![background image](http://html1.mh-extra.com/html/viewsonic/vg700b-2/vg700b-2_service-manual_1021200013.webp)
VERTICAL:
Active Time = 1024 lines Blanking Time = 42 lines
Sync Offset = 1 lines Sync Pulse Width = 3 lines
Border = 0 lines Frequency = 60.0 Hz
Sync configuration: Digital separate, V(+), H(+)
(72-89) Monitor Description:
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Monitor S/N: A1K030100001
(90-107) Monitor Description:
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Monitor Range Limits:
Vertical Frequency (min) = 50Hz
Vertical Frequency (max) = 75Hz
Horizontal Frequency (min) = 30Hz
Horizontal Frequency (max) = 82Hz
Maximum Supported Pixel Clock = 140MHz
(108-125) Monitor Description:
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Monitor Name: VG700b-2
(127) Checksum OK
4-6. THEORY OF OPERATION
This section describes the function of the LCD monitor per functional block.
This monitor includes MB board, inverter board, adapter and button board.
1.1 MB BOARD
The MB board is a four-layer, single-landed design with ground and internal planes provided. DC power from the
power adapter enters the board through the DC jack. Other connectors on the board are for inverter, audio and button
board .The VGA cable is a signal cable that contains video signal, sync signal and DDC signal from PC VGA
adapter. This system board consists of 4 functional areas: flat panel controller, flash ROM, power regulator and
Audio amplifier
1.2 Flat panel controller… gm2121 (U2)
The heart of the system board is Genesis gm2121. The gm2121 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, OSD controller and on-chip micro controller.
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ViewSonic Corporation
9
Confidential
– Do Not Copy
VG700b-2