Service manual

ViewSonic Corporation Confidential - Do Not Copy VA2012w-2_VA2012wb-2
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6.3 Inverter Board
This is a specific inverter for VA2012 monitor 40W backlight which converters 20Vdc to drive 6 tubes cold cathode
fluorescent tubes. Electrical specification described as below.
6.3.1 Inverter Electrical specification described as below.
Rated Input Voltage 20Vdc
Input Voltage Range 18.5~21.5Vdc
Input Current <2A
Off state Input Power <0.1W
INPUT
On / off control Voltage 2~5.25 for on, 0~0.2 for off
Rated Output Strike-on Voltage 1500~2000Vrms
Rated Output Voltage 710Vrms at 6mA
Rated Output Frequency 40~50KHz
OUTPUT
Rated Output Current 6~7mA
6.4 This is a general purpose AC / DC adapter which converter 90~240 Vac to a stabilized DC voltage 20V for inverter and
12V for system board with rated output current of 4.16A
6.4.1 Power Electrical specification described as below.
Rated Input Voltage 90~264Vac, 47~63Hz
Operation Input Voltage 100~240Vac, 50~60Hz
Input Current <1.5A@90Vac
INPUT
Inrush Current <80A @ 230Vac(Cold start)
Output Voltage Regulation +/-5%
Output Ripple and Noise 300 mVp-p
Rated Output Current <4.16A
OUTPUT
Turn-on Delay <3 seconds