Sony KLV-B20G10 User manual

REVISION HISTORY WAX
MODEL
KLV-B15G10
KLV-B20G10
PART NO.: 9-872-856-02
CHASSIS
NO. SUFFIX DATE SUPP / CORR DESCRIPTION
1 -01 2005/9 _ _ 1st Issue
2 -02 2005/12 SUPP-1 Screw change, screw indication deletion,
Part change (Pg.91)

KLV-B15G10
LCD COLOR TV
SERVICE MANUAL WAX CHASSIS
MODEL COMMANDER DEST. CHASSIS NO.
KLV-B15G10 RM-Y1108 E SCC-V51A-A
KLV-B20G10 RM-Y1108 E SCC-V51B-A
MODEL COMMANDER DEST. CHASSIS NO.
KLV-B20G10 RM-Y1108

– 2 –
KLV-B15G10/B20G10
RM-Y1108
SAFETY CHECK-OUT
After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
1. Check the area of your repair for unsoldered or poorly-soldered
connections. Check the entire board surface for solder splashes
and bridges.
2. Check the interboard wiring to ensure that no wires are “pinched”
or contact high-wattage resistors.
3. Check that all control knobs, shields, covers, ground straps, and
mounting hardware have been replaced. Be absolutely certain
that you have replaced all the insulators.
4. Look for unauthorized replacement parts, particularly transistors,
that were installed during a previous repair. Point them out to
the customer and recommend their replacement.
5. Look for parts which, though functioning, show obvious signs
of deterioration. Point them out to the customer and recommend
their replacement.
6. Check the line cords for cracks and abrasion. Recommend the
replacement of any such line cord to the customer.
7. Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts forAC Leakage. Check
leakage as described right.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a passive
VOMs that are suitable. Nearly all battery operated digital
multimeters that have a 2 V AC range are suitable. (See Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k Ω 0.15 µF
AC
Voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
WARNING!!
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK !
ON THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS
AND IN THE PARTS LIST ARE CRITICAL FOR SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS THAT
ARE CRITICAL FOR SAFE OPERATION ARE IDENTIFIED
IN THIS MANUAL. FOLLOW THESE PROCEDURES
WHENEVER CRITICAL COMPONENTS ARE REPLACED
OR IMPROPER OPERATION IS SUSPECTED.

–3 –
KLV-B15G10/B20G10
RM-Y1108
TABLE OF CONTENTS
Section Title Page
SAFETY CHECK-OUT ............................................... 2
1. DISASSEMBLY ..................................................... 4
KLV-B15G10 ........................................................................... 4
1-1. Stand Assy Removal .................................................... 4
1-2. Cabinet Rear Removal ................................................. 4
1-3. A Board Removal ........................................................ 4
1-4. B Board Removal ......................................................... 4
1-5. H1 Board Removal ...................................................... 4
1-6. H2 Board Removal ...................................................... 4
1-7. H4 Board Removal ...................................................... 5
1-8. Speaker Removal ......................................................... 5
1-9. LCD Panel Removal .................................................... 5
KLV-B20G10 ........................................................................... 6
1-1. Stand Assy Removal .................................................... 6
1-2. Cabinet Rear Removal ................................................. 6
1-3. A Board Removal ........................................................ 6
1-4. B Board Removal ......................................................... 6
1-5. D Board Removal ........................................................ 6
1-6. H1 Board Removal ...................................................... 6
1-7. H2 Board Removal ...................................................... 7
1-8. H4 Board Removal ...................................................... 7
1-9. Speaker Removal ......................................................... 7
1-10. LCD Panel Removal .................................................... 7
2. ADJUSTMENTS .................................................... 8
2-1. Aging ............................................................................ 8
2-2. Auto Adjustment of Signal Level ................................ 8
2-1-1. PAL Auto Adjustment (CVBS) ......................... 8
2-2-2. PAL Auto Adjustment (RGB) ........................... 8
2-2-3. SECAM Auto Adjustment (CVBS) .................. 8
2-3. Entering Test/TT Mode ............................................... 8
2-4. PAL White Balance Adjustment (Highlight) .............. 8
2-5. PAL White Balance Adjustment (Cutoff) ................... 9
2-6. SECAM White Balance Adjustment (Highlight) ........ 9
2-7. SECAM White Balance Adjustment (Cutoff) ............. 9
3. DIAGRAMS.......................................................... 10
3-1. Block Diagrams ......................................................... 10
(1) A (1/2) and H2 Boards ......................................... 10
(2) A (2/2) Board ....................................................... 12
(3) B and H4 Boards .................................................. 14
(4) D Board ................................................................ 16
3-2. Circuit Boards Location ............................................ 18
3-3. Schematic Diagrams Information.............................. 19
3-2-1. A Board –(Block 001) .................................... 20
3-2-2. A Board –(Block 002) .................................... 22
3-2-3. A Board –(Block 003) .................................... 24
3-2-4. A Board –(Block 004) .................................... 26
3-2-5. B Board –(Block 001) .................................... 28
3-2-6. B Board –(Block 002) .................................... 30
3-2-7. B Board –(Block 003) .................................... 32
3-2-8. B Board –(Block 004) .................................... 34
3-2-9. B Board –(Block 005) .................................... 35
3-2-10. B Board –(Block 006) .................................. 37
3-2-11. D Board –(Block 001) (KLV-B20G10) ....... 39
3-2-12. D Board –(Block 002) (KLV-B20G10) ....... 41
3-2-13. D Board –(Block 003) (KLV-B20G10) ....... 43
3-2-14. D Board –(Block 004) (KLV-B20G10) ....... 45
3-2-15. H1 Board Schematic Diagram ...................... 47
3-2-16. H2 Board Schematic Diagram ...................... 49
3-2-17. H4 Board Schematic Diagram ...................... 50
3-4. Voltage Measurements and Waveforms .................... 51
3-5. Printed Wiring Boards ............................................... 60
3-6. Semiconductors .......................................................... 67
4. EXPLODED VIEWS
KLV-B15G10 ......................................................................... 69
4-1. Cabinet Rear Assy and Stand Assy ........................... 69
4-2. Chassis (1) .................................................................. 70
4-3. Chassis (2) .................................................................. 71
KLV-B20G10 ......................................................................... 72
4-1. Cabinet Rear Assy and Stand Assy ........................... 72
4-2. Chassis (1) .................................................................. 73
4-3. Chassis (2) .................................................................. 74
5. ELECTRICAL PARTS LIST ............................... 75
OPERATING INSTRUCTIONS
Section Title Page

–4 –
KLV-B15G10/B20G10
RM-Y1108
3Terminal board bracket
4Seven screws
(+BVTT 3x6(S))
5A board
1Three screws
(+BVTP 3x10)
2Two screws
(+BVTP 3x10)
SECTION 1
DISASSEMBLY
(KLV-B15G10)
1-6. H2 BOARD REMOVAL1-5. H1 BOARD REMOVAL
1-1. STAND ASSY REMOVAL 1-2. CABINET REAR REMOVAL
1-3. A BOARD REMOVAL 1-4. B BOARD REMOVAL
2Four screws
(+PSW 4x12)
1One screw
(+BVTP 4x12)
3Stand assy (15)
1Nine screws
(+BVTP 4x12)
2Cabinet
Rear (15)
2Three screws
(+BVTT 3x6(S))
1Two screws
(+BVTT 3x6(S))
3Radiation board
5B board
4Flexible Connector
Assy 50P
1Four screws
(+BVTP 3x10)
1
3Two screws
(+BVTP 3x10)
1
4H1 board
2Holder Side Jack (15)
1One screw
(+BVTP 3x10)
2Light guide
3H2 board