FDL-250T - Sony TV Service Manual (repair manual)

MODEL

COMMANDER

DEST. CHASSIS NO.

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MODEL

COMMANDER

DEST. CHASSIS NO.

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MICROFILM

∗

 Please file according to model size. .......

FDL-250T

US

2.5

– 2 –

American TV standard/NTSC

VHF : 2-13
UHF : 14-69

VHF/UHF strap antenna

Transmissive type TN liquid cryatal
panel

TFT/active matrix

2.5 inches measured diagonally

49 x 36.5mm (1

7

/8 x 1 

7

/16   in.)(wh)

Audio/video : minijack
  Audio : 500mVrms, 47k

Ω

  Video : 1 Vp-p, 75-ohms, unbalanced,
               sync negative
Antenna : VHF/UHF  75

Ω

 (minijack)

Headphones : minijack (mono)
Impedance  8-45 ohms

4.5 V DC
AC power adaptor compatible (not
supplied)

Approx. 2.8W

Ø28mm (1 

1

/

8

 in.), 0.1W

32˚F-104˚F (0˚C-40˚C)

Closed : Approx. 90 x 109 x 71.7mm
(3 

9

/

16

 x 4 

5

/

16

 x 2 

13

/

16

 in.)(w/h/d)

Fully opened :
     Approx. 90 x 194 x 71.7mm
     (3 

9

/

16

 x 7 

3

/

4

 x 2 

13

/

16

 in.)(w/h/d)

                                             excl. projecting parts and controls

Approx. 1,300mm (51 

1

/

4 

 in.)

Approx. 360g (12.7oz), excl. batteries

Strap adjuster
This instruction manual
Warranty
Customer Inquiry Card
Important Safeguards

AC power adaptor AC-E45HG
Size AA (LR6) alkaline batteries

Design and specifications are subject to change without notice.

Section

Title

Page

Power Sources (see fig. A) ...................................................... 3
Operation (see fig. B) .............................................................. 3
External Antenna Connection (see fig. C) ............................... 3
Using with Video Equipment (see fig. D) ............................... 4
Precsutions .............................................................................. 4
Troubleshooting ...................................................................... 4
WARNING .............................................................................. 4

2-1.

Case,A board and H board Removal ............................ 5

2-2.

LCD Case and B board Removal ................................. 5

2-3.

Service Position ............................................................ 5

............................................ 6

4-1. Block diagram .................................................................. 8
4-2. Circuit Boards Location ................................................. 11
4-3. Printed Wiring Boards and Schematic Diagrams ........... 11

• A  Board ....................................................................... 12
• B  Board ....................................................................... 16
• H  Board ....................................................................... 20

4-4. Semiconductors .............................................................. 21

5-1. Chassis Section .............................................................. 22

........................................ 23

(CAUTION)

SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND THE AN-

ODE CAP TO THE METAL CHASSIS, CRT SHIELD, OR CARBON PAINT-

ED ON THE CRT, AFTER REMOVING THE ANODE.

WARNING!!

AN ISOLATION TRANSFORMER SHOULD BE USED DURING ANY SER-

VICE TO AVOID POSSIBLE SHOCK HAZARD, BECAUSE OF LIVE CHAS-

SIS.

THE CHASSIS OF THIS RECElVER IS DIRECTLY CONNECTED TO THE

AC POWER LINE.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY SHADING AND MARK ! ON THE SCHE-

MATIC DIAGRAMS, EXPLODED VIEWS AND IN THE PARTS LIST ARE

CRITICAL TO SAFE OPERATION. REPLACE THESECOMPONENTS

WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN

THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY. CIRCUIT

ADJUSTMENTS THAT ARE CRITICAL TO SAFEOPERATION ARE IDEN-

TIFIED IN THIS MANUAL. FOLLOW THESE PROCEDURES WHENEV-

ER CRITICAL COMPONENTS ARE REPLACED OR IMPROPER OPERA-

TION IS SUSPECTED.

– 3 –

The operating instructions mentioned here are partial abstracts from the
Operating Instructions Manual. The page numbers of the Operating
Instruction Manual remain as in the manual. (Part no : 3-867-899-11)

A

b

1

    English

A

Use three Sony LR6 alkaline batteries (not supplied).

Open the display and sunshade.

Push and slide the battery cover open.

Insert three batteries. Be sure to insert the (-) polarity of each battery first as illustrated.

  With continuous use, Sony LR6 alkaline batteries will last about 3.0 hours.

  LR6

AA

 Approx. 3.0 hours

•

When the picture becomes dim or the tuning does not lock onto a channel, replace all the
batteries with new ones.

•

Switch off the TV and remove the batteries from the unit if the TV will not be used for a
long period of time to avoid battery leakage. Also, be sure to remove dead batteries from the
unit.

See fig. A-2.

Use only the recommended Sony AC power adaptor, AC-E45HG (not supplied).
 (For the polarity of the plug, see fig. A-3)

B

Open the display and sunshade.

Set the OFF/VHF/UHF switch to VHF or UHF, according to the band you want to watch.

Press the CH +/- button to select a channel.

Adjust the volume with the VOL dial.

Adjust the brightness with the BRT dial.

 Set the OFF/VHF/UHF

 switch to OFF.

  Extend the strap antenna and adjust the unit’s

orientation until reception is optimal.

•

Grasp the unit as shown in fig. B-1 so that your fingers are not pinched when opening the
display and sunshade.

•

You can open the display and sunshade to about 190

°

. Do not force it open further.

•

Faraway from the broadcasting station, or behind a mountain or tall building.

•

Inside a train or car, etc.

•

Where there is strong interference, such as near a high tension wire, neon sign, or radio
station.

•

Near a railway line or expressway, or under air traffic routes.

•

In underground shopping centers, tunnels, or solid buildings.

  Connect headphones (not supplied) to the i (headphones)

jack. The sound is heard from both sides of the headphones, but the sound is monaural.

First, place the adjuster on the strap as shown on the left, then adjust to a confortable position
and wear the TV around your neck. You can adjust the length of the strap. (See fig. B-2)
You can also place the TV on a flat surface using the supplied adjuster as a tilt stand. Attach the
adjuster to the rear of the unit. (See fig. B-3)

C

Connect a 75 

Ω

 external antenna cable (not supplied) to the TV. This will improve the TV’s

reception.

×

2

3

B

1

2

3

C

i

1

2

Ω

1

2

– 4 –

D

D

Connect video equipment (such as VCR or camcorder) to the unit using an audio/video cable
(miniplug 

y phono plug) (not supplied).

When you connect an audio/video cable to the unit, the unit automatically selects the input only
from the video equipment.
After connecting, start playback on the video equipment connected to the unit.

The A/V IN jack is a minijack, and the signal connections are aligned as shown on the left. This
alignment may be opposite depending on the equipment.
In such case (if no sound is heard and no picture is seen), connect the video plug to the audio
output jack, and the audio plug to the video output jack of the equipment.

    English

    English

•

Use the recommended Sony AC power adaptor,

AC-E45HG (not supplied). Do not use any other type of
AC power adaptors for this unit.

• Do not open the unit. Refer servicing to qualified

personnel only.

• Do not place the unit in a hot or humid place, or in a place

subject to excessive dust or vibration.

• Avoid rough handling.
• Clean the unit with a soft cloth slightly dampened with a

mild detergent solution. Never use strong solvents, such as
thinner or benzine, as they may damage the finish.

• Do not touch the AC power adaptor with wet hands. Doing

so may cause an electric shock.

• Do not touch the external antenna cord or AC power

adaptor during stormy weather. Doing so may result in an
electric shock.

• Do not use while driving, walking or engaging in any

activity where full attention is required.

• Keep out of reach of children. Strap antenna could cause

strangulation.

• When opening the display, be careful not to pinch your

fingers in the hinge. Also, be careful that the sunshade
does not close on your fingers while viewing.

B

efore you contact your nearest Sony dealer or authorized

service center, refer to the following troubleshooting guide.

• The AC power adaptor is disconnected.
• Incorrect battery polarity.
• Weak batteries. Replace all the batteries with new ones.
• The external antenna is disconnected.
• The video equipment is not connected properly.

• Turn the VOL dial to the + direction.
• The headphones are connected.
• Weak batteries. Replace all the batteries with new ones.
• The video equipment is not connected properly.

• Weak batteries. Replace all the batteries with new ones.
• Increase the brightness by turning the BRT dial toward the

+ direction.

• The video equipment is not connected properly.

• Improper tuning.
• Extend the strap antenna fully.
• Adjust the strap antenna direction.
• Connect an external antenna (not supplied).

Often caused by interference from other electrical appliances
such as a hair dryer, car, or motorcycle.
• Relocate the strap antenna away from the source of

interference.

• Extend the strap antenna fully.
• Connect an external antenna (not supplied).

This symbol is intended to alert the user to the
presence of uninsulated “dangerous voltage” within the
product

’

s enclosure that may be of sufficient magnitude

to constitute a risk of electric shock to persons.

This symbol is intended to alert the user to the
presence of important operating and maintenance
(servicing) instructions in the literature accompanying
the appliance.

This device complies with part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) This device must accept any interference received, including

interference that may cause undesired operation.

You are cautioned that any changes or modifications not expressly
approved in this manual could void your authority to operate this
equipment.

The model and serial numbers are located at the front side. Record the
serial number in the space provided below. Refer to these numbers
whenever you call upon your Sony dealer regarding this product.
Model No.  FDL-250T   Serial No.