PHILIPS L9.1E-AB Service Manual

Colour Television Chassis

CL 06532025_036.eps

160500

L9.1E

Contents Page Contents Page

1. Technical specifications, connections and chassis overview 2

2. Safety instructions, warnings and notes 4

3. Direction for use 6

4. Mechanical instructions 9

5. Faultfinding and repair tips 10

Block diagram

6. Supply voltage diagram 19 Block diagram 20 Oscillogram overview 21 Testpoint overviews 21

Schematics and PWBs Diagram PWB

7. Power supply (Diagram A1) 22 35-37 Diversity table A1-A3 23 Horizontal deflection (Diagram A2) 24 35-37 Vertical deflection (Diagram A3) 25 35-37 Synchronisation (Diagram A4) 26 35-37 Tuner + video IF (Diagram A5) 27 35-37 Video processing (Diagram A6) 28 35-37 Control (Diagram A7) 29 35-37 Front control (Diagram A8) 30 35-37 Nicam + 2CS decoder (Diagram A10) 31 35-37 Smart sound (Diagram A11) 33 35-37 Audio amplifier (Diagram A12) 32 35-37 Headphone (Diagram A13) 33 35-37 I/O Scart (Diagram A15) 34 35-37 CRT panel (Diagram B) 38 39 Side AV panel (Diagram E1) 40 40 Smart ATS (Diagram S) 41 41 Top control panel (RF) (Diagram T) 42 42 Top control panel (FSQ) (Diagram T1) 42 42 Mains harmonic panel (Diagram U) 41 41

8. Alignments 43

9. Circuit description new circuits 47 List of abbreviations 53

10. Spare parts list 55

Copyright 2000 Philips Consumer Electronics B.V. Eindhoven, The Netherlands. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise without the prior permission of Philips.

Published by JvR 0065 Printed in the Netherlands Subject to modification 5 312278510720

GB 2 L9.1E AB1.

Technical Specifications, connections and chassis overview

1. Technical Specifications, connections and chassis overview

1.1 Technical Specifications

Mains voltage : 90V - 276Vac; 50-

Maximum power consumption

• 25” : 75W +/- 10%

• 28” : 90W +/- 10%

• 29” : 90W +/- 10% Standby power consumption : 6W +/- 10%

1.2 Connection facilities

60Hz

EXT1

EXT2

Colour Synchronisation : Sub-carrier pull in range : +/- 300Hz Horizontal Synchronisation : Catching range : +/- 600 Hz Holding range : +/- 1200 Hz Vertical Locking Range : 49 Hz - 61Hz Tuner : UV 1316/AI-2 (PAL/

FRONT + TOP CONTROL

- VOLUME +

- PROGRAM +

RED

SECAM)

SIDE I/O

S-Video

Video

L Audio R

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010200

1.2.1 Scart 1: CVBS(in/out) + RGB(in) - tuner at output

1 - Audio Out R (0.5Vrms <= 1kΩ) 2 - Audio In R (0.2-2Vrms >= 10kΩ) 3 - Audio Out L (0.5Vrms <= 1kΩ) 4 - Earth screen 5 - Earth screen 6 - Audio In L (0.2-2Vrms >= 10kΩ) 7 - Blue (0.7Vpp/75Ω) 8 - CVBS status (INT = 0-2V, EXT(16:9) = 4.5-7V,

EXT(4:3) = 9.5-12V) 9 - Earth screen 10- - 11- Green (0.7Vpp/75Ω) 12- - 13- Earth screen 14- Earth screen 15- Red (0.7Vpp/75Ω) 16- FBL (>0.9V RGB mode ) 17- Earth screen 18- Earth screen 19- CVBS 20- CVBS (1Vpp/75Ω) 21- Earth screen

1.2.2 Scart 2: CVBS (in/out) + SVHS(in)

Figure 1-1

H k k

H k

11- - 12- - 13- Earth screen 14- Earth screen 15- C (300mVpp/75Ω) 16- - 17- Earth screen 18- Earth screen 19- CVBS 20- CVBS/Y (1Vpp/75Ω) 21- Earth screen

1.2.3 Cinch - audio/video in

1 - CVBS

(yellow) (1Vpp 75Ω) 2 - Audio L (red) (0.2-2Vrms 10kΩ) 3 - Audio R

(white) (0.2-2Vrms 10kΩ)

1.2.4 Headphone

1 - 8-600Ω (4mW)

H H

q q

Input = EXT2 => output = tuner Input = tuner/EXT1 => output = tuner/EXT1 1 - Audio Out R (0.5Vrms <= 1kΩ) 2 - Audio In R (0.2-2Vrms >= 10kΩ) 3 - Audio Out L (0.5Vrms <= 1kΩ) 4 - Earth screen 5 - Earth screen 6 - Audio In L (0.2-2Vrms >= 10kΩ) 7-- 8 - CVBS status (INT = 0-2V, EXT(16:9) = 4.5-7V,

EXT(4:3) = 9.5-12V) 9 - Earth screen 10- -

H H

Technical Specifications, connections and chassis overview

1.3 Chassis overview

GB 3L9.1E AB 1.

TOP CONTROL RF

SIDE AV PANEL + HEADPHONE

MAIN

CHASSIS

PANEL

TOP CONTROL FSQ

SMART ATS

CRT PANEL

POWER SUPPLY

HOR.DEFLECTION

VERT. DEFLECTION

SYNCHRONISATION

TUNER + VIDEO IF

VIDEO PROCESSING

CONTROL (µC)

FRONT CONTROL

NICAM + 2CS DECODER

SMART SOUND

AUDIO AMPLIFIER

HEADPHONE

I/O SCART

MAINS HARMONIC PANEL

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A10

A11

A12

A13

A15

070600

Figure 1-2

GB 4 L9.1E AB2.

Safety instructions, Warnings and Notes

2. Safety instructions, Warnings and Notes

2.1 Safety instructions for repairs

• Safety regulations require that during a repair:

– The set should be connected to the mains via an

isolating transformer;

– Safety components, indicated by the symbol h,

should be replaced by components identical to the original ones;

– When replacing the CRT, safety goggles must be

worn.

• Safety regulations require that after a repair the set must

be returned in its original condition. In particular attention should be paid to the following points. – General repair instruction: As a strict precaution, we

advise you to resolder the solder joints through which the horizontal deflection current is flowing, in particular a. All pins of the line output transformer (LOT); b. Fly-back capacitor(s); c. S-correction capacitor(s); d. Line output transistor; e. Pins of the connector with wires to the deflection

coil;

f. Other components through which the deflection

current flows. Note: This resoldering is advised to prevent bad connections due to metal fatigue in solder joints and is therefore only necessary for television sets older than 2 years.

– The wire trees and EHT cable should be routed

correctly and fixed with the mounted cable clamps.

– The insulation of the mains lead should be checked

for external damage.

– The mains lead strain relief should be checked for its

function in order to avoid touching the CRT, hot components or heat sinks.

– The electrical DC resistance between the mains plug

and the secondary side should be checked (only for sets which have a mains isolated power supply). This check can be done as follows:

1. Unplug the mains cord and connect a wire between the two pins of the mains plug;

2. Set the mains switch to the "on" position (keep the mains cord unplugged!);

3. Measure the resistance value between the pins of the mains plug and the metal shielding of the tuner or the aerial connection on the set. The reading should be between 4.5 MΩ and 12 M

4. Switch off the TV and remove the wire between the two pins of the mains plug.

– The cabinet should be checked for defects to avoid

touching of any inner parts by the customer.

2.2 Maintenance instruction

It is recommended to have a maintenance inspection carried out by a qualified service employee. The interval depends on the usage conditions:

• When the set is used under normal circumstances, for example in a living room, the recommended interval is 3 to 5 years.

• When the set is used in circumstances with higher dust, grease or moisture levels, for example in a kitchen, the recommended interval is 1 year.

• The maintenance inspection contains the following actions: – Execute the above mentioned 'general repair

instruction'.

– Clean the power supply and deflection circuitry on

the chassis.

– Clean the picture tube panel and the neck of the

picture tube.

2.3 Warnings

• ESD

• Available ESD protection equipment:

• In order to prevent damage to ICs and transistors, all

Ω

All ICs and many other semiconductors 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 by a wristband with resistance. Keep components and tools also at this same potential.

– Complete kit ESD3 (small table mat, Wristband,

Connection box, Extension cable and Earth cable) 4822 310 10671

– Wristband tester 4822 344 13999

high-voltage flashovers must be avoided. In order to prevent damage to the picture tube, the method shown in Fig. 2-1 should be used to discharge the picture tube. Use a high-voltage probe and a multimeter (position DCV). Discharge until the meter reading is 0 V (after approx. 30 s).

CL 26532098/042

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Figure 2-1

• Together with the deflection unit and any multipole unit, the flat square picture tubes used, form an integrated unit. The deflection and the multipole units are set optimally at the factory. Adjustment of this unit during repair is therefore not recommended.

• Be careful during measurements in the high-voltage section and on the picture tube.

• Never replace modules or other components while the unit is switched on.

• When making settings, use plastic rather than metal tools. This will prevent any short circuits and the danger of a circuit becoming unstable.

Safety instructions, Warnings and Notes

2.4 Notes

• The direct voltages and oscillograms should be measured with regard to the tuner earth (H), or hot earth (I) as this is called.

• The direct voltages and oscillograms shown in the diagrams are indicative and should be measured in the Service Default Mode (see chapter 5) with a colour bar signal and stereo sound (L: 3 kHz, R: 1 kHz unless stated otherwise) and picture carrier at 475.25 MHz.

• Where necessary, the oscillograms and direct voltages are measured with (D) and without aerial signal (E). Voltages in the power supply section are measured both for normal operation (G) and in standby (F). These values are indicated by means of the appropriate symbols.

• The picture tube PWB has printed spark gaps. Each spark gap is connected between an electrode of the picture tube and the Aquadag coating.

• The semiconductors indicated in the circuit diagram and in the parts lists are completely interchangeable per position with the semiconductors in the unit, irrespective of the type indication on these semiconductors.

GB 5L9.1E AB 2.

GB 6 L9.1E AB3.

3. Directions for use

Directions for use

GB 7L9.1E AB 3.

GB 8 L9.1E AB3.

Directions for use

4. Mechanical instructions

4.1 Service positions

For the service position of the main carrier see figure 4.1A.

1. Disconnect the wire on the right-hand speaker and the degaussing cable.

2. The mono-carrier can be removed by pushing the two centre clips at both chassis brackets outwards and pulling the panel forward.

3. Flip the mono-carrier with the component side towards the CRT.

4. Slide the metal heatsink underneath the left chassis bracket till the carrier is fixed. See figure 4.1B.

Mechanical instructions

GB 9L9.1E AB 4.

Figure 4-1

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GB 10 L9.1E AB5.

Fault finding and repair tips

5. Fault finding and repair tips

In this chapter the following paragraphs are included:

5.1 Test points

5.2 Service Modes and Dealer Service Tool (DST)

5.3 Menus and submenus

5.4 Error code buffer and error codes

5.5 The “blinking LED” procedure

5.6 Trouble shooting tips

5.7 Customer service mode

5.8 Computer Aided Repair ( Compair )

5.9 Ordering ComPair

5.1 Test points

The L9 chassis is equipped with test points in the service printing. These test points are referring to the functional blocks:

• A1-A2-A3, etc.: Test points for the Nicam + 2CS decoder / Audio amplifier

• C1-C2-C3, etc.: Test points for the control circuit / front control

• F1-F2-F3, etc.: Test points for the vertical deflection circuit

• I1-I2-I3, etc.: Test points for the intermediate frequency circuit

• L1-L2-L3, etc.: Test points for the horizontal deflection circuit

• P1-P2-P3, etc.: Test points for the power supply

• S1-S2-S3, etc.: Test points for the synchronisation circuit

• V1-V2-V3, etc.: Test points for the video processing

circuit / CRT panel

Measurements are performed under the following conditions: Video: colour bar signal; audio: 3KHz left, 1KHz right

5.2 Service modes and Dealer Service Tool (DST)

For easy installation and diagnosis the dealer service tool (DST) RC7150 can be used. When there is no picture (to access the error code buffer via the OSD), DST can enable the functionality of displaying the contents of the entire error code buffer via the blinking LED procedure.

5.2.1 Installation features for the dealer

The dealer can use the RC7150 for programming the TV-set with presets. 10 Different program tables can be programmed into the DST via a GFL TV-set (downloading from the GFL to the DST; see GFL service manuals) or by the DST-I. For explanation of the installation features of the DST, the directions for use of the DST are recommended (For the L9 chassis, download code 4 should be used).

5.2.2 Diagnose features for the servicer

– By transmitting the "DEFAULT" command with the

RC7150 Dealer Service Tool (this works both while the set is in normal operation mode or in the SAM)

– Standard RC sequence 062596 followed by the key

“MENU”

– By shorting test-point M20 to ground on the mono-carrier

while switching on the set. After switching on the set the short-circuit can be removed. ( Caution!! Override of 5V

protections ). Exit the SDM: Switch the set to Standby or press EXIT on the DST (the error buffer is also cleared). Note: When the mains power is switched off while the set is in SDM, the set will switch to SDM immediately when the mains is switched on again. ( The error buffer will be cleared ). The SDM sets the following pre-defined conditions:

• Pal/Secam sets: tuning at 475.25 PAL (For France select

the L’-signal ) Volume level is set to 25% (of the maximum volume level). Other picture and sound settings are set to 50%. The following functions are “ignored” in SDM since they interfere with diagnosing/repairing a set. “Ignoring” means that the event that is triggered is not executed, the setting remains unchanged.

• (Sleep)Timer

• Blue mute

• Auto switch off

• Hotel or Hospitality Mode

• Child lock or Parental lock

• Skipping, blanking of “Not favourite” present/channels

• Automatic storing of Personal Preset settings

• Automatic user menu time-out

All other controls operate normally.

5.2.4 Special functions in SDM

Access to normal user menu

Pressing the “MENU” button on the remote control will enter the normal user menu ( TV lock, Installation, Brightness, colour and contrast ) while “SMD” remains displayed in top of screen). Pressing the “MENU” key again will return to the last SDM status.

Error buffer

Pressing the “OSD” button of the remote control shows all OSD (incl. error buffer).

Access to SAM

By pressing the “CHANNEL DOWN” and “VOLUME DOWN“ buttons on the local keyboard simultaneously the set switches from SDM to SAM or pressing “ALIGN” on the DST In the SDM the following information is displayed on the screen:

L9 sets can be put in two service modes via the RC7150. These are the Service Default Mode (SDM) and the Service Alignment Mode (SAM).

5.2.3 Service Default Mode (SDM)

The purpose of the SDM is: – provide a situation with predefined settings to get the

same measurements as in this manual

– override 5V protections in case of short circuiting pin 20

to ground.

– start the blinking LED procedure – Setting of options controls – Inspect the error buffer

Entering the SDM:

LLLL L90BBC X.Y SDM OP VALUE OB1 OB2 OB3 OB4 OB5 OB6 OB7

ERR xx xx xx xx xx

SDM

Figure 5-1

TV LOCK INSTALLATION BRIGHTNESS COLOUR CONTRAST

SDM

......

llllll

......

llllll

......

llllll

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Fault finding and repair tips

Explanation notes/references: “LLLL” Operation hours timer (hexadecimal) (2) Software identification of the main micro controller (L90BBC X.Y)

• L90 is the chassis name for L9.0E

• BBC is 2 letter and 1 digit combination to indicate the

software type and the supported languages:

• X = (main version number)

• Y = (subversion number) BB = (range specification )

(3) “SDM” To indicate that the TV set is in de service mode (4) “OP” Options Code which exists of 2 characters. It is possible to change each option code “VALUE” The value of the selected option ( ON/OFF or a combination of 2 letters )

“XXX” Value of the options bytes ( OB1 .. OB7) “ERR” The last five detected errors; The left most number

indicates the most recent error detected. The MENU UP or MENU DOWN command can be used to select the next/previous option; The MENU LEFT and MENU RIGHT command can be used to change the option value. Remark: When the option-code RC = OFF, the P+ and the P- key have the same functions as the MENU UP/DOWN keys while the VOL+ and the VOL- key have the same function as the MENU LEFT/RIGHT keys. It is not possible to change the channel preset or to adjust the volume when in SAM/SDM menu when the option RC = OFF. Using a L9 remote control, option-code RC = ON, the P+, P, VOL- and VOL+ can be used to change the preset and/or to adapt the volume, while the menu-cursor keys are used to select the option and to change its value. For an extended overview of the option codes see Chapter 8

- Options

GB 11L9.1E AB 5.

5.2.5 Service Alignment Mode (SAM)

The purpose of the SAM is to do tuning adjustments, align the white tone, adjust the picture geometry and do sound adjustments. For recognition of the SAM, “SAM” is displayed at the top of the right side of the screen Entering SAM: – By transmitting the "ALIGN" command with the RC7150

Dealer Service Tool

– By pressing the “CHANNEL DOWN” and “VOLUME

DOWN” key on the local keyboard simultaneously when the set is in SDM

– Standard RC sequence 062596 followed by the key

“OSD”

Exit the SAM

Switch the set to standby or press EXIT on the DST (the error buffer is not cleared). Note: When the mains power is switched off while the set is in SAM, the set will switch to SAM immediately when the mains is switched on again. ( The error buffer will not be cleared ). In the SAM the following information is displayed on the screen:

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