Sony KLV-70X300A Service Manual
D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
SERVICE MANUAL
FIX2 CHASSIS
LCD Digital Colour TV
China Model
KLV-70X300A
D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
KLV-70X300A (CH) 2
SPECIFICATIONS
D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
KLV-70X300A (CH) 3
D846660B279CC0D5520DEF8E80C6FD0B0509C3DE5F2E1AA689414F35FDFA3F98261139660559AE28
KLV-70X300A (CH) 4
CAUTION
These servicing instructions are for use by qualified service
personnel only.
To reduce the risk of electric shock, do not perform any servicing
other than that contained in the operating instructions unless you
are qualified to do so.
WARNING!!
An isolation transformer should be used during any service to
avoid possible shock hazard, because of live chassis.
The chassis of this receiver is directly connected to the ac power
line.
! SAFETY-RELATED COMPONENT
WARNING!!
Replace all components with Sony parts whose part numbers
appear as shown in this manual or in supplements
published by Sony.
WARNINGS AND CAUTIONS SAFETY-RELATED COMPONENT
WARNING
It is essential that all critical parts be replaced only with the part
number specified in the electrical parts list to prevent electric
shock, fire, or other hazard.
NOTE: Do not modify the original design without obtaining
written permission from the manufacturer or you will
void the original parts and labor guarantee.
USE CAUTION WHEN HANDLING THE LCD PANEL
When repairing the LCD panel, be sure you are grounded by
using a wrist band.
When repairing the LCD panel on the wall, the LCD panel must
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.
2) Do not scratch or press on the panel with any sharp objects.
3) Do not leave the module in high temperatures or in areas of
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).
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KLV-70X300A (CH) 5
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 touching 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 for AC
leakage. Check leakage as described below.
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 instructions.
2. A battery-operated AC milliampmeter. 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’s 250 and Sanwa SH-63TRD are examples of
passive VOMs that are suitable. Nearly all battery-operated
digital multimeters that have a 2 VAC range are suitable (see
Figure A).
How to Find a Good Earth Ground
A cold-water pipe is a guaranteed earth ground; the cover-plate
retaining screw on most AC outlet boxes is also at earth ground.
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).
Exposed Meta
l
Parts on Se
t
.15
µ
Earth Groun
d
AC
0.75V
)
ouble Ligh
t
AC Outlet Box
Ohmmeter
Col
d-water Pi
pe
FigureA. Using an AC voltmeter to check AC leakage. Figure B. Checking for earth ground
.
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KLV-70X300A (CH) 6
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
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.
SELF DIAGNOSIS FUNCTION
2 times
4 times
5 times
LED ON 0.3 sec.
LED OFF 0.3 sec.
LED OFF
3 sec.
[ FLASH COUNT ]
Note: One flash counts is not self-diagnostic.
STANDBY
INDICATOR
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KLV-70X300A (CH) 7
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.
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KLV-70X300A (CH) 8
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
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KLV-70X300A (CH) 1-1
SECTION 1
DISASSEMBLY
1-1. BEZEL ASSY REMOVAL
1-2. REAR COVER ASSY REMOVAL
1 Nine screws
(+TP M4X12)
2 Bezel assy
1 Eight screws
(+TP M4X12)
Take off a screw of
mark side (17pcs).
3 Eleven screws
(+BVTP2 4X16)
3 Two screws
(+BVTP2 4X16)
6 Two screws
(+BV 3X12)
4 Two screws
(+PSW M4X12)
2 Handle
7 Rear cover assy
1 Four screws
(+PSW M5X20)
5 Four screws
(+BVST 4X12)
4 Two screws
(+PSW M4X12)
3 Ten screws
(+BVTP2 4X16)
Take off a screw of arrow
mark side (21pcs).
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