Symptom:
Dark picture - Dark screen with a dim picture.
Cause:
There is no Sustain Control Pulse at pin 4 of the C or SS connector listed
below. The voltage Ve of the initializing and address period of Sustain
Drive Signal is missing.
The problem is the D board.
Figure 62
The approach to find the defective board is to check pin 4 of the connectors listed in the
table below.
Check Point
Model
Connector NO.
Pin NO.
37"HD
C32
42"SD
C23
42"HD
C32
50"HD
SS44
4
Defective Board
OK
SS Board
NG
D Board
Table 15
79
Summary of Contents for TH-42PX50U
Page 40: ...SC board Waveform Figure 30 SU And SD Board Shift Registers Figure 31 35 ...
Page 43: ...SS Board Schematic Figure 33 SS Board Waveform Figure 34 38 ...
Page 66: ...Adjustment Volume Locations Figure 53 61 ...
Page 67: ...Test Point Locations Figure 54 62 ...
Page 71: ...Scan and Sustain Drive Waveform Figure 55 Scan and Sustain Drive Check points Figure 56 66 ...
