DOWNLOAD Sony DVP-FX740DT Service Manual ↓ Size: 2.81 MB | Pages: 48 in PDF or view online for FREE

2009H0500-1

© 2009.8

Laser: Semiconductor laser
Signal format system: PAL (NTSC)
Transmission standards: DVB-T
Digital Channel coverage: VHF/UHF

VIDEO (video output): 

Minijack
Output 1.0 Vp-p/75 ohms

Stereo minijack
Output 2.0 Vrms/47 kilohms
Recommended load impedance over 
47 kilohms

Stereo minijack

USB jack Type A (For connecting USB 
memory)

75 ohm external terminal for VHF/UHF

Panel size: 7 inches wide (diagonal)
Driving system: TFT active matrix
Resolution: 480 

× 234 (effective pixel rate: 

more than 99.99%)

DC 9.5 V (AC power Adaptor/Car battery 
adaptor)
DC 7.4 V (rechargeable battery)

7 W (when used with a headphone) 

200 

× 39.5 × 155 mm (width/height/depth) 

incl. projecting parts

Mass (approx.): 880 g
Operating temperature: 5

°C to 35 °C

Operating humidity: 25 % to 80 %
AC Power Adaptor: 110-240 V AC, 50/60 Hz
Car Battery Adaptor: 12 V DC

Specifications and design are subject to change 
without notice.

s AC power adaptor (1)
s Car battery adaptor (1)
s Audio/video cord (mini plug 

× 2 y 

phono plug 

× 3) (1)

s Remote (with battery) (1)
s Aerial (1)

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 contact high-wattage resistors.

3.  Look for unauthorized replacement parts, particularly transistors, 

that were installed during a previous repair. Point them out to 
the customer and recommend their replacement.

After correcting the original service problem, perform the following 
safety checks before releasing the set to the customer:

Unleaded solder
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with 
the lead free mark due to their particular size.)

Unleaded solder has the following characteristics.
•  Unleaded solder melts at a temperature about 40°C higher than 

ordinary solder.

  Ordinary soldering irons can be used but the iron tip has to be 

applied to the solder joint for a slightly longer time.

  Soldering irons using a temperature regulator should be set to 

about 350°C.

  Caution: The printed pattern (copper foil) may peel away if the 

heated tip is applied for too long, so be careful!

• Strong viscosity
  Unleaded solder is more viscous (sticky, less prone to flow) than 

ordinary solder so use caution not to let solder bridges occur such 
as on IC pins, etc.

•  Usable with ordinary solder
  It is best to use only unleaded solder but unleaded solder may 

also be added to ordinary solder.

CAUTION:
The use of optical instrument with this product will increase eye 
hazard.

CAUTION
Use of controls or adjustments or performance of procedures 
other than those specified herein may result in hazardous radia-
tion exposure.

COMPONENTS  IDENTIFIED  BY  MARK    OR  DOTTED  LINE  
WITH  MARK    ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  
THE  PARTS  LIST  ARE  CRITICAL  TO  SAFE  OPERATION.  RE-
PLACE  THESE  COMPONENTS  WITH  SONY  PARTS  WHOSE  
PART  NUMBERS  APPEAR  AS  SHOWN  IN  THIS  MANUAL  OR  
IN  SUPPLEMENTS  PUBLISHED  BY  SONY.

4.  Look for parts which, though functioning, show obvious signs 

of deterioration. Point them out to the customer and recommend 
their replacement.

5.  Check the B+ voltage to see it is at the values specified.

This label is located on the bottom of the unit.

This appliance is classified as a 
CLASS 1 LASER product. The 
CLASS 1 LASER PRODUCT 
MARKING is located on the 
bottom of the unit.

1. DISASSEMBLY

1-1. Disassembly 

Flow 

........................................................  

1-1

1-2.  Top Cover Block ...........................................................  1-1 
1-3.  LCD Panel Block ..........................................................  1-2
1-4. LCD 

..............................................................................  

1-2

1-5. Travers 

Unit 

..................................................................  

1-3

1-6. MAIN 

Board 

..................................................................  

1-4

1-7. ANT 

Board 

....................................................................  1-4

1-8.  Circuit Boards Location ................................................  1-5

2. 

BLOCK  DIAGRAM

2-1.  OVERALL BLOCK DIAGRAM ......................................  2-1

3. 

SCHEMATIC  DIAGRAMS

3-1.  FRAME SCHEMATIC DIAGRAM (1/3) .........................  3-1
3-2.  FRAME SCHEMATIC DIAGRAM (2/3) .........................  3-2
3-3.  FRAME SCHEMATIC DIAGRAM (3/3) .........................  3-3
3-4.  MAIN BOARD (1/7) (DC-DC POWER) .........................  3-4
3-5.  MAIN BOARD (2/7) (MCU & KEY) ...............................  3-5
3-6.  MAIN BOARD (3/7) 
 

(DVD SERVO & DSP MT1389LP) ...............................  3-6

3-7.  MAIN BOARD (4/7) (SDRAM & FLASH ROM) ............  3-7
3-8.  MAIN BOARD (5/7) (VIDEO OUT) ...............................  3-8
3-9.  MAIN BOARD (6/7) (AUDIO OUT) ...............................  3-9
3-10.  MAIN BOARD (7/7) (TUNER & ANT CONNECTOR) ...  3-10
3-11.  LCD BOARD (T_CON) .................................................  3-11
3-12.  KEY BOARD (TOUCH BOARD) ..................................  3-12
3-13.  ANT BOARD (ANTENNA) ............................................  3-13

4. 

PRINTED  WIRING  BOARDS

4-1.  MAIN Board (SIDE A) ...................................................  4-1
4-2.  MAIN Board (SIDE B)...................................................  4-2
4-3. LCD 

Board....................................................................  

4-3

4-4. KEY 

Board 

....................................................................  4-4

4-5. ANT 

Board 

....................................................................  4-5

5. 

WAVEFORMS  AND  CIRCUIT  VOLTAGE  CHECK

5-1. Waveforms 

...................................................................  

5-1

5-2.  Circuit Voltage Chart ....................................................  5-3

6. 

IC  PIN  FUNCTION  DESCRIPTION

6-1.  MPEG/DSP/RF PIN Functiom

(MAIN Board U7: MT1389LP) ......................................  6-1

7. ELECTRICAL 

 

ADJUSTMENT

7-1.  VCOM DC Level Adjustment ........................................  7-1

8. TROUBLESHOOTING

8-1.  Electrical Trouble  Shooting Guide ...............................  8-1
8-2.  LCD Trouble Shooting Guide .......................................  8-6

9. 

REPAIR  PARTS  LIST

9-1. EXPLODED 

VIEWS 

.....................................................  

9-1

  9-1-1.  Top Cover Block ......................................................  9-1
  9-1-2.  Bottom Block ...........................................................  9-2
  9-1-3.  LCD Panel Block .....................................................  9-3
9-2.  Electrical Parts List .......................................................  9-4

•  This set can be disassembled in the order shown below.

Note: Follow the disassembly procedure in the numerical order given.

1-2. TOP COVER BLOCK

(Page 1-1)

1-3. LCD PANEL BLOCK

(Page 1-2)

1-4. LCD

(Page 1-2)

1-5. TRAVERS UNIT

(Page 1-3)

1-7. ANT BOARD

(Page 1-4)

1-6. MAIN BOARD

(Page 1- 4)

SET

0

top cover block

9

KEY board harness

6

screw (TS2

× 7)

7

two screws (TS2

× 7)

5

open preve sheet

4

four screws (TS2

× 7)

1

two foot rubbers

2

two screws (TS2

× 7)

3

four screw pads

8

three screws (TS2

× 7)