Philips 37PF7320/93 Spezifikationen PDF herunterladen (Seite 17)

Service Modes, Error Codes, and Fault Finding

EN 17LC4.9A AA 5.

Snowy Picture

Check CSM line 6. If this line reads “Not Tuned”, check the

following:

• Antenna not connected. Connect the antenna.

• No antenna signal or bad antenna signal. Connect a proper

antenna signal.

• The tuner is faulty (in this case line 2, the Error Buffer line,

will contain error number 10). Check the tuner and replace/

repair the tuner if necessary.

Black and White Picture

If:

• The picture improves after you have pressed the AUTO

PICTURE button on the remote control transmitter,

Then:

1. Press the AUTO PICTURE button on the remote control

transmitter repeatedly (if necessary) to choose

PERSONAL picture mode.

2. Press the MENU button on the remote control transmitter.

This brings up the normal user menu.

3. In the normal user menu, use the MENU UP/DOWN keys

to highlight the PICTURE sub menu.

4. Press the MENU LEFT/RIGHT keys to enter the PICTURE

sub menu.

5. Use the MENU UP/DOWN keys to select COLOR.

6. Press the MENU RIGHT key to increase the COLOR value.

7. Press the MENU button on the remote control transmitter

twice to exit the user menu.

8. The new PERSONAL preference value is automatically

stored.

Menu Text not Sharp Enough

If:

• The picture improves after you have pressed the AUTO

PICTURE button on the remote control transmitter,

Then:

1. Press the AUTO PICTURE button on the remote control

transmitter repeatedly (if necessary) to choose

PERSONAL picture mode.

2. Press the MENU button on the remote control transmitter.

This brings up the normal user menu.

3. In the normal user menu, use the MENU UP/DOWN keys

to highlight the PICTURE sub menu.

4. Press the MENU LEFT/RIGHT keys to enter the PICTURE

sub menu.

5. Use the MENU UP/DOWN keys to select PICTURE.

6. Press the MENU LEFT key to decrease the PICTURE

value.

7. Press the MENU button on the remote control transmitter

twice to exit the user menu.

8. The new PERSONAL preference value is automatically

stored.

5.4 Service Tools

5.4.1 ComPair

Introduction

ComPair (Computer Aided Repair) is a service tool for Philips

Consumer Electronics products. ComPair is a further

development on the European DST (service remote control),

which allows faster and more accurate diagnostics. ComPair

has three big advantages:

1. ComPair helps you to quickly get an understanding on how

to repair the chassis in a short time by guiding you

systematically through the repair procedures.

2. ComPair allows very detailed diagnostics (on I

C level) and

is therefore capable of accurately indicating problem areas.

You do not have to know anything about I

C commands

yourself because ComPair takes care of this.

3. ComPair speeds up the repair time since it can

automatically communicate with the chassis (when the

microprocessor is working) and all repair information is

directly available. When ComPair is installed together with

the Force/SearchMan electronic manual of the defective

chassis, schematics and PWBs are only a mouse click

away.

Specifications

ComPair consists of a Windows based fault finding program

and an interface box between PC and the (defective) product.

The ComPair interface box is connected to the PC via a serial

(or RS-232) cable.

For this chassis, the ComPair interface box and the TV

communicate via a bi-directional service cable via the service

connector(s).

The ComPair faultfinding program is able to determine the

problem of the defective television. ComPair can gather

diagnostic information in two ways:

• Automatically (by communicating with the television):

ComPair can automatically read out the contents of the

entire error buffer. Diagnosis is done on I

C/UART level.

ComPair can access the I

C/UART bus of the television.

ComPair can send and receive I

C/UART commands to

the microcontroller of the television. In this way, it is

possible for ComPair to communicate (read and write) to

devices on the I

C/UART buses of the TV-set.

• Manually (by asking questions to you): Automatic

diagnosis is only possible if the microcontroller of the

television is working correctly and only to a certain extent.

When this is not the case, ComPair will guide you through

the faultfinding tree by asking you questions (e.g. Does the

screen give a picture? Click on the correct answer: YES /

NO) and showing you examples (e.g. Measure test-point I7

and click on the correct oscillogram you see on the

oscilloscope). You can answer by clicking on a link (e.g.

text or a waveform picture) that will bring you to the next

step in the faultfinding process.

By a combination of automatic diagnostics and an interactive

question / answer procedure, ComPair will enable you to find

most problems in a fast and effective way.

How to Connect

This is described in the chassis faultfinding database in

ComPair.

Caution: It is compulsory to connect the TV to the PC as

shown in the picture below (with the ComPair interface in

between), as the ComPair interface acts as a level shifter. If

one connects the TV directly to the PC (via UART), ICs will be

blown!

Figure 5-5 ComPair interface connection

E_06532_021.eps

180804

PC VCR I

CPower

9V DC

UART SERVICE

CONNECTOR

C SERVICE

CONNECTOR

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