Acer P244W, Service Manual

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(b) IC introduction:
1.) DDC (Display Data Channel) function: We use DDC IC to support DDC2Bi function. DDC
data is store in 24C02 (EEPROM). Those data related to LCD monitor specification. PC
can read them by “SDA” and “SCL” serial communication for I²C communication for
DDC2Bi.
2.) Scalar IC: There are A/D, TMDS receiver, HDCP, Scaling, info frame recognizer, OSD
and LVDS transmitter functions built-in the RTD2482D IC. Scaling IC is revolutionary
scaling and color engine, capable of expanding any source resolution to a highly uniform
and sharp image or down scaling, combined with the critically proven integrated 8 bit
triple-ADC and patented Rapid-lock digital clock recovery system. It also support detect
mode and DPMS control. RTD2482D is also MCU-embeeded.: Control unit, it controls all
the functions of this interface board, just like the OSD display setting, the adjustable
items, adjusted data storage, the external IIC communication, support DDC2Bi. .
3.) EEPROM: We use 24C016 to store all the adjustable data, user settings and HDCP Key
and use 3 of 24C02 to store HDMI x 2 and D-SUB EDID data.
A-2.) Control board introduction:
There are 5 keys for user's control which includes “Menu”, “Right”, “Left”, “Auto”, and
“Empowering”. The following descriptions are the introduction of these keys.
(1) “Menu” key: to enter sub-menus or select items.
(2) “Right” key: to select previous and to increase adjustment
(3) “Left” key: to select next and to decrease adjustment
(4) “Auto” key: to perform auto adjustment and Exit key
(5) “Empowering”: to Open the Acer eColor Management OSD and access the scenario
A-3.) LED board introduction:
(1) Power key: to turn/off power of monitor
(2) LED: It indicates the DPMS status of this LCD monitor; green light means DPMS on
(Normal operating condition). Amber light means DPMS off (Power Saving).