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How do you get the case open to check power supply caps

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Send me email for the service manuals:

Basic LCD monitor troubleshooting guide:

Failed TV and Monitors:
Capacitors kit: he can make you a set of caps for you.
Please post back what you find.

Posted on Oct 02, 2010

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I have a LG204WT with a dying power supply, how do i fix it?

There are some capacitors in the power supply that may have gone bad. You will have to take the monitor case apart to get to the power supply. Start with a small flat blade screwdriver at the bottom of the case and pry gently to get the case open. Be careful of any wiring attached to the front bezel. Once you have it taken apart, inspect the caps on the power supply. Check if any are leaking/bulging, if so...that is probably the culprit.
You can purchase a repair kit from lcdalternatives.
The site also has a installation tutorial on replacing the capacitors.

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I have a Sony VAIO VGC-RB43 desktop with a Bestec ATX-300-12EB3-Rev.S3 power supply. The computer will not power up. The fans will not come on. Measuring DC volts on pin 9 (purple) of the mother board ATX...

Open the power supply case (be careful due to high voltages within the power supply) and look for swollen (tops are domed) or burst capacitors (tops have cracked open due to excessive swelling and the electrolitic fluid has leaked out). We have found this to be a regular problem for systems that have been running constantly for a long period of time. Also, look at the power caps on your mainboard (big ones nearest the CPU) and check for swelling or bursting. I just had tis issue with a Sony Vaio in that the caps in the power supply had started to swell. The system continually rebooted. Have seen the caps on MB's burst as well.

Jun 23, 2010 | Sony Computers & Internet

1 Answer

HP1740 does not react anymore on switching on. Is there a way to open the monitor to check connections? Is there a fuse that could be dead?

It will more likely to be bad caps with bulging top in the power supply section, that is the first place to look, just open the case up using thin flat blade screw driver starting at the bottom edgs of the case, just make sure to remove all the screws and the base first. See example of failed monitors due to bad caps:
Post back what you see so we can guide you further.

Mar 04, 2010 | Computers & Internet

1 Answer

Dell e228wfp LCD with no power.

You need to check the voltages first, on the electrolytic caps in thepower supply section with voltage rating from 10~16vdc should have 5vdc on the two legs of the cap, this 5vdc is used for the logic board. The other caps with voltage rating of 25~35vdc should have about 12~18vdc on it's two legs. That is the starting point, these DC voltages are in the secondary side of the power supply, be careful on the HOTside of the power supply, it has high voltage about 160vdc and 120vac which can kill you, so be careful. If you can post pictures, it will help. See example of my pictures here:

Jan 24, 2010 | Dell E228WFP LCD Monitor

1 Answer

Blue Power light blinks on and off. no disply

The power supply is failing. One of the filter capacitors (1000 microfarad, 16 V, radial lead) has shorted and this kills the power supply. I have fixed 2 Viewsonic 930s by replacing the caps. However, if you do not know anything about electronics, please do not attempt replacing the capacitor. Installing the cap backwards will create additional problems. Also, the case is a bit of a bear to open.

Dec 14, 2009 | ViewSonic VG930m LCD Monitor

1 Answer

The power supply light is green but when i push the power button on the front on monitor nothing happens! Do i need to crack open the case and look for a broken solder connectionor could it be something...

If you can open and removed the power supply/inverter board you can check the caps for obvious damage. *(leakage or swelling)

You can pull the offending cap or just do what I did and replace ALL the caps on that part of the power circuit. It isn't expensive and the board is big enough to handle soldering without a lot of hassles.

I did this for an old Dell monitor this past week and it is up and running!
Nice and bright too.

Good luck!

Nov 22, 2009 | ViewSonic VG150 15" LCD Monitor

1 Answer

Hitachi color display cml175sxw doesn't power on green light flashes

Green flashes when PWM controller in the switching power supply turns into protection caused by overloading, which in most cases caused by popped electrolytic capacitors. Open the monitor, get access to the power supply module and observe there for those caps which are rounded on top. Replace them all. Also check for cracked solder junctions under large-size parts. These are most common reasons.

Sep 13, 2009 | Hitachi 17" CML175SXW LCD W/SPEAKERS...

1 Answer

Emachine won't turn on

With an Emachine it can be the power supply or the motherboard.

My guess it is the capacitors on the motherboard. Check to see if the round cylinders on the motherboard are bulging on the ends, and possibly rusty looking. Esp around the Main CPU/Fan.

They are notorious for bad capacitors.

If the caps look good, it still could be the motherboard, or maybe the power supply. Switcing out the power supply is pretty easy.

disconnect all the power connectors
unscrew the 4 screws on the back of the computer
remove and replace the power supply.
Make sure you get a power supply with as much power, or more is much better. 350 watt or higher.

For more on the capacitor plaugue, check here

Mar 25, 2009 | E-Machines Emachine T5026 power supply **...

1 Answer

Digital Stream HD 3150 OTA HDTV tuner does not operate

Disclaimer: The answer provided is entended for you to have some basic electronic knowledge and soldering skills.

Troubleshooting switching power supplies just sucks, but there are ways of finding the fautly componets. In my case, a visual inspection found 2 bad capitors, the tops bulging open and oosing goo. If you look at the tops of any other caps they should be flat. You can also note faulty caps by discoloration of the circiut board itself. I had one other faulty cap on my supply that, by visual inspection had been running hot. After replacing the defective caps (Nichicon 105c) I went with an ohm meter, and checked the smaller transistors for faults. Q1 a very common transistor was bad (2N3906) with a base emitter short. In conclusion, it's the cheap caps that are at fault, sometimes taking the silicon with them as they short out. The unit is now working.
As an added note, I understand that there is a Radio Shack branded version of the HD3150 as well.

Jan 05, 2009 | Pbi HD3150 DTV Receiver

1 Answer


The backlight power supply in the H950 series suffers from a manufacturing defect. Hansol might replace the unit even if it's not covered by warranty anymore. Contact them.

Otherwise (and if you have electronics skills), replace the electrolytic caps in the monitor's power supply. Take proper high voltage precautions!
  • Disconnect mains
  • Wait at least one day for caps to discharge a bit
  • Remove monitor stand (four screws)
  • Put the monitor face-down on the table, plugs facing to you
  • Remove back cover (snap-in, difficult to open without minor damage) - be cautious: front buttons are connected using a rather short cable, do NOT try to remove front cover
  • Remove EMV casing screws (four screws) and ground wire
  • Disconnect CCFL tubes (four connectors), noting connector orientation
  • Disconnect front buttons pcb
  • Lift EMV casing side facing to you
  • Disconnect power supply board (left) from signal board
  • Unscrew/remove power supply board - caution: C12 is likely to store mains voltage even after days!
  • Replace caps (C34 and C66 are likely failure candidates for IPHS19-S rev1.2 boards; you might also replace C31, C32, and C35 while you are at it) - higher voltage and temperature rating are okay, capacity has to match
  • Assemble everything again

Nov 10, 2008 | Hansol H950 19" LCD Monitor

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