EDP Controller Board HDMI(2560x1440@60Hz) VGA(1920x1080@60Hz) kit LED for 27" LM270WQ1-SDC2 2560X1440 Panel
The board kits can be fit for the following LCD:
LM270WQ1-SDA1
LM270WQ1-SDA2
LM270WQ1-SDC2
LM270WQ1-SDD2
LM270WQ1-SDDB
Kind note:
All the signals will be transmitted from the HDMI port on the PC/notebook to the eDP board, then to the T-CON board at the LCD's back, then to the LCD.
If the LCD only works at 640x480 resolution , your T-CON board is a bad one. It has to be replaced with a working one.