Service Modes, Error Messages, and Repair Tips
EN 23LC03E 5.
The contents of the error buffer can also be made visible
through the “blinking LED” procedure. This is especially useful
when there is no picture. See paragraph 5.4 “The blinking LED
procedure “.
5.3.2 Error Codes
In case of non-intermittent faults, clear the error buffer before
starting the repair, to prevent that “old” error codes are present
(it is wise to write down the content of the error buffer before
you clear it). If possible check the entire content of the error
buffers. In some situations an error code is only the result of
another error code (and not the actual cause).
Note: a fault in the protection detection circuitry can also lead
to a protection.
Table 5-1 Error codes
TV-Board
Errors
• Error 0 = No error
• Error 4 = +5V protection. 5V protection active; set is
switched to protection; error code 4 is placed in the error
buffer; the LED will blink 4 times (repeatedly). A 5V failure
can cause a drop in the 5V supply output, resulting in an
undefined behaviour of the set. Therefore, all I2C devices
connected to the 5V supply are constantly monitored.
When none of these devices responds to the micro
controller for a prolonged time, the micro controller
assumes that there is a failure in the 5V supply. By starting
up the set with the service jumpers shorted, the 5V
protection is disabled and it is easier to determine the
cause. +5V protection will be activated when these I2C
devices fail (no I2C communication):
– Main Tuner 1100 (diagram A3)
– ITT sound processor MSP34xx IC-7620 (diagram A8)
Service tips: To isolate the problem area after overriding the
+5V protection, determine whether:
1. The +5V source is working properly IC7930 (diagram A10)
2. ITT sound processor circuit is loading the +5V; isolate coil
5620 (diagram A8)
3. The audio delay IC 7601 - IC7605 is loading the +5V
source; isolate coil 5601 (diagram A7)
4. Main tuner circuit is loading the +5V source; isolate coil
5122 (diagram A3)
Caution: Overriding the 5V protection when there is a 5V
failure can increase the temperature in the set and may cause
permanent damage to components. Do not override the 5V
protection for a prolonged time.
• Error 6 = General I2C error. This will occur in the following
cases:
– SCL or SDA is shorted to ground
– SCL is shorted to SDA
– SDA or SCL connection at the micro controller is open
circuit.
• Error 8 = BOCMA IC TDA888xx (diagram A4) I2C
communication failure. BOCMA (IC7301 on TV board) is
corrupted or the I2C line to the BOCMA is low or no supply
voltage present at pin 14 (3V3) or no supply voltage at pin
23.
• Error 9 = BOCMA IC TDA888xx 8V failure (SUP bit). No
supply voltage at pin 53. Check coil 5302.
• Error 10 = NVM I2C error (diagram A1). NVM (EEPROM -
IC7066) does not respond to the micro controller.
• Error 11 = Micro controller / NV Memory identification error.
During the last start-up the NVM and the micro controller
did not recognize each other (e.g. one of them was
replaced or the NVM memory has been changed/adapted
or lost), therefore the NVM was loaded with default values.
• Error 12 = Microprocessor (Painter - IC 7064) internal RAM
test failure.
• Error 13 =Main Tuner I2C failure UR13xx. Tuner (item
1100, diagram A3) is corrupted or the I2C line to the tuner
is low or no supply voltage at pin 3, pin 6 or 7 of the tuner.
• Error 14 =Sound processor I2C error IC7620 (MSP34xx,
diagram A8). Sound controller does not respond to the
micro controller.
• Error 15 =SRAM IC CY7C1019 test failure (IC7070,
diagram A2).
Note: Only for Europe and AP-PAL execution.
Scaler Board
When the TV detects critical errors from the Scaler board, it will
shutdown into protection mode. After a short period of time, the
LED will blink according to the respective error codes.
Error
code
Error description Possible defective
components
Dia-
gram
0 No error detected - ----
1-3 Reserved
4 5V protection active IC7930 or +5V I2C
devices
A3, A8,
A10
5 Reserved
6 General I2C bus er-
ror
I2C bus s/c or o/c
7 Reserved
8 BOCMA I2C error IC 7301 A4
9 BOCMA 8V supply
failure
IC 7910 or IC7301 A4, A10
10 NVM I2C error IC 7066 A1
11 NVM identification
failure
IC 7066 A1
12 uProcessor internal
RAM test failure
IC 7064 A1
13 Tuner I2C error IC 1100 - UR13xx A3
14 Sound processor
I2C error
IC 7620 (MSP34xx) A8
15 SRAM I2C error IC 7070 A2
16 Reserved
17# 3D CF processor
I2C error
IC 7823 B
18-20 Reserved
21 Scaler protection
active
IC 7402 C4
22 Scaler protection
active
IC 7351 C9
23 Scaler protection
active
IC 7302 C3
24* HDTV decoder I2C
error
IC 7252 C10
25 Scaler protection
active
IC 7752 C8
26 Reserved
27 Scaler protection
active
IC 7471 C6
28 Scaler protection
active
IC 7472 C6
29 Scaler uP I2C error IC 7753 or IC 7064 C8, A1
* = Not applicable to Europe execution# = Only for NAF-
TA 23" execution
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