Service Modes, Error Codes, And Faultfinding - Philips LC4.2E Service Manual

5. Service Modes, Error Codes, and Fault Finding
Index of this chapter:
1. Test Points
2. Service Modes
3. Problems and Solving Tips (related to CSM)
4. ComPair
5. Error Codes
6. The Blinking LED Procedure
7. Fault Finding and Repair Tips
8. Power Supply
5.1
Test Points
This chassis is equipped with test points in the service printing.
In the schematics test points are identified with a rectangle box
around Fxxx or Ixxx. These test points are specifically
mentioned in the service manual as "half moons" with a dot in
the centre.
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) and 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 chassis.
Minimum requirements for ComPair: a Pentium processor, a
Windows OS, and a CD-ROM drive (see also paragraph
"ComPair").
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.
•
To inspect the error buffer.
•
To check the life timer.
Specifications
•
Tuning frequency: 475.25 MHz.
•
Colour system: PAL-BG.
•
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).
Service Modes, Error Codes, and Fault Finding LC4.2E AA
How to enter
To enter SDM, use one of the following methods:
•
Press the following key sequence on the remote control
transmitter: "062596" directly followed by the MENU button
(do not allow the display to time out between entries while
keying the sequence).
•
Short "Service" jumpers on the TV board during cold start
and apply mains (see Figure "Service jumpers"). Then
press the mains button (remove the short after start-up).
Caution: Entering SDM by shorting "Service" jumpers 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.
1
Figure 5-1 E Service jumpers
5. EN 11
E_14490_056.eps
070504