ICs used: TDA935X/6X/8X_AT24C08_TDA7449_TDA8356/N6_TDA7057AQ_STR-G5653/F6654_HEF4053_TDQ-5B6M
(Tuner) [Service Mode]
The super chips TDA935X/6X/8X are good in pins compatibility.
Differences among them are shown as follows.
TDA9351（48K）PAL/NTSC/SECAM+1 PAGE TELETEST
TDA9350（48K）PAL/NTSC+1 PAGE TELETEST
TDA9361（64K）PAL/NTSC/SECAM+10 PAGE TELETEST
TDA9360（64K）PAL/NTSC+10 PAGE TELETEST
TDA9380（32K）PAL/NTSC
TDA9387（32K）NTSC
The various versions of theTDA935X/6X/8X PS/N2 series
combine the functions of a TV signal processor together with a Controller and
US Closed Caption decoder. Most versions have a Teletext decoder on board. The
Teletext decoder has an internal RAM memory for 1or 10 page text. The ICs are
intended to be used in economy television receivers with 90 and 110 picture
tubes. The ICs have supply voltages of 8 V and 3.3 V and they are mounted in
S-DIP envelope with 64 pins.
CIRCUIT DIAGRAM_Full
PWB_MAIN
PWB_CRT
CLICK ON THE PICTURES TO MAGNIFY
Supply Voltage Adjustment
Caution: +B voltage has close relation to high voltage. To
prevent X-ray radiation, set +B voltage to the rated voltage.
Make sure that the supply voltage is within the range of the
rated value.
Connect a digital voltmeter to the +B voltage output
terminal of the TV set. Power on the TV and set the brightness and
sub-brightness to minimum.
Regulate voltage adjustment components on the power PCB to
make the voltmeter read 115±1V.
SERVICE MODE
* Set the volume to 0.
* Then press and hold the MUTE button on the remote control,
and press the MENU button on the TV to enter the SERVICE mode. (In this case,
the S mode cannot be stored in the EEPROM.
* To exit from the S mode, turn off the TV set)
* To exit from the S mode, turn off the TV set)
* After entering the S mode, Red “S”is displayed on the upper
centre of the screen and MENU-1 is default. Use the POS+/- buttons to highlight
an adjustment and the VOL+/- buttons to adjust it. The adjusted data are
immediately output and stored in the EEPROM.
* To write in logo, use the ▲/▼ ↑buttons to highlight an
adjustment and the ◄/► buttons to adjust.
Caution: The user service mode adjustment can be changed
only when service personnel adjust the whole set data during servicing. As the
control data have dramatic effects on functions and performance of the TV,
service personnel should not tell user how to enter the SERVICE mode to avoid
improper data settings.
