Tuesday, 26 February 2019

HOW TO ENTER SERVICE MODE TO VIDEOCON - 3643R.

HOW TO ENTER SERVICE MODE TO VIDEOCON - 3643R.





To enter service mode. press the "Hidden" key at the botton right corner of the remote handset. The folloing will be displayed.

[1] SVR MODE
[2] DESIGN MODE
[3] FACTORY SHIPPING
[4] MFG MODE
[5] TEST PATTERN 0
[6] HEAT RUN: OFF
[7]QC SHIPPING.

* Press key [1] on the remote control, to enter into service mode.
* Press key [2] on the remote control, to go to design mode.
* Press key [5] to get various test patterens on screen.  repeated pressinng this key will cycle through various other test patterns.
* The parameters to adjust can be selected by pressing CH UP & CH DN buttons.
* To adjust the data value use Vol+ & Vol-ve buttons.
***** To exit from service mode, press [service] key once again, or switch OFF the set by its front pane power ON/OFF switch.

The numbers of ICs used in this set are:

TEA 7439 (Sound processor)
8803 CPBNG3VN7-236KC ( Video, chroma microcomputer jungle.)
TDA 7297 (dual Channel audio output)
LA 78041 (Vertical Output)
5Q0765RT (POWER REGULATOR)
PC-17K1 (OPTOCOUPLER)
KA 431LZ (ERROR DETECTOR)
24C16 (MAIN SYSTEM MEMORY)
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