LG 50PB4RT-MA (CHASSIS:PP78B) Service Manual ▷ View online
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5. In the case of becomes unusual display from rear AV mode(main)
6. In the case of becomes unusual display from rear S-Video mode(main)
7. In the case of becomes unusual display from side AV mode(main)
Is normal video input
of the A/V jack?
Is normal video input
of the A/V jack?
Is normal video input
of the A/V jack?
Check the input source
Same as Block A
Same as Block A
Same as Block A
Check the input source
Check the input source
YES
NO
YES
NO
YES
NO
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8. In the case of becomes unusual display from side S-Video mode(main)
9. In the case of becomes unusual display from SCART 1 mode(main)
10. In the case of becomes unusual display from SCART 1_RGB mode(main)
Is normal video input
of the A/V jack?
(Check R339, R341, L310)
Check the input source
Is normal video
input of the A/V jack?
(Check L111, L112,
L106)
Is normal video
input of the A/V jack?
(Check R102)
Same as Block A
Check the input source
Check the input source
Same as Block A
Same as Block A
YES
NO
YES
NO
YES
NO
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11. In the case of becomes unusual display from SCART 2 mode(main)
12. In the case of becomes unusual display from SCART 2_YC mode(main)
Is normal video
input of the A/V jack?
(Check R115)
Check the input source
Is normal video
input of the A/V jack?
(Check R115, R149)
Check the input source
Same as Block A
Same as Block A
YES
NO
YES
NO
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13. In case of becomes unusual display from RF mode(Sub)
14. In case PIP doesn’ t display from other modes(Sub)
Same as the case of main except block A should be change to B
B
Is normal video
output of the Tuner?
(Check TU201_Pin14)
Is normal the I2C
communication ?
(Check Pin5, Pin4)
Is normal the
Input voltage?
(Check L308)
Is normal the
Input voltage ?
(Check Pin8, Pin6)
Is normal video
output of CXA2069Q?
(Check R312, In case of S-Video
check R312, R314)
Is the Tuner Cable
connected well?
Change the Tuner
Check the power
(L1103)
Cable inserts well.
Is normal the I2C
communication ?
(Check R309, R310)
Change the IC(IC300)
Check the power
( Check L1004)
Change the IC (IC700)
Is the LVDS Cable
connected well?
Cable inserts well
NO
NO
NO
YES
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
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