PHILIPS L9.1E-AB Service Manual

Colour Television

Chassis

L9.1E

AB

CL 06532025_036.eps

160500

Contents			Page	Contents		Page
1.	Technical specifications, connections and			8.	Alignments	43
	chassis overview		2	9.	Circuit description new circuits	47
2.	Safety instructions, warnings and notes		4		List of abbreviations	53
3.	Direction for use		6	10. Spare parts list		55
4.	Mechanical instructions		9
5.	Faultfinding and repair tips		10
6.	Block diagram
	Supply voltage diagram		19
	Block diagram		20
	Oscillogram overview		21
	Testpoint overviews		21
7.	Schematics and PWBs		Diagram PWB
	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

©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

312278510720

GB 2

1.

L9.1E AB

Technical Specifications, connections and chassis overview

1. Technical Specifications, connections and chassis overview

1.1Technical Specifications

Mains voltage			:	90V - 276Vac; 50-
				60Hz
Maximum power consumption
•	25” : 75W +/- 10%
•	28” : 90W	+/- 10%
•	29” : 90W	+/- 10%
Standby power consumption			:	6W +/- 10%

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/
		SECAM)

1.2Connection facilities

	FRONT + TOP CONTROL	SIDE I/O
	- VOLUME +	S-Video
EXT1		Video
		L
EXT2	- PROGRAM +	Audio
		R
	IR
	RED
		CL 06532025_037.eps
		010200

			Figure 1-1
1.2.1 Scart 1: CVBS(in/out) + RGB(in) - tuner at output					11	- -
					12	- -
1	- Audio Out R (0.5Vrms <= 1kΩ)				13Earth screen
2	- Audio In R	(0.2-2Vrms >= 10kΩ)			14	- Earth screen	(300mVpp/75Ω)
3	- Audio Out L (0.5Vrms <= 1kΩ)				15- C
4	- Earth screen				16	- -
5	- Earth screen				17	- Earth screen
6	- Audio In L	(0.2-2Vrms >= 10kΩ)			18	- Earth screen
7	- Blue	(0.7Vpp/75Ω)			19CVBS		(1Vpp/75Ω)
8	- CVBS status	(INT = 0-2V, EXT(16:9) = 4.5-7V,			20CVBS/Y
		EXT(4:3) = 9.5-12V)			21	- Earth screen
9	- Earth screen
10	- -			1.2.3	Cinch - audio/video in
11	- Green	(0.7Vpp/75Ω)
12- -					1	- CVBS
13	- Earth screen					(yellow)	(1Vpp 75Ω)
14	- Earth screen	(0.7Vpp/75Ω)			2	- Audio L (red)	(0.2-2Vrms 10kΩ)
15Red					3	- Audio R
16FBL		(>0.9V RGB mode )				(white)	(0.2-2Vrms 10kΩ)
17	- Earth screen
18	- Earth screen			1.2.4	Headphone
19CVBS
20CVBS		(1Vpp/75Ω)			1	- 8-600Ω	(4mW)
21	- Earth screen

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

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	- -

Technical Specifications, connections and chassis overview

L9.1E AB

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GB 3

1.3Chassis overview

F TOP CONTROL RF

E1 SIDE AV PANEL + HEADPHONE

MAIN

CHASSIS

PANEL

TOP CONTROL FSQ		T1
SMART ATS		S
CRT PANEL		B
POWER SUPPLY		A1
HOR.DEFLECTION		A2
VERT. DEFLECTION		A3
SYNCHRONISATION		A4
TUNER + VIDEO IF		A5
VIDEO PROCESSING		A6
CONTROL ( C)		A7
FRONT CONTROL		A8
NICAM + 2CS DECODER		A10
SMART SOUND		A11
AUDIO AMPLIFIER		A12
HEADPHONE		A13
I/O SCART		A15
MAINS HARMONIC PANEL		U

CL 06532025_026.eps

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Figure 1-2

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2.

L9.1E AB

Safety instructions, Warnings and Notes

2. Safety instructions, Warnings and Notes

2.1Safety 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 , 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 MΩ

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.

2.2Maintenance 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.

2.3Warnings

•ESD

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.

•Available ESD protection equipment:

–Complete kit ESD3 (small table mat, Wristband, Connection box, Extension cable and Earth cable) 4822 310 10671

–Wristband tester 4822 344 13999

•In order to prevent damage to ICs and transistors, all 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 DC- V). Discharge until the meter reading is 0 V (after approx. 30 s).

V

CL 26532098/042 140792

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

2.4Notes

•The direct voltages and oscillograms should be measured with regard to the tuner earth ( ), or hot earth ( ) 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 ( ) and without aerial signal ( ).

Voltages in the power supply section are measured both for normal operation ( ) and in standby ( ). 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.

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3.

L9.1E AB

Directions for use

3. Directions for use

Directions for use

L9.1E AB

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GB 8

3.

L9.1E AB

Directions for use

Mechanical instructions

L9.1E AB

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GB 9

4. Mechanical instructions

4.1Service 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.

A

1

1

2

B

3

CL 86532104_007.ai

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Figure 4-1

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5.

L9.1E AB

Fault finding and repair tips

5. Fault finding and repair tips

In this chapter the following paragraphs are included:

5.1Test points

5.2Service Modes and Dealer Service Tool (DST)

5.3Menus and submenus

5.4Error code buffer and error codes

5.5The “blinking LED” procedure

5.6Trouble shooting tips

5.7Customer service mode

5.8Computer Aided Repair ( Compair )

5.9Ordering ComPair

5.1Test 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

–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.

5.2Service 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.

5.2.1Installation 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).

5.2.2Diagnose features for the servicer

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).

5.2.3Service 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:

5.2.4Special 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:

LLLL L90BBC X.Y	SDM				SDM
OP VALUE
OB1 OB2 OB3 OB4 OB5 OB6 OB7				TV LOCK
	MENU			INSTALLATION
				BRIGHTNESS	llllll......31
				COLOUR	llllll......31
ERR xx xx xx xx	xx			CONTRAST	llllll......31

SDM

CL 86532104_015.eps

160299

Figure 5-1

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 VOLkey 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- , VOLand 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

5.2.5Service 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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GB 11