SONY FDL250T - Service Manual Immediate Download

SERVICE MANUAL

MODEL

COMMANDER

DEST. CHASSIS NO.

MODEL

COMMANDER

DEST. CHASSIS NO.

MICROFILM

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

FDL-250T

2.5

LCD COLOR TV

FDL-250T

SPECIFICATIONS

TV standard

American TV standard/NTSC

Channel coverage

VHF : 2-13

UHF : 14-69

Antenna

VHF/UHF strap antenna

Display format

Transmissive type TN liquid cryatal

panel

Drive format

TFT/active matrix

Picture

2.5 inches measured diagonally

Viewable image size

49 x 36.5mm (17/8 x 1 7/16 in.)(wh)

Input

Audio/video : minijack

Audio : 500mVrms, 47k

Video : 1 Vp-p, 75-ohms, unbalanced,

sync negative

Antenna : VHF/UHF 75

(minijack)

Output

Headphones : minijack (mono)

Impedance 8-45 ohms

Power requirements

4.5 V DC

AC power adaptor compatible (not

supplied)

Power consumtion

Approx. 2.8W

Speaker

Ø28mm (1 1/8 in.), 0.1W

Temperature range

32°F-104°F (0°C-40°C)

Dimensions

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

Strap length

Approx. 1,300mm (51 1/4 in.)

Mass

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

Supplied accessories Strap adjuster

This instruction manual

Warranty

Customer Inquiry Card

Important Safeguards

Optional accessories

AC power adaptor AC-E45HG

Size AA (LR6) alkaline batteries

Design and specifications are subject to change without notice.

TABLE OF CONTENTS

Section

Title

Page

1. GENERAL

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. DISASSEMBLY

2-1.

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

2-2.

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

2-3.

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

3. CIRCUIT ADJUSTMENTS ............................................ 6

4. DIAGRAMS

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. EXPLODED VIEWS

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

6. ELECTRICAL PARTS LIST ........................................ 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.

SECTION 1

GENERAL

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)

English

Power Sources (see fig. A)

Alkaline Batteries

Use three Sony LR6 alkaline batteries (not supplied).

1 Open the display and sunshade.

2 Push and slide the battery cover open.

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

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

Battery Type

Size

Battery Life

LR6

Approx. 3.0 hours

Notes

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.

House Current

See fig. A-2.

Note

Use only the recommended Sony AC power adaptor, AC-E45HG (not supplied).

(For the polarity of the plug, see fig. A-3)

Operation (see fig. B)

1 Open the display and sunshade.

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

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

4 Adjust the volume with the VOL dial.

5 Adjust the brightness with the BRT dial.

To switch off the TV: Set the OFF/VHF/UHF

switch to OFF.

To improve the broadcast reception: Extend the strap antenna and adjust the unit's

orientation until reception is optimal.

Notes

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.

There may be poor broadcast reception in the following areas:

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.

Listening with headphones: Connect headphones (not supplied) to the i (headphones)

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

How to use the TV

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)

External Antenna Connection (see fig. C)

Connect a 75

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

reception.

AA (LR6)

× 3

to a wall outlet

Polarity of the plug

A/V IN

CH +/-

OFF/VHF/UHF

BRT

VOL

EXT ANT

Indoor antenna

external antenna cable (not supplied)

To EXT ANT

Using with Video Equipment (see fig. 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.

About the A/V IN jack

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.

To A/V IN

Camcorder

VCR

To video output

To audio output

AUDIO

VIDEO

English

Precautions

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.

Troubleshooting

efore you contact your nearest Sony dealer or authorized

service center, refer to the following troubleshooting guide.

No picture, no sound

· 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.

Good picture, no sound

· 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.

Good sound, no picture

· 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.

Snowy or indistinct picture

· Improper tuning.

· Extend the strap antenna fully.

· Adjust the strap antenna direction.

· Connect an external antenna (not supplied).

Dotted lines or stripes

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).

WARNING

To prevent fire or shock hazard, do not expose the unit to

rain or moisture.

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.

CAUTION

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.

Owner's Record

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.

SECTION 3

CIRCUIT ADJUSTMENTS

SECTION 2

DISASSEMBLY

2-1. CASE, A BOARD AND H BOARD REMOVAL

2-2. LCD CASE AND B BOARD REMOVAL

2-3. SERVICE POSITION

2 Three screws

(7-685-105-19)

3 A board

4 H board

1 Battery cover

5 Battery case (upper)

1 Hinge collar

2 LCD case (upper)

3 LCD holder

4 B board

Battery case (lower)

LCD case (lower)

Antenna

B board

Cord

AC power adaptor

CN301

CN401

CN201

J101

J601

A board

[SETUP](A BOARD )

1. Apply a DC voltage of 4.5V

±0.1V to the J601 terminal (DC

input jack) on the A board.

2. With S601 on the A board at UHF position, set the User Con-

trol RV-550(VOL) and RV-901(BRT) on the H board to their

mechanical centers.

[+5.0V ALIGNMENT (RV600)](A BOARD )

Using a digital voltmeter measuring the voltage between

JL09 (+5.0V) and JL87 (A.GND). Adjust RV600 to obtain

the value shown below.

Standard Value = 4.55V

± 0.02VDC

S601 position = UHF position

[+30.0V CHECK](A BOARD )

Check the voltage across JL07 (+30.0V) and JL87 (A.GND) .

Standard Value = 32.0V

±2.0VDC

[+7.5V CHECK](A BOARD )

Check the voltage across JL08 (+7.5V) and JL87 (A.GND) .

Standard Value = 7.0V

± 0.3VDC

[-10.0V CHECK](A BOARD )

Check the voltage across JL10 (-10.0V) and JL87 (A.GND) .

Standard Value = -9.5V

± 0.6VDC

< A BOARD ALIGNMENT >

3-1.VIF.AFT ROUGH ALIGNMENT (T201, T202)

[SETUP]

1. Set S601 on the A board to VHF position.

2. Apply no signal to JL119 (RF).

3. Connect a 1 k

resistor between JL09 (+5.0V) and

JL13 (RF AGC).

4. Apply a sweep signal across JL12 (IF) and JL14(IF GND).

(Fig. 3-1)

Note : Set the sweep signal for JL12 to -30

±5dBm. Keep the

distance to the ATT output JL12 as short as possible.

Fig. 3-2

1. Connect an oscilloscope between JL86 (VIDEO) and JL87

(A.GND) and apply an external

voltage (MGC) to JL26 to

obtain a waveform as shown in Fig. 3-2 (make sure not to

clip the extremely short portion).Adjust T202 so that the po-

sition at 45.75 MHz is the lowest point.

Note : Align JL26 (MGC) external voltage for approximately

a 1.0 Vp-p. Make sure that the JL26 (MGC) external

voltage does not exceed 4.3VDC.

2. Remove the external voltage (MGC) from JL26.

3. Connect an oscilloscope between JL02 (AFT) and JL01

(D.GND) and make a rough adjustment of T201 so that wave-

form is close to zero at the 45.75 Mhz position.

4. Remove the 1 kilohm resistor connected between JL09 (+5.0V)

and JL13 (RF AGC).

Fig. 3-1

JL12

6dB

fo=45.75MHz

±5kHz

SWEEP

MARKER

GENERATOR

0.01

µF

ATT

10Vp-p

45.75MHz

RV600

RV002

RV001

RV201

RV004

RV003

J601

DC IN JACK

J601

EXT ANT

T201

T202

- A board - (Component side)

3-7.COLOR PHASE (TINT) ALIGNMENT (RV-308)

1. Receive the color bar signal from the signal generator.

2. Observe the waveform across JL422(VB) and JL407(GND).

3. Adjust RV308 (TINT) so that the waveform level resembles

that of Fig. 3-7.

3-6.CONTRAST ALIGNMENT (RV301)

1. Receive the stepped waveform signal in 10 steps.

2. Observe the waveform across JL421(VG) and JL407(GND).

3. Align RV301 (CONT) so that 100IRE section matches the

standard below. (Fig. 3-6)

3-5.V COM ALIGNMENT (RV302, RV306)

1. Adjust BRT VR (RV901) to1.740

±0.005VDC, between

JL301(BRT) and JL307 (A.GND).

2. Observe the waveform across JL411 (V COM) and

JL407(GND).

3. Adjust RV302 (COM AMP) and RV306 (V COM DC) so that

the waveform resembles that in Fig. 3-5.

Note : The voltage at pin 37 (COMMON AMP) of IC302 shall

be a minimum of 1.8V.

3-3.RF. AGC ALIGNMENT (RV201)

1. Set S601 to VHF position and receive a VHF color bar signal

issued from a signal generator.

2. Adjust RV201 and align the screen for the optimal point so

that the snow noise disappears.

3-4.CHANNEL DiISPLAY POSITION ALIGNMENT

(RV001, RV002, RV004)

1. Set S601 to VHF position, a potentiometer (47k

±15k)

across JL06(CS) and JL09 (+5.0 V) as shown in Fig. 2-6 and

short the points JL04(CH CAL) and JL01 (D.GND).

2. Receive channel 2 and align the channel display positions with

RV002(VP).

3. Receive channel 13 and align the display bar with RV004(VA).

4. Align while performing tracking to mutual interference in the

above steps 2 and 3.

5. Receive channels 3 & 4 and confirm that the display bar is

within the standards.

6. Set S601 to UHF.

7. Receive channel 14 and align the display position with

RV001(UP).

8. Receive channel 69 and confirm that the display bar is within

the standards. If not within standards, align with RV001 so it

is within standards.

Once again receive channel 14 and confirm that the display bar

is within the standards.

Note : Use caution since shifting channel 69 will also

cause channel 14 to shift.

9. Remove the potentiometer (47k

+15k) you connected be-

tween JL06(CS) and JL09(+5.0V). Also remove the short you

connected between points JL04 (CH CAL)and JL01(D.GND).

3-2.AFT FINE ADJUSTMENT (T201)

1. Connect a 1 kilohm resistor between JL09 (+5.0V) and JL13

(RF AGC).

Note : Perform this adjustment as the last step in the

process since drift may occur due to aging.

2. Switch the sweep signal to CW.

fo= 45.75 MHz

±5 kHz, -30±5dBm

Apply the above signal between JL12 (IF) and JL14 (IF GND)

and then make a fine adjustment of T201 so that the level be-

tween JL02 (AFT) and JL01 (D.GND) reaches2.2V

±0.4VDC.

3. Remove the 1 kilohm resistor connected between JL09 (+5.0V)

and JL13 (RF AGC).

Align so the

portion is parallel and linear.

10thstep

(101IRE)

3.0V

±0.1Vp-p

5.0V

±0.1Vp-p

-1.4V

±0.1Vp-p

JL06 (CS)

JL09(+5.0V)

15k

VR(47k

)

Fig. 3-5

Fig. 3-6

Fig. 3-7

Fig. 3-4

Display bar

Channel No.

*Channel No. and display

bar are to be in line.

< B BOARD ALIGNMENT >

RV302

RV308

RV301

RV306

- B board -

(Component side)

Fig. 3-4

H board