LG 22MT45A - Page 22

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Only for training and service purposes
11. Abnormal sound (HDMI)-Main PCBA
Abnormal sound (HDMI)
Put into HDMI
cable completely?
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 JK203?
3
Check Line between JK203 and IC501
is open or short, Another is
Change HDMI cable
NO
YES
YES
Is waveform at 1,3,4,6,7,9pin
Of JK203?
YES
4
Check Line between JK203 and IC501
is open or short, Another is
Change HDMI cable
NO
Can read EDID and
HDCP key though
16,15pin of JK203
Check Line between JK203 and IC501
is open or short, Another is
Change HDMI cable
YES
Is 5V at 19pin of JK203?
Check Line between JK203 and IC501
is open or short, Another is
Change IC501 or HDMI cable
5
YES
6