Philips PET-940 Service Manual

DVD Portable Player PET940

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

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
Overall Wiring Diagram…………………………………………7
Electrical Diagram……………………………………………… 8
Component Layout……………………………………………. 9
Service Part List………………………………………………… 10
Revision List……………………………………………………. 11

3141 785 32700

Version 1.0

1.0 TECHNICAL SPECIFICATION

General

Dimensions (W x H x D): 260 x 198 x 40 mm
Weight: 1.98kg
Power supply: DC 9-12V 1.8A
Power consumption: 20W
Operating temp. & RH: 0 - 50 degC / 30 – 90% RH
Laser wavelength: 650nm
Video system NTSC / PAL / AUTO

Dynamic range: >/=80dB
Signal/Noise ratio: >/=85dB
Frequency response 20Hz-20kHz +/-1dB
Channel Separation 1kHz >/=85dB
Channel Balance 1kHz 1dB

Audio out (analog audio) Output level: 2V +/- 10%
Load impedance: 10Kohm
Video out Output level 1Vp – p +/- 20%
Load impedance 75ohm

Current consumption

DC-IN SUPPLY (9V)

Battery Charging Current 1.2A typical

BATT. SUPPLY (7.2V)
Power Off 0A
Playback with TFT on <1.2A typical
Playback without TFT on <600mA
Battery time (playback) >2.5 hour

Headphone out (headphone output load 2x16 ohm)

Maximum output power:
Frequency response:
SNR (A-wght):
THD (0.2-20kHz):
Left-Right Channel
Separation:
Left-Right Channel
Balance:

Supported disc type

Video Playback
Formats:

Audio Playback
Formats:

>10mW
20Hz – 20kHz
80dB typical
<1%
32dB

1dB

Playback disc type: DVD, Picture-CD,

SVCD, Video CD, MP3­CD, CD-R/CD-RW,
WMA-CD, DVD-R, DVD­RW, DVD+R, DVD+RW

Video Playback Format: DVD / VCD / JPEG /

DivX

Audio Playback Format: CD/MP3, MP3-DVD,

WMA, DivX

Disc Diameter 12cm

Pixel specification

Zero bright-dot & max. 3 dark-dots

1.0 TECHNICAL SPECIFICATION

Factory Service Mode (FSM)

Procedure to check the software version of
your portable DVD Player

1. Press [SETUP] to enter the setup Meun

2. Press [RETURN] and then press “1” -> ”2” -> ”3”

by remote control

3. The display will show the software version as the

date of which the software was built on the bottom
of the screen.

Procedure to upgrade the software of your
portable DVD Portable

For the best performance of your DVD Portable.
Check www.philips.com/support for latest
software upgrades available.

1. Download the latest software from the Philips

support site

2. Unzip the files and then burn it into a CD-ROM to

make a disc for upgrade

3. Power on the Portable DVD Player with AC/DC

adaptor

4. Play CD-ROM for firmware upgrade

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

5. Once upgrade is completed, the player is reset

automatically

6. Open the DVD door to remove the disc

Procedure to change region code of your
portable DVD player

1. Power on player and open the DVD door

2. Press [SETUP] by remote control.

3. In Set Up Menu, select <Audio> and press [OK]

4. Press [2], [1], [2], [2], [2], [5], [<], [v]

5. Display will show the Region Code

6. Press Number Key button by remote control to
select the region code

Refer below table for your region code setting

7.

Region code “0” can be used for all regions!

8. Press

9. Power off and power on again to verify if region

Remarks:

[SETUP] to save and exit your setting

code change is done

1. Password is CONFIDENTIAL

2. Region code is printed on product type

plate. Due to DVD legislation region codes
different to assigned region may not be
released

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.

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.

D

WARNUNG

ESD

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 INSTRUCTIONS FOR USE

1

POWER

Switch the power on/off.

2

Press once to stop playback
and store the stop position.
Press twice to stop playback
completely.

3

Start / pause / resume play­back.

/

4

Skip to previous/next track or
fast search backward/forward.

- VOL +

5

Volume control.

6

OPTION

Access additional functions

7

MENU

Display MENU page.

.

8

Up / down / left / right cursor.

OK

Confirm selection

9

POWER/IR/CHR

Power /remote sensor /charging
indicator.

10

OPEN

Open the disc door to insert
or remove disc.

11

1 2

Headphones jacks.

AVOUT

12

Audio/Video output.

DC IN 9-12V

13

Power supply socket.

14

USB port

Insert USB plug.

15

RESET

IReset the player when it is
hanged up.

,,,

MAIN UNIT CONTROL

.

14

15

1
2

3
4
5

6
7

8

9

10

11
12

13

CAUTION

Use of controls or adjustments or performance of
procedures other than herein may result in hazardous
radiation exposure or other unsafe operation.

REMOTE CONTROL

MENU

1

Display MENU page.

,,,

2

Up / down / left / right
navigation key.

OK

Confirm seletion.

VOL +/-

Volume control.

DISPLAY

3

Adjust the display value of
the system.

4

Skip to previous chapter,
track or title.

5

Start / pause / resume
playback

6

Access additional functions.

7

0 - 9

Numeric keypad.

SUBTITLE

8

Subtitle language selector.

9

RETURN

For VCD menu page.

10

A - B

To repeat or loop a sequence
in a title.

11

SETUP

Enter SETUP menu.

12

OPTION

Access additional functions.

13

Skip to next chapter, track
or title.

14

Mute player volume

AUDIO

15

Audio language selector.

16

ZOOM

Enlarge video image.

10

1

2

3

4

5

6

7

8
9

11

12

13

14

15
16

4.0 MECHNICAL INSTRUCTIONS

1. Open the machine as Fig.1 5. Remove screws to remove display frame
Remove speaker grill .

Fig.1 Fig.5

2. Remove screws to remove the top cover
discreteness as Fig.2.

shade(base) and backlight board as Fig.5.

6. Then remove TFT LCD and speakers.

Fig.2

3.Remove screws to remove display frame shade
(top) as Fig.3.

Fig.3

4. Broken connections to remove IF board as

Fig.4.

Fig.6

7. Base view as Fig.7.
Remove screws to remove the base cover
discreteness.

Fig.4

Fig.7

4.0 MECHNICAL INSTRUCTIONS

8. Remove battery ass’y as Fig.8. 12. Remove screws to remove hinge adorn

Fig.8

9. Broken connections to remove loading ass’y

as Fig.9.

Fig.9

panel as Fig.12.

Fig.12

13. Remove screws to remove hinge right and
hinge left ,then separate diplay frame disc­ reteness and middle cabinet discreteness.

10. Remove main board as Fig.10.

Fig.10

11. Remove screws to remove function board
as Fig.11.

Fig.11

Fig.13