Philips L01.1U AC, 32PW6331, L01 1UAC 7638 Service Manual

IMPORTANT SAFETY NOTICE

Proper service and repair is important to the safe, reliable operation of all Philips Consumer Electronics Company** Equipment. The service procedures recommended by Philips and described in this service manual are effective methods of performing service operations. Some of these service operations require the use of tools specially designed for the purpose. The special tools should be used when and as recommended.

It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read in order to minimize the risk of personal injury to service personnel. The possibility exists that improper service methods may damage the equipment. It also is important to understand that these CAUTIONS and NOTICES ARE NOT EXHAUSTIVE. Philips could not possibly know, evaluate and advise the service trade of all conceivable ways in which service might be done, or of the possible hazardous consequences of each way. Consequently, Philips has not undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not recommended by Philips must first satisfy himself thoroughly that neither his safety nor the safe operation of the equipment will be jeopardized by the service method selected.

** Hereafter throughout this manual, Philips Consumer Electronics Company will be referred to as Philips.

WARNING

Critical components having special safety characteristics are identified with a or "S" by the Ref. No. in the parts list and enclosed within a broken line* (where several critical components are grouped in one area) along with the safety symbol

on the schematics or exploded views. Use of substitute replacement parts which do not have the same specified safety characteristics may create shock, fire, or other hazards. Under no circumstances should the original design be modified or altered without written permission from Philips. Philips assumes no liability, express or implied, arising out of any unauthorized modification of design. Servicer assumes all liability.

* Broken Line ____ _ ____ _ ____ _ ____

FIRE AND SHOCK HAZARD

1. Be sure all components are positioned in such a way as to avoid the possibility of adjacent component

shorts. This is especially important on those chassis which are transported to and from the service shop.

2. Never release a repaired unit unless all protective devices such as insulators, barriers, covers, strain

reliefs, and other hardware have been installed in accordance with the original design.

3. Soldering and wiring must be inspected to locate possible cold solder joints, solder splashes, sharp solder

points, frayed leads, pinched leads, or damaged insulation (including the ac cord). Be certain to remove loose solder balls and all other loose foreign particles.

4. Check across-the-line components and other components for physical evidence of damage or

deterioration and replace if necessary. Follow original layout, lead length, and dress.

5. No lead or component should touch a receiving tube or a resistor rated at 1 watt or more. Lead tension

around protruding metal surfaces or edges must be avoided.

6. Critical components having special safety characteristics are identified with an 'S' by the Ref. No. in the

parts list and enclosed within a broken line* (where several critical components are grouped in one area) along with the safety symbol on the schematic diagrams and /or exploded views.

7. When servicing any unit, always use a separate isolation transformer for the chassis. Failure to use a

separate isolation transformer may expose you to possible shock hazard, and may cause damage to servicing instruments.

8. Many electronic products use a polarized ac line cord (one wide pin on the plug). Defeating this safety

feature may create a potential hazard to the servicer and the user. Extension cords which do not incorporate the polarizing feature should never be used.

9. After reassembly of the unit, always perform an ac leakage test or resistance test from the line cord to all

exposed metal parts of the cabinet. Also, check all metal control shafts (with knobs removed), antenna terminals, handles, screws, etc., to be sure the unit may be safely operated without danger of electrical shock.

* Broken line ____ _ ____ _ ____ _ ____

LEAKAGE CURRENT COLD CHECK

1. Unplug the ac line cord and connect a jumper between the two prongs of the plug.

2. Turn on the power switch.

3. Measure the resistance value between the jumpered ac plug and all exposed cabinet parts of the receiver,

such as screw heads, antennas, and control shafts. When the exposed metallic part has a return path to the chassis, the reading should be between 1 megohm and 5.2 megohms. When the exposed metal does not have a return path to the chassis, the reading must be infinity. Remove the jumper from the ac line cord.

LEAKAGE CURRENT HOT CHECK

1. Do not use an isolation transformer for this test. Plug the completely reassembled receiver directly into

the ac outlet.

2. Connect a 1.5k, 10W resistor paralleled by a 0.15uF. capacitor between each exposed metallic cabinet

part and a good earth ground such as a water pipe, as shown below.

3. Use an ac voltmeter with at least 5000 ohms/volt sensitivity to measure the potential across the resistor.

4. The potential at any point should not exceed 0.75 volts. A leakage current tester may be used to make

this test; leakage current must not exceed 0.5mA. If a measurement is outside of the specified limits, there is a possibility of shock hazard. The receiver should be repaired and rechecked before returning it to the customer.

5. Repeat the above procedure with the ac plug reversed. (Note: An ac adapter is necessary when a

polarized plug is used. Do not defeat the polarizing feature of the plug.)

With the instrument completely reassembled, plug the ac line cord directly into a 120Vac outlet. (Do not use an isolation transformer during this test.) Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI) C101.1 Leakage Current for Appliances and Underwriters Laboratories (UL) 1410, (50.7). With the instrument ac switch first in the on position and then in the off position, measure from a known earth ground (metal water pipe, conduit, etc.) to all exposed metal parts of the instrument (antennas, handle brackets, metal cabinet, screw heads, metallic overlays, control shafts, etc.), especially any exposed metal parts that offer an electrical return path to the chassis. Any current measured must not exceed 0.5mA. Reverse the instrument power cord plug in the outlet and repeat the test. See the graphic below.

TV SAFETY NOTES

SAFETY CHECKS

After the original service problem has been corrected, a complete safety check should be made. Be sure to check over the entire set, not just the areas where you have worked. Some previous servicer may have left an unsafe condition, which could be unknowingly passed on to your customer. Be sure to check all of the following:

Fire and Shock Hazard Implosion X-Radiation Leakage Current Cold Check Leakage Current Hot Check Picture Tube Replacement Parts Replacement

WARNING: Before removing the CRT anode cap, turn the unit OFF and short the HIGH VOLTAGE to the CRT DAG ground.

SERVICE NOTE: The CRT DAG is not at chassis ground.

IMPLOSION

1. All picture tubes used in current model receivers are equipped with an integral implosion system. Care should always be used, and safety glasses worn, whenever handling any picture tube. Avoid scratching or otherwise damaging the picture tube during installation.

2. Use only replacement tubes specified by the manufacturer.

X-RADIATION

1. Be sure procedures and instructions to all your service personnel cover the subject of X-radiation. Potential sources of X-rays in TV receivers are the picture tube and the high voltage circuits. The basic precaution which must be exercised is to keep the high voltage at the factory recommended level.

2. To avoid possible exposure to X-radiation and electrical shock, only the manufacturer's specified anode connectors must be used.

3. It is essential that the service technician has an accurate HV meter available at all times. The calibration of this meter should be checked periodically against a reference standard.

4. When the HV circuitry is operating properly there is no possibility of an X-radiation problem. High voltage should always be kept at the manufacturer's rated value - no higher - for optimum performance. Every time a color set is serviced, the brightness should be run up and down while monitoring the HV with a meter to be certain that the HV is regulated correctly and does not exceed the specified value. We suggest that you and your technicians review test procedures so that HV and HV regulation are always checked as a standard servicing procedure, and the reason for this prudent routine is clearly understood by everyone. It is important to use an accurate and reliable HV meter. It is recommended that the HV reading be recorded on each customer's invoice, which will demonstrate a proper concern for the customer's safety.

5. When troubleshooting and making test measurements in a receiver with a problem of excessive high voltage, reduce the line voltage by means of a Variac to bring the HV into acceptable limits while troubleshooting. Do not operate the chassis longer than necessary to locate the cause of the excessive HV.

6. New picture tubes are specifically designed to withstand higher operating voltages without creating undesirable X-radiation. It is strongly recommended that any shop test fixture which is to be used with the new higher voltage chassis be equipped with one of the new type tubes designed for this service. Addition of a permanently connected HV meter to the shop test fixture is advisable. The CRT types used in these new sets should never be replaced with any other types, as this may result in excessive X-radiation.

7. It is essential to use the specified picture tube to avoid a possible X-radiation problem.

8. Most TV receivers contain some type of emergency "Hold Down" circuit to prevent HV from rising to excessive levels in the presence of a failure mode. These various circuits should be understood by all technicians servicing them, especially since many hold down circuits are inoperative as long as the receiver performs normally.

PICTURE TUBE REPLACEMENT

The primary source of X-radiation in this television receiver is the picture tube. The picture tube utilized in this chassis is specially constructed to limit X-radiation emissions. For continued Xradiation protection, the replacement tube must be the same type as the original, including suffix letter, or a Philips approved type.

PARTS REPLACEMENT

Many electrical and mechanical parts in Philips television sets have special safety related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. The use of a substitute part which does not have the same safety characteristics as the Philips recommended replacement part shown in this service manual may create shock, fire, or other hazards.

PRODUCT SAFETY GUIDELINES FOR ALL PRODUCTS

CAUTION: Do not modify any circuit. Service work should be performed only after you are thoroughly familiar with all of the following safety checks. Risk of potential hazards and injury to the user increases if safety checks are not adhered to.

USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING.

PREVENTION OF ELECTROSTATIC DISCHARGE (ESD)

Some semiconductor solid state devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices, Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage caused by electrostatic discharge (ESD).

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap, which should be removed for potential shock reasons prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified as "antistatic (ESD protected)" can generate an electrical charge sufficient to damage ES devices.

5. Do not use Freon propelled chemicals. These can generate electrical charges sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it (most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed.

CAUTION: Be sure no power is applied to the chassis or circuit and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your feet from a carpeted floor can generate static electricity (ESD) sufficient to damage an ES device.)

NOTE to CATV system Installer:

This reminder is provided to call the CATV system installer's attention to article 820-22 of the NEC that provides guidelines for proper grounding and, in particular, specifies that the cable ground shall be connected to the grounding system of the building, as close to the point of cable entry as practical.

PRACTICAL SERVICE PRECAUTIONS

IT MAKES SENSE TO AVOID EXPOSURE TO ELECTRICAL SHOCK. While some sources are expected to have a possible dangerous impact, others of quite high potential are of limited current and are sometimes held in less regard.

ALWAYS RESPECT VOLTAGES. While some may not be dangerous in themselves, they can cause unexpected reactions – reactions that are best avoided. Before reaching into the powered color TV set, it is best to test the high voltage insulation. It is easy to do, and is just a good service precaution.

BEFORE POWERING UP THE TV WITH THE BACK OFF (or on a test fixture), attach a clip lead to the CRT DAG ground and to a screwdriver blade that has a well insulated handle. After the TV is powered on and high voltage has developed, probe the anode lead with the blade, starting at the bottom of the High Voltage Transformer (flyback – IFT). Move the blade to within two inches of the connector of the CRT. IF THERE IS AN ARC, YOU FOUND IT THE EASY WAY, WITHOUT GETTING A SHOCK! If there is an arc to the screwdriver blade, replace the High Voltage Transformer or the lead, (if removable) whichever is causing the problem.

PICTURE TUBE REPLACEMENT PROCEDURE

Note: a. Two (2) people are required to handle this picture tube. b. Safety Glasses must be worn during this procedure or whenever directly handling a picture tube. c. Take care in each step not to damage the CRT or the cabinet.

1. Remove the Chassis and the CRT Socket Board Module from the cabinet.

2. A furniture pad or blanket should be positioned on the floor to support only the CRT Face. This pad or blanket should be high enough to keep the CRT Face approximately 12 to 14 inches off the floor.

3. Using two people, place the cabinet in a front down position with the CRT Face on the pad or blanket.

4. Place padded blocks under each corner of the cabinet to keep it from rocking.

5. Remove the four screws, at the corners of the CRT.

6. With two people lowering the cabinet to the floor, leave the CRT elevated by the pad or blanket.

Note: Take care not to grasp the neck of the CRT during this procedure, as it is extremely fragile.

7. Two (2) people may then lift the CRT from the cabinet.

8. Remove the degaussing coil from the defective CRT and mount on the replacement. Take care to maintain the exact shape and fit.

To install the new CRT, reverse steps 1 to 7.

Technical Specifications and Connections

Note: Described specifications are valid for the whole product range.

Technical Specifications

Reception

Feature Data

Tuning system

Color systems

Sound systems

Channel selections

IF picture carrier

Aerial input

A/V Connections

: PLL

: NTSC M/N

: BTSC non-DBX

BTSC DBX

: 181, full cable

: 45.75 MHz

: 75 Ohm, F-type

: NTSC M/N

Miscellaneous

Audio output:

Feature Data

Stereo versions

Mono versions

Power supply:

Feature Data

: 2 x 1 W

2 x 3 W 2 x 5 W 2 x 10 W

: 1 x 1 W

1 x 3 W 1 x 4 W 2 x 2 W

Mains voltage range

Mains frequency

: 90 - 140 VAC

: 60 Hz

Ambient conditions:

Feature Data

Temperature range

Maximum humidity

Power consumption:

Feature Data

Normal operation

Standby

: +5 to +45 deg. C

: 90 % R.H.

: from 81 W (20”)

to 145 W (32”)

: < 3 W

Connections

Front or Top Control / Front or Side Connections

Figure: Front/Top control and Side I/O

Audio / Video In

1 Vpp / 75 Ohm

Connector Kind Value Symbol

Video

Audio - L

Audio - R

Headphone (3.5 mm)

Rear Connections

0.2 Vrms / 10 kOhm

8 - 600 Ohm / 4 mW

Figure: Rear connections

Monitor Out

Connector Kind Value Symbol

Video (CVBS)

Audio - L

Audio - R

1 Vpp / 75 Ohm

0.5 Vrms / 1 kOhm

YUV In

Connector Kind Value Symbol

AV1 In

Connector Kind Value Symbol

Video (CVBS)

Audio - L

Audio - R

0.7 Vpp / 75 Ohm

1 Vpp / 75 Ohm

0.5 Vrms / 10 kOhm

AV2 In

Connector Kind Value Symbol

Video (CVBS)

Audio - L

Audio - R

1 Vpp / 75 Ohm

0.5 Vrms / 10 kOhm

AV2 In (SVHS)

Connector Kind Value Symbol

Ground

GND

1 Vpp / 75 Ohm

0.3 Vpp / 75 Ohm

Mechanical Instructions

Index of this chapter:

1. Set Disassembly

2. Service Positions

3. Assembly/Board Removal

4. Set Re-assembly

Note: Figures below may deviate slightly from the actual product, due to different set designs.

Set Disassembly

1. Remove all screws from the back cover (do not forget the screws that hold the

rear connection panel).

2. Pull the back cover backward to remove it.

Service Positions

There are 2 service positions possible.

Family Board without bracket (with integrated 'control').

1. Disconnect the strain relief of the AC power cord.

2. Remove the mono carrier, by pushing the two center clips outward [1]. At the

same time pull the panel away from the CRT [2].

3. Disconnect the degaussing coil by removing the cable from (red) connector 0212.

4. Turn the panel 90 degrees counter clockwise [3].

5. Flip the panel 90 degrees [4], with the components toward the CRT.

6. Turn the panel with its rear connections toward the CRT [5].

7. Slide the metal heatsink (near the mains transformer 5520) underneath the right

chassis bracket. This secures the panel [6].

Figure: Service position (1)

Family Board with bracket (with separate 'control').

1. Disconnect the strain relief of the AC power cord.

2. Disconnect the degaussing coil by removing the cable from (red) connector 0212

[1].

3. Remove the panel bracket from the bottom tray, by pulling it backward [2].

4. Turn the chassis tray 90 degrees counter clockwise.

5. Move the panel to the left and flip it 90 degrees [3], with the components toward

the CRT.

6. Turn the panel with the rear jack panel toward the CRT.

7. Place the hook of the tray in the hole in the cabinet bottom [4] and slide the panel

backward to lock it in the service position.

Figure: Service position (2)

Assembly/Board Removal

Comb Filter Assembly/Board (if present)

You can remove the Comb Filter panel from the family board by disconnecting it from connector 1810 (located at the top of the AC power transformer 5520).

Top Control Assembly/Board (if present)

Figure: Top control removal

1. Remove the two screws (if present).

2. Pull the module down and backward (release it from the front hinge [M]).

3. Lift the board from its bracket while releasing the two fixation clamps. The board

hinges on the other side.

Front Interface Assembly/Board (if present)

Figure: Front interface removal

1. You can remove the complete module from the bottom plate, by pulling the two

clamps upward [1[ while sliding the module away from the CRT [2].

2. Release the 2 clamps [3] at the side of the bracket, and lift the board out of the

bracket (it hinges at one side).

DAF Assembly/Board (if present)

Figure: DAF panel removal

1. You can remove the complete module from the family board bracket, by pressing

the clamp downward [1] while sliding the module toward the CRT [2].

2. Release the 2 clamps [3] to lift the board out of the bracket [4].

Side Jack Panel Assembly/Board (if present)

Figure: Side jack panel removal

1. You can remove the complete side jack panel assembly by removing the 2

screws.

2. Release the 2 clamps to lift the board out of the bracket.

Set Re-assembly

Before replacing the back cover, check the following:

1. Be sure the AC power cord is mounted correctly in its guiding brackets.

2. Re-place the strain relief for the AC power cord into the cabinet.

3. Be sure all cables are returned to their original positions.

Service Modes, Error Codes and Fault Finding

Index:

1. Supporting Overviews

2. Test Points.

3. Service Modes.

4. Problems and Solving Tips (related to CSM).

5. ComPair.

6. Error Codes.

7. The Blinking LED Procedure.

8. Protections.

9. Repair Tips.

Supporting Overviews

• Block Diagram

• I2C and Supply Voltage Diagram

• Test point Overview Mono Carrier

• Test point Overview CRT panel

Test Points

The chassis is equipped with test points printed on the circuit board assemblies. These test points refer to the functional blocks:

Table: Test point overview

Test point Circuit Diagram

A1-A2-A3-.... Audio processing A8, A9 / A11

C1-C2-C3-.... Control A7

F1-F2-F3-.... Frame drive and output A3

I1-I2-I3-.... Tuner & IF A4

L1-L2-L3-... Line drive and output A2

P1-P2-P3-.... Power supply A1

S1-S2-S3-.... Synchronization A6

V1-V2-V3-.... Video processing A5, B1

The numbering is in a logical sequence for diagnostics. Always start diagnosing within a functional block in the sequence of the relevant test points for that block. Perform measurements under the following conditions:

• Television set in Service Default Alignment Mode.

• Video input: Color bar signal.

• Audio input: 3 kHz left channel, 1 kHz right channel.

Service Modes

Service Default Alignment Mode (SDAM) offers several features for the service technician, while the Customer Service Mode (CSM) is used for communication between the servicer and the customer.

The L01.1U AC chassis also offers the option of using ComPair, a hardware interface

TDA9587

TDA9588

TDA9577

between a computer and the TV chassis. It offers the abilities of structured troubleshooting, error code reading, and software version readout for all L01.1U AC chassis. Minimum requirements for ComPair: a Pentium processor, a Windows OS, and a CDROM drive (see also “ComPair” section).

Table: Software cluster overview

SW Cluster SW name

L3LUS1 L01US2x.y

L3LUN1 L01UN4x.y

L3LUN2 L01UN5x.y

Abbreviations in Software name: U =

UOC type

UOC Diversity

64K ROM Size

55K ROM Size

Special Features

Stereo dBx, Comb Filter

Stereo non-dBx

USA (NAFTA), M = Mono, N = Stereo non-dBx and S = Stereo dBx.

Service Default Alignment Mode (SDAM)

Purpose

• To create a predefined setting for measurements to be made.

• To override software protections.

• To start the blinking LED procedure.

• To change option settings.

• To display / clear the error code buffer.

• To perform alignments.

Specifications

• Tuning frequency: 61.25 MHz (channel 3).

• Color system: NTSC M.

• All picture settings at 50% (brightness, color contrast, hue).

• Bass, treble and balance at 50 %; volume at 25 %.

• All service-unfriendly modes (if present) are disabled. The service unfriendly

modes are:

§ Timer / Sleep timer.

§ Child / parental lock.

§ Blue mute.

§ Hotel / hospital mode.

§ Auto shut off (when no 'IDENT' video signal is received for 15 minutes).

§ Skipping of non-favorite presets / channels.

§ Auto-storage of personal presets.

§ Auto user menu time-out.

§ Auto Volume Leveling (AVL).

• Run timer (maximum four digits displayed)

• Software version

• Option settings

• Error buffer reading and erasing

• Software alignments

How to enter

To enter SDAM, use one of the following methods:

• Press the following key sequence on the remote control transmitter: '0 6 2 5 9 6'

directly followed by the 'MENU' button (do not allow the display to time out between entries while keying the sequence).

• Short jumper wires 9631 and 9641 on the family board (see Fig. 8-1) and apply

AC power. Then press the power button (remove the short after start-up). Caution : Entering SDAM by shorting wires 9631 and 9641 will override the +8Vprotection. Do this only for a short period. When doing this, the service-technician must know exactly what he is doing, as it could damage the television set.

• Or via ComPair (with the ComPair 'Tools' RC7150 Service Remote, it should be

possible to enter SDAM via the ComPair interface).

After entering SDAM, the following screen is visible, with S in the upper right corner of the screen to indicate that the television is in Service Default Alignment Mode.

Figure: SDAM menu

+ 615 hidden pages