Question about ViewSonic VX900 19" LCD Monitor

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I have a vx900 internal power supply. Wont power on at all so I checked the caps, seems good, I tested the power supply, 11 volts out of the unit but 2.5 volts when it is reinstalled. What do I need to do the the power supply to fix it?

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Bud Martin

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There are two version of this monitor, one has built-in power supply, another one uses 12vdc adapter.
Adapter:
http://lcdpayless.com/productpage.php?productId=4629

The adapter is REGULATED 12vdc 6a power supply that can handle the load up to 6a, if when is has load on it and the voltage drops down to 2.5vdc, teh it is that the power supply is bad or you have shorted circuits in the monitor. You can test the power supply using 12v car lamp such as #1157 bulb to test your power supply under load.
Caps in the power supply do go bad as you can see in my pictures here:
http://s807.photobucket.com/albums/yy352/budm/Bad%20capacitors/?action=view&current=badcaps2.jpg

Posted on Mar 10, 2011

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How to repair a 10 times blinking problem with my sony bravia kdl46v5500


In my experience, the majority of modern TV failures is caused by cheap electrolytic capacitors in the power supply.
When the supply goes flaky, it may cause all kinds of seemingly unrelated problem codes.
Two days ago, I finally got tired of turning on my set 10-12 times before it stayed on.
!0 minutes of disassembly, another 30 minutes to find caps close enough to the original value (actually, only half- 470uF10V to replace 1000uF/10V) and the addition of some high quality multilayer parallel caps of only .47uF (under the board) to the replacement caps to protect the electrolytic caps from exposure to high frequencies present in switch-mode power supplies.

The chemical in electrolytic capacitors breaks down when fast rise time signals are present causing the values to degrade to near-nothing.
The two caps removed from our 3-y/o set measured 4.1 & 3.7 uFd instead of the 1000 they were supposed to have.
This allows high frequency ripple to travel all through the circuitry causing unpredictable misbehavior of digital circuits.

These failed caps are often easy to spot since one sign of their internal problems is gas buildup internally causing their aluminum cans to create domes or catastrophic failure of the scored tops, splitting the case open to relieve gas pressure.

Check the power supply section for capacitors that appear swollen-

Good luck-

Oct 14, 2014 | Sony BRAVIA KDL-46V5500 FULL HD...

1 Answer

IBM wheelwriter 10 series ii 6783-001


try to figure out any short circuit that causing power supply to come in safe mode , just give me more details about power supply , what kind of power supply is it?

Apr 13, 2014 | Office Equipment & Supplies

1 Answer

When I push the power on button.I've taken It apart and tested the power supply board,240volts AC Is going In at the edge connector but the DC out connector shows no dc volts coming out.


Check all fusible links (such as 0 ohm resistors) and the voltage regulator as well as the rectifier.
You may also have a shorted capacitor, check all electrolytic caps.

Feb 23, 2011 | ViewSonic VX900 19" LCD Monitor

2 Answers

Wat is the exact power supply for lcd monitor ?


Here is the Power configuration of your monitor
cmptrlink_5.jpg

For more information, visit this site
http://reviews.cnet.com/lcd-monitors/vx900-19-inch-multimedia/4507-3174_7-9691598.html
Good Luck, Do rate the solution if got help

Dec 04, 2010 | ViewSonic VX900 19" LCD Monitor

1 Answer

During a recent storm our power went out and a family member was on our Gateway 504GR. Since the power came back on, the computer will not turn on. It was plugged into a surge protector and all other items...


Suggest the Power Supply took a 'hit' from the storm. Hopefully this is all that received the power surge.

Surge protectors are a necessary item, but in reality it takes an Expensive surge protector, for defense against a lightning storm, and even that isn't a sure bet.
(Lightning strikes can produce over a Million volts)

Also, I have had three surge protectors where just THAT receptacle was bad.

"Hmmmm, surge protector power on LED is lit. Printer has power, monitor has power, and router has power. Surge protector must be good."

NOT.
Just THE receptacle the computer was plugged into was bad.

Past this test, I would suggest diagnosing the Power Supply.

A) Test the Power Supply voltages

B) Use a KNOWN to be Good, Compatible power supply, for a test unit.

C) Buy a power supply, and replace it.
Granted, not a professional approach, and could result in a waste of money.
Some do approach repair in this manner, however.

Going backwards.

C) The Gateway 504GR desktop computer uses an ATX style of power supply, and is rated at a maximum Wattage rating of 300 Watts.

(ATX case is approximately 6 inches Long, 6 inches Wide, and 3-1/2 inches Tall)

Gateway Support > 504GR desktop computer > Support Documents main page,

http://support.gateway.com/s/PC/R/3724/4365nv.shtml

If you Left-click on - Components, you will see a list of components used in the 504GR.
Scroll down to the heading - Power Supplies

Left-click on the blue -
102015 - 300 Watt Power Supply, heading.

It's just a generic ATX power supply with a,

1) 24-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

2) 4-pin ATX +12 Volt power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

[ Power for the Intel Pentium 4 processor. Plugs into the motherboard ]

3) (1) SATA power cable

http://www.playtool.com/pages/psuconnectors/connectors.html#sata

[Power for the SATA harddrive ]

4) At least two 4-pin Peripheral power cables,

http://www.playtool.com/pages/psuconnectors/connectors.html#peripheral

[Power for the CD drive, and the DVD drive ]

This is just one example of a decent, reliable, economical Power Supply, that will fit the bill,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1389575&CatId=1078

B) The above explains the minimum Wattage needed for the test unit, the size, and shape of the case, and the needed power cables, in case there is a power supply around to use for a test unit.

(Some have an older unused computer sitting in a closet, or what have you. The computer can be temporarily cannibalized for the power supply)

1) That SMPS (Switched-Mode Power Supply) puts out three DC voltages.

A) 3.3 Volts
B) 5 Volts
C) 12 Volts

(Two C cell flashlight batteries produce 3 Volts DC)

The test is done for the 12 Volt power rail.
ALL Yellow wires in the various power cables, are 12 Volt wires.
They all go back to one 12 Volt power rail inside the Power Supply.

[Orange insulated wires are 3.3 Volts.
Red wires are 5 Volts ]

11 to 13 Volts indicates a good Power Supply.
Less than 11 Volts means it's time to replace.

You can use a multimeter to check the 12 Volt power rail, or a power supply tester.
One example of a power supply tester,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=5250576&CatId=5471

An economical multimeter good enough for this test, can be purchased from $5 to $12.

The Power Supply is unplugged from power.
The Positive (Red) probe lead of the multimeter, is connected to ANY Yellow wire.

The Negative (Black) probe lead is connected to ANY Black wire.

(ALL Black wires are Ground wires. They all go back to one central Ground source inside the PSU.

{Power Supply Unit. Another term for Power Supply. Also another term for the SMPS, used in personal computers)

To reply just Left-click on Comment. (Believe upper right of your page )

Jun 20, 2010 | Computers & Internet

1 Answer

My computer wont boot up the power light comes on,the speakers come on but the keyboard doesnt come on and nothing to the monitor...oh by the way its an emachines w3506


If the keyboard doesn't briefly light up the Caps Lock, and Numlock keys, when first starting the computer, and there's no video signal to the monitor, (No Signal), the computer isn't working.

Suspect the Power Supply first.

Bad Power Supply, is one of the most leading causes of computer failure.

This is brought about usually by one of two things, or a combination of both.

1) eMachines are Budget line of computers. Cheap quality parts are used, to defray the cost of making the computer.
One of the cheap hardware components is the Power Supply.

2) Computer is dirty inside, as well as the Power Supply.
The hardware components inside a computer, as well as the Power Supply, are cooled by air from fans.

Dirt, dust, etc, cause the cooling capacity of the cooling system, to drop tremendously.
Heat = Wasted Energy.

The Power Supply tries to keep up with the call for power, cannot, and components inside the Power Supply fail.

The Power Supply has a weak voltage power rail.
It may seem that the computer is receiving power, but it isn't receiving enough.

A) ALL the lights use less than 1 Watt of power

B) EACH fan uses 2 to 3 Watts of power

C) A typical Processor uses anywhere from 51 watts to 125 Watts.
Depends on what Processor it is.

The W3506 comes with an Intel Celeron D 352
(Single core processor, that operates at a maximum frequency rate of 3.20GigaHertz. 3.2GHz)

eMachines Support>Specifications>W3506,

http://www.emachines.com/support/product_support.html?cat=Desktops&subcat=W%20Series&model=W3506

Information on the Intel Celeron D 352 processor,

http://en.wikipedia.org/wiki/List_of_Intel_Celeron_microprocessors#.22Cedar_Mill-512.22_.2865_nm.29

The Intel Celeron D 352 can use up to 86 Watts, when operating at maximum capability.

This is why it may seem as though the computer is working, but in actuality it isn't.
The Processor isn't running.

No Processor operating, no computer.
No computer, No Signal to the monitor.
No Processor running, there is nothing to make the Operating System work. (Windows XP is one example of an O/S)

No Operating System working, the keyboard isn't going to 'light up'.

From here the diagnoses should be to test the Power Supply, or replace it with a KNOWN to be good, compatible power supply for a test.

[Compatible being the Power Supply has enough Wattage, the correct power cables, and enough of the correct power cables]

The Power Supply can be tested in the computer, with all the power cables disconnected.
Use a multimeter, or a power supply tester.

Example of an economical Power Supply Tester,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=5250576&CatId=5471

This gives information on the various power cables used, in a personal computer,

http://www.playtool.com/pages/psuconnectors/connectors.html

Using the multimeter, the Positive (Red) probe is connected to the power wire to be tested, then the Negative (Black) probe is touched to a Ground wire.

There are three main voltages, given out by a personal computer power supply, (All are DC volts),

1) The 3.3 Volt power rail.
Wires that have Orange insulation are 3.3 Volt wires

2) 5 Volt power rail. Red insulated wires
3) 12 Volt power rail. Yellow insulated wires

For 12 Volt power, 11 to 13 Volts is okay. Below 11 Volts it's time for a new power supply.

4) ANY Black wire is a Ground wire.

Questions? Post in a Comment.

May 19, 2010 | E-Machines eMachines Desktop PC

1 Answer

Have an old view sonic vx900 (~5yrs old). When you


Check the fuse on the inverter board and also verify it does have have 12vdc feeding the fuse. Worst case will be the lamps, power supply caps look OK?

Jan 18, 2010 | ViewSonic VX900 19" LCD Monitor

1 Answer

My ViewSonic VX900 won't turn on. I have had it since late 2003 and it has operated flawlessly. Went to turn it on; nothing. No light, no standby light. Checked the power cord against another monitor and...


Hello,

The VX900 has 2 different version of the unit. One version has an external power supply and the other has internal power supply. Since you said you changed the power cord I would guess you have the internal power supply version. The issue you have is caused by the capacitors on the power supply board have overheated and blown out. This is a common problem on many LCD monitors after a few years of use. If you open the back of your monitor and look at the supply board you should see the bulging capacitors. Check our web page at: www.ccl-la.com for Pictures and examples of what to look for and what you need to get to do the repair. If you have any questions let us know on our web site and we will be glad to help you get going again.

I hope this helps, If so please rate our solution.

Buddy
Corporate Computer
www.ccl-la.com

Jan 12, 2010 | ViewSonic VX900 19" LCD Monitor

1 Answer

MY POWER SUPPLY STOP WORKING


300mA is marginal. On CD start unit draws a little over 400mA for about 1/2 second. At moderate CD audio levels the unit draws right at 300 and at full volume 400mA.
Be certain of the polarity and voltage . On the unit I have the wire with the white stripe is negative. If you are using a non-regulated supply, the voltage could be higher than rated. I am using a 9.5 volt non-regulated supply and after input filtering I have 11.5 volts across the input cap, that is rated @16VDC
A non-regulated 12VDC supply will probably exceed this 16VDC
rating.

Measurements taken with Fluke 23 and Simpson 160

Jul 30, 2009 | Sony ICF-CD855VSIL Clock Radio

1 Answer

VX900


Hi
Even though you show 12 volts, you could still be coming up short in amps on your powerboard.
Updating the capacitors (all of them except for possibly the main) may correct this.
If that doesn't do it, then the inverter is the next target to check.
Fran

Jun 15, 2008 | ViewSonic VX900 19" LCD Monitor

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