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KDL-32CX525/40CX525/46CX525 4

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 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).
10.  During the repair, 

DO NOT leave the Power On for more than 1 hour while the TV is face down on a cloth

.

KDL-32CX525/40CX525/46CX525 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.

KDL-32CX525/40CX525/46CX525 6

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.

4.  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).

Trouble Light

AC Outlet Box

Ohmmeter

Cold-water Pipe

Figure B. Checking for earth ground.

Figure A. Using an AC voltmeter to check AC leakage.

KDL-32CX525/40CX525/46CX525 7

The TVs 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 indicator is listed in the Operating 

Instruction manual for the user’s 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.
For complete information, refer to