LG 42PW350 - TCP 3.3 V B+ Check; TCP 3.3 V Voltage Check

TCP 3.3V B+ Check
Warning: DO NOT attempt to run the set with the
Heat Sink over the TCPs removed.
Checking
IC53
for 3 3V use center pin or Case of component
For Connectors P107 and
P108 on the Control board,
Ctlb d ti
Checking
IC53
for
3
.
3V
,
use
center
pin
or
Case
of
component
.
see
C
on
t
ro
l
b
oar
d
sec
ti
on.
With all connectors connected, place the
Red Lead On 3.3V = Diode Check (0.53V)
Black Lead On 3.3V = Diode Check (0.32V)
5.0V
3.3V for TCPs
IC121 on
3.3
V
3.3V in on Pins 1 ~ 5 only on P232 connector from the Control board
Control Board
With all connectors removed, place the
Red Lead On 3.3V = Diode Check (0.66V)
Black Lead On 3.3V = Diode Check (0.36V)
Gnd
Control Board
P161 and P162
3.3V
3.3V
All Connectors to All TCPs look very
similar for the 3.3V test point. The
DC
Continuity
3.3V
picture shows the trace at pins 33 and
34 for each connector. There is a small
feed trough and a Cap, you can use for
Test Points.
Example here from P305. You can only
check for continuity back to IC231 you
June 2011 42PW350 Plasma
130
check
for
continuity
back
to
IC231
,
you
can not run the set with heat sink
removed.