Vx2025Wm - ViewSonic VX2025wm-1 Service Manual

6.2 Audio Amplifier UTC TDA7496L (U9)
The TDA7496L is a stereo 2W+2W class AB power amplifier; Features of the TDA7496L include linear
volume control, Stand-by and mute functions.
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.
INPUT Rated Input Voltage
Input Voltage Range
Input Current
Off state Input Power
On / off control Voltage
OUTPUT Rated Output Strike-on Voltage
Rated Output Voltage
Rated Output Frequency
Rated Output Current
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.
INPUT
OUTPUT
ViewSonic Corporation
Rated Input Voltage
Operation Input Voltage
Input Current
Inrush Current
Output Voltage Regulation
Output Ripple and Noise
Rated Output Current
Turn-on Delay
20Vdc
18.5~21.5Vdc
<2A
<0.1W
2~5.25 for on, 0~0.2 for off
1500~2000Vrms
710Vrms at 6mA
40~50KHz
6~7mA
90~264Vac, 47~63Hz
100~240Vac, 50~60Hz
<1.5A@90Vac
<80A @ 230Vac(Cold start)
+/-5%
300 mVp-p
<4.16A
<3 seconds
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VX2025wm-1