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Capacitor setup Part of an experient. Want to use a capacitor to light a light bulb. Does it have to be connected to a circuit board then to an on off switch? If so what kind of circuit board? Can I buy one ready made?

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Yes, to light a bulb with a capacitor, they must be in series. And you will need to charge the capacitor, be "carefull" not to touch them. The Ohms law P (in Watts) I (in Ampere E (in Voltage) will be true in relation to how many current to use on the size of your wire. Thanks for using Fixya.

Posted on Mar 23, 2014


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Tv popped and went off, there are 2 circuit boards how can I tell which is bad, power board or audio video board,, no lights on tv work at all, complete zip

If you Heard a popping sound. Most likely it was a capacitor that went bad. Yahoo search capacitor to see a picture.
Usually capacitors swell when they go bad. if you Don't know How to spot it. Concentrate on the circuit board you plug connects to and check to spot the capacitor. You might not actually have a standard capacitor. So look for a film capacitor as well.

Good luck

May 19, 2016 | Vizio L32 32 in. LCD HDTV

1 Answer

Sanyo plc xu115 new bulb wont fire. power light turns green at first but after a few seconds it turns flashing red. the old bulb exploded on this projector.

Could be a burnt capacitor on the circuit board. Replace capacitor if you can determine which one it is. There are only a few.

Apr 20, 2011 | Sanyo PLC-XU115 Projector

1 Answer

Where is the lamp in lg rt-62na31rb tv

It has been my experience that there are MULTIPLE lamps in most flat panel T.V.'s, unlike smartphone,P.D.A.'s and laptops where the screens have either a single cold cathode fluorescent light bulb ( contains mercury so careful not to break!) or an L.E.D. array that's reflected ( up usually ) though clear plastic behind screen. flat panels though are extremely difficult to repair on account they may have as many as a dozen bulbs. not to mention being located directly behind the screen so it's literally parts of the lcd, laptops are kinda screwed in and secured with metal tape at bottom for example-my experience has also been it'll usually be the power supply that drives the lamps that are bad and unless your lucky/good enough to diagnose which component has given out ( sometimes it's an electrolytic capacitor that looks a bit rounded on the top or has pushed it's rubber seal down against circuit board) they don't come cheap.Good luck hope this helped

Mar 30, 2011 | LG Televison & Video

1 Answer

My passenger side brake light won't work and I have already replaced the bulb, what should I do next?

Check the circuit board on the back of the tail light. I've had quite a few experiences with these having the plug go bad where it enters the circuit board on the back of the tail light. The circuit board is usually the issue, however, on multiple occasions, the plug had to be replaced as well. Please diagnose the issue with the solutions provided by myself and the other experts, if any. Before rating the assistance and leaving a testimonial. One final thought though. If you have towing capability and there are allowances for trailer lights the connection to that light may have become compromised needing attention. Please take into consideration the variables such as this and basing my determination on the information provided without personal examination. Thank you for using Fixya.

Jan 27, 2011 | 1997 GMC Sierra

1 Answer

When I plug it in the TV will not come on. However, the green light flashes constantly.

Hi chlundy, my name is John. Welcome to FixYa. You have a power failure in one of the circuits, probably the power supply board. If you have a little soldering experience, you can fix this yourself. Unplug the set and remove the back cover. Where the plug goes into the TV on the board, look for swollen or puffed up capacitors in this area, a capacitor bulged out at the top is bad. Look for cold solder joints on the circuit board, just resolder the joints, and replace the bad capacitors with the same Ohms value and watts rating. You will need a desoldering iron and solder for this job. Get parts here. Thanks for choosing FixYa. Good luck......John

Dec 11, 2010 | Televison & Video

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Magnavox 50ML8105D/17. We moved and the tv worked fine and now nothing. Just 2 red lights. Temp and Bulb. I replaced the bulb about 6 months ago. all I did was move.I carried it myself. I have checked and...

My magnavox died due to cheap capacitors on power supply board, a common problem for magnavox tv's from wot i found on net!
I replaced a 2200uf 10v electrolytic capacitor and it works now:)
My tv would take a few atempts to turn on and finally would not turn on,light stayed red!
i recommend visually checking for bulging or blown capacitors on power board, if it all looks good, try warming the board with a hair dryer, this might be just enough to get it to fire up, so at least u know the prob is in that area.
I looked for a 2200uf capacitor near the low voltage output from board n replaced it, got lucky first one, I was expecting to replace all the low voltage electrolytic capacitors.


Feb 02, 2010 | Philips Magnavox 50ML8105D 50" HDTV DLP TV

1 Answer

Checked tail light housing , those are ok , checked brake light switch , its good , all other lights work as they should , used circuit breaker to check for short and breaks immediately , I do know cruise...

Depending on the year of the vehicle, it may be one in which the taillights are connected via a printed circuit board. This is one of the worst designs in automotive history, as the board inevitably gets wet and the contacts corrode. Sometimes, smacking the tail light assembly will make it come on again for a while. If this is the issue, replacement of the circuit board is called for. The board clips to the back of the light housing. Prior to replacement, check for power at the wiring harness that connects to the tail light assemblies, and re-verify that both bulbs are correct and good, even if they don't look burnt. If there is power at the harness when the brakes are pressed, and the bulbs both light when 12v is applied directly to them, it is almost certainly the circuit boards. Note that on some vehicles, if one bulb fails, both will stop lighting. The cruise probably has nothing to do with it. If the vehicle does not have circuit board at the taillights, it may be one or more corroded or worn out bulb sockets. Sometimes, the center bulb contact can be cleaned and pried up with a screwdriver to make contact again, but this is a temporary fix.

Nov 25, 2009 | Saturn LS Cars & Trucks

5 Answers

Benq pb6100, light bulb does not on, power ok

I fixed the exact same problem on my PB6200. Both back fans were not working, and the bulb would not turn on.

In my projector, the fan board had a bad capacitor. The fan board is the one where all 3 fans are connected, and which is facing upside down on top of the powerboard. The bad capacitor on my projector was coded C7302 on the schematics. It's a brown, 25v 470uf capacitor.

I recommend you to open your projector, unplug all connections to the fan board, turn it upside, and inspect the capacitors and other components. Bad capacitors have a bulge and/or a black stain or fluid coming out on the top. You can find pictures on the net.

Jan 22, 2008 | BenQ PB6100 Multimedia Projector

1 Answer

Does not turn on. Only the red light otherwise it is dead....

Yes, first check the main fuse, if it is blown, before you replace this fuse you will need to do two things. Locate two capacitors on the power supply board, they will be labeled C 809 and C 810. You will need to resolder the negative connections on these capacitors. If you do not , the set will work when you replace the fuse, but will end up blowing out the capacitors or the regulator in the power supply. If you do not understand how to do this or you do not have any printed circuit board experience, play it safe and call out a tech to fix this set for you. Good Luck

Jul 16, 2007 | Toshiba 65H82 65" Rear Projection...

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