LG 42PG20 Training Manual page 53

TCP TESTING
Typical Reading 0.65V Opposite reads open. Look for any TCPs being discolored.
Ribbon Damage. Cracks, folds Pinches, scratches, etc.
+
On any Gnd
10,11,12,13,14,27,28,2
9,30,37,38,39,40,41
-
On any Va
4,5,6,7,44,45,46,47
DAMAGED TCP
Warning: DO NOT attempt to run the set with the heat sinks over the TCPs removed.
After a very short time, these ICs will begin to self destruct due to overheating.
A damaged TCP can:
1) Cause the Power Supply to shutdown.
2) Generate abnormal vertical bars.
3) Cause the entire area driven by the TCP
to be "All White".
4) Cause the entire area driven by the TCP
to be "All Black".
5) Cause a "Single Line" defect.
CIRCUIT DeSCRIPTIONS
Va Gnd
1 5 10 15 20 25
Gnd Va
30 35 40 45 50
PDP Training - Fall 2008
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2
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