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I am looking for a schematic of the pin-out of the power supply for a ViewSonic VG900 or VG900b monitor. I have a good power supply for the unit but the wrong connector on the end of the cord. Need to replace the connector, a 4 pin unit, but first I need to know which pin is hot and which is not.

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The two spaced furthest from each other are the +, the two closest together opposite the little nipple on the inside of the ground ring are the -.

Posted on Dec 14, 2009

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You will need to call the support staff at viewsonic. Be persistent, they WILL have to do some digging and that can affect thier allowable talk time as call center agents are always under the gun. Also be persistent bnecause alot of agents can be lasy and not want/feel like doing a bit of digging.

Posted on Nov 05, 2008

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Yesterday my comaq evo desktop was working very well and today i power my computer and it could not display i have check the memory and is ok , so what can be the problem?


check the connections are perfect .
1.power
2.cpu to monitor connection
the os may be corrupted in many cases check it.finally graphics card to be checked by the engineer

Sep 03, 2011 | Compaq Evo D510 PC Desktop

1 Answer

1 out 50 times I turn on my Dell Dimension E520 there is no signal to the monitor. I have tried to install a new PCI express card instead of using the integrated graphics but the result was the same e.i no...


The problem is the Power Supply. Weak voltage power rail.

You've taken the right steps with your diagnosis.

1) Start with the monitor cable. If removable use a known to be good monitor cable.
Checks okay, go onto the graphics 'engine' of the computer.

If the monitor cable is not removable, use another monitor, and cable for a test.

2) If you are presently using Integrated Graphics the next step in diagnosing is to install a graphics card.
See if the problem is the Integrated Graphics 'engine'.

[ Just to add:
Intel GM X3100 is the graphics 'engine'. It is integrated into the Northbridge chip of the motherboard chipset.

Intel G965 chipset is the motherboard chipset. The Intel ID number on the Northbridge chip is 82G965.
The Southbridge chip is an Intel ICH8, or ICH8R, or ICH8-DH,

http://en.wikipedia.org/wiki/List_of_intel_chipsets#Core_2_Chipsets

{Chip and Chipset are slang terms for I.C.
Integrated Circuit,

http://en.wikipedia.org/wiki/Intergrated_Circuit }


The Northbridge chip handles the Processor, Ram Memory, and HIGH-speed graphics.
AGP and PCI Express are High-speed graphics.

A graphics card in a PCI slot is not High-speed graphics.

The Southbridge chip handles the slower capabilities of a computer.
PCI and Integrated Graphics being two of the slower capabilities.
SATA, IDE, USB, and Ethernet, are also some of the slower capabilities of a computer,

http://en.wikipedia.org/wiki/File:Motherboard_diagram.svg

CPU = Central Processing Unit. Another name used is Microprocessor, or Processor for short ]

3) Power Supply.
Weak voltage power rail.

The Power Supply has enough power to light LED lights, and maybe spin fans, but Not enough power to turn the Processor on.

A) ALL the LED lights on at once will consume less than 1 Watt of power.

B) EACH fan consumes 2 to 3 Watts of power.

C) A typical Processor can consume (Maximum) 51 to 125 Watts of power.
Depends on what Processor it is.

The Dell Dimension E521 desktop computer's motherboard, has an LGA 775 processor socket.
(Processor has the socket holes, processor socket has the pins)

The Intel processors that can be used in this processor socket, can be an Intel Pentium 4, (Version that uses an LGA 775 processor socket), Intel Pentium D, or Intel Core2 Duo, AND Intel Core 2 Quad, with a maximum FSB of 1066MHz. (If the BIOS version will support Intel Core2 Quad processors)
{Front Side Bus of 1066Megahertz}

Wattage consumption can be as much as 105 Watts.

Do you have a KNOWN to be good, compatible Power Supply available, to use as a test unit?

{Compatible being that the Power Supply case fits, (ATX), has the right amount of power cables, and the correct power cables. (Needs to have a 24-pin ATX main power cable, and a 4-pin ATX +12 Volt power cable, for one)

Perhaps there is an unused computer that has a Power Supply you can borrow.
Maybe someone has upgraded to a better computer, and has an unused one with a compatible power supply for a test unit.

Nov 07, 2010 | Dell Dimension E520 PC Desktop

1 Answer

HELLO SIR, MY NAME IS MD.NIZAMUDDIN.. MY CONTACT NO IS 9000592055...I AM HAVING VIEWSONIC LCD 19INCHES MONITOR...MY PROBLEM IS MY MONITOR IS AUTOMATICALLY SWITCHING OFF & SWITCHING ON WITH A GAP OF...


Sounds like a power problem on Power supply board. It could possibly be damage or overheating. It will have to be replaced or fixed by someone good with LCD's
This is something i wouldn't try to repair by myself.
Hope this helps a little bit. Good luck

Jul 28, 2010 | ViewSonic PC Desktops

2 Answers

Its not reading the monitor


1. check monitor power is on.
2. check signal cable is connected.
3. Check cable for damaged/bent pins.
4. Check that correct interface is selected on the monitor. (VGA, HDMI, DVI etc...)
5. If you have more that one graphics card installed in your system make sure that you try all connectors on all cards as the integrated graphics might be disabled in the bios.
6. If your connecting your monitor to the CPU by a cabe other than a VGA cabe then try using a standard VGA (15 pin cable port is usually blue).
7. try another monitor.
8. Try a bios reset, usually jumpered inside the CPU casing, just make sure that opening it will not void any warranties.

If your still stuck let me know.

Jun 20, 2010 | Sony VAIO VGC-RA840G PC Desktop

1 Answer

Am looking for a manual / schematic for an aopen atx z400 08f 350 watt power supply. I need to be sure of my connections (I'm not sure of at least two outputs) to my non-Aopen motherboard. I just bought...


ATX Motherboards and power supplys are standard the connections are the same however there are now 2 types an 20 pin and a 24 pin varient - the extra 4 pins supply extra power to the power hungrey motherboards needed for morder dual core processors and graphics cards - you can use a 20 pin connector on a 24 pin board but don't overload it with graphics and pwerful proccessor or it will fail, alternatively go toyou local PC hardware store or internet supplier and purchase a new PSU to the same spec as the board - your manual will tell you the minimum spec you should need. - it all depends on the combination of processor memory, grachics other bus cards (audio NIC etc) and how many peripherals (HDD's and CD/DVD/Blue ray you have in the unit if you worried look at the specs for each unit you have in your PC - add the wattage together and then ad at least 25% for overhead if your current PSU is with spec then just carry on - it is not advisable to go around and try and rewire a PSU not for the £20 it costs to replace it

Jul 06, 2009 | AOpen PC Desktops

1 Answer

Monitor will not come on. Power light flashes


Are there any lights on your PC? If not then you are going to have replace you power unit. I would not attempt to repair because a)they are cheap to replace and b)they contain a lethal charge.

Apr 14, 2009 | PC Desktops

2 Answers

Not sure about upgrading power supply


In many cases the additional 4 pin section slides up and off of the main power plug for use in your particular unit.

Feb 20, 2009 | HP COMPAQ Presario SR5410F Pentium...

1 Answer

Viewsonic VX2235 22" Flat panel monitor has been gradually declining with powering up, blinking on for a couple of minutes and then goes black with green power light indicator. Turning power off for...


connect the monitor with another desktop. If if works then problem is with your ram/graphics card or motherboard with inbuilt graphics. If the monitor functions the same way as before have a look at the pins on the connector. Bend/dirty pins can play havoc. If they are ok take the monitor to service centre.

Dec 16, 2008 | ViewSonic PC Desktops

1 Answer

Viewsonic monitor power supply burnt up. where can i buy a new one.


Try computer hardware store, or computer repair center.
For viewsonic specific, try contact (800) 688-6688.
Try the following addresses: http://www.viewsonic.com/support/customer-service/
http://www.viewsonic.com/contact/

Regards, 
dC

Dec 14, 2008 | PC Desktops

2 Answers

Light is solid yellow on front switch, won't boot


if you are certain the power supply is good(try it in another machine) and its completely connected it sounds as if your motherboard is going bad, there is a 5-volt supply in your power supply that does not turn off when the system shuts down, its called 5-volt standby, this runs some small circuits on the motherboard that monitor the power switch, when its pressed the circuit starts up the whole power supply. thats how we can power off the system with software. usually its a custom chip and some components, but without the schematics of the motherboard and the replacement parts and the ability to de-solder and solder on a multi layer board its not usually repairable by the end user.

the system memory and processor are not even used in this part of the system startup, they come into play after the supply is up and stable and supplies the power good line to the motherboard.

make sure the supply is good, and all connections are making contact, that none of the pins have backed out of their housings when being plugged in and that there are no cracks in the solder joints where the power connectors attach to the motherboard.

 

Oct 17, 2007 | PC Desktops

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