Philips PET-944 Service Manual

DVD Portable Player PET944

All version

Service Manual

©Copyright 2005 Philips Consumer Electronics B.V. Eindhoven, The Netherlands
All rights reserved. No part of this publication may by reproduced, stored in a
retrieval system or transmitted, in any form or by any means, electronics,
mechanical, photocopying, or otherwise without the prior permission of Philips

Published by BU AVM – BL Printed in the Netherlands Subject to modification 3141 785 33752

TABLE OF CONTENTS

Chapter

Technical Specification & Service Tips…………..……….. 1
Safety Instructions…………………………………………….. 2
Instruction for Use……………………………………………… 3
Mechanical Instructions………………………………………. 4
Troubleshooting …………………………………………………5
Overall Block Diagram…………………………………………. 6
Electrical Diagram……………………………………………… 7
Service Part List………………………………...………………. 8
Revision List……………………………………………………. 9

Version 1.2

1.0 TECHNICAL SPECIFICATION

General

Dimensions (W x H x D): 240 x 178.5x 34.8 mm
Bear Unit Weight: 1.1kg
Power supply:
Supply voltage AC 100~240V (adapter)

Supply Power
consumption
Operating Temp & RH 0~ 45degC / 30-90%

Audio System
Output voltage 1kHz: 2V +/-0.2V
THD 20-20kHz (%):

Dynamic range 1kHz >/=80dB
Signal/Noise ratio: >/=85dB
Frequency response (20­20kHz):
Channel Separation 1kHz >=80dB
Channel Balance 1kHz < 1dB

Current consumption

DC Supply
Standby Power off
Battery
Voltage

Capacity
Battery playtime
Charging time(Power off)
Standby Power off

Headphone out (headphone output load 2x16 ohm)

Maximum output power:
Frequency response:
SNR (A-wght):
THD (w/16 ohm loading):
Left-Right Channel
Separation:
Left-Right Channel
Balance:

Supported disc type

Video
Playback
Formats:

Audio
Playback
Formats:

>40dB

<3.0dB

14.0W

≤1%

+/-1dB

DC6.3V-15.5V
<0.45W

≤6.3V
3500mAH

8h

<0.45W

>1.5mW
+/-1dB
>62dB

1.0%

Playback disc type: CD,+/-R/ RW,DVD
DVD+/-R/RW
Video Playback Format: DVD / VCD/DivX,
JPEG image

Audio Playback Format: CD/MP3,DVD,WMA
Disc Diameter 8/12cm

Pixel specification

Max. 0 bright-dot & max. 3 dark-dots

1.0 TECHNICAL SPECIFICATION

Factory Service Mode (FSM)

Procedure to change region code of your DVD
Portable

1. Power on the DVD player and do not insert
DISC inside player

2. Press the key or IR in the sequence as

9 -> 6 -> 5 -> 3
The LCD display showed th e existing region
code.

3. Press
down) repeatedly to select the number from 0
to 6.

4. Then press OK to confirm your region code.

5. Refer below table for your region code setting

(navigatio n u p ) or (navigation

Procedure for SW upgrade

1. Download the “PHILIPS.AP” file from the
Philips support site

2. Unzip the file,Drag-n-drop to SD card drive

3. Power on PET944 with AC/DC adapter

4. Insert the SD card drive to SD card port of
the main set

5. The set will detect the upgraded SW

6. Press “OK” t o con f i r m and proceed

7. The set will reset once finished upgrade

Warning: Do not unplug the AC adapter
during firmware upgrade to prevent flash
corrupt of the set!!

Procedure to check SW version of your DVD
Portable

1. Power on the DVD player and no insert DISC

2.

Press the remote button in the sequence as
3->3->0->8,then a menu will be show XX­YYYY-MM-DD

2.0 SAFTETY INSTRUCTIONS

WARNING

GB

All ICs and many other semi-conductors are
susceptible to electrostatic discharges (ESD).
Careless handling during repair can reduce life
drastically.
When repairing, make sure that you are
connected with the same potential as the mass
of the set via a wrist wrap with resistance.
Keep components and tools also at this
potential.

F

ATTENTION

Tous les IC et beaucoup d’autres
semi-conducteurs sont sensibles aux
décharges statiques (ESD).
Leur longévité pourrait être considérablement
écourtée par le fait qu’aucune précaution n’est
prise à leur manipulation.
Lors de réparations, s’assurer de bien être relié
au même potentiel que la masse de l’appareil et
enfiler le bracelet serti d’une résistance de
sécurité.
Veiller à ce que les composants ainsi que les
outils que l’on utilise soient également à ce
potentiel.

ESD

D

WARNUNG

Alle ICs und viele andere Halbleiter sind
empfindlich gegenüber elektrostatischen
Entladungen (ESD).
Unsorgfältige Behandlung im Reparaturfall kan
die Lebensdauer drastisch reduzieren.
Veranlassen Sie, dass Sie im Reparaturfall über
ein Pulsarmband mit Widerstand verbunden
sind mit dem gleichen Potential wie die Masse
des Gerätes.
Bauteile und Hilfsmittel auch auf dieses gleiche
Potential halten.

WAARSCHUWING

NL

Alle IC’s en vele andere halfgeleiders zijn
gevoelig voor electrostatische ontladingen
(ESD).
Onzorgvuldig behandelen tijdens reparatie kan
de levensduur drastisch doen verminderen.
Zorg ervoor dat u tijdens reparatie via een
polsband met weerstand verbonden bent met
hetzelfde potentiaal als de massa van het
apparaat.
Houd componenten en hulpmiddelen ook op
ditzelfde potentiaal.

I

AVVERTIMENTO

Tutti IC e parecchi semi-conduttori sono
sensibili alle scariche statiche (ESD).
La loro longevità potrebbe essere fortemente
ridatta in caso di non osservazione della più
grande cauzione alla loro manipolazione.
Durante le riparazioni occorre quindi essere
collegato allo stesso potenziale che quello della
massa dell’apparecchio tramite un braccialetto
a resistenza.
Assicurarsi che i componenti e anche gli utensili
con quali si lavora siano anche a questo
potenziale.

GB

Safety regulations require that the set be restored to its original
condition and that parts which are identical with those specified,
be used.

NL

Veiligheidsbepalingen vereisen, dat het apparaat bij reparatie in
zijn oorspronkelijke toestand wordt teruggebracht en dat onderdelen,
identiek aan de gespecificeerde, worden toegepast.

F

Les normes de sécurité exigent que l’appareil soit remis à l’état
d’origine et que soient utiliséés les piéces de rechange identiques
à celles spécifiées.

D

Bei jeder Reparatur sind die geltenden Sicherheitsvorschriften zu
beachten. Der Original zustand des Geräts darf nicht verändert werden;
für Reparaturen sind Original-Ersatzteile zu verwenden.

I

Le norme di sicurezza esigono che l’apparecchio venga rimesso
nelle condizioni originali e che siano utilizzati i pezzi di ricambio
identici a quelli specificati.

“Pour votre sécurité, ces documents
doivent être utilisés par des spécia­listes agréés, seuls habilités à réparer
votre appareil en panne”.

CLASS 1

LASER PRODUCT

GB

Warning !

Invisible laser radiation when open.
Avoid direct exposure to beam.

S

Varning !

Osynlig laserstrålning när apparaten är öppnad och spärren
är urkopplad. Betrakta ej strålen.

Varoitus !

SF

Avatussa laitteessa ja suojalukituksen ohitettaessa olet alttiina
näkymättömälle laserisäteilylle. Älä katso säteeseen!

3122 110 03420

"After servicing and before returning set to customer perform a
leakage current measurement test from all exposed metal parts to
earth ground to assure no shock hazard exist. The leakage current
must not exceed 0.5mA."

DK Advarse !

Usynlig laserstråling ved åbning når sikkerhedsafbrydere er
ude af funktion. Undgå udsaettelse for stråling.

2.1 ESD PROTECTION

Whenthepowersupplyisbeingturnedon,youmaynotremovethislasercautionslabel.Ifitremoves,radiationoflaser

maybereceived.

PREPARATIONOFSERVICING

PickupHeadconsistsofalaserdiodethatisverysusceptibletoexternalstaticelectrocity.

Althoughitoperatesproperlyafterreplacement,ifitwassubjecttoelectrostaticdischargeduringreplacement,

itslifemightbeshortened.Whenreplacing,useaconductivemat,solderingironwithgroundwire,etc.to

protectthelaserdiodeformdamagebystaticelectricity.

Andalso,theLSIandICaresameasabove.

Groundconductive
wriststrapforbody.

Solderingiron
withgroundwire
orceramictype

1M

Conductivemat

Thegroundresistance
betweenthegroundline
andthegroundislessthan10

SAFTY NOTICE

LEAKAGE CURRENT CHECK

SAFTY PRECAUTIONS

Plug the AC line cord directly into a 120V AC outlet (do

not use an isolation transformer for this check). Use an

AC voltmeter, having 5000 per volt or more sensitivity.

Connect a 1500 10W resistor,paralleled by a 0.15uF

150V AC capacitor between a knomn good earth ground

(water pipe, conduit, etc.) and all exposed metal parts of

cabinet (antennas, handle bracket, metal cabinet

screwheads, metal overlays, control shafts, etc.).

READING SHOULD NOT EXCEED 0.3V

DVD VIDEO PLAYER

Measure the AC voltage across the 1500 resistor.

The test must be conducted with the AC switch on and

then repeated with the AC switch off. The AC voltage

indicated by the meter may not exceed 0.3V.A reading

exceeding 0.3V indicates that a dangerous potential

exists, the fault must be located and corrected.

Repeat the above test with the DVD VIDEO PLAYER

power plug reversed.

NEVER RETURN A DVD VIDEO PLAYER TO THE

CUSTOMER WITHOUT TAKING NECESSARY

CORRECTIVE ACTION.

AC VOLTMETER

(5000 per volt
or more sensitivity)

Good earth ground

1500
10W

such as a water pipe,
conduit, etc.

AC OUTLET

0.15uF 150V AC

Test all exposed metal.
Voltmeter Hook-up for Leakage Current Check

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 enclosure 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.

3.0 INSTRUCTION FOR USE

3.0 INSTRUCTION FOR USE

4.0 MECHANICAL INSTRUCTION

Disassembly Procedure on PET944

Remove eleven screws on back
cabinet to separate top cabinet and
back cabinet.

Generally open the front cabinet.

screws 11pcs

Remove four screws and disassemble
the connecter on the Main board.

Remove six screws on the battery
board and DVD LOADER.

Remove four screws on the key board.

screws 4pcs.connecter 8pcs.

Remove the speaker grill and 4pcs
screws. .

Remove the 2pcs screws and cabinet
on the TFT and IR board.

5.0 TROUBLESHOOTING

SYMPTOM: NO IMAGE / NO SOUND

SYMPTOM: NO IMAGE OUTPUT ( THE PANEL SHOW BLUE PICTURE)

Start

NOTE: AV Cable TYPE from outside to
Inside L-Audio, R-Audio, Video, Ground

SYMPTOM: NO SOUND COMES FROM SPEAKER

yes

Check the external AV

Cable TYPE

connection is OK?

Replace Main Board

yes

note

and

Start

no

no

Replace DVD DriveCheck DVD Drive work?

Exchange AV cable

Check the Connection OK? Reinsertion

yes

Check speaker OK?

yes

Replace Main Board

no

no

Change the speaker

5.0 TROUBLESHOOTING

SYMPTOM: THE DVD DRIVE DOES NOT WORK

SYMPTOM: THE DVD DRIVE DOESN＇T WORK

Start

Check DVD-Loader

connection OK?

Yes

Check the DVD-Loader

OK?

Yes

Replace main board

NO

Cable ReinsertionNO

Replace DVD-

Loader

5.0 TROUBLESHOOTING

SYMPTOM: ADAPTOR CANNOT POWER ON

Adaptor can not Power ON

Start

Check Adaptor OK?

Yes

Check the Power-ON

button and cable OK?

NO

Replace Button or

Cable

NO

Change adaptor SET OK?

YES

Replace Main Board

OK

Yes

No

Return set to

Customer