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1.
Caution :
No modification of any circuit should be attempted . Service work should only be performed after you are
thoroughly familiar with all of the following safety checks and servicing guide line
2.
Safety Check :
Care should be taken while servicing this LCD display, due to the high voltage used in the inverter circuit.
High voltage is exposed in such areas as the associated transformer circuits .
3.
POWER SUPPLY REQUIREMENTS
The external power converter for this display utilizes AC and DC cords. The AC cord is detachable , but the
DC cord is permanently attached . Any attempt to replace another adapter could result in damage to the display .
4.
LEAKAGE CURRENT HOT CHECK
4-1 Plug the AC cord directly into the AC outlet. Do not use an isolation transformer during this check.
4-2 Connect a 1500 ohm , 10 watt resistor , paralleled with a 0.15uF capacitor between each metallic part
and a good earth ground
4-3 Use an AC voltmeter with 1000 ohm / volt or more sensitivity and measure the AC voltage across the
combination 1500 ohm resistor and 0.15uF capacitor.
4-4 Move the resistor connection to each exposed metallic part and measure the voltage.
4-5 Reverse the polarity of the AC plug in the AC outlet and repeat the above measurement.
4-6 Voltage measured must not exceed 1.5 volt RMS, from any exposed metallic part to the ground. A leakage
current tester may be used in the above hot check, in which case any circuit measured must not exceed 1.0
milliamp. In the case of a measurement exceeding the 1.0 milliamp value, a rework is required to eliminate the
chance of a shock hazard .
To Metal Parts
V
AC VOLTMETER
1500
10W
0.15u
.
Earth Ground
1. Precautions and Safety Notices
1
ViewSonic
Corporation
Co
nfidential
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Do
Not
Copy
VX750
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...