LED Blinks Once (140V Overcurrent Protection)
The transistor Q854 monitors current of the 140V source. Excessive current
cau
voltage dr
ss R8
e.
voltage at the base of Q854 becomes more negative as com
The
or turns o
s outp
le
Boa
n 15 of th
ctor D
co
g
the MPU to activate shutdown and turn off the AC Relay
L8
DG -BOARD
A-Board
140V
SOS
Norm
D-Board
SOS
A31
53
D2 A2
15
15
Figure 42
ses the
op acro
57 and R858 to increas As a result, the
pared to its emitter.
transist
n and it
ut goes high. This DC vel enters the DG-
rd via pi
e conne
2/A2 and pin 53 of the
R
nnector A31 causin
01.
80
Summary of Contents for PT47WXD63 - 47" PROJECTION TV
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