Abnormal Screen (Hdmi)-Main Pcba - LG 22LN4050 Service Manual

6. Abnormal screen (HDMI)-Main PCBA

Abnormal screen (HDMI)
1
Put into HDMI
cable completely?
2
Is Input signal timing
and format in spec?
Can read EDID and
3
HDCP key though
16,15pin of JK204
4
Is 5V at 19pin of JK204?
5
Is waveform at 10,12pin
of JK204?
6
Is waveform at 1,3,4,6,7,9pin
Of JK204?
Change IC501
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Only for training and service purposes
NO
YES
NO
YES
YES
YES
NO
YES
NO
YES
Change Timing according to
product spec, change f ormat
under 8 bit in Ycbcr, Ypbpr, RGB
Check Line between JK204 and IC501
is open or short, Another is
Check Line between JK204 and IC501
is open or short, Another is
Change IC501 or HDMI cable
Check Line between JK204 and IC501
is open or short, Another is
Check Line between JK204 and IC501
is open or short, Another is
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insulted HDMI cable
Change HDMI cable
Change HDMI cable
Change HDMI cable
LGE Internal Use Only