The factory mode is a special TV working mode intended to
help in the manufacturing process and it is identified on the screen with the
message “FAC”. This mode is never suited for customer use. The main differences respect to normal mode
are:
- The standby mode is always disabled.
- The Blue-back (no sync. signal present) is disabled.
- The customer adjustments ( volume, contrast …) work faster.
- The timer off works but it does not change to Stand-by mode.
- Change of programs and TV/AV swithing faster. Cancelled mute.
- In case of finding the TV set in Factory mode, it must be taken out of this state.
- To do so, enter the clock setting menu on the customer OSD and then exit.
SERVICE MODE
- Holding down the front key “VOL-” and simultaneously pressing the teletext green key from the remote control access the service menu. The service menu is a two level structure as shown in the diagram below.
- The active keys (local or remote) in service mode are: VOL-, VOL+, P-, P+, MENU and the digits. The navigation through this menu works the same than in the user menu.
- The P+ and P- keys allow to navigate through the options in the active menu.
- The VOL+ key opens the second level menu if available. If there is a highlighted adjustment, the VOL- and VOL+ keys allow to change it.
- The MENU key goes back one level menu. If the active menu is the main one, it exits the service mode.
- The digit keys allow direct entry for adjustments.
- The SERVICE mode is exited by pressing any other key.
CLICK ON PICTURES TO MAGNIFY
FACTORY DEFAULT DATA VALUES
SWITCH-ON SEQUENCE
In case of malfunction it is very important to know the
switch-on procedure:- When the reset is at low level the microprocessor begins to work.
- It recalls from NVM the last state before the switch-off.
- If it is STAND BY, it remains in STAND BY. If it is ON, it continues the switch-on procedure.
- It waits until a falling edge in the 16/9&BSYNC signal occurs.
- The port B_HIGH is set (B_HIGH oscillating).
- It waits until a rising edge in the 16/9&BSYNC signal occurs.
- It reads the CTL1 signal. If this signal doesn’t rise before 160mS the process is stopped indicating ERROR_4.
- The Video processor is started via I2C bus. If there isn’t any answer the process is stopped indicating ERROR_1.
- There is a 1 second delay.
- The deflections start. If there are failures the process is stopped indicating ERROR_2 or ERROR_3.
- It waits until the cathode heater is warm by inspection of the video processor register bit AKB.
- The picture and the sound are switched on and the procedure is finished.
PROTECT MODE & FAILURE INDICATIONS [ERROR CODES]
The microprocessor checks periodically the different parts
of the circuit and if it detects any fault in a safety defined part then it
puts the TV set in PROTECTED mode. The red LED indicates the found error code. The red indicator lamp flashes every 0,3
seconds and stops during 0,7 seconds. The number of flashes depends on the
error code.
The 1, 2, 5 and 6 error codes are read via the I2C Bus.
The 3 and 4 error codes are read through the CTL1, CTL2 and
-PD&FAIL signals.
In all cases except ERROR_5 the power supply is set in
SMPS_B_LOW state.
Protect mode inhibition
- In order to facilitate the TV set repair it is possible to disable the protect mode. By pushing the M key (PL100) in a fault detection situation, the microprocessor resumes normal execution flow except in ERROR_4 state (Power Supply Short-circuit). In this case the microprocessor keeps the power supply in MPS_B_LOW state (the M key does not act).
- When it is necessary to replace the IC800, it is strongly recommended to replace also the current sensor resistors R804 and R805 (they may be also damaged or altered).
- Keep in mind that when the power supply is forced to SMPS_B_HIGH state and without current consumption at the main output (deflection stopped), B6 is the stabilized output. The minimum voltage circuit is working and B6 can go down from the nominal 10 volts to 7,5 volts approximately. Also, in this situation B1 goes up until 160 - 180 volts in TV sets with 110º CRT.
- When the TV set starts up, the microprocessor checks the non-volatile memory in order to know if it has been initialized. Even if it detects no initialization it will continue the start up procedure with a minimum default adjustment values stored in ROM. Then, in case of NVM replacement, it is necessary to initialize the non-volatile memory from the SERVICE menu (it will load a complete set of default values) and afterwards adjust all the controls to its correct value.
