Diamond View DV154, Руководство по обслуживанию

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DV154/154B LCD Monitor Service Guide
Circuit operation theory
2
III. Circuit operation theory:
A.) HEAD:
A-1.) Interface board diagram:
Interface Board
Red
Green
Blue
Vsync
Hsync
(/H+V)
PC_Hsyn
A/D
&
Scaling
&
OSD
MCU
To
LCD
module
EE
P
R
O
M
SCL
SDA
SYNC INV
Vblank
VBLANK
(a) Circuit operation theory:
A basic operation theory for this interface board is to convert analog signals of Red, Green
and Blue to digital signals of Red, Green and Blue. The scaling IC has internal A/D converter,
internal OSD and auto detect input timing functions. A/D converter is convert analog signal to
digital data. OSD is offering adjustable functions to end-user. Detect timing is for detect change
mode. Finally the scaling IC outputs the digital R, G, B data, the H-sync, V-sync, data enable and
pixel clock to TCON (Timing controller). After TCON processing data, data will output to driver
of panel. MCU offers H/W DDC2 function & controls system processing. EEPROM is stored
DDC data, OSD common data and user mode data.
(b) IC introduction:
1.) DDC (Display Data Channel) function: We use MYSON MTV312 to support DDC/2B function.