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KDL-55X4500 (CH)     4

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.

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.

!

Replace all components with Sony parts whose part numbers
appear as shown in this manual or in supplements
published by Sony.

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.

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).

KDL-55X4500 (CH)     5

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.

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).

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).

µ

Trouble Light

AC Outlet Box

Ohmmeter

Cold-water Pipe

KDL-55X4500 (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.

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 .

2 times

POW_ERR1

AAS Board IC2104
79pin:  i_lb_err (AD port) < PW_ERR_LEV (Threshold Value)
and
138pin: i_ac_off_det: HIGH

5 times

T_CON

1

128Pin: TCON_RDY: Low

or

2

Detected Error of Cayenne Register

6 times

BACKLITE

78Pin: INV_FAIL: LOW

7 times

PANLTEMP

IIC_ch2 setting value (BEM data)

8 times

AUD_PROT

AAS Board IC2104
19pin: i_au_prot: Low

9 times

FAN_ERR

pin154: FAN_ERR: High

13 times

BALANCER

1

163pin: BALANCER_ERR: LOW

or

2

SPI_ERR_CNT (SetSREG) >= SPI_ERR_LIM (FactSREG)

Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY LED for flashing.

STANDBY 

LED

2 sec

KDL-55X4500 (CH)     7

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:

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”.

To clear the result display to “0”, press button on the remote commander sequentially as shown below when the diagnostic screen is being

displayed.

<Delection of Error Count and Error History>

Press “

8

” button   

,

   Press “

-

” button

<Delection of Panel Operation Time>

Press “

7

” button   

,

   Press “

-

” button

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

002 POW_ERR1

005 T_CON         
006 BACKLITE      
007 PANL TEMP
008 AUD_PROT
009 FAN_ERR

013 BALANCER

SELF CHECK

12345 - 00333 - 06789

0501210811 0412311234 0311111825  00

0000000000 0000000000 0000000000  00
0000000000 0000000000 0000000000  00
0000000000 0000000000 0000000000  00
0000000000 0000000000 0000000000  00
0000000000 0000000000 0000000000  00

0000000000 0000000000 0000000000  00

Item name

The last failure time
Falure time before last
Last failure time beforehand

Error count (00-99)

Frequency of LED blinking.

Total operation time by hour (max 99999)

Boot count (max 99999)

Panel operation time by hour (max 99999)

[ SELF-DIAGNOSTIC SCREEN DISPLAY ]