Samsung LN46A650A1FXZA

**Caleb** · 07-13-2013, 06:13 PM

Re: Samsung LN46A650A1FXZA

Its an inductor, could be high resistance causing it to overheat and go open. You should be able to temporarily pull it and solder in a bypass and see if your problem goes away. Im sure more experienced voices will chime in shortly.

**splitcrete** · 07-13-2013, 06:23 PM

Re: Samsung LN46A650A1FXZA

Thank you for that info. what kind of wire should I use don't want to burn the ins. off the jumper wire or should I use a recycled jumper from a junk board. Thanks

**budm** · 07-13-2013, 06:56 PM

Re: Samsung LN46A650A1FXZA

That is the inductor for buck switching power supply, do not bypass it or or you will cause more damages, there is MOSFET next to it that is part of the switching circuit, if that MOSFET is shorted instead of switching on and off at high frquency, it will cause lots of current flowing through that inductor. There is an IC for driving the Gate of that MOSFET, the Gate drive may stuck high due to bad IC. You can also have shorted load.

**splitcrete** · 07-13-2013, 07:13 PM

Re: Samsung LN46A650A1FXZA

I didn't try the jumper. Do you know what the voltage coming out of that inductor is.Their are a lot of people having the same off on problem with this set. If I desolder the inductor should i get a 0 ohms reading through it?

**budm** · 07-13-2013, 09:27 PM

Re: Samsung LN46A650A1FXZA

The resistance of that inductor will be really low, you will need to find the diagram of this TV to really do in depth troubleshooting to component level.
Did you look at elektrotanya.com to see if it has the service manual for this TV?

**splitcrete** · 07-14-2013, 12:12 AM

Re: Samsung LN46A650A1FXZA

Samsung don't let it manuals float around on line,but I will check your site and do some more poking around on line and at the city library. In the mean time I put a small fan over the inducer to pull away excess heat . Its from a Sony xbr5 now I have a frankenlcdtv.lol . Seems to be working so far but I have the ac on now. Thanks for the lead for a manual.

**splitcrete** · 07-14-2013, 12:34 AM

Re: Samsung LN46A650A1FXZA

A few more pics of that board.

Attached Files

**tom66** · 07-14-2013, 02:25 AM

Re: Samsung LN46A650A1FXZA

On the right of this board where does the flat flex connector go?
https://www.badcaps.net/forum/attach...0&d=1373783549

I do not remember that on both of my LE40A656's I have fixed, which are very similar models.

**splitcrete** · 07-14-2013, 07:44 AM

Re: Samsung LN46A650A1FXZA

that flat cable goes to the side of the tv for a/v out..

**tom66** · 07-14-2013, 07:45 AM

Re: Samsung LN46A650A1FXZA

Can you show us a picture of the whole chassis for our reference?

**splitcrete** · 07-14-2013, 07:58 AM

Re: Samsung LN46A650A1FXZA

Took the questioned inductor off.Took a ohms reading and I get 0.0 The fet is not shorted there is a small diode to the left even with bottom of inductor. That is very hot also 185+ deg.I'm going to solder one end off and get a reading today. if it is sending current both ways will that make the inductor hot. Where is the ic that tells the fet to open and close. Thanks so far for the help ,you guys are keeping a lot of e-waste out of land fills,and I am learning a bucket full of info.

**tom66** · 07-14-2013, 08:06 AM

Re: Samsung LN46A650A1FXZA

An inductor in a buck converter will have current flowing one direction in most cases, but I couldn't think of a fault that would cause it to have current flow the other way... or even what that would cause. Personally, I'd be focusing more on that large heatsinked processor.

**splitcrete** · 07-14-2013, 08:28 AM

Re: Samsung LN46A650A1FXZA

I will get a picture of the whole chassis today . I will have to take the back off again. When I change something, I always put it all back together, so not to change any other conditions of when the problem started. I know that may be a bit much of me, but I like to do things right the first time.

**tom66** · 07-14-2013, 08:34 AM

Re: Samsung LN46A650A1FXZA

I've never had issues with working with the cover off after 50+ TVs. There should be no problem in doing so.

**splitcrete** · 07-14-2013, 09:46 AM

Re: Samsung LN46A650A1FXZA

Here are requested pictures . If you need sharper pics I will have to borrow my daughters camera. professional photographer. Any one like my Frankenstein fan job?

Attached Files