Question about ViewSonic VG500b (Black) 15" LCD Monitor

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ViewSonic VG500 wiring configuration?

I have a ViewSonic VG500 but the graphics plug is damaged. What is the wiring configuration so I can solder on a new one??

thanks, tom

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It is pretty difficult to solder on a new DB-15 connector, the easiest way to do it would be to take apart the back of the monitor and de-solder it off the video controller in there. Each contact will be labeled and a replacement DB-15 cable with connector will have the pinout information on it. It is extremely difficult to describe how to do it without seeing the diagrams.

Depending on how bad the plug is damaged you may be able to pull out the broken pins. A lot of the time you can also just straighten out the problematic pins. You really only need about 3 working pins to get a solid video connection. So maybe you don't even need to replace the plug? Not sure of your exact situation, but hopefully this helps!

It may be easier to just get a new monitor, you can get a 15" LCD for about $50 - 60, 17" for about $75 shipped if you look around.



Posted on Jul 12, 2009


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Bad-HP NX9600 graphic card... Replacement recommendations?

Your laptop uses Integrated Graphics.
Another term used for Integrated Graphics is OnBoard Graphics.

ON the motherBOARD.

This means the graphics chipset is soldered directly to the motherboard.
(Via a BGA surface mount)

It is either an ATI Mobility Radeon X300 with 64MB of video memory, or an ATI Mobility Radeon X600 with 128MegaByte of video memory.

As such, replacing the graphics chipset is more feasibly done, by replacing the motherboard.

A) What makes you think the graphics chipset is bad?
You plugged in an external VGA monitor, (Laptop OFF, monitor OFF), and the graphics are distorted on the external VGA monitor?

[ Turn the external VGA monitor on. IF a CRT type, (Looks like a small TV), allow it to warm up.
Turn the laptop on.

If graphics do not show up on the external VGA monitor, press, and hold down on the Fn key, and simultaneously tap on the F4 key.

You may have to perform this procedure more than once, as there are several display options ]

B) Video Cable:
Loose connections of the Video Cable TO the motherboard, and/or TO the back of the LCD screen, can cause a bad display.

B1) A damaged Video Cable can also cause a bad display.
Just from the usual opening, and closing of the laptop, may damage the Video Cable. It runs across the motherboard, and under the left Hinge Cover.

Laptop partially disassembled, look at the Video Cable on the motherboard side, and see if there are obvious signs of damage to the Video Cable's sheath.

There may be damage to the tiny wires inside the cable, also.

The best method is to remove the Video Cable, and with an economical multimeter perform a continuity test of all the wires inside the cable.
(Multimeter set to Ohms)

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

The I.C. for graphics is a graphics chipset, or G.P.U.,

The GPU for your laptop is mounted to the motherboard with a BGA surface mount,

To explain the BGA surface mount, compare to an older Intel Pentium 4 processor, that uses a Socket 478 processor socket.

The bottom of the Processor has contact pins. (478 of 'em)
The processor socket has matching socket holes. (478)

With a BGA surface mount, the chipset has Solder Balls on the bottom.
The motherboard has matching Copper Pads. (Usually coated with a thin gold plating)

The chipset is set into place over the motherboard, with the Solder Balls lining up with the matching Copper Pads.
Heat is then applied at a specific temperature, and length of time.

The Solder Balls melt which solders the chipset to the Copper Pads.
(Which in turn solders the chipset to the motherboard)

The Processor and graphics chipset are the two hardware components, that give of the most heat.
IF, the laptop is kept dirty inside on a constant basis, the graphics chipset will overheat.

Constant overheating may partially melt those solder connections (Joints), and cause a bad contact of the graphics chipset to the motherboard.

To repair?
IF the graphics chipset is bad, you will need to find another one.
(Ummm, good luck)
Then a BGA Rework machine should be used to remove the bad graphics chipset, and solder in a new one.

OR, if the mounting of the graphics chipset is bad, (Solder connections), a BGA Rework Machine can resolder the connections.

This is why I state it is more economical, and feasible, to just replace the motherboard.

[ Laptops that DO indeed have a dedicated removable graphics card, base it off of the MXM technology,

Laptop manufacturers use the term 'Graphics Card' too loosely.
They state it, to make the consumer believe the laptop has a removable graphics card, when it doesn't.

Better for sales, and also helps the consumer understand about their laptop's graphics devices; but is used wrong.

They are stating Graphics Card, when it is really just a graphics chipset, soldered to the motherboard.

Kind of like people referring to a computer as a CPU.
It isn't.
CPU = Central Processing Unit. Another term used is Microprocessor, or simply Processor for short.
The 'Brain' of the computer ]

For additional questions please post in a Comment.


[ Service Manual,

Scroll down to the bold heading - Service and maintenance information
Click on the file listed underneath -

Compaq Presario X6000 and HP Compaq NX9600 Notebook PC - Maintenance and Service Guide

This is a PDF file. The computer you are using now has Adobe Reader on it, which uses PDF files.
After you click on the file name it may take up to 30 seconds, before the first page comes up.

This is a temporary download. You can save a copy to your computer, and not have to download again.
This way you can burn it off to CD disk, and have the manual at your fingertips anytime you want.

You can also check the file out first to see that it works OK, then delete it from the computer you downloaded it on, and save harddrive space.
If you do not know how, and wish to, post in a Comment ]

Feb 05, 2012 | HP Compaq nx9600 Notebook

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Please just press and hold the power button for at least 15 seconds. After doing that then it will not do anything, I would suggest to plug the power cable to your viewsonic then plug the powercable to the powersource, then press and hold the power button for 10 seconds.

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Sorry, but i think the solder wouldn't help here. This could be the result of physical damage- kick, dropped down or smth similar. Usually there breaks the decoding matrix crystals, that are very thin, and there are 4- 8 crystal chips for the matrix. This problem solves by changing the LCD, but it costs almost as the whole screen (around 150USD or 100EUR), depends of model.

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I got a no signal sign. I had a tech come and check the tower and blew all dust out. Plugged cable back in and now I get a red, green and yellow screen

Power down your PC and then try pulling out your video Card. Then put it back in. It is called re-seating. Sometimes they become loose when they get moved or jarred in anyway. If you have a mother board graphics controller only, then there may be damage to the mother board. You may want to purchase a PCI or VGA graphic card.

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there are many cause for it 1/vj has gone change it to check it.2/ wp/vista progrram is damage repair it 3/ ram may be damage change it to check it. mother bord may be damage change it to check,prosser may be damage change it check. last u may change high graphic- press f8 then u can correct require graphic....thanks

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Monitor stays bright white.

The first thing you always investigate is what changed when the behavior began showing symptoms. Maybe something was jostled or moved or the humidity was particularly high or something but that should give you some indicators. If nothing comes to mind then try moving all electronic interference from the equation. Speakers, fluorescent lights, cable modems, etc. can all have an impact so move your monitor and monitor cables away from these things.

No luck yet? Chances are high that there is an issue with a solder joint on the power input circuit board of the monitor. First though, try a confirmed working plug since sometimes the video input plug is simply going bad. If that tells you the plug is okay then try a different monitor and see if the display problems still exist or not. If not then it's got to be the monitor and the solder connection is likely the culprit. Check your warranty and/or see a service technician to have it fixed.

If the problem persists then it could still be the connections on the video cord. There's some sort of filter/booster that people use but I don't know much about that, it might be worth looking into though.

Otherwise you need to open up the case and try a different graphics board. If you don't have an extra PCI graphics card then I would at least inspect the graphics card for damage like erupted capacitors or corroded/cracked solder spots. You'll have to look directly on the motherboard if you have onboard graphics.

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Problem with viewsonic VPW450HD 42' plasma T.V

Hello All,
I have a VPW450HD set that I just fixed. I get the feeling that they are not all the same inside, but this may be the same problem many of you are having. When turned on the green light on the front of the set would come on, if in a dark room I could see that there was some light to the screen ( not much ) but no picture and no sound. When I pushed the power button to turn the set off - it would not turn off. I had to turn it off from the main power switch on the back.

If you take the back off you will see a large square board in the center of the TV ( about 12" X 10" ). I would describe this as the main power supply board. Near the top there is a two wire connector with a Red & Black wire in it. Follow this wire up to the next board. It is a smaller board ( about 5" X 3" ) with the Red & Black wire connector near the top right corner. I would describe this board as a secondary power supply board. It sends the power down to the input board. On the secondary power supply board there is a six connector plug on the left side of the board. This is where I found the problem with mine. The connector is burnt and melted because of a " cold solder " joint. Carefully remove the secondary power supply board - you may be able to use the same connector if it is not to burnt and brittle. The six pins on the solder side of the board need to be re-soldered. These pins are thicker material than the other solders, and so do not solder well in a wave solder process. the pins do not get hot enough to solder properly, so over time an opening is created between the pin and the board.
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I hope this helps some or all of you !
Let me know if it worked for you or if you have questions.
Good Luck,
- Andrew

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