4.10.1 Board Number
Board Number 6870C-3500C，the TCON board frequently-used by LG HD screen of 32 to 55 inch.
4.10.2 Chip Instruction
BUF16821 internal ROM has two Banks,but only use one group of them actually,there is the
configured data of 36 bytes for each group,which control the two groups of VCOM and the 16 path
GAMMA calibrating voltage value by change the internal DAC’s output voltage.
When the internal procedure lost or the chip is damaged or changed,we have to rewrite the
configured data to work again normally,the procedure can be read from the good board but please
pay attention that if the board numbers are the same,different sizes can’t be interchanged
currently,different types but with same size can’t be interchanged sometimes also,please refer to
the actual test result.
The actually read file is 40 bytes, 0x00 - 0x1F is the 16 group DAC value；0x24 - 0x27 is the VCOM
value of left and right path；0x20 - 0x23 is the reserved bytes.
4.10.3 Line Connection Mode
Read&Write Line Connection------LG 32 to 52 inch HD screen TCON board’s screen line port with
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