Akai PDP4273L, PDP4273M Service Manual

AKAI

SERVICE MANUAL

Model: PDP4273M

L

1. Safety Precaution............................................................................................................1~2

2. Technical Specifications.................................................................................................3~9

3. Circuit Diagram................................................................................................................10~3 2

4. Basic Operations & Circuit Description........................................................................33—35

5. Main IC Information....................................................................................................... 36

6. Panel Information............................................................................................................37—66

7. Spare Pare List................................................................................................................67—70

8. Exploded View................................................................................................................71

9. If you forget your V-Chip Password..............................................................................72

10. Software Upgrade............................................................................................................73—76

This manual is the latest at the time of printing, and does not Include the modification which may be made after the printing, By the constant improvement of product.

1

Safety Precaution

CAUTION

RISK OF ELECTRIC SHOCK

A

DO NOT OPEN

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY.

A

The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage" within the product’s enclo sure that may be of sufficient magnitude to constitute a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

P R E C A U TIO N S D U RIN G

S ER V IC IN G

In addition to safety, other parts and assemblies are specified for conformance with such regulations as those applying to spurious

radiation. These must also be replaced only

with specified replacements.

Examples: RF converters, tuner units, antenna selection switches, RF cables, noise-blocking capacitors, noise-blocking filters, etc.

2,

Use specified internal Wiring. Note especially:

1) Wires covered with PVC tubing

2) Double insulated wires

3) High voltage leads

3,

Use specified insulating materials for hazardous

live parts. Note especially:

1) Insulating Tape

2) PVC tubing

3) Spacers (insulating barriers)

4) Insulating sheets for transistors

5) Plastic screws for fixing micro switches

4.

When replacing AC primary side components

(transformers, power cords, noise blocking capacitors, etc.), wrap ends of wires securely about the terminals before soldering.

' A

O O Q

5. Make sure that wires do not contact heat generating parts (heat sinks, oxide metal film

resistors, fusible resistors, etc.)

6. Check if replaced wires do not contact sharply edged or pointed parts.

7. Make sure that foreign objects (screws, solder droplets, etc.) do not remain inside the set.

M A K E Y O U R C O N T R IB U T IO N

T O P R O T E C T T H E

E N V IR O NM E N T

Used batteries with the ISO symbol

<59

for recycling as well as small accumulators (rechargeable batteries), mini-batteries (cells) and starter batteries should not be thrown into the garbage can.

Please leave them at an appropriate depot.

W A R N IN G :

Before servicing this TV receiver, read the SAFETY INSTRUCTION and PRODUCT SAFETY NOTICE.

S A F E TY IN S TR U C T IO N

The service should not be attempted by anyone unfamiliar with the necessary instructions on this apparatus. The following are the necessary instructions to be observed before servicing.

1. An isolation transformer should be connected in the power line between the receiver and the AC line when a service is performed on the primary of the converter transformer of the set.

2. Comply with all caution and safety related provided on the back of the cabinet, inside the cabinet, on the chassis or picture tube.

3. To avoid a shock hazard, always discharge the picture tube's anode to the chassis ground before removing the anode cap.

4. Completely discharge the high potential voltage of the picture tube before handling. The picture tube is a vacuum and if broken, the glass will explode.

2

5. When replacing a MAIN PCB in the cabinet, always be certain that all protective are installed properly such as control knobs, adjustment covers or shields, barriers, isolation resistor networks etc.

6. When servicing is required, observe the original lead dressing. Extra precaution should be given to assure correct lead dressing in the high voltage area.

7. Keep wires away from high voltage or high tempera ture components.

8. Before returning the set to the customer, always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as antennas, terminals, screwheads,metal overlay, control shafts, etc., to be sure the set is safe to operate without danger of electrical shock. Plug the AC line cord directly to the AC outlet (do not use a line isolation transformer during this check). Use an AC voltm eter having 5K ohms volt sensitivity or more in the following manner. Connect a 1.5K ohm 10 watt resistor paralleled by a 0.15pF AC type capacitor, between a good earth ground (water pipe, conductor etc.,) and the exposed metallic parts, one at a time. Measure the AC voltage across the combination of the 1.5K ohm resistor and 0.15 uF capacitor. Reverse the AC plug at the AC outlet and repeat the AC voltage measurements for each exposed metallic part. The measured voltage must not exceed 0.3V RMS. This corresponds to 0.5mA AC. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately. The resistance measurement should be done between accessible exposed metal parts and power cord plug prongs with the power switch "ON". The resistance should be more than 6M ohms.

AC V OLT METER

P R O D U C T S A F E T Y N O T IC E

Many electrical and mechanical parts in this apparatus have special safety-related characteristics.

These characteristics are offer passed unnoticed by visual spection and the protection afforded by them cannot necessarily be obtained by using replacement components rates for a higher voltage, wattage, etc.

The replacement parts which have these special safety characteristics are identified by A marks on the schematic diagram and on the parts list.

Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement parts which do not have the same safety characteristics as specified in the parts list may create shock, fire, or other hazards.

9. Must be sure that the ground wire of the AC inlet is connected with the ground of the apparatus properly.

etc.

AC Leakage Current Check

3

Technical Specifications PDP4273M

1. Standard Test Conditions

All tests shall be performed under the following conditions, unless otherwise specified

1.1 Ambient light : 150ux (When measuring lB, the ambient luminance S0.1Cd/m2)

1.2 Viewinq distance : 50cm in front of PDP

1.3 Warm up time : 30 minutes

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1.4

PDP Panel facina :

no restricted

1.5 Measuring Eguipment : Minolta CA 100 photometer

1.6 Magnetic field : no restricted

1.7 Control settings : Brightness, Contrast, Tint, Color set at Center(50)

1.8 Power input : 120Vac, 60Hz

1.9 Ambient temperature : 20°C ± 5°C (68°F ± 9°F)

1.10 Display mode : Resolution 1024 (H) x 768 (V) Pixels

1.11 Other conditions :

1.11.1 With image sticking protection of PDP module, the luminance will descend by time on a same still screen and rapidly go down in 5 minutes. When measuring the color tracking and luminance of a same still screen, be sure

to accomplish the measurement in one minute to ensure its accuracy.

1.11.2 Due to the structure of PDP, the extra-high-bright same screen should not hold over 5 minutes for fear of branding on the panel.

4

5ó7

Technical Specifications PDP4273M

12. Remote Control

CD Standby(<&): Press this button to turn off to

standby and turn on from standby.

system. Press again to reactivate the sound system.

(3) Number buttons: Use these buttons to enter

the password.

® PIP POS. : Press the button to select different

Image Position in PIP Mode.

(D Source: Press this button and use A / ▼

button to select the signal sources. AV, S-Video, YPbPr 1, YPbPr 2, VGA or HDMI.

time, such as “15 Min, 30 Min, 60 Min, 90 Min, 120 Min or off’.

E) Swap: Press this button to switch the Main

window or Sub window pictures in PIP and Split Screen.

decrease the volume.

® P. Mode : Press the button to select different

picture effect, such as “Normal, Vivid, Hi-Bright, User or Cinema”.

® System: Press this button to select the color

system, such as “AUTO or NTSC 3.58”. 0 PIP: Press this button to enter PIP function. @ Enter : Press to enter or confirm.

< / ► : They are used as < / ► buttons in

the OSD Menu screen.

▲ / T : They are used as ▲ / T buttons in

the OSD Menu screen. ® Exit: Press this button to exit the OSD Menu. @ Menu: Press this button to pop up the OSD

Menu and press it again to exit the OSD Menu. (HI V-Chip: Press this button to enter the V-Chip

Function. (Only for AV or S-Video) QD Freeze: Press this button to hold on the screen. Press again to normal.

07) C/C: Press this button to enter the Closed Caption Function. (Only for AV or S-Video)

Display: Press the button to display the source information.

HD S. Mode: Press the button to select different sound effect, such as “Normal, News,

Cinema, Concert or User”. @ P. Size: Press this button, the picture will change according to Full, 4:3 or Panoramic,

(inactive for VGA)

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8

Technical Specifications PDP4273M

13. Support the Signal Mode

A. VGA Mode

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B. YPbPr Mode

Resolution

640 x 480

Horizontal

Frequency

(KHz)

31.50 60.00

37.86 72.81

Vertical

Frequency

(Hz)

35.16 56.25

800 x 600

37.90

46.90

60.32

75.00

48.08 72.19

1024x768 48.40 60.00

Resolution

Horizontal

Frequency

(KHz)

Vertical

Frequency

(Hz)

480i 15.734 59.94

480p(720x480) 31.468 59.94

720p(1280x720) 45.00 60.00

1080i(1920x1080)

33.75

60.00

C.HDMI Mode

Resolution

Horizontal

Frequency

(KHz)

Vertical

Frequency

(Hz) 480p 31.468 59.94 720p 45.00 60.00

1080i 33.75 60.00

- When the signal received by the Display exceeds the allowed range, a warning message shall appear on the screen.

- You can confirm the input signal format from the on-screen.

9

Technical Specifications PDP4273M

PHYSICAL CHARACTERISTICS

14. Power Cord

L

Length

Type

1.8m nominal

optional

15. Cabinet

15.1 Color : “Black” colour as defined by colour plaque reference number

15.2 Weight

Net weight : 40.5 kg(with stand, speaker and handles) Gross weight : 47.0 kg

15.3 Dimensions(w/o stand)

Width : 1039.8 mm

Height : 719.9 mm Depth : 109.5 mm

10

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Circuit Diagram

- Main (Video) board

- Keypad board

- Remote control receiver board

• External L/R Speakers board

- Remote control board

12131415161718

19

DVO POWER CONTROL

ZhongShan KAWA Electronic Inc.

£4 Ml ( ffqf ldmnaJ

202122232425262728293G