Acer 390 Series, Service Manual

Page: 33 / 204

System Introduction 1-21
1.4.23 DC-AC Inverter
DC-AC inverter is used to generate very high AC voltage, then supply to LCD CCFT backlight use,
and is also responsible for the control of LCD brightness. Avoid touching the DC-AC inverter area
while the system unit is turned on.
Table 1-27 DC-AC Inverter Specifications
Item Specification
Vendor & model name Ambit T62.071.C.00
Input voltage (V) 6.8(in.) - 22(max.)
Input current (mA) - - 750 (max.)
Output voltage (Vrms, no load) 1000 (min.) - 1600 (max.)
Output voltage frequency (kHz) 40 (min.) - 65 (max.)
Output current (mArms) 1.0~5.5 (min.) 1.5~6.1 (typ.) 2.0~6.7 (max.)
1.4.24 LCD
Table 1-28 LCD Specifications
Item Specification
Vendor & model name HITACHI
LMG9980ZWCC-01 TORiSAN
LM-JK53-22NFR-A HITACHI
TX31D21VC
Mechanical Specifications
LCD display area
(diagonal, inch) 12.1 12.1 12.1
Display technology STN STN TFT
Resolution SVGA (800x600) VGA (800x600) SVGA (800x600)
Supported colors -- -- 262,144 colors
Optical Specification
Contrast ratio 35 (typ.) 40 (typ.) 80 (typ.)
Brightness (cd/m
2
)
70 (typ.) 70 (typ.) 70 (typ.)
Brightness control keyboard hotkey keyboard hotkey keyboard hotkey
Contrast control using keyboard
hotkey using keyboard
hotkey none
Electrical Specification
Supply voltage for LCD
display (V) 3.3 or 5 (typ.) 3.3 or 5 (typ.) 3.0 ~ 3.6 (typ.)
Supply voltage for LCD
backlight (Vrms) 650 (typ.) 630 (typ.) 595(typ.), 660(max)