Read LG 22LP350H (CHASSIS:LM91M) Service Manual online
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6. Abnormal screen (HDMI)-Main PCBA
Put into HDMI
cable completely?
Abnormal screen (HDMI)
YES
NO
NO
insulted HDMI cable
1
Change IC501
Is Input signal timing
and format in spec?
Change Timing according to
product spec, change format
under 8 bit in Ycbcr, Ypbpr, RGB
2
Is waveform at 10,12pin
of JK204?
3
Check Line between JK204 and IC501
is open or short, Another is
Change HDMI cable
NO
YES
YES
Is waveform at 1,3,4,6,7,9pin
Of JK204?
YES
4
Check Line between JK204 and IC501
is open or short, Another is
Change HDMI cable
NO
Can read EDID and
HDCP key though
16,15pin of JK204
Check Line between JK204 and IC501
is open or short, Another is
Change HDMI cable
YES
Is 5V at 19pin of JK204?
Check Line between JK204 and IC501
is open or short, Another is
Change IC501 or HDMI cable
5
YES
6
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