Question about Gateway 19" Flat Panel LCD Monitor

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Fpd1960uk works for short time then goes off

I read somewhere on internet many problems down to bad electrolytic capacitors in power supply I replaced these and it worked for a couple of days fine then it stopped again now light comes up blue then after a few seconds it goes out

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If you can change some of the SMD capacitors especially the very light sandy coloured ones as they have a reputation for being very fragile as well no matter what size the package they come in. Hope this helps.

Posted on Sep 28, 2008

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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

Vizio vbr334 bluray player quit working


I had this problem and found a problem with the power supply. The 100 uF, 400 volt electrolytic capacitor was bad. I replaced it and everything works fine.

Aug 14, 2012 | Vizio VBR334 3D BluRay Disc Player 1080p...

1 Answer

Hp monitor wont turn on.


Hello,

First, remove the power cord from the wall, insert it into another outlet. Also, change the power cord, in case it is bad. Sometimes a bad power cord may not pass current into the monitor. But if problem persist, then it means the monitor is having a power problem.

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The monitor is receiving current but cannot circulate or transfer the current to other necessary part of the monitor because of the defective power supply board. You might be lucky it's just a blow fuse. Also a defective transformer can cause your monitor not to power on.

All these can be checked on the power supply board.

But more often bad capacitors causes problem on the power supply board. I do not think the power board needs replacement, rather those defective capacitors is causing this issue. Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board to save you some stress.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about monitor repairers, take the monitor to the nearest repairman to fix the fault for you. Also, note that monitor stores a lot of current, so wait a while before opening the monitor back cover.

I hope this helps.

Regards.

Sep 13, 2011 | HP Pavilion F1703 17" LCD Monitor

1 Answer

My lg w2043 won't power on


Hello,

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board. You might be lucky it's just a blow fuse. Also a defective transformer can cause your TV not to power on.

All these can be checked on the power supply board.

But more often bad capacitors causes problem on the power supply board. I do not think the power board needs replacement, rather those defective capacitors is causing this issue. Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board to save you some stress.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

I hope this helps....

Regards.

Apr 23, 2011 | LG W2042TQ-BF 20 inch Monitor

2 Answers

When trying to turn the unit on, the green power light flashes on and off, there's no picture. After several times of pressing and re-pressing the switch, and holding it down for varying amounts of time, I...


Do as Louie suggested and then look for bad caps first: http://s807.photobucket.com/albums/yy352/budm/Viewsonic%20VX924/

If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed VIEWSONIC monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Aug 25, 2010 | ViewSonic Computer Monitors

2 Answers

No picture


Most common failure in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, falied inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what goes wrong: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further.

Mar 30, 2010 | Computer Monitors

1 Answer

Sometimes works perfectly other times wont even come on model lcd w9za


ronniecam, Likely it's just one bad thermally intermittant solder connection on units internal "switch-mode-power-supply/ inverter supply printed circuit board or bad swollen/leaky electrolytic filter capacitors. Do some reading in my and other LCD technician's fixya profiles for more info on this very common problem. 12fixlouie

Mar 16, 2010 | Fujitsu Siemens Premium Line P19-1 19" LCD...

1 Answer

The screen goes all white within 1 to 5 mins. of being turned on. kinda like my ex-girlfriend.


Inside this monitor is a power supply. The power supply converts the AC electricity you have, (120 volts or 220 volts. Depends on what country you're in), to the needed voltage for the monitor.

The power supply is going bad. This is why you can turn it off and back on, and it works for a few minutes.

More than likely it's Electrolytic Capacitors that are going bad, within the power supply itself.
These capacitors break down due to a variety of problems. The largest issue, is that they are cheap components, and have an inherent problem before they were installed.

Capacitor Plague.
Let me explain. A number of years ago a certain individual stole an Electrolytic Capacitor paste formula.

[To simplify the construction of an Electrolytic Capacitor, let me state they are small aluminum 'cans', and have Electrolytic paste inside. (Ones used for computer related capacitors)

For a more detailed explanation of Electrolytic Capacitor construction, I invite you to go to Wikipedia.org, and type -> Electrolytic Capacitor <- in their search bar. Look under the Construction heading]

Unknown to the thief they were given a bogus formula. This formula of Electrolytic paste developed a gas after time. (Hydrogen gas)

This gas expands in the capacitor, breaks a seal, and Electrolytic paste starts oozing out.
For a small amount of paste loss, the capacitor operates in a weakened state.
Such as what you're experiencing.
After so much paste loss, the capacitor fails.

There is more than one capacitor that is used, in that monitor power supply. Some are still good enough to get the monitor to power on, but can't sustain power, so they can't keep the monitor on.

I know this may be way more information than you wanted, or needed, but I thought I would explain exactly what is going on.

Solution? I suggest you replace the monitor. Opening a monitor is VERY dangerous. I Do Not advise trying to fix it.

Apr 15, 2009 | Mag Innovision LT765b 17" Flat Panel LCD...

4 Answers

Monitor Powers off after a second or two.........


Sounds like an inverter problem. If the power supply is internal replace the capacitors coming out of the voltage regulators. These are usually 1000mf and/or 470mf. If that doesn't do the trick look up the numbers on the 8-pin chips that drive the secondary transformers on the inverter to see if they are getting the right voltages.
Good Luck!

Feb 17, 2008 | Sceptre X5G-Komodo IV 15" Flat Panel LCD...

2 Answers

F-17 neovo monitor stopped working. power light is flashing yellow


The flashing light indicates a diagnostic state called protection.
When the Monitor goes on protection there are only two possible causes.

1 The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or a broken contact, identified an internal fault and kicked in , starting the flashing light.


If you are in situation one, then the monitor will reset just unplugging power cord for one or two hours, sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

Common faults that can occurr suddenly are a blown capacitor on power board, the inverter board powering up backlight lamp has blown, or a fault on main lcd controller board.
check also the video cable, if the cable is shorting, or the connector is bad, you can get same flashing state because of the video cable.

Check connectors, try moving the video cable, and if the cable is not built in, then also try a replacement cable.
Regards

Jan 03, 2008 | Neovo AG 17" LCD Monitor

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