MAXDATA Belinea 101555, Service Manual

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MAXDATA Belinea 101555
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4. THEORY OF OPERATION
This section describes the function of the LCD monitor per functional block.
Belinea 101555 monitor includes MB board (including audio board function inside), inverter board, adapter
and button board.
4.1 MB BOARD
The MB board is a four-layer, single-landed design with ground and internal planes provided. DC power
from the power adapter enter the board through DC jack. Other connectors on the board are for inverter,
and button board .The VGA cable is a signal cable that contains video signal, sync signal and DDC
signal from PC VGA adapter.
The system board consists 3 functional areas: flat panel controller, micro-controller and power regulator.
4.1.1 Flat panel controller…… gmZAN2 (U1)
The heart of the system board is MRT MVZ. The MVZ is a graphics processing IC for LCD monitor
.
It provides all key IC functions required for LCD panel. On-chip functions include a high-speed
triple-ADC, PLL, high scaling engine, and OSD controller
.
a) Clock Generation :
Crystal Input Clock (TCLK and XTAL). This is the input pair to an internal crystal oscillator and
corresponding logic. A 20 MHz crystal is recommended
.
b) Hardware Reset ( Pin 155 )
Hardware Reset signal is generated by micro-controller (U1, pin 36). It assert a reset signal at least 100 ms.
c) Analog to Digital Converter
The MVZ chip has three ADC's (analog-to-digital converters), one for each color (red, green and blue)
The analog RGB signals are connected to MVZ as described below
Pin Name
48 Blue -
47 Blue +
54 Green -
53 Green +
60 Red -
59 Red +
Pin Number
d) Panel Power Sequencing ( VDDCTRL, INVCTRL) ( Pin20~21)
The MCU has two dedicated outputs VDDCTRL and INVCTRL ( Pin76 and Pin75) to control LCD power
sequencing once data and control signals are stable.
e) Panel interface (Pin 66~137)
The MVZ driver interface is highly programmable. It supports dual bus / dual port for XGA drivers.
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