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Service Manual
BOARD DESCRIPTION
B+ Voltages Table
Preparation:
Set the following controls
Picture.......................... Normal.
Bright ...........................Normal.
Volume ......................... Min. (0).
Procedure:
1.
Apply a monoscope pattern.
2.
Connect the (-) Lead of the Digital Voltmeter to
TPBGND (Cold Ground) on B-Board.
3.
Connect the (+) Lead of the Digital Voltmeter to
Test Point (On B-Board) and confirm the B+
Voltages (See Table 3).
BOARD
DESCRIPTION
A-Board
Main chassis
MPU, Audio Amp, Convergence,
Amp and Volt Regulation
B-Board
Power supply
Horizontal Deflection and High
voltage protector
C-Board
Convergence
Digital Convergence
D-Board
Protection circuit
EHT protector, over deflection
blanking, Vertical stop blanking
F-Board
Comb filter
Digital 3-line comb filter
G-Board
A/V connections
Front A/V connections
K-Board
Costumer controls
Keyboard
LB-Board
Blue CRT drive
LG-Board
Green CRT drive
LR-Board
Red CRT drive
N-Board
2nd tuner
2nd tuner processing
R-Board
Remote sensor
Remote control board
T-Board
Line filter
X-Board
A/V inputs
VAO,FAO
Y-Board
PIP processing
No.
Test Point
Voltage
1
TPB140
138.5
±
1.0
2
TPB15
15.0
±
1.0
3
TPB7
7.0
±
0.5
4
TP23
23.0
±
1.0
5
TPB23N
-23.5
±
1.0
6
TPB32
16.5
±
1.0
Table 3: B+ Voltages Table
