KV-DR29M50B - Sony TV Service Manual (repair manual)

MODEL

COMMANDER   DEST.

CHASSIS NO.

KV-DR29M50B

RM-964 Vietnam

SCC-U85C-A

®

RM-964

– 2 –

SELF DIAGNOSTIC FUNCTION ..................................3

1-1.

Rear Cover Removal .................................................. 6

1-2.

Speaker Removal ........................................................ 6

1-3.

Chassis Assy Removal ................................................ 6

1-4.

Service Position .......................................................... 6

1-5.

Service Position on TV Stand .................................... 6

1-6.

Terminal Bracket Removal ......................................... 7

1-7.

B3 and D5 Boards Removal ....................................... 7

1-8.

F1 Board Removal ...................................................... 7

1-9.

BC2 Board Removal .................................................. 7

1-10. H1 and H2 Boards Removal ...................................... 7
1-11. A and D Boards Removal ........................................... 7
1-12. Picture Tube Removal ................................................ 8

2-1.

Jigs Required For Servicing ...................................... 9

3. CIRCUIT BOARDS LOCATION ...................................9

4-1.

"RESET" Function ................................................... 10

5-1.

Beam Landing .......................................................... 11

5-2.

Convergence Adjustment ......................................... 12

5-3.

Focus Adjustment ..................................................... 14

5-4.

Neck Assy Twist Adjustment ................................... 14

5-5.

G2 (SCREEN) and White Balance Adjustment ....... 14

6-1.

Adjustment With Commander ................................. 15

6-2.

Adjustment Method .................................................. 15

6-3.

Picture Quality Adjustments .................................... 34

6-4.

Sub Hue/Col Adjustment .......................................... 34

6-5.

Deflection Adjustments ............................................ 35

6-6.

A Board Adjustment After IC003 (MEMORY)
Replacement ............................................................. 36

6-7.

Picture Distortion Adjustment .................................. 37

7-1.

Block Diagram ......................................................... 38

7-2.

Schematic Diagrams ................................................. 47
7-2-1. A Board (Page 1/2) Schematic Diagram ...... 48
7-2-2. A Board (Page 2/2) Schematic Diagram ...... 50
7-2-3. B3 Board Schematic Diagram ...................... 52
7-2-4. D Board Schematic Diagram ....................... 54
7-2-5. D5 Board Schematic Diagram ..................... 56
7-2-6. C Board Schematic Diagram ........................ 58
7-2-7. BC2 Board Schematic Diagram ................... 60
7-2-8. H1 and F1 Board Schematic Diagrams ........ 62
7-2-9. VM Board Schematic Diagram .................... 64
7-2-10.H2 and J Board Schematic Diagrams .......... 66

7-3.

Voltage List and Waveform ...................................... 67

7-4.

Printed Wiring Boards and Parts Location .............. 80

7-5.

Semiconductors ........................................................ 92

8-1.

Speaker Bracket ........................................................ 95

8-2.

Chassis ...................................................................... 96

8-3.

Picture Tube .............................................................. 97

– 3 –

The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER lamp will automatically
begin to flash.
The number of times the lamp flashes translates to a probable source of the problem. If an error symptom cannot be
reproduced, the remote commander can be used to review the failure occurrence data stored in memory to reveal past
problems and how often these problems occur.

When an error occurs, the STANDBY/TIMER lamp will flash a number of times to indicate the possible cause of the
problem. If there is more than one error, the lamp will identify the first of the problem areas.

Result for all of the following diagnostic items are displayed on screen. No error has occured if the screen displays a “0”.

Diagnostic

Item

Description

• Power does not

turn on

• +B overcurrent

(OCP)

• +B overvoltage

(OVP)

• Vertical deflection

failure

• White balance

failure (no
PICTURE)

• Horizontal

deflection failure

• Micro reset

No. of times

STANDBY/TIMER

lamp flashes

Does not light

2 times

3 times

4 times

5 times

6 times

—

Self-diagnostic

display/Diagnostic

result

—

002:000 or

002:001~255

003:000 or

003:001~255

004:000 or

004:001~255

005:000 or

005:001~255

006:000 or

006:001~225

101:00 or

101:001~225

Probable

Cause

Location

• Power cord is not plugged

in.

• Fuse is burned out F1601

(F1 Board)

• H.OUT Q6807 is shorted.
• H.IN Q6810 is shorted.

Q6802 shorted.

• PH6602 faulty.

D6644 faulty, R6651 open.

• 10.5V is not supplied.

(D board)

• V.OUT IC6800 faulty

D6816 faulty
D6817 faulty
D6824 faulty
R6852 open
R6851 open (D board)

• G2 is improperly adjusted.
• CRT problem.
• Video OUT IC9001, 9002,

9003 are faulty. (C board)

• IC8306 (A board) and

IC4301 (A board) are faulty.

• C6831 is open circuit.

PS6606 open, PS6605
open. (D board)

• CRT Discharge (C Board)
• Static discharge
• External noise

Detected

Symptoms

• Power does not turn on.
• No power is supplied to the

TV.

• AC power supply is faulty.

• Power does not turn on.
• Load on power line is

shorted.

• Power does not turn on.

• Vertical deflection pulse is

stopped.

• Vertical size is too small.
• Vertical deflection stopped.

• No raster is generated.
• CRT cathode current

detection reference pulse
output is small.

• H pulse output is too high.

• Power is shut down shortly,

after this return back to
normal.

• Detect Micro latch up.

– 4 –

Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY/TIMER lamp
from flashing.

For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes off” that cannot be confirmed, it
is possible to bring up past occurances of failure for confirmation on the screen:

[To Bring Up Screen Test]
In standby mode, press buttons on the remote commander sequentially in rapid succession as shown below:

[Screen display] / channel [5] / Sound volume [-] / Power ON

˘

Note that this differs from entering the service mode (mode volume [+]).

Lamp ON 0.3 sec.

Lamp OFF 3 sec.

Lamp OFF 0.3 sec.

2 times

3 times

4 times

5 times

6 times

Diagnostic Item

Flash Count*

+B overcurrent

2 times

+B overvoltage

3 times

V deflection stop

4 times

White balance failure

5 times

Horizontal Deflection Failure

6 times

* One flash count is not used for self-diagnostic.

002 : 000
003 : 000
004 : 000
005 : 001

Numeral "0" means that no fault has been detected.

Numeral "1" means a fault has been detected.

006 : 002

101 : 000

SELF DIAGNOSTIC

Numeral "2" means two faults have been detected.

STANDBY/SLEEP lamp