AOpen OpenBook 1556, Service Manual

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Chapter 1 25
NOTE: DC-AC inverter is used to generate very high AC voltage, then support to LCD CCFT backlight user,
and is also responsible for the control of LCD brightness. Avoid touching the DC-AC inverter area while
the system unit is turned on.
NOTE: There is an EEPROM in the inverter, which stores its supported LCD type and ID code. If you replace
a new inverter or replace the LCD with a different brand, use Inverter ID utility to update the ID
information.
DC-AC LCD Inverter
Item Specification
Vendor & model name Ambit T62I194.06
Sumida TWS-458-017
Input voltage (V) Ambit 8.5 (min.) - 21 (max.)
Sumida - 12 (typ.) -
Input current (mA) Ambit - - 1 (max.)
Sumida 310(min.) 360(typ.) 410(max.)
Output voltage (Vrms,
no load) Ambit - 600 (typ.) -
Sumida 1600(min.) - -
Output voltage
frequency (kHz) Ambit 40 (min.) - 70 (max.)
Sumida 50(min.) 54(typ.) 58(max.)
Output Current/Lamp Iout(Min) 0mA 0.6mA 1.2mA Vadj=0V
Iout(Max) 5.5mA 6.0mA 6.5mA Vadj=3V
LCD
Item Specification
Vendor & model name IDT I-77C-02 LG LP150X05 AU Optronics
B150PG01
Mechanical Specifications
LCD display area (diagonal, inch) 14.1 15 15
Display technology TFT TFT TFT
Resolution XGA
(1024x768) XGA
(1024x768) SXGA
(1400x1050)
Supports colors 262K 262K 262K
Optical Specification
Brightness control Keyboard hotkey Keyboard hotkey Keyboard hotkey
Contrast control No No No
Electrical Specification
Supply voltage for LCD display (V) 3.3 3.3 3.3