Service Modes, Error Codes, and Fault Finding
5.
Table 5-1 Error Table
Note
: Error codes 1, 6, or 18 are protection codes and in this
case, supplies of some circuits will be switched “OFF”. Also, in
protection, the LED will blink the number of times equivalent to
the most recent error code.
5.6
The Blinking LED Procedure
5.6.1
Introduction
Via this procedure, you can make the contents of the error
buffer visible via the front LED. This is especially useful for fault
finding, when there is no picture.
When the SDM is entered, the front LED will show (blink) the
contents of the error-buffer. Error-codes > 10 are shown as
follows:
–
A long blink of 750 ms (which is an indication of the decimal
digit),
–
A pause of 1.5 s,
–
“n” short blinks (where “n” = 1 - 9),
–
When all the error-codes are displayed, the sequence
finishes with a LED blink of 3 s,
–
The sequence starts again.
Example:
Error 12 9 6 0 0.
After activation of the SDM, the front LED will show:
–
1 long blink of 750 ms (which is an indication of the decimal
digit) followed by a pause of 1.5 s,
–
2 short blinks followed by a pause of 3 s,
–
9 short blinks followed by a pause of 3 s,
–
6 short blinks followed by a pause of 3 s,
–
1 long blink of 3 s to finish the sequence,
–
The sequence starts again.
Note
: If errors 1, 6, or 18 occur, the LED always gives the last
occurred error even if the set is NOT in service mode.
5.6.2
How to Enter
Use one of the following methods:
•
Enter the SDM (only via soldering pads marked “SDM” on
SSP). The blinking front LED will show the entire contents
of the error buffer (this works in “normal operation” mode
and in “protection” mode).
•
Transmit the commands “MUTE” -
“062500”
- “OK” with a
normal RC. The complete error buffer is shown. Take
notice that it takes some seconds before the blinking LED
starts.
•
Transmit the commands “MUTE” -
“06250x”
- “OK” with a
normal RC (where “x” is a number between 1 and 5). When
x= 1 the last detected error is shown, x= 2 the second last
error, etc.... Take notice that it takes some seconds before
the blinking LED starts.
•
“DIAGNOSE X” with the DST-emulation feature of
ComPair (where “x” is a number between 1 and 5). When
x= 1 the last detected error is shown, x= 2 the second last
error, etc.... When x = 0 all errors are shown.
5.7
Protections
5.7.1
Introduction
This chassis has only one microprocessor (OTC), which
remains active during Standby. This because power of the
microprocessor and the attached memory chip set is coming
from the 3V3 supply, which is derived from the 5V Standby-
circuitry. Therefore, in both Power-on as in Standby “power-off”
mode, the microprocessor is connected to this power supply.
If a fault situation is detected, an error code will be generated
and if necessary, the set is put in protection mode. The
protection mode is indicated by the blinking of the front LED at
a frequency of 3 Hz (or by a coded blinking in special cases).
The content of the error buffer can be read via the service menu
(SAM), the blinking LED procedure or via DST/ComPair.
To get a quick diagnosis, this chassis has three service-modes
implemented:
•
The
Customer Service Mode
(CSM).
•
The
Service Default Mode
(SDM). Start-up of the set in a
predefined way.
•
The
Service Alignment Mode
(SAM). In this mode, items
of the set can be adjusted via a menu.
You can enter both SDM and SAM modes via the “service
pads” on the SSP, via an RC-transmitter, or via ComPair. It is
not possible to enter the SAM in “standby”; the TV has to be in
“normal operation” mode.
The “Protection Diagram” shows the structure of the protection
system. See diagram below.
Error Device
Description
Def. item Def. Module indication
Diagram
1
M24C32
NVM, spontaneous blinking error 1
7011
Control
B5a
3
SAA4978
PICNIC
7713
Feature Box
B3a
4
Supply 5 V
5V protection
+5V Supply
B5a
5
Supply 8 V
8V protection
+8V Supply
B5a
6
Slow I2C bus blocked Spontaneous blinking error 6
Slow I2C Blocked
8
TDA932x
HIP High-end Input Processor
7323
Chroma IF IO
B2
13
UV1318/...
Tuner protection
1T01
Tuner
B13
14
MSPxxxx
ITT sound processor
7A02
Audio module
B6a
15
UPD64083
3D Comb
7B00
Video controller
B11
18
Fast I2C bus blocked
Spontaneous blinking error 18
Fast I2C Blocked
21
M62320P
I/O Expander
7P56
Video Dual Screen
B15b
26
SAA4992
Falconic
7718
+3V (FBX) Supply
B3b
27
T8F24EF
Eagle
7724
+3V (FBX) Supply
B3c
32
M29W400BT
Flash Ram (EPG)
7012
EPG Memory
B5a
53
AD9883A
AD converter 2fh input
7L01
HD
B19c
55
DC/DC converter
One of the voltages is not ok + protection error
Supply
56
EPLD
EPLD error
7V01
Video control
B19d,f
76
-
Audio DC protection
-
-
A
83
TEA6422
Source select matrix audio
7I17
Audio Source Select
B14d
FTL13U_AA_AB_312278513481.book Page 27 Thursday, December 30, 2004 1:50 PM