DOWNLOAD Sony KV-XG29N90 Service Manual ↓ Size: 2.74 MB | Pages: 53 in PDF or view online for FREE

Model
KV-XG29N90
Pages
53
Size
2.74 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
File
kv-xg29n90.pdf
Date

Sony KV-XG29N90 Service Manual ▷ View online

– 6 –
KV-XG29N90
RM-915
4.
SELF-DIAGNOSTIC SCREEN DISPLAY
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” 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 [+]).
Self-Diagnosis screen display
5.
HANDLING OF SELF-DIAGNOSTIC SCREEN DISPLAY
Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen
during repairs. When you have completed the repairs, clear the result display to “0”.
Unless the result display is cleared to “0”, the self-diagnostic function will not be able to detect subsequent faults after
completion of the repairs.
[Clearing the result display]
To clear the result display to “0”, press buttons on the remote commander sequentially as shown below when the diagnostic
screen is being displayed.
Channel [8] / 0
[Quitting Self-diagnostic screen]
To quit the entire self-diagnostic screen, turn off the power switch on the remote commander or the main unit.
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.
101 : 000
SELF DIAGNOSTIC
– 7 –
KV-XG29N90
RM-915
6.
SELF-DIAGNOSTIC CIRCUIT
[+B overcurrent ªOCPº]
Occurs when an overcurrent on the +B(135) line is detected by Q604. If Q604 go to ON
and the voltage to pin 18 of IC301 should go down when V.SYNC is more than seven
verticals in a period, the unit will automatically turn off.
[Vertical deflection stopped]
Occurs when an absence of the vertical deflection pulse is detected by Q509 and IC001
shut down the power supply.
[Vertical deflection overcurrent]
Occurs when an overcurrent on V drive line is detected by Q507. Power supply will be
shut down when detect this by IC001.
[White balance failure]
If the RGB levels* do not balance or become low level within 5 seconds, this error will be
detected by IC301. TV will stay on, but there will be no picture.
* (Refers to the RGB levels of the AKB detection Ref pulse that detects IK.)
IC301
Y/CHROMA JUNGLE
FROM
CRT
FROM
[+B] Q604 C6
[V] Q509/507
IC001
SYSTEM
IC003
MEMORY
B-DAT
IO-SDAT
IK-IN
MP/
PROTECT
IO-8DAT
O-LED
SDA
5
45
21
18
51
46
35
 19 
KV
-XG29N90
RM-915
2-4. SERVICE POSITION
(Note: Remove F Bracket first.)
SECTION 2
DISASSEMBLY
2-3. CHASSIS ASSY REMOVAL
2-2. SPEAKER REMOVAL
2-1. REAR COVER REMOVAL
2 Eight screws
     (+BVTP 4 
× 16)
3 Three screws
     (+BVTP 4 
× 16)
1 Rear cover
1 Eight screws
  (+BVTP 4 
× 16)
3 Four screws
  (+BVTP 3 
× 16)
2 Bracket, speaker
1 Chassis assy
 20 
KV
-XG29N90
RM-915
2-7. TERMINAL BRACKET REMOVAL
2-5-2. REPLACEMENT OF LIGHT GUIDE
2-5. REPLACEMENT OF PARTS
For replacement of the Control Button and Light Guide, unscrew them, exchange
with the new parts, and fix them with screws (+BVTP) respectively.
2-5-1. REPLACEMENT OF CONTROL BUTTON
2-6. D3 BOARD REMOVAL
Control button
Two screws
(+BVTP 3 
× 12)
One screw
(+BVTP 3 
× 12)
1 Three connectors
2 One claw
3 D3 board
3 Two claws
4 Terminal bracket
1 Two screws
     (+ BVTP 3 
× 12)
2 One screw
     (+ BVTP 4 
× 16)
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