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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).

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).

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9

KLV-20G300A

STEP

PICTURE

Description

Service Position

Gently place the TV set face

down on the table

Rear Cover

Removal

Remove 11 screws to release

the rear cover

Main Sheild

Removal

Remove 9 screws to release

the main shield

Stand Removal

Remove 4 screws and 1
connector to release the

Tabletop Stand from the unit

A (Main) Board

Assy and G

(Inverter/Power)

Board Assy

Removal

Remove FFC cable, 6 angle

nut, 5 screws and 4

connectors to release the A

(Main) Board.

Remove 7 screws and 8

connectors to release the G

(Inverter/Power) Board Assy.

10

KLV-20G300A

STEP

PICTURE

Description

Bracket Removal

Remove 2 screws to release

the Bracket

H2 Board (IR

LED) Removal

Remove 2 screws and 1

connector to release the H2

Board

H3 Board

(Earphone)

Removal

Remove 1 screw and 1

connector to release the H3

Board

Bezel Removal

Remove 11 screws and 5

location of connector lock to

release the Front Bezel.

Main Frame

Removal

Remove 4 screws to release

the Main Frame from LCD

Panel.

11

KLV-20G300A

         

To adjust various set features, use the Remote Commander to put the set into service mode to display 

the Service menue. 

(Input the signal to TV set. Please confirm that there is no OSD before enter the service mode)

1)  Press “←” button

2)  Press “→” button 

4)  Press “Enter” button

5)  Press “MUTING” button 

6)  Press “MENU” button 

To exit "SERVICE MODE”, press the “MENU” button

,

3)  Press “MUTING” button 

←

→

Muting

Enter

MENU

Sample picture of“SERVICE MODE”

INPUT SOURCE

Component 1

WHITE BALANCE

Default is "OFF", when you adjust white balance, change it to "ON”

N"

COLOR TEMPERTURE

Color mode change menu (COOL, NUTRAL, WARM)

R GAIN
G GAIN
B GAIN

R OFFSET
G OFFSET
B OFFSET

White balance adjustment resister, refer to WB adjust procedure

Description of Service Mode menu for adjustment.  Do not use other menu.
Before to do White Balance adjustment please press remote control“1” to turn“Alignment On”.
To turn “Alignment Off”press remote control“2”.
To save aligned data, please AC off the TV set. And automatically turn “Alignmet Off”.

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KLV-20G300A