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KDL-46/52HX900,903,905(AEP/UK)

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Use the following precautionary guidelines when replacing the Glass Assembly to avoid material degradation or screen coating degradation, and 
ensure that dust, dirt, or fingerprints are not left between the glass and the LCD panel.

• Replace the Glass Assembly in a brightly lit and clean room.

• Place the replacement Glass Assembly on a dark cloth to make it easier to see dust and dirt particles.

• Wear anti static gloves to avoid leaving finger prints on the glass.

• Use a dry, soft Micro Fiber cloth, such as a lint free polishing cloth, to gently wipe the glass to remove any dust or dirt particles.

• If the glass needs additional cleaning, slightly moisten the cloth with a diluted mild soap or mild detergent solution, or use a compressed 

air duster (spray can type).

• After replacing the Glass Assembly, verify there are no dark spots or finger prints visible on the screen.

• Do Not use paper towels, any type of abrasive pad, rags, rubber or vinyl materials to clean the screen. Using these materials could easily 

scratch the screen which may result in permanent damage.

• Do Not use any cleaning product containing alkaline/acid cleaner, scouring powder, or volatile solvent, such as alcohol, ammonia, 

benzene, thinner or insecticide. Using any of these harsh cleaners may result in permanent damage to the screen.

• Do Not spray water or detergent directly onto the TV screen . If liquid drips into the bottom of the screen it may cause a failure.

KDL-46/52HX900,903,905(AEP/UK)

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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.

8. For safety reasons, repairing the Power board and/or Inverter board is prohibited.

KDL-46/52HX900,903,905(AEP/UK)

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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).

KDL-46/52HX900,903,905(AEP/UK)

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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 .

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.

2

MAIN_POWE

Main Power Over Voltage Protection

DC_ALERT

DC_ALERT

DTT_WDT

DTT Error

AUD_PROT

Audio Abnormal Detection

4

BALANCER_

Panel Balancer Error

TCON_ERR

T-CON Error

HFR_ERR

HFR Error

P_ID_ERR

Panel ID NVM Error

6

BACKLITE_

Back Light Error (Panel Inverter)

TEMP_ERR

Thermal Error

-

RGB sensor I2C Error

FAN_ERR

FAN Error (Not Detected. Display Only)

8

-

Not used

9

-

Not used

10

-

Not used

11

-

Not used

12

-

Not used

-

RGB_SEN

RGB Sensor ACK Error

3

5

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