DOWNLOAD Sony KDL-26NL140 / KDL-32NL140 / KDL-37NL140 Service Manual ↓ Size: 29.24 MB | Pages: 102 in PDF or view online for FREE

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.

The units in this manual contain a self-diagnostic function. If an error occurs, the TIMER/PIC OFF LED indicator will automatically begin to fl ash. The 
number of times the LED fl ashes translates to a probable source of the problem. A defi nition of the TIMER/PIC OFF LED fl ash 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 TIMER/PIC OFF LED indicator will fl ash a set number of times to indicate the possible cause of the problem. If there is more 
than one error, the indicator will identify the fi rst of the problem areas.

POWER LED

Green LED

* Light is green when the TV set is on

STANDBY LED

Red LED

* Light is red when the TV set is in PC standby mode.
* Light is amber when the timer is set.
* Light is green when the Backlight feature is activated.
* Blinks red when indicating the TV may need servicing

TIMER/PIC OFF

LED

Amber/Green/Red LED

Main Power

 2 times

BM Board
G1D Board (26" & 32")
G2D Board (37")

DC Alert 1

3 times

BM Board

DC Alert 2

4 times

BM Board

DC Alert 3

5 times

BM Board

Backlight

6 times

BM Board
G1D Board (26" & 32")
G2D Board (37")
ETC-Inverter MT Board
LCD Panel

Temp

7 times

BM Board
Check Ventilation

Audio

8 times

BM Board
G1D Board (26" & 32")
G2D Board (37")

1.  TV must be in standby mode. (Power off).

2.  Press the following buttons on the Remote Commander within a second of each other: 

 

DISPLAY   

Channel 

5   

Volume 

+  

  TV POWER .

 

The Self Check list displays. 

          

  This is the SAME as accessing Service Adjustments.

Results for all of the following diagnostic items are displayed at the bottom of the screen. No error has occurred if the screen displays a “0”.

CAUTION: To remove the error indicator number you have to reset the settings back to the Factory Defaults. This action over-writes all customer 
settings. Before performing this reset, contact the customer to determine what adjustments they have made.  

1.  Using the remote commander, select Factory Default button.

2.  To reset the Diagnostic List, select Yes.

3.  To start Auto Program, select Yes.  NOTE: Allow 30+ minutes for Auto Program to complete.

4.  Using the customers information, reset their adjustments.

☛

1   Remove 2 screws from Terminals
2   Remove 5 screws (KDL-26NL140 ONLY)

 

Remove 1 screw (KDL-32NL140 ONLY)

 

Remove 4 screws (KDL-37NL140 ONLY)

3   Remove 20 screws

1   Remove from bezel
2   Disconnect 1 connector

2

3

Rear Cover

1

Bezel

Switch Unit (Contains H1 Board)

1

2