Sharp lc-42sb45u power issue

[carltonfire176]

Ok. I was recently given a broken television for a project. It is a 42" Sharp lc-42sb45u. The guy who gave it to me said the tv would work for a little while and randomly shut itself down. After I picked it up and got it home, I plugged it in to test it. When I plugged it in and tried to turn it on, nothing happened.

I checked the cord, and the connection to the tv and the wall. What should I do next?

[tom66]

Re: Sharp lc-42sb45u power issue

Do you have a digital multimeter, and a camera?

[carltonfire176]

Re: Sharp lc-42sb45u power issue

I'm pretty sure I have one out in my toolbox, and as far as a camera goes I have one on my phone (galaxy s5)

[tom66]

Re: Sharp lc-42sb45u power issue

OK could you remove the back cover of the TV and get us some clear photos of all of the boards inside the set. I use an S4 to take my photos so the S5 should be at least as good. Just make sure to get them in focus. A photo of your meter will also help.

[carltonfire176]

Re: Sharp lc-42sb45u power issue

sorry for the delay. I got caught up between work and fire calls I havent had a chance to mess with it too much. Anyway heres the pictures.

My Multimeter


Main board


Power Supply


Controller Board?


And lastly the board behind the buttons, not sure what its called


I used my multimeter last night and tested the resistance across the fuse above the power port. It tested at 6.5 so im assuming the fuse is good.

[jetadm123]

Re: Sharp lc-42sb45u power issue

Your 3rd photo shows the power supply. Is that large capacitor closest to the upper right wiring harness domed?

[carltonfire176]

Re: Sharp lc-42sb45u power issue

If this is the right one i circled it is

[Alastair E]

Re: Sharp lc-42sb45u power issue

Yup--thats the one--Will need replacement.

Check closely all the others for doming too, replace those that look domed.....

[budm]

Re: Sharp lc-42sb45u power issue

One is already bad, you might as well replace them as a set including those on the inverter board (CMO).

[carltonfire176]

Re: Sharp lc-42sb45u power issue

thanks guys, ill look for the parts tonight. By replacing those, I should get power correct?

[carltonfire176]

Re: Sharp lc-42sb45u power issue

is this what I need?

http://www.ebay.com/itm/CAP-DIODE-RE...item3386fc0dd9

[carltonfire176]

Re: Sharp lc-42sb45u power issue

or this?

http://www.ebay.com/itm/CAPACITORS-p...07997657&rt=nc

[jetadm123]

Re: Sharp lc-42sb45u power issue

Try this:

http://www.ebay.com/itm/Sharp-LC42SB...item4d06c815df


Be sure to compare the capacitor values in the listing to the ones that are actually on your board. If there are differences, notify the seller and see if they will substitute the correct value.

[tom66]

Re: Sharp lc-42sb45u power issue

TBH I'd just get the caps from Digikey or if Topcat (site admin) stocks them, from badcaps.net store. It'll be cheaper and you'll be certain you're getting good, high quality replacements. If you need help choosing the right ones just ask.

[carltonfire176]

Re: Sharp lc-42sb45u power issue

tom66, can you point out which ones for me. to be honest i have no idea what im looking for.

[carltonfire176]

Re: Sharp lc-42sb45u power issue

I looked into them on the sites store. I have 2700uF 16volt caps on the board now but they are not listed in the master catalog.

[Alastair E]

Re: Sharp lc-42sb45u power issue

I looked into them on the sites store. I have 2700uF 16volt caps on the board now but they are not listed in the master catalog.

Use 3300uF 16V will be fine, 2700uF isnt a hugely popular value.....
--The slight higher value wont make any difference where they are...

[carltonfire176]

Re: Sharp lc-42sb45u power issue

okay! =) thank you. Also I noticed on the board that there are 4 capacitors but 1 of them is shorter than the other ones. Will that make a difference?

[carltonfire176]

Re: Sharp lc-42sb45u power issue

Also, 3300uF in a 16v are not listed on the sites store either. If i were to get them through digikey, which type would I need?

[Alastair E]

Re: Sharp lc-42sb45u power issue

Not really, just match the component values reasonably closely.