Philips PS1966C122, Technical Service Data

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Y is the sub version number (Ex: 2)
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the main version number is updated with a major change of specification (incompatible with the
previous software version)
−
the sub version number is updated with a minor change (backwards compatible with the previous
versions)
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if the main version number changes, the new version number is written in the EEPROM
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if the main version number changes, the default settings are loaded
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if the sub version number changes, the new version number is written in the EEPROM
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if the EEPROM is fresh, the software identification, version and cluster will be written to EEPROM
−
Note: a new micro controller is considered to be compatible if it works instead of the old software and
the functionality is not significantly changed.
Error Buffer
Error codes are required to indicate failures in the television. For intermittent complaints, always check
the error buffer. A unique error code is available for:
•
activated protection (error codes 1, 2, and 3)
•
failing I2C device
•
general I2C error
•
RAM failure (e.g. internal RAM of microprocessor (IC 7600) )
Other error codes are:
•
Signal processor (IC 7250) start-up error
•
EEPROM check-sum error
The last five errors, remembered in the EEPROM, are shown in the service menu. This is called the error
buffer.
The error that is found last is displayed on the left, except when protection (1 to 3) is active.
Errors 1, 2, and 3 are often shown at the right of the error buffer display whenever they are detected.
Example 1:
Suppose the display shows: 8 – 11 – 2– 0 – 0
With 2 displayed at the right of the error buffer, high beam current protection is active.
Example 2:
Suppose the display shows: 11 – 4 – 5– 3 – 0
With 3 displayed at the right of the error buffer, vertical protection is active.
The following error codes have been defined:
Error Code Table
0 = No error
1 = X-Ray / overvoltage protection active
2 = High beam current (BCI) protection active
3 = Vertical protection active
4 = I²C error while communicating with the sound processor (IC 7803)
5 = Signal processor (IC 7250) start-up error
6 = I²C error while communicating with the signal processor IC (IC 7250)
7 = General I²C error *
8 = Internal RAM error micro controller
9 = EEPROM Configuration error (Checksum error)
10 = I²C error, EEPROM error
11 = I²C error, PLL tuner
Note: I²C = (SCL/SDA)