board.
Replace IC or Main
Board.
LGE Internal Use Only