Philips 21PT5458/01 Service Manual Download

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Service Modes, Error Codes, and Fault Finding

EN 9

L04E AA

Service Modes, Error Codes, and Fault Finding

Index:

Test Points.

Service Modes.

Problems and Solving Tips (related to CSM).

ComPair.

Error Codes.

The Blinking LED Procedure.

Protections.

Repair Tips.

5.1

Test Points

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

Table 5-1 Test point overview

Perform measurements under the following conditions:

•

Television set in Service Default Alignment Mode.

•

Video input: Colour bar signal.

•

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

5.2

Service Modes

Service Default mode (SDM) & Service Alignment Mode (SAM)
offers several features for the service technician, while the
Customer Service Mode (CSM) is used for communication
between the call centre and the customer.

This chassis also offers the option of using ComPair, a
hardware interface between a computer and the TV chassis. It
offers the abilities of structured troubleshooting, error code
reading, and software version readout for all these chassis.
Minimum requirements for ComPair: a Pentium processor, a
Windows OS, and a CD-ROM drive (see "ComPair" section).

Table 5-2 Software cluster overview

5.2.1

Service Default Mode (SDM)

Purpose

•

To create a predefined setting for measurements to be
made.

•

To override software protections.

•

To start the blinking LED procedure.

Specifications

•

Tuning frequency: 475.25 MHz.

•

Colour system: PAL/SECAM.

•

All picture settings at 50%

(brightness, colour 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-favourite presets / channels.

–

Auto-storage of personal presets.

–

Auto user menu time-out.

–

Auto Volume Levelling (AVL).

How to enter
To enter SDM, 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 9252 and 9275 on the family board (see
Fig. 8-1) and apply mains. Then press the power button
(remove the short after start-up).
Caution: Entering SDM by shorting wires 9252 and 9275
will override the +8V-protection. 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’, it should be
possible to enter SDM via the ComPair interface).

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

Test point

Circuit

Diagram

F508, F535, F536, F537, F552, F561, F563,
F573, F664,I513, I518, I519, I524, I531, I533,
I546

Power supply

F401, F412, F413, F414, F418, F452, F453,
F455, F456, F458, F459, F460, F461, I408,
I416, I417, I420, I462, I468

Line + Frame
Deflection

F003, F004, I001, I002

Tuner IF

F201, F203, F205, F206

Hercules

F240, F241, F242