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KLV-70X300A
SERVICE MANUAL China Model




FIX2 CHASSIS




LCD Digital Colour TV


D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
SPECIFICATIONS




KLV-70X300A (CH) 2

D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
KLV-70X300A (CH) 3

D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
WARNINGS AND CAUTIONS SAFETY-RELATED COMPONENT
WARNING
CAUTION
It is essential that all critical parts be replaced only with the part
These servicing instructions are for use by qualified service number specified in the electrical parts list to prevent electric
personnel only. shock, fire, or other hazard.
To reduce the risk of electric shock, do not perform any servicing
other than that contained in the operating instructions unless you NOTE: Do not modify the original design without obtaining
are qualified to do so. written permission from the manufacturer or you will
void the original parts and labor guarantee.
WARNING!!

An isolation transformer should be used during any service to USE CAUTION WHEN HANDLING THE LCD PANEL
avoid possible shock hazard, because of live chassis.
The chassis of this receiver is directly connected to the ac power When repairing the LCD panel, be sure you are grounded by
line. using a wrist band.

! SAFETY-RELATED COMPONENT When repairing the LCD panel on the wall, the LCD panel must
WARNING!! be secured using the 4 mounting holes on the rear cover.
1) Do not press on the panel or frame edge to avoid the risk of
electric shock.
Replace all components with Sony parts whose part numbers
2) Do not scratch or press on the panel with any sharp objects.
appear as shown in this manual or in supplements
3) Do not leave the module in high temperatures or in areas of
published by Sony. high humidity for an extended period of time.
4) Do not expose the LCD panel to direct sunlight.
5) Avoid contact with water. It may cause a short circuit within
the module.
6) Disconnect the AC power when replacing the backlight (CCFL)
or inverter circuit.
(High voltage occurs at the inverter circuit at 650Vrms.)
7) Always clean the LCD panel with a soft cloth material.
8) Use care when handling the wires or connectors of the inverter
circuit. Damaging the wires may cause a short.
9) Protect the panel from ESD to avoid damaging the electronic
circuit (C-MOS).




KLV-70X300A (CH) 4

D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
SAFETY CHECK-OUT

After correcting the original service problem, perform the Leakage Test
following safety checks before releasing the set to the customer: The AC leakage from any exposed metal part to earth ground
and from all exposed metal parts to any exposed metal part
1. Check the area of your repair for unsoldered or poorly having a return to chassis, must not exceed 0.5 mA (500
soldered connections. Check the entire board surface for microamperes).
solder splashes and bridges. Leakage current can be measured by any one of three methods.

2. Check the interboard wiring to ensure that no wires are
1. A commercial leakage tester, such as the Simpson 229 or
"pinched" or touching high-wattage resistors.
RCA WT-540A. Follow the manufacturers' instructions to
use these instructions.
3. Check that all control knobs, shields, covers, ground straps,
and mounting hardware have been replaced. Be absolutely
2. A battery-operated AC milliampmeter. The Data Precision
certain that you have replaced all the insulators.
245 digital multimeter is suitable for this job.
4. Look for unauthorized replacement parts, particularly
3. Measuring the voltage drop across a resistor by means of a
transistors, that were installed during a previous repair. Point
VOM or battery-operated AC voltmeter. The "limit"
them out to the customer and recommend their replacement.
indication is 0.75 V, so analog meters must have an accurate
low voltage scale.
5. Look for parts which, though functioning, show obvious
The Simpson's 250 and Sanwa SH-63TRD are examples of
signs of deterioration. Point them out to the customer and
passive VOMs that are suitable. Nearly all battery-operated
recommend their replacement.
digital multimeters that have a 2 VAC range are suitable (see
Figure A).
6. Check the line cords for cracks and abrasion. Recommend
the replacement of any such line cord to the customer.
How to Find a Good Earth Ground
7. Check the antenna terminals, metal trim, "metallized" A cold-water pipe is a guaranteed earth ground; the cover-plate
knobs, screws, and all other exposed metal parts for AC retaining screw on most AC outlet boxes is also at earth ground.
leakage. Check leakage as described below. If the retaining screw is to be used as your earth ground, verify
that it is at ground by measuring the resistance between it and a
cold-water pipe with an ohmmeter. The reading should be zero
ohms.

If a cold-water pipe is not accessible, connect a 60- to 100-watt
trouble- light (not a neon lamp) between the hot side of the
receptacle and the retaining screw. Try both slots, if necessary,
to locate the hot side on the line; the lamp should light at normal
brilliance if the screw is at ground potential (see Figure B).


To Exposed Metal
Parts on Set



Trouble Light
Ohmmeter
AC Outlet Box
AC
0.15 µF Voltmeter
o
(0.75V)

Cold-water Pipe



Earth Ground




FigureA. Using an AC voltmeter to check AC leakage. Figure B. Checking for earth ground.




KLV-70X300A (CH) 5

D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
SELF DIAGNOSIS FUNCTION

The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY LED will automatically begin to flash.
The number of times the LED flashes translates to a probable source of the problem.
A definition of the STANDBY LED flash indicators is listed in the instruction manual for the user's knowledge and reference.
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.

1-1. DIAGNOSTIC TEST INDICATORS
When an error occurs, the STANDBY LED will flash a set number of times to indicate the possible cause of the problem.
If there is more than one error, the LED will identify the first of the problem areas.
Result for all of the following diagnostic items are displayed on screen.
If the screen displays a "0", no error has occurred .


Number of times STANDBY LED Monitoring Items
Diagnostic Item Description
(Red) flashes (Screen Display)
2 times POW OVP Main Power Over Voltage Protection
3 times POW ERR1 Power Error
5 times T_CON T_CON Error
6 times BACKLITE Back Light Error
7 times PANL TEMP Temperature Abnormal Detection
8 times AUD PROT Audio Abnormal Detection
9 times FAN_ERR FAN Error
10 times DTT ERR DTAU Power (Not used)
13 times BALANCER Panel Balancer Error (Not used)

1-2. DISPLAY OF STANDBY LED FLASH COUNT
[ FLASH COUNT ]
2 times

4 times

5 times

LED ON 0.3 sec.
LED OFF 0.3 sec. LED OFF
3 sec.

Note: One flash counts is not self-diagnostic.




STANDBY
INDICATOR




1-3. STOPPING THE STANDBY FLASH
Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY LED from flashing.




KLV-70X300A (CH) 6

D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
1-4. 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 occurrences of failure for confirmation on the screen.

1-4-1. To Bring Up Screen Test
In standby mode, press buttons on the remote commander sequentially in rapid succession as shown below:




Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen
After you have completed the repairs, clear the result display to "0".

1-5. Quitting Self-diagnostic screen
To quit the entire self-diagnostic screen, turn off the power switch on the remote commander or the main unit.




KLV-70X300A (CH) 7

D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
TABLE OF CONTENTS
SAFETY CHECK-OUT ............................................. 5

SELF DIAGNOSIS FUNCTION ................................ 6

1. DISASSEMBLY ............................................... 1-1
1-1. BEZEL ASSY REMOVAL ................................... 1-1
1-2. REAR COVER ASSY REMOVAL ...................... 1-1
1-3. STAND ASSY AND ARM ASSY REMOVAL ... 1-2
1-4. HW2 BOARD AND SIDE TERMINAL ASSY
REMOVAL ............................................................ 1-2
1-5. H1 BOARD REMOVAL ....................................... 1-3
1-6. UB1 BOARD REMOVAL ..................................... 1-3
1-8. TUG BOARD AND CHASSIS BRACKET ASSY
REMOVAL ............................................................ 1-4
1-7. FB2 BOARD AND AG BOARD REMOVAL ..... 1-4
1-9. G1P2, G2P2 AND FP BOARDS REMOVAL ...... 1-5
1-10. AC INLET AND UNDER COVER REMOVAL .. 1-5
1-11. LD3 BOARD REMOVAL ..................................... 1-6
1-12. FAN (R) REMOVAL ............................................. 1-6
1-13. FAN (L) REMOVAL ............................................. 1-7
1-14. LOUDSPEAKER, H3 BOARD AND H4 BOARD
REMOVAL ............................................................ 1-7
1-15. CABINET ASSY REMOVAL .............................. 1-8
1-16. WIRING LAYOUT ................................................ 1-9

2. SERVICE ADJUSTMENTS ............................. 2-1

3. DIAGRAMS ..................................................... 3-1
3-1. CIRCUIT BOARDS LOCATION ......................... 3-1

4. EXPLODED VIEWS ........................................ 4-1
4-1. REAR COVER ASSY AND BEZEL ASSY ......... 4-2
4-2. ARM ASSY AND STAND ASSY ........................ 4-3
4-3. CHASSIS-1 ............................................................ 4-4
4-4. CHASSIS-2 ............................................................ 4-5
4-5. CABINET ASSY ................................................... 4-6
4-6. PACKING MATERIALS ...................................... 4-7




KLV-70X300A (CH) 8

D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
SECTION 1
DISASSEMBLY

1-1. BEZEL ASSY REMOVAL


1 Nine screws
(+TP M4X12)

Take off a screw of
mark side (17pcs).




1 Eight screws
(+TP M4X12)




2 Bezel assy




1-2. REAR COVER ASSY REMOVAL


1 Four screws
(+PSW M5X20)

4 Two screws 6 Two screws
(+PSW M4X12) (+BV 3X12)
3 Two screws
3 Eleven screws (+BVTP2 4X16)
(+BVTP2 4X16)
5 Four screws
(+BVST 4X12)
4 Two screws
(+PSW M4X12)


3 Ten screws
(+BVTP2 4X16)




7 Rear cover assy




2 Handle
Take off a screw of arrow
mark side (21pcs).




KLV-70X300A (CH) 1-1

D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
1-3. STAND ASSY AND ARM ASSY REMOVAL
3 Five screws
(+PSW M4X12)

5 Five screws
(+PSW M4X12)
3 Six screws
(+PSW M4X12) 6 Arm



4 Arm 1 Two screws
(+PSW M8X16) 2 Base stand assu
7 Four screws
5 Six screws (+PSW M4X12)
(+PSW M4X12)




8 Stand holder

1 Two screws
(+PSW M8X16)
0 Stand holder
9 Four screws
(+PSW M4X12)




1-4. HW2 BOARD AND SIDE TERMINAL ASSY REMOVAL
2 One screw
(+BVTP3X12)
5 One screw
1 One screw
(+BVTP3X12)
(+PSW M4X12)
4 One screw
(+PSW M4X12)


3 Plate (Ground A)

6 Plate (Ground B)
8 HW2 board
7 One screw
(+PSW3X8)


9 Two screws
(+BVTP2 4X16) Claws




0 Side terminal assy




KLV-70X300A (CH) 1-2

D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
1-5. H1 BOARD REMOVAL




1 Two screws
3 H1 board (+BVTP2 4X16)




2 Control button block assy




1-6. UB1 BOARD REMOVAL


4 Seven screws
(+PSW M3X8)


5 Bracket (UB)

To FB2 board

1 Eight screws 6 Lead wire with connector(LVDS)
(+PSW M3X8)
8 UB1 board



7 Four screws (+BVST 3X8)

2 LVDS shield




3 Lead wire with connector(LVDS)



KLV-70X300A (CH) 1-3

D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
1-7. FB2 BOARD AND AG BOARD REMOVAL
3 One screws
(+BVST 3X8)
2 Two screws
1 Card bracket assy (+PSW M3X8) 8 Board to board connector 80P
4 Two screws (HEX)
9 Board to board connector 50P
3 Four screws
(+BVST 3X8)
3 One screw 0 Six screws
(+BVST 3X8) (+BVST 3X8)
qa AG board
0 Three screws
(+BVST 3X8)

6 Five screws 5 FB top shield
(+BVST 3X8)
6 Five screws
(+BVST 3X8)




7 FB2 board




1-8. TUG BOARD AND CHASSIS BRACKET ASSY REMOVAL
3 Pin Cable
6 Two screws 4 RF Splitter
(+BVST 3X8) 5 Connector assy


6 Two screws
(+BVST 3X8) 1 TU bracket assy

7 TUG board


8 Four screws
(+BVST 3X8)
0 Two screws
(+PSW M3X8)
Claws
2 One Screw
(+PSW M3X5)

9 Tuner shield (lower) assy

0 Three screws
(+PSW M3X8)

qa Chassis bracket




KLV-70X300A (CH) 1-4

D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
1-9. G1P2, G2P2 AND FP BOARDS REMOVAL

1 Four screws
(+PSW M3X8)
7 Four screws
(+PSW M3X8)

4 Four screws
(+PSW M3X8)

3 G1P2 board
8 FP board

6 G2P2 board




2 Five circuit board supports

5 Two circuit board supports



1-10. AC INLET AND UNDER COVER REMOVAL

3 Two screws
6 Four screws (+PSW M3X12)
(+PSW M3X8)

4 Plug holder (A)

5 AC inlet

7 AC inlet holder


1 One screw
(+PSW M4X12)
2 Earth read



8 One screw
(+PSW M4X12)



9 Under cover




KLV-70X300A (CH) 1-5

D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
1-11. LD3 BOARD REMOVAL

1 Five screws
(+PSW M3X8)




2 LD3 board




1-12. FAN (R) REMOVAL

2 Four screws
(+PSW M3X8)




3 Fan bracket 1 Fan cushion



4 Cushion (FAN spacer)




4 Cushion (FAN spacer)
5 D.C.FAN




KLV-70X300A (CH) 1-6

D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
1-13. FAN (L) REMOVAL
1 Fan cushion


2 Four screws
(+PSW M3X8)



4 Cushion (FAN spacer)
3 Fan bracket




5 D.C.FAN


4 Cushion (FAN spacer)




1-14. LOUDSPEAKER, H3 BOARD AND H4 BOARD REMOVAL
1 Two screws
(+PWH 4X16)
2 Speaker



3 Two screws (+PSW M3X8)

4 Speaker support



9 H4 board 5 Two screws
(+PWH 4X16)
6 Speaker




7 Two screws
(+PSW M3X8)
0 H3 board




8 Speaker support




KLV-70X300A (CH) 1-7

D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
1-15. CABINET ASSY REMOVAL




7 Three screws
2 Four screws (+PSW M4X12)
(+PSW M4X12) 8 Four screws
(+BVTP2 4X16)

1 Ten screws
(+BV 3X12)
7 Three screws
(+PSW M4X12)
qa Three screws
(+PSW M4X8) 8 Four screws
(+BVTP2 4X16)
3 Stay (vert) 9 Stay (horiz, lower)) 4 Six screws
(+PSW M4X12)
0 Three screws
(+BVTP2 4X16) qf Three screws 5 Ten screws
(+BVTP2 4X16) (+BV 3X12)


6 Stay (vert)

qs Stay (horiz, upper)




qd Three screws
(+PSW M4X8)
qh LCD panel


qg Stay (horiz, upper)




Cabinet assy




KLV-70X300A (CH) 1-8

D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
1-16. WIRING LAYOUT




CN2005 CN2013 2010 2009
T-CON board
CN2006
LT3 board CN2012 2008 2007
LC3 board
Fan CN2006 CN2006
Fan
LP3 board