Sony Klv-26bx320 User manual

AZ2FM CHASSIS

Segment: P-2F

SERVICE MANUAL

Version Date Subject

1.0 12/2010 Original manual issue.

LCD Digital Color TV

9-888-380-01

KLV-26/32/37/40BX320,321,323,325,420,421,423,425(CH) 2

MODEL LIST

MODEL COLOR COMMANDER DEST.MODEL COLOR COMMANDER DEST.

KLV-26BX320 Black RM-SA020 China

KLV-32BX320 Black RM-SA020 China

KLV-32BX321 Black/Black RM-SA020 China

KLV-32BX323 Black/Brown RM-SA020 China

KLV-32BX325 Black/Gun Metallic RM-SA020 China

KLV-37BX320 Black RM-SA020 China

KLV-40BX420 Black RM-SA020 China

KLV-40BX421 Black/Black RM-SA020 China

KLV-40BX423 Black/Brown RM-SA020 China

KLV-40BX425 Black/Gun Metallic RM-SA020 China

KLV-26/32/37/40BX320,321,323,325,420,421,423,425(CH) 3

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.

KLV-26/32/37/40BX320,321,323,325,420,421,423,425(CH) 4

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.

KLV-26/32/37/40BX320,321,323,325,420,421,423,425(CH) 5

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.