DOWNLOAD Sony KDL-32L4000 / KDL-37L4000 Service Manual ↓ Size: 14.06 MB | Pages: 66 in PDF or view online for FREE

The circuit boards used in these models have been processed using
Lead Free Solder. The boards are identified by the LF logo located
close to the board designation e.g. H1 etc [ see example ]. The
servicing of these boards requires special precautions to be taken as
outlined below.

It is strongly recommended to use Lead Free Solder material in order to guarantee optimal quality of new solder joints. 
Lead Free Solder is available under the following part numbers :

Due to the higher melting point of Lead Free Solder the soldering iron tip temperature needs to be set to 370 degrees centigrade. 
This requires soldering equipment capable of accurate temperature control coupled with a good heat recovery characteristics.

For more information on the use of Lead Free Solder, please refer to  http://www.sony-training.com

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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.

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).

Trouble Light

AC Outlet Box

Ohmmeter

Cold-water Pipe

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

Figure B. Checking for earth ground.

IMPORTANT: 
The units in this manual DO NOT contain a self-diagnostic function. If an error occurs, the TV will not stay on. It is our recommendation that if a repair 
is required for these sets, the technician should bring both the A Board and the G Board to the customer location.

The units in this manual DO NOT contain a self-diagnostic function. 

NOTE: The Rear Cover of both models is attached to the Bezel Assembly with 4 small tabs. 

    

Use caution when removing the Rear Cover not to damage these tabs.

1   Remove 6 screws from terminals, +BVTP 3X12 TYPE2 IT-3
2   Remove 3 screws, +PSW M4X8 (KDL-32L4000 ONLY)

 

Remove 4 screws, +PSW M5X8 (KDL-37L4000 ONLY)

3   Remove 2 screws, +PSW M5X12 (KDL-37L4000 ONLY)
4   Remove 17 screws +BVTP2 4X16(KDL-32L4000 ONLY), 

 

18 screws +BVTP2 4X16 (KDL-37L4000 ONLY) 

1   Remove from bezel
2   Disconnect 1 connector
3   Remove 5 screws, +B 2X6 TYPE 2
4   Remove 1 screw, +PSW M3X5 and release Earth Connector 

(KDL-32L4000 ONLY)

 

Remove 1 screw, +BVST 3X8 and release Earth Connector 
(KDL-37L4000 ONLY)

Rear Cover

Tab Inserts

2

4

1

3

Bezel

Button Bracket

Button

H1 Board

1

2

3

4