Philips L7.3A Service Manual Download

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Faultfinding tree & Repair facilities

L7.3A

Explanation :

L73AP21 1.0: The software identification, version and cluster.
AS: A two character short name for the option to be selected.
(see table )
VALUE: The value of the selected option.
ERR: Error buffer display
3 4 3 0 0
S: The character " S " indicates that the TV set is in the service
mode.
9999: The hexadecimal value of the life timer.
8888 7777 66: 10 digits of value representation of the option
byte contents

5.5.1

Software identification

If there is a change of the software this number will be changed.

5.5.2

Life timer (run timer)

This life timer only counts the normal operations hours and not
the stand-by hours. Also at every switch- on the life timer is
incremented by 1.

5.5.3

Option code

The possible options are listed in the following table 1:

Error buffer

The last five errors, stored in the NVRAM=EEPROM (IC7620),
are shown in the service main menu; this is called the
errorbuffer. An error will be added to the buffer if this error
differs from the last error in the buffer. The last found error is
displayed on the left-side.

Example: Suppose the display shows: 3 4 0 0 0. This means
the last found error is error number 3, the last found error but
one is error number 4, and so on.

–

40000

–

34000

REMARKS: If the (IC7620=) EEPROM is replaced by a new
one the set has to be installed according to the option code.
The ERROR BUFFER will be erased when the set is switched
from service mode in stand by, or via DST code 99.

Error codes

The following error codes have been defined :

–

0 - No error

–

1 - Internal RAM

–

2 - General 12C error

–

3 - EEPROM Configuration error (Checksum error)

–

4 - I2C error (MSP3410 / TDA9850/TDA9860)

–

5 - I2C error (TDA8374)

–

6 - EEPROM error (ST24C04)

–

7 - I2C error (PLL tuner)

5.5.4

Error code indication via blinking stand by LED

The ERROR code are also indication via blinking of the
standby LED. This is important if no OSD function or picture is
available. The method is to show that the LED blinks as many
as the error code indicates..

Example: Error code 4 will result in four blinks of the LED ( 0.25
seconds ON and 0.25 seconds OFF).After this sequence the
LED will be OFF for 3 seconds and the blinking of the LED is
repeated again.

5.5.5

Option abbreviation and Option status.

To select another option abbreviation use the MENU UP/
DOWN buttons and to change the status use the MENU LEFT/
RIGHT buttons.

Elucidation: With above items the option statuses stored in the
EEPROM can be changed. This is necessary if the EEPROM
is replaced by a fresh EEPROM, because a fresh EEPROM is
initial loaded with default options by the uC. The options stored
in the factory can differ per type and stroke number. Therefore
it is necessary to load the EEPROM with the correct options
(configuration). These options are indicated on a sticker glued
inside on the rear cover of the set.

Remark: For sets with BTSC sound, also the options
TUN.FOA, TUN.FOB, EXT.FOA and EXT.FOB have to be set.
See for these items Paragraph 6

Loading a fresh EEPROM

•

Switch on the TV via the power switch.

•

Audio mute the TV (to get no big noise).

•

Change the option codes as indicated on the sticker on the
rear cover.

•

Put TV in stand by via the remote control.

•

Switch on the TV again via the remote control.