LG 42PG6000 Service Manual page 17

5-2. 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, DVI).
(2) Check following
1) Check the all input mode should become normality display.
(3) In case of becomes unusual display from RF mode
No
Is the Tuner normal?
Yes
Block A
Operates the FLI106X0H IC(IC100)?
1.Check the Monitor OUT by SCART2 : Connect the another TV SET
2.Check the LVDS clock(R537, R538) on the VSC Board by Oscilloscope?
3.Check the each Input Source. ATV(TV_CVBS : R302), DTV(TU301 Pin23),
S/AV Mode( SIDE_CVBS_IN : R1160), Component/RGB
(COMP_Y, V/HSYNC : R1122, R1174, R1180)
HMDI(SDA/SCL : IC201 Pin29, Pin30), SCART(SC1/2_CVBS_IN : R977, R521)
on the VSC Board by Oscilloscope.
(4) In the case of becomes unusual display from side S-video/AV mode
Is Video input of the AV Jack (JK700, 707) normal?
1. Check the CVBS signal in AV jack by Oscilloscope
Yes
Same as Block A
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Is the RF Cable connected well?
1. Check the another TV set.
No
Cable inserts well or Change the RF Cable
Yes Is normal the Input voltage, IIC Communication?
1.Check the Input Voltage 5V(L303), 3.3V(L1022), 1.8V(TU301 Pin22)
2. Check the Analog/Digital IIC(A:R334,R335 D:R342, R343)
No
Check the input source of Equipment
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No
Replace the Tuner(TU301)
No
Replace the FLI106X0H
(IC100).
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