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24 Chapter 1
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-DC Converter Output
Output Rating 5V 3.3V 12V 5V SB
Current (w/load, A) 0~4.5 0~3.5 0~0.12 0~0.02
Charger Output
Normal charge (charge while system
is not operative)
2.5A
Background charge (charge even
system is still operative)
1A
Battery-low 2 level (V) 13.5V
Battery-low 3 level (V) None
Protection
Charger protection Over Current Protection
DC/DC converter protection OCP (Over Current Protection, A)
OVP (Over Voltage Protection, V)
UVP (Under Voltage Protection, V)
DC-AC LCD Inverter
Item Specification
Vendor & model name Ambit
Input voltage (V) 8 ~ 21V
Input current (mA) 1A (max.)
Output voltage
(Vrms, no load)
1400Vrms
Output voltage
frequency (kHz)
40 ~ 70KHz
Output Current/Lamp 5.5 mA ~ 6.5mA
LCD
Item Specification
Vendor & model name 12.1” Hitachi
TX31D35VC1CAA
13.3” ADT
L133X2-3
14.1” ADT
L141X1-1
14.1” IBM
ITXG76C
Mechanical Specifications
LCD display area (diagonal, inch) 12.1 13.3 14.1 14.1
Display technology TFT TFT TFT TFT
Resolution SVGA (800x600) XGA (1024x768) XGA (1024x768) XGA (1024x768)
Support colors 16M 262K 262K 16M
Optical Specification
Brightness control Keyboard hot key keyboard hotkey Keyboard hotkey Keyboard hot key
Contrast control None None None None
Electrical Specification
Supply voltage for LCD display (V) 3.3 (typ.) 3.3 (typ.) 3.3 (typ.) 3.3 (typ.)
DC-DC/Charger Converter
Item Specification