Sony KLV-22BX205, KLV-32BX200, KLV-26BX200, KLV-26BX205, KLV-37BX205 Service Manual

CEF85B75C8FE03FE27E5B2DD5FD4FC586E1158C26A977376619C854F45DFDC1CD6D620D8336B9157

AZ1-FM CHASSIS

Segment: 5-3

SERVICE MANUAL

HISTORY INFORMATION FOR THE FOLLOWING MANUAL:

ORIGINAL MANUAL ISSUE DATE: 12/2009

Version Date Subject

1.0 12/2009 No revisions or updates are applicable at this time.

1.1 4/2010 Correction part number of A board for KLV-26BX200/205. (P.10)

1.2 7/2010 Correction part number of SWITCH UNIT. (P.10, P.13)

1.3 8/2010 Addition of new models (KLV-22BX205/KLV-37BX205)

LCD Digital Color TV

9-888-267-04

CEF85B75C8FE03FE27E5B2DD5FD4FC586E1158C26A977376619C854F45DFDC1CD6D620D8336B9157

SERVICE MANUAL

LCD Digital Color TV

AZ1-FM CHASSIS

Segment: 5-3

9-888-267-04

CEF85B75C8FE03FE27E5B2DD5FD4FC586E1158C26A977376619C854F45DFDC1CD6D620D8336B9157

KLV-22/26/32/37BX200,205(CH)

3

MODEL LIST

MODEL COLOR COMMANDER DEST.MODEL COLOR COMMANDER DEST.

KLV-22BX205 Black RM-SA020 China
KLV-26BX200 Brown RM-SA020 China
KLV-26BX205 Black RM-SA020 China
KLV-32BX200 Brown RM-SA020 China
KLV-32BX205 Black RM-SA020 China
KLV-37BX205 Black RM-SA020 China

CEF85B75C8FE03FE27E5B2DD5FD4FC586E1158C26A977376619C854F45DFDC1CD6D620D8336B9157

KLV-22/26/32/37BX200,205(CH)

4

WARNINGS AND CAUTIONS -ENGLISH

CAUTION

These servicing instructions are for use by qualified service personnel only.

To reduce the risk of electric shock, do not perform any servicing other than that contained in the operating instructions unless you are qualified to
do so.

WARNING!!

An isolation transformer should be used during any service to avoid possible shock hazard, because of live chassis.

The chassis of this receiver is directly connected to the ac power line.

CARRYING THE TV

Be sure to follow these guidelines to protect your property and avoid causing serious injury.

• Carry the TV with an adequate number of people; larger size TVs require two or more people.

• Correct hand placement while carrying the TV is very important for safety and to avoid damages.

SAFETY-RELATED COMPONENT WARNING!!

Components identified by shading and ! mark on the schematic diagrams, exploded views, and in the parts list are critical for safe operation.
Replace these components with Sony parts whose part numbers appear as shown in this manual or in supplements published by Sony. Circuit
adjustments that are critical for safe operation are identified in this manual. Follow these procedures whenever critical components are replaced or
improper operation is suspected.

CEF85B75C8FE03FE27E5B2DD5FD4FC586E1158C26A977376619C854F45DFDC1CD6D620D8336B9157

KLV-22/26/32/37BX200,205(CH)

5

WARNINGS AND CAUTIONS

USE CAUTION WHEN HANDLING THE LCD PANEL

When repairing the LCD panel, be sure you are grounded by using a wrist band.

When repairing the LCD panel on the wall, the LCD panel must be secured using the 4 mounting holes on the rear cover.

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 (CCFL) 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) It is recommended not to exceed 1 hour of Power-On nor Burn-in period with LCD panel face down condition, in repair activity.

CEF85B75C8FE03FE27E5B2DD5FD4FC586E1158C26A977376619C854F45DFDC1CD6D620D8336B9157

KLV-22/26/32/37BX200,205(CH)

6

SAFETY CHECK-OUT

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.

CEF85B75C8FE03FE27E5B2DD5FD4FC586E1158C26A977376619C854F45DFDC1CD6D620D8336B9157

KLV-22/26/32/37BX200,205(CH)

7

SAFETY CHECK-OUT

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).

CEF85B75C8FE03FE27E5B2DD5FD4FC586E1158C26A977376619C854F45DFDC1CD6D620D8336B9157

KLV-22/26/32/37BX200,205(CH)

8

SELF DIAGNOSIS FUNCTION

DIAGNOSTIC TEST INDICATORS

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.

STBY LED

Fla sh tim e

Se rvic e m enu Ite m nam e

(Screeen Dsisplay)

Diagnostic Item Description

6Inverter_ERR

When The connection to the Inverter board
is not proper, or the inverter board has
som ething wrong.("Inverter_ERR")

8AU PROT

When the connections of the speaker has
DC level difference("AU PROT") Or Main
Am p has the Over Current or High
temperature status ("Amp_ERR").

CEF85B75C8FE03FE27E5B2DD5FD4FC586E1158C26A977376619C854F45DFDC1CD6D620D8336B9157

KLV-22/26/32/37BX200,205(CH)

9

SELF DIAGNOSIS FUNCTION

DISPLAY OF STANDBY LED FLASH COUNT

SELF-DIAGNOSTIC SCREEN DISPLAY

For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confirmed, it is possible to bring up
past occurrences of failure for confirmation on the screen:

[To Bring Up Screen Test]

In standby mode, press buttons on the remote commander sequentially in rapid succession as shown below:

Exiting the Self-diagnostic screen

To exit the Self Diagnostic screen, turn off the power to the TV by pressing the POWER button or MENU button on the remote or the POWER
button on
the TV.