LG 50PJ340 Training Manual - Page 103

TCP 3.3V B+ Check

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TCP 3.3V B+ Check For Connectors P162 on the Control board, see Control board section. Warning: DO NOT attempt to run the set with the Heat Sink over the TCPs removed. Checking IC231 for 3.3V, use center pin or Case of component. With all connectors connected, place the Red Lead On 3.3V Diode Check (1.9V) Black Lead On 3.3V Diode Check (0.6V) This also test IC201 on the Center Board IC231 Gnd 3.29V 4.94V 3.3V for TCPs IC53 on Control Board 3.3V in on Pins 1 ~ 5 only on P232 connector from the Control board Center X Board P232 103 3.3V All Connectors to All TCPs look very similar for the 3.3V test point. The trace at pins 32 and 33 of each connector. There is a small feed trough and a Cap, you can use for Test Points. Example here from P204. You can only check for continuity back to IC231, you can not run the set with heat sink removed. July 2010 50PJ350 Plasma

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103
July 2010
50PJ350
Plasma
TCP 3.3V B+ Check
TCP 3.3V B+ Check
Warning: DO NOT attempt to run the set with the
Heat Sink over the TCPs removed.
Checking IC231 for 3.3V, use center pin or Case of component.
IC231
Gnd
3.29V
4.94V
3.3V in on Pins 1 ~ 5 only on P232 connector from the Control board
Center X Board P232
For Connectors P162 on the
Control board, see Control
board section.
3.3V for TCPs
IC53 on
Control Board
All Connectors to All TCPs look very
similar for the 3.3V test point. The trace
at pins 32 and 33 of each connector.
There is a small feed trough and a Cap,
you can use for Test Points.
Example here from P204. You can only
check for continuity back to IC231, you
can not run the set with heat sink
removed.
With all connectors connected, place the Red
Lead On 3.3V Diode Check (1.9V)
Black Lead On 3.3V Diode Check (0.6V)
This also test IC201 on the Center Board
3.3V