SONY KV27V42 Service Manual

SERVICE MANUAL

MODEL COMMANDER DEST CHASSIS NO.

BA-4D CHASSIS

KV-27V42 KV-27V66 KV-27V66 KV-29SL42K KV-29SL42T KV-29VL42T KV-29XL42T

RM-Y165 US SCC-S27M-A RM-Y167 US SCC-S27J-A RM-Y167 CND SCC-S28H-A RM-Y149A KOREA SCC-S29A-A RM-Y165 TAIWAN SCC-S30A-A RM-Y165 TAIWAN SCC-S30B-A RM-Y165 TAIWAN SCC-S30C-A

MICROFILM

KV-29SL42K

RM-Y149A

TRINITRON® COLOR TV

KV-27V42/27V66/29SL42K/29SL42T/29VL42T/29XL42T

SPECIFICATIONS

KV-27V42,

KV-29SL42T KV-27V66 KV-29SL42K

AUTO VOLT

Power Requirements 120V, 60Hz 120V, 60Hz Number of inputs/outputs

Video

S-Video Input

Audio Input

Audio Out

Speaker Output (W) 5WX2 10WX2 5WX2 5WX2

Power Consumption (W)

In Use (Max) 140W 180W 140W 140W

In Standby 2W 2W 2W 2W

Dimensions (W/H/D)

(mm) 690 x 575.4 x 503.4 mm 690 x 575.4 x 503.4 mm 690 x 575.4 x 503.4 mm 690 x 575.4 x 503.4 mm

(in)

Mass

3322

1111

3322

1111

/4x223/4x197/8in. 271/4x223/4x197/8in. 271/4x223/4x197/8in. 271/4x223/4x197/8in.

120-220V,

50-60Hz 120V, 60Hz

KV-29VL42T, KV-29XL42T

(kg) 42.4kg 42.4kg 42.4kg 42.4kg

(lbs) 93 lbs.8oz 93 lbs.8oz 93 lbs.8oz 93 lbs.8oz

Television system

American TV standard/NTSC

Picture T ube

Trinitron

tube

1 Vp-p 75 ohms unbalanced, sync negative

Y: 1Vp-p 75 ohms unbalanced, sync negative.

C: 0.286 Vp-p (Burst signal), 75 ohms

500mVrms (100% modulation), impedance:47 kilohms

More than 408 mVrms at the maximum volume setting

(variable) Morethan 408 mVrms(fix),Impedance: 5 kilohms

Channel coverage

VHF:2-13/UHF:14-69/CATV:1-125

Visible screen size

27" picture measured diagonally

Actual screen size

29" picture measured diagonally

Antenna

75 ohm external terminal for VHF/UHF

Supplied Accessories

Remote Commander (RM-Y165) (KV-27V42/29SL42T/29VL42T/29XL42T) Remote Commander (RM-Y167) (KV-27V66) Remote Commander (RM-Y149A) (KV-29SL42K)

(•) SRS (SOUND RETRIEVAL SYSTEM)

Size AA (R6) batteries (2)

Optional Accessories

Dipole antenna Connecting cables VMC-810S/820S, VMC-720M, YC-15V/30V, RK74A U/V mixer EAC-66

Design and specifications are subject to change without notice.

The (•) SRS (SOUND RETRIEVAL SYSTEM) is manufactured by Sony Corporation under license from SRS Labs, Inc. It is covered by U.S. Patent No. 4,748,669. Other U.S. and foreign patents pending.

The word ‘SRS’ and the SRS symbol (•) are registered trademarks of SRS Labs, Inc.

BBE and BBE symbol are trademarks of BBE Sound, Inc. and are licensed by BBE Sound, Inc. under U.S. Patent No. 4,638,258 and 4,482,866.

— 2 —

KV-27V42/27V66/29SL42K/29SL42T/29VL42T/29XL42T

Section Title Page

Warnings and Cautions............................................................................................................................................................... 4

Self-Diagnostic Function ............................................................................................................................................................. 4

Safety Check Out Instructions .................................................................................................................................................... 7

1. GENERAL ............................................................................................................................................................8

2. DISASSEMBLY

2-1. Rear Cover Removal (KV-27V42/66/29VL42T) .............................................................................................................. 11

2-2. Rear Cover Removal (KV-29SL42K/42T/29XL42T)........................................................................................................ 11

2-3. Board Removal...............................................................................................................................................................12

2-4. Control Switch Removal ................................................................................................................................................. 12

2-5. Service Position ............................................................................................................................................................. 12

2-6. Picture Tube Removal .................................................................................................................................................... 13

3. SET-UP ADJUSTMENTS

3-1. Beam Landing ................................................................................................................................................................ 14

3-2. Convergence .................................................................................................................................................................. 15

3-3. Focus ............................................................................................................................................................................. 16

3-4. Screen (G2) ................................................................................................................................................................... 16

3-5. Method of Setting the Service Adjustment Mode............................................................................................................. 16

3-6. White Balance Adjustments ........................................................................................................................................... 16

4. SAFETY RELATED ADJUSTMENTS

4-1. R584 Confirmation Method (HV Hold-Down Confirmation and Readjustments).........................................................17

4-2. B+ Voltage Confirmation and Adjustment........................................................................................................................ 17

5. CIRCUIT ADJUSTMENTS

5-1. Setting the Service Adjustment Mode ............................................................................................................................. 19

5-2. Memory Write Confirmation Method ............................................................................................................................... 19

5-3. Adjust Buttons and Indicators......................................................................................................................................... 19

5-4. A Board Adjustment s ..................................................................................................................................................... 22

6. DIAGRAMS

6-1. Block Diagram ............................................................................................................................................................... 23

6-2. Circuit Board Location .................................................................................................................................................... 26

6-3. Printed Wiring Boards and Schematic Diagrams............................................................................................................ 26

• A Board ..................................................................................................................................................................... 27

• P Board ..................................................................................................................................................................... 35

• K Board ..................................................................................................................................................................... 36

• HV Board .................................................................................................................................................................. 37

• E Board ..................................................................................................................................................................... 39

• C Board..................................................................................................................................................................... 40

• CV Board .................................................................................................................................................................. 41

6-4. Semiconductors ............................................................................................................................................................. 43

7. EXPLODED VIEW

7-1. Chassis (KV-29SL42K/42T/XL42T) ............................................................................................................................... 44

7-2. Chassis (KV-27V42/V66/29VL42T)................................................................................................................................45

8. ELECTRICAL P ARTS LIST................................................................................................................................................. 46

— 3 —

KV-27V42/27V66/29SL42K/29SL42T/29VL42T/29XL42T

WARNINGS AND CAUTIONS

CAUTION

SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND THE ANODE CAP TO THE METAL CHASSIS, CRT SHIELD, OR CARBON PAINTED ON THE CRT, AFTER REMOVING THE ANODE.

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.

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.

ATTENTION

APRES AVOIR DECONNECTE LE CAP DE L'ANODE, COURT-CIRCUITER L'ANODE DU TUBE CATHODIQUE ET CELUI DE L'ANODE DU CAP AU CHASSIS METALLIQUE DE L'APPAREIL, OU AU COUCHE DE CARBONE PEINTE SUR LE TUBE CATHODIQUE OU AU BLINDAGE DU TUBE CATHODIQUE.

ATTENTION!!

AFIN D'EVITER TOUT RESQUE D'ELECTROCUTION PROVENANT D'UN CHÁSSIS SOUS TENSION, UN TRANSFORMATEUR D'ISOLEMENT DOIT ETRE UTILISÉ LORS DE TOUT DÉPANNAGE. LE CHÁSSIS DE CE RÉCEPTEUR EST DIRECTEMENT RACCORDÉ À L'ALIMENTATION SECTEUR.

ATTENTION AUX COMPOSANTS RELATIFS A LA SECURITE!!

LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET PAR UNE MARQUE SUR LES SCHEMAS DE PRINCIPE, LES VUES EXPLOSEES ET LES LISTES DE PIECES SONT D'UNEIMPORTANCE CRITIQUE POUR LA SECURITE DU FONCTIONNEMENT. NE LES REMPLACER QUE PAR DES COMPOSANTS SONY DONT LE NUMERO DE PIECE EST INDIQUE DANS LE PRESENT MANUEL OU DANS DES SUPPLEMENTS PUBLIES PAR SONY. LES REGLAGES DE CIRCUIT DONT L'IMPORTANCE EST CRITIQUE POUR LA SECURITE DU FONCTIONNEMENT SONT IDENTIFIES DANS LE PRESENT MANUEL. SUIVRE CES PROCEDURES LORS DE CHAQUE REMPLACEMENT DE COMPOSANTS CRITIQUES, OU LORSQU'UN MAUVAIS FONTIONNEMENT SUSPECTE.

SELF-DIAGNOSTIC FUNCTION

The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER 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/TIMER 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.

Diagnostic Test Indicators

When an error occurs, the STANDBY/TIMER 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.

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

Diagnostic Item

Description

Power does not turn on Does not light

+B overcurrent (OCP)* 2 times 2:0 or 2:1 • H.OUT (Q50 2) is sh orted (A Board)

Vertical def lec t ion stopped* 4 times 4:0 or 4:1 • +13V is not supplied. (A Board)

White balance f ailure (not balanced)

No. of Tim e s

STANDBY/TIMER

LED Flashes

5 times 5:0 or 5:1 • Video OUT (Q306 to 308) is fault y. (A Board)

Self-diagnostic Display/

Diagnostic Result

Probable Cause

Location

• Power cord is not pl ugged in.

• Fuse F5050 is burned out (E board).

• IC1751 (C board) or IC 1701(CV Board) are shorted.

• IC541 is faulty. (A Board)

• IC301 is faulty. (A Board)

• Screen (G2) is improperly adj us te d. **

Detected Symptoms

• Power does not co me on.

• No power is supplied to th e TV.

• AC power supply is f aulty.

• Power does not co me on.

• Load on power line is shorted.

• Has entered standby state after horizontal raster.

• Vertical deflection pulse is stopped.

• Power line is shorted or power supply is s t opped.

• No raster is generated.

• CRT cathode current detec t ion referenc e pulse output is small.

* If a +B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously.

The symptom that is diagnosed first by the microcontroller is displayed on the screen.

** Refer to Screen (G2) Adjus tments in Section 3-4 of this manual.

— 4 —

KV-27V42/27V66/29SL42K/29SL42T/29VL42T/29XL42T

STANDBY/TIMER LED

Display of Standby/Timer LED Flash Count

2 times 4 times 5 times

LED ON 0.3 sec. LED OFF 0.3 sec.

Diagnostic Item Flash Count*

+B overcurrent 2 times Vertical deflection stopped 4 times White balance failure 5 times

*One flash count is not used for self-diagnostic.

LED OFF

3 sec.

Stopping the Standby/Timer LED Flash

Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY/TIMER LED from flashing.

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 on the screen for confirmation.

To Bring Up Screen Test

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

Display Channel

Self Diagnostic Screen Display

SELF DIAGNOSTIC

2: 0 3: N/A 0 4: 0 5: 1 101: N/A 0

Sound volume

Numeral “0” means that no fault was detected.

Numeral “1” means a fault was detected one time only.

Power ON

Note that this differs from entering the service mode (sound volume

— 5 —

KV-27V42/27V66/29SL42K/29SL42T/29VL42T/29XL42T

Handling of Self-diagnostic Screen Display

Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen during repairs. When you have completed the repairs, clear the result display to “0”.

Unless the result display is cleared to “0”, the self-diagnostic function will not be able to detect subsequent faults after completion of the repairs.

Clearing the Result Display

To clear the result display to “0”, press buttons on the Remote Commander sequentially when the diagnostic screen is displayed, as shown below:

ENTERChannel

Quitting the Self-Diagnostic Screen

To quit the entire self-diagnostic screen, turn off the power switch on the Remote Commander or the main unit.

Self-diagnostic Circuit

FROM

CRT

FROM

IC521 PIN 7

IC301

Y/CHROMA JUNGLE

IK IN

HP/PROTECT

SDA

IC541

V. OUT

REF

IC001

SYSTEM

IO-BDAT

O-LED

I-PROT

IO-SDAT

DISPLAY

IC003

MEMORY

B-DAT

+B overcurrent (OCP) Occurs when an overcurrent on the +B (115V) line is detected by pin 18 of IC301. If the voltage

of pin 18 of IC301 is less than 1V when V.SYNC is more than seven verticals in a period, the unit will automatically turn off.

V ertical deflection stopped Occurs when an absence of the vertical deflection pulse is detected by pin 17 of IC001. Power

supply will shut down when waveform interval exceeds 2 seconds.

White balance failure If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be

detected by IC301. TV will stay on, but there will be no picture.

*(Refers to the RGB levels of the AKB detection Ref pulse that detects 1K.)

— 6 —

SAFETY CHECK-OUT

Trouble Light

AC Outlet Box

Ohmmeter

Cold-water Pipe

KV-27V42/27V66/29SL42K/29SL42T/29VL42T/29XL42T

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 B+ and HV to see if they are specified values. Make sure your instruments are accurate; be suspicious of your HV meter if sets always have low HV.

8. Check the antenna terminals, metal trim, “metallized” knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below.

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 microampere). 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 milliammeter. 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 coverplate 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 coldwater 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).

To Exposed Metal Parts on Set

AC Voltmeter (0.75 V)

Earth Ground

Figure B. Checking for earth ground.Figure A. Using an AC voltmeter to check AC leakage.

— 7 —

KV-27V42/27V66/29SL42K/29SL42T/29VL42T/29XL42T

SECTION 1

GENERAL

The following are partial abstracts from the Operating Instruction Manual. The page numbers shown reflect those of the Operating Instruction Manual.

Connecting Your TV

This section covers basic connections in addition to any optional

equipment you may be connecting.

Basic Connections

TV with indoor or outdoor antenna, or CATV cable

Depending on the cable available in your home, choose one of the

connections below:

✍

If you are connecting to an indoor or outdoor antenna, it will be necessary to adjust the orientation of the antenna for best reception.

Cable and antenna

KV-27S66, 27V66 only

If your cable provider does not feature local channels, you may find this

set up convenient.

✍

CATV cable

(No connection “TO CONVERTER” in this case)

Antenna cable

Select CABLE or ANT mode by pressing on the remote control.

(Rear of TV)

AUX

TO CONVERTER

VHF/UHF

User Guide

Connecting Additional Equipment

TV and VCR

From Cable/ antenna

VCR must be connected and turned on to operate PIP. (KV-27S46 only)

Connect the coaxial cable from your TV antenna or cable TV to the IN

jack on your VCR.

Connect a coaxial cable (not supplied) from the OUT jack on your

VCR to the VHF/UHF IN jack on the TV.

✍

To watch video programs from your VCR, tune your TV to channel 3 or 4 (as set on the rear of your VCR).

(Optional connection)

If your VCR is equipped with video inputs, for better picture quality

you should connect A/V cables to AUDIO and VIDEO OUT on your

VCR to AUDIO/VIDEO IN on your TV. You can use the button

to switch between the TV and VCR inputs.

✍

For optimum picture quality, use S VIDEO instead of the yellow A/V cable. S VIDEO does not provide sound, the audio cables must still be connected.

VCR

(Optional connection)

Connecting Your TV

TV and Cable Box

Connect the coaxial cable from the wall to the IN jack on your cable

box.

Connect a coaxial cable (not supplied) from the OUT jack on your

cable box to the VHF/UHF IN jack on the TV.

✍

To view channels from your cable box, tune your TV to channel 3 or 4 (as set on the rear panel of your cable box).

✍

If you will be controlling all channel selection through your cable box, you should consider using the CHANNEL FIX feature on page24.

3 4

User Guide

TV, Cable box and Cable

KV-27S66 , 27 V6 6 onl y

For this set up, you can switch between scrambled channels (through

your cable box), and normal (CATV) channels by pressing on your

remote control.

✍

When using PIP, the AUX input cannot be viewed in the window picture.

(Rear panel KV-27V66 only)

5 6

— 8 —

KV-27V42/27V66/29SL42K/29SL42T/29VL42T/29XL42T

Connecting Your TV

TV, VCR, and Cable box

Connect the coaxial cable from the wall to the IN jack on your cable

box.

Connect a coaxial cable (not supplied) from the OUT jack on your

cable box to the IN jack on your VCR.

Connect a coaxial cable (not supplied) from the OUT jack on your

VCR to the VHF/UHF IN jack on the TV.

(Optional connection)

If your VCR is equipped with video inputs, for better picture quality

you should connect A/V cables to AUDIO and VIDEO OUT on your

VCR to AUDIO/VIDEO IN on your TV. You can use the button

to switch between the TV and VCR inputs.

✍

If you will be controlling all channel selection through your cable box, you should consider using the CHANNEL FIX feature on page24.

✍

For optimum picture quality, use S VIDEO instead of the yellow A/V cable. S VIDEO does not provide sound, the audio cables must still be connected.

Cable

(Optional connection)

Cable box

VCR

User Guide

TV and Digital Satellite Receiver

Connect the cable from your satellite antenna to SATELLITE IN on

the satellite receiver.

Attach the coaxial connector from your cable or antenna to

VHF/UHF IN on your TV.

Using A/V connectors, connect AUDIO and VIDEO OUT on your

satellite receiver to AUDIO and VIDEO IN on your TV. You can use

the button to switch between the satellite receiver and the TV.

✍

For optimum picture quality, use S VIDEO instead of the yellow A/V cable. S VIDEO does not provide sound, your audio connectors must still be connected.

Satellite receiver

Satellite antenna cable

From cable/ antenna

Connecting Your TV

TV, Digital Satellite Receiver and VCR

Connect the cable from your satellite antenna to SATELLITE IN on

the satellite receiver.

Attach the coaxial connector from your cable or antenna to

VHF/UHF IN on your VCR.

Using a coaxial cable, connect VHF/UHF OUT on your VCR to

VHF/UHF IN on your TV.

Using A/V connectors, connect AUDIO and VIDEO OUT on your

satellite receiver to AUDIO and VIDEO IN on your VCR.

Using A/V connectors, connect AUDIO and VIDEO OUT on your

VCR to AUDIO and VIDEO IN on your TV.

✍

To view from the satellite or VCR, select the video input to which your satellite receiver or VCR is connected by pressing on the remote control.

Satellite receiver

Cable

VCR

Satellite antenna

User Guide

Connecting a Camcorder

Using A/V cables, connect AUDIO and VIDEO OUT on your camcorder

to AUDIO and VIDEO IN on your TV.

Connecting a DVD Player

Using A/V connectors, connect LINE OUT on your DVD to VIDEO IN

on your TV.

✍

Connection can also be made to the rear A/V panel of your TV.

✍

For optimum picture quality, use S VIDEO instead of the yellow A/V cable. S VIDEO does not provide sound, your audio connectors must still be connected.

(Front A/V Panel KV-27V42, 27V66 only)

A/V output

A/V outputs

(Rear of TV)

(Rear of DVD player)

— 9 —

KV-27V42/27V66/29SL42K/29SL42T/29VL42T/29XL42T

Connecting Your TV

Connecting an audio system

Using audio connectors, connect AUDIO OUT on your TV to one of the

unused line inputs (e.g. TV, AUX, TAPE 2) on your stereo.

AUDIO-L

AUDIO-R

Line

input

✍

Set your stereo to the chosen line input. (See page 20 for additional audio setup instructions.)

User Guide

Connecting two VCRs for Tape Editing

KV-27V42, 27V66 only

MONITOR OUT gives you the ability to use a second VCR to record a

program being played by the primary VCR to perform tape editing.

(Rear panel KV-27V66 only)

VCR (for playback)

Connect the VCR intended for playback using the setup instructions

on page 4 of this manual.

Using A/V connectors, connect AUDIO and VIDEO IN on your VCR

intended for recording to MONITOR AUDIO and VIDEO OUT on

your TV.

✍

To perform tape editing; set the TV to the video input intended for playback by pressing

on the remote control

VCR (for recording)

User Guide

Troubleshooting

If you are having a problem with your TV, try the suggestions below. If

the problem persists, contact your nearest Sony dealer.

Cannot operate single tuner PIP (KV-27S46)

No picture, no sound

Poor or no picture, good sound

Good picture, no sound

No color ❏ Adjust COLOR in the VIDEO menu (page 19). Only snow

appears on the screen

❏ Make sure the VCR is connected correctly (see page 4). ❏ Check to see if the VCR is on. ❏ Make sure your remote control is programmed to

operate your VCR (see page 31).

❏ Make sure the power cord is plugged in. ❏ If a red light is flashing on the front of your TV for

more than a few minutes, call your local service center.

❏ Check the TV/VIDEO settings: when watching TV, set

to TV; when watching video equipment, set to VIDEO

(page 19).

❏ Make sure the batteries have been inserted correctly

into the remote control.

❏ Check your PARENTAL CONTROL settings (pages

28-29).

❏ Try another channel, it could be station trouble. ❏ Adjust PICTURE in the VIDEO menu (page 19). ❏ Adjust BRIGHTNESS in the VIDEO menu (page 19). ❏ Check the antenna and/or cable connections (page 3). ❏ Press so that MUTING disappears from the

screen (page 13).

❏ Check your AUDIO settings. Your TV may be set to

SAP (page 21).

❏ Check the CABLE setting in the CHANNEL SET UP

menu (page 24).

❏ Check the antenna and/or cable connections (page 3). ❏ Make sure the channel selected is currently

broadcasting.

❏ Press the button on the remote control.

Other Information

Dotted lines or stripes

Double images or ghosts

Cannot receive higher number channels (UHF) when using an antenna

Cable stations

don’t seem to work

Remote Control does not operate

The TV needs to be cleaned

Lost password for PARENTAL CONTROL

If, after reading these operating instructions, you have additional questions related to the use of your Sony television, please call our Direct Response Center at 1-800-222-SONY (7669) (U.S. residents only) or (416) 499-SONY (7669) (Canadian residents only).

❏ Adjust the antenna. ❏ Move the TV away from other electronic equipment.

Some electronic equipment can create electrical noise,

which can interfere with TV recepti on.

❏ Check your outdoor antenna or call your cable service.

❏ Make sure CABLE is set to OFF in the CHANNEL SET

UP menu (page 24).

❏ Use AUTO PROGRAM to add channels that are not

presently in the memory (page 24).

❏ Make sure CABLE is set to ON in the CHANNEL SET

UP menu (page 24).

❏ Use AUTO PROGRAM to add channels that are not

presently in the memory (page 24).

❏ Batteries could be weak. Replace them (pa ge 2). ❏ Move the TV 3-4 feet away from fluoresc ent lights.

❏ Clean the TV with a soft dry cloth. Never use strong

solvents such as thinner or benzine, which might

damage the finish of the cabinet.

❏ In the password screen, enter the following master

password: 4357. After using the master password, you

must create a new password, it cannot be used to

unlock currently blocked channels.

— 10 —

SECTION 2

DISASSEMBLY

2-1. REAR COVER REMOV AL (KV-27V42/66/29VL42T)

Rear Cover

KV-27V42/27V66/29SL42K/29SL42T/29VL42T/29XL42T

Seven screws (+BVTP 4x16 TYPE2 N-S)

Seven screws (+BVTP 3x10 TYPE 2 IT3)

2-2. REAR COVER REMOV AL (KV-29SL42K/42T/29XL42T)

Rear Cover

— 11 —

Seven screws (+BVTP 4x16 TYPE2 N-S)

Two screws (+BVTP 3x10 TYPE 2 IT3)

KV-27V42/27V66/29SL42K/29SL42T/29VL42T/29XL42T

2-3. CHASSIS ASSEMBLY REMOVAL

CV (C) board

K board P board

A board

E board

2-4. CONTROL SWITCH REMOVAL (KV-27V42/66/29VL42T)

Control Switch

Four Claws

2-5. SERVICE POSITION

HV board

P board

K board

A board

CV (C) board

E board

— 12 —

2-6. PICTURE TUBE REMOVAL

KV-27V42/27V66/29SL42K/29SL42T/29VL42T/29XL42T

WARNING:

BEFORE REMOVING

THE ANODE CAP

High voltage remains in the CRT even after the power is disconnected.

To avoid electric shock, discharge CRT before attempting to remove the anode cap. Short between anode and CRT coated earth ground strap.

Coated Earth Ground Strap

Degaussing coil

Tension spring (B)

C (CV) board

Deflection yoke Four tapping

screws

Anode cap

Picture tube

Two Screws

Two speaker boxes (KV-27V42/66/29VL42T ONLY)

E board

HV board (KV-27V42/66/29VL42T)

Cushion

A board Tuners

K board (KV-27V66 ONLY)

P board (KV-27V66 ONLY)

ANODE CAP REMOV AL

WARNING: High voltage remains in the CRT even after the power is disconnected. To avoid electrical shock, discharge the CRT before

NOTE: After removing the anode, short circuit the anode of the picture tube and the anode cap to either the metal chassis, CRT shield,

attempting to remove the anode cap. Short between anode and coated earth ground strap of CRT.

or carbon painted on the CRT.

REMOVAL PROCEDURES

Anode Button

Turn up one side of the rubber cap in the direction indicated by arrow

Use your thumb to pull the rubber

cap firmly in the direction indicated by arrow

When one side of the rubber cap separates from the anode button, the anode cap can be removed by turning the rubber cap and pulling it in the direction of arrow

HOW TO HANDLE AN ANODE CAP

Do not use sharp objects which may cause damage to the surface of the anode cap.

To avoid damaging the anode cap, do not squeeze the rubber covering too hard. A material fitting called a shatter-hook terminal is built into the rubber.

Do not force turn the foot of the rubber cover. This may cause the shatter-hook terminal to protrude and damage the rubber.

— 13 —

KV-27V42/27V66/29SL42K/29SL42T/29VL42T/29XL42T

SET -UP ADJUSTMENTS

SECTION 3

The following adjustments should be made when a complete realignment is required or when a new picture tube is installed.

These adjustments should be performed with rated power supply voltage unless otherwise noted.

Set the controls and switch as follows unless otherwise noted.

PICTURE control................. Normal

BRIGHTNESS control......... Normal

3-1. BEAM LANDING

Before beginning adjustment procedure:

1. Degauss the entire screen.

2. Feed in the white pattern signal.

Adjustment Procedure

1. Input a raster signal with the pattern generator.

2. Loosen the deflection yoke mounting screw and set the purity control to the center as shown below.

Perform the adjustments in order as follows:

1. Beam Landing

2. Convergence

3. Focus

4. Screen (G2)

5. White Balance

Note: Test equipment required:

• Color bar pattern generator

• Degausser

• DC power supply

• Digital multimeter

Purity Control

3. Turn the raster signal of the pattern generator to green.

4. Move the deflection yoke backward and adjust the purity control so that green is in the center and red and blue are at the sides evenly.

Blue Red

Green

5. Move the deflection yoke forward and adjust so that the entire screen becomes green.

6. Switch over the raster signal to red and blue then confirm the condition.

7. When the position of the deflection yoke is determined, tighten it with the deflection yoke mounting screw.

8. If landing at the corner is not right, adjust by using the disk magnets.

Purity control

corrects this area

Deflection yoke positioning

corrects these areas

Disk magnets or rotatable disk magnets correct

these areas (a-d)

— 14 —

KV-27V42/27V66/29SL42K/29SL42T/29VL42T/29XL42T

3-2. CONVERGENCE

Before starting convergence adjustments:

1. Perform FOCUS, V.LIN AND V.SIZE adjustments.

2. Set BRIGHTNESS control to minimum.

3. Feed in dot pattern.

Vertical Static Convergence

1. Adjust V.STAT magnet to converge red, green and blue dots in the center of the screen (vertical movement).

Center dot

R G B

V.STAT magnet

If the blue dot does not converge with the red and green dots, perform the following:

1. Move BMC magnet (a) to correct insufficient H. Static convergence.

2. Rotate BMC magnet (b) to correct insufficient V. Static convergence.

3. In either case, repeat Beam Landing Adjustment.

PURITY

V. STAT

BMC MAGNET

BMC magnet

2. Tilt the V.STAT magnet and adjust static convergence to open or close the V.STAT magnet.

When the V.STAT magnet is moved in the direction of arrows

and , red, green, and blue dots move as shown

below:

(1)

(2) a

(3)

B G

BGR

RGB

B G

Dynamic Convergence Adjustment

Before performing this adjustment, perform Horizontal and Vertical Static Convergence Adjustment.

1. Slightly loosen deflection yoke screw.

2. Remove deflection yoke spacers.

3. Move the deflection yoke for best convergence, as shown below:

BGR

RGB

BGR

4. Tighten the deflection yoke screw.

5. Install the deflection yoke spacers.

— 15 —

R G B

B G R

RGB

B G R

R G B

BGR RGB

+ 34 hidden pages

SONY KV27V42 Service Manual

SPECIFICATIONS

TABLE OF CONTENTS

GENERAL

DISASSEMBLY