This circuit diagram apply for LG Flatron Color Monitor L1720B CL-43 chassis. LG Flatron Color Monitor consists of three main parts, the Video Controller Part & Display Data Transmitter , Micom Part and Power Part.
The Video Controller Part & Display Data Transmitter Part (MST9111) amplifies the level of video signal for the digital conversion and converts from the analog video signal to the digital video signal using a pixel clock. The pixel clock for each mode is generated by the PLL. The range of the pixel clock is from 25MHz to 135MHz. This part consists of the Scaler. The Scaler gets the video signal converted analog to digital, interpolates input to 1280 x 1024 resolution signal and outputs 8-bit R, G, B signal to transmitter. Especially pre-amp / ADC / Video controller/ Transmitter are merged to one chip “MST9111” by MSTAR. This part transmit digital signal from the Scaler to the receiver of module.
The Micom Part, this Part consists of EEPROM IC which stores control data, Reset IC and the Micom. The Micom distinguishes polarity and frequency of the H/V Sync are supplied from signal cable. The controlled data of each modes is stored in EEPROM. The Power Part, this part consists of the one 3.3V and one 2.5 regulators to convert power which is provided 5V in LIPS Board. 5V is provided for LCD Panel. Also, 5V is converted 3.3V and 2.5V by regulator. Converted power is provided for IC in the main board.