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04 Troubleshooting
1. Common Acknowledge
1.1 Monitor Block Diagram
The LCD Monitor contains an interface board, and inverter/power keypad board and flat panel. In
Inverter/power/Audio board, power section supplies +14V & +5V for Inverter and Interface board used.
The inverter section drives the backlight of panel and the DC-DC conversion.
- 2 Interface BOARD DIAGRAM
1.3 Electronic Circuit Theory
1.3.1 Switching Mode Power Supply
1.3.1.1 AC Current Input Circuit
P801 is a connector for connecting AC Power. F801 is a fuse to protect all the circuit. AC input
voltage is from 90v to 264V. R801 and R802 joined between two inputting main circuit to prevent man
from shock. L801 is used to clear up low frequency wave. C801 and C802 are used to discharge the
waves that L801 produced. High frequency waves are damped by C801 and C802. D801 is a rectifier
Inverter/Power
(Including AC/DC Power
Supply , Inverter )
Interface Board
Keypad BD
Flat panel (LVDS interface) and CCFL
AC input
Range 100V~240V
Host computer
(VGA/DVI signal input and DDC)
Audio input
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