XOCECO LC15H3S, Service Manual

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Based on the computer features, set up the serial port(COM Port). Select corresponding serial port (if
it’s unable to FLASH WRITE, change to another port). Baud is selected to be 115200. Then select
Reset Target After Download. Click FLASH pushbutton, it’s ready to run. For other settings, please
refer to the Fig. Above (already defaulted by the system, normally no need to change).
4 Switch on TV set the FLASH write program begins to run;
5 After FLASH write is over, push button “cancel” will become flash. Then shut the main power supply
and it’s OK just switch it on again.
Note: Do not shut the power off or turn the TV set on during the FLASH write. Otherwise it may
lead to no way for flash to rewrite.
Simple introduction and work principle of LC15/17/20H3S
LC20H3 multi-media LCD TV broadcast receiver adopts LG 20.1 inch LCD display
screen as display unit. It has PAL/SECAM B/G,I,D K L L, color system receiving functions
and at the same time with AV input, S-VHS input, PC VGA connector and earphone output
and other signal connectors. The power supply is outer connection of 12V power supply
adaptor
LC15/17/20H3S multi-media LCD TV broadcast receiver consists of RF, video signal
board assy”, digit picture processing assy’.
RF signal produces picture IF signal and sound IF signal by tuner N201, through Video
and Sound saw filter Z201, Z202, and the signals are sent to Video/Sound(VIF/SIF) multi
systems signal processor of N202 TDA4470 pin6,pin7,and pin1,pin2, for picture and sound
demodulation. The demodulated composite signal, after trapping, is selected by the switch
N202, and then output to N303 and ICVCT3833 for decoding.
The composite video signal is sent through foot 19 of ICN303VCT3833. After
processing there, it is output as analog RGB signal from Pin42, PIN43, PIN44 to digit