6.2 Audio Amplifier TPA3002D2 (U7)
The TPA3002D2 is a 9-W per channel efficient, Class-D audio amplifier for driving bridged-tied stereo speakers.
TPA3002D2 can directly drive 8 ohms speaker, does not require output coupling capacitor, bootstrap capacitor,
or LC filter. Audio line-in is fed into pin 2,6 of the TPA3002D2. The output gain is controlled by pin 11. It also
provides line outputs for external headphone with a range of gain control from –56dB to 20dB.
6.3 Earphone Amplifier LM4881 (U8)
The LM4881 is a dual audio power amplifier for earphone application. It provides high quality output power
(THD at 1 KHz at 75mW continuous average output power into 32ohm load) with a minimal amount of external
components. It features thermal shutdown protection circuit and no bootstrap capacitors or snubber circuits are
20
ViewSonic
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nfidential
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Do
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VX750
necessary.
6.4 Inverter Board
This is a specific inverter for VX750 monitor backlight which converts 12Vdc to drive four cold cathode
fluorescence tubes. Electrical specification described as below.
Rated Input Voltage
12Vdc
Input Voltage Range
11.4~12.6Vdc
Input Current
<1.96A
Off state Input Power
<0.1W
INPUT
On / off control Voltage
2~5.25 for on, 0~0.13 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
6.5 Adapter
This is a general purpose AC / DC adapter which converts 90~240 Vac to a stabilized DC voltage 12 V with rated
output current of 4.16A. Electrical specification described as below.
Rated Input Voltage
90~264Vac, 47~63Hz
Operation Input Voltage
100~240Vac, 50~60Hz
Input Current
<1.5A
Inrush Current
<50A @ 120Vac(Cold start)
INPUT
Standby Input Voltage
12Vdc
Output Voltage Regulation
+/-5%
Output Ripple and Noise
120 mVp-p
Rated Output Current
<4.16A
OUTPUT
Turn-on Delay
<3 seconds
Содержание VX750 VLCDS27089-1W
Страница 34: ...1 3 2 Select the model name of Option Page 31 ViewSonic Corporation Confidential Do Not Copy VX750...
Страница 37: ...2 3 LM5ISP DDC Update 2 3 1 Run the LM5ISP exe Program 34 ViewSonic Corporation Confidential Do Not Copy VX750...
Страница 38: ...2 3 2 Select the model name of Option Page 35 ViewSonic Corporation Confidential Do Not Copy VX750...
Страница 39: ...2 3 3 Read DDC data from Monitor 36 ViewSonic Corporation Confidential Do Not Copy VX750...
Страница 42: ...2 Display color abnormal 39 ViewSonic Corporation Confidential Do Not Copy VX750...
Страница 43: ...3 Monitor can not power on 40 ViewSonic Corporation Confidential Do Not Copy VX750...
Страница 44: ...4 Monitor white screen 41 ViewSonic Corporation Confidential Do Not Copy VX750...
Страница 45: ...5 Monitor black screen 42 ViewSonic Corporation Confidential Do Not Copy VX750...
Страница 46: ...6 Audio noise 43 ViewSonic Corporation Confidential Do Not Copy VX750...
Страница 47: ...7 Analog input always shows NO SIGNAL 44 ViewSonic Corporation Confidential Do Not Copy VX750...
Страница 48: ...8 Digital input always shows NO SIGNAL 45 ViewSonic Corporation Confidential Do Not Copy VX750...
Страница 54: ...8 Exploded Diagram And Spare Parts List 51 ViewSonic Corporation Confidential Do Not Copy VX750...
Страница 67: ...11 PCB Layout Diagrams Main Board 64 ViewSonic Corporation Confidential Do Not Copy VX750...
Страница 68: ...65 ViewSonic Corporation Confidential Do Not Copy VX750 Main Board...
Страница 69: ...66 ViewSonic Corporation Confidential Do Not Copy VX750 Main Board...
Страница 70: ...Main Board 67 ViewSonic Corporation Confidential Do Not Copy VX750...
Страница 71: ...68 ViewSonic Corporation Confidential Do Not Copy VX750 Main Board...
Страница 72: ...69 ViewSonic Corporation Confidential Do Not Copy VX750 Control Board...