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Equipment Repairs => LCD TV forum => Topic started by: scthmr6 on March 15, 2011,11:16:39

Title: Samsung LE40R74BD problem - burning smell. With clear photos!!
Post by: scthmr6 on March 15, 2011,11:16:39

Any help at all will be great on this!

Ive got an LCD LE40R74BD Samsung TV that's started to hiss and then starts smelling of burning. The display is fine at the moment but this could be the start of the more common problem i suppose where the backlight packs in? Ive taken the back off and there is a connection that has burnt. The reason i think this is a different problem is that the capacitors are all looking fine. Here are photos to show clearly which part i mean.

Label:
(http://img27.imageshack.us/img27/4339/snv36640.jpg)

Board with everything on:
(http://img25.imageshack.us/img25/2197/snv36631.jpg)

Part removed that has a dodgy burnt connector: (I believe this is the Backlight Transformer)
(http://img806.imageshack.us/img806/1410/snv36630.jpg)

(http://img859.imageshack.us/img859/9840/snv36632.jpg)

Here you can see the burnt bit:
(http://img84.imageshack.us/img84/7522/snv36636.jpg)

(http://img535.imageshack.us/img535/8584/snv36637.jpg)

And on the other side it looks like this:
(http://img822.imageshack.us/img822/1460/snv36627.jpg)

(http://img707.imageshack.us/img707/2965/snv36628.jpg)

From what i can work out i believe it might be the Backlight Transformer on its last legs but how do i tell if this is the main cause of the issue or whether something else is causing this to overheat?

(http://img225.imageshack.us/img225/8259/snv36635.jpg)

(http://img402.imageshack.us/img402/3353/snv36633.jpg)

But to be honest i dont know much about electronics but I will always have a go at fixing things myself. Anyone know if this is a common fault with these?

Any help on this problem would be great!
Or any advice on where to get this part from (if this is the broken part) in the uk?
Or does any one have any thoughts on what could be causing a connection like this to overheat?

Thanks,
Scott

Title: Re: Samsung LE40R74BD problem - burning smell. With clear photos!!
Post by: watteau on March 15, 2011,11:57:13

Hello,
 
From the pictures it looks like the tranformer connection had a dry
joint and has been arcing. Did you try resoldering it?

Regards,
John

Title: Re: Samsung LE40R74BD problem - burning smell. With clear photos!!
Post by: scthmr6 on March 15, 2011,13:28:48

Quote from: watteau on March 15, 2011,11:57:13

Hello,
 
From the pictures it looks like the tranformer connection had a dry
joint and has been arcing. Did you try resoldering it?

Regards,
John

I haven't really as i thought it might have been a fault that caused this rather than just a join. If it's just a bad connection that would be perfect! Ill solder it back on and see how it goes!

Thanks,
Scott