Samsung LCD LN-S4051D, replaced caps, same issue

[mack505]

Hi all, I have replaced the 7 recommended capacitors on the PSU as recommended, but still having the picture go out after the TV runs for a while. It gets pretty warm.

The picture will not come back on unless I reseat all the connectors on the PSU board. Then once it gets warm, it cuts off again.

Any ideas?

[ReeceyBurger123]

Re: Samsung LCD LN-S4051D, replaced caps, same issue

What mainboard is it ?

[CapLeaker]

Re: Samsung LCD LN-S4051D, replaced caps, same issue

Hi all, I have replaced the 7 recommended capacitors on the PSU as recommended, but still having the picture go out after the TV runs for a while. It gets pretty warm.

The picture will not come back on unless I reseat all the connectors on the PSU board. Then once it gets warm, it cuts off again.

Any ideas?

cold solder joint?

[mack505]

Re: Samsung LCD LN-S4051D, replaced caps, same issue

The main board is a BN41-00679D. 6/26/2006.

Some of the capacitors had been replaced before as part of the warranty. I think when I unsoldered this time, the solder pad lifted up on 2 of them. Dead in the water?

[CapLeaker]

Re: Samsung LCD LN-S4051D, replaced caps, same issue

pictures?

[Terryfictv]

Re: Samsung LCD LN-S4051D, replaced caps, same issue

Solder connects on ICM801 regulator

[budm]

Re: Samsung LCD LN-S4051D, replaced caps, same issue

Is this your main board?
http://www.shopjimmy.com/samsung-bn9...main-board.htm

[mack505]

Re: Samsung LCD LN-S4051D, replaced caps, same issue

Hard to get good pics, but here are a few. I obviously need to get better and solder/desoldering, just wonder if this one is toast.

Solder connects on ICM801 regulator

The solder connects look ok on ICM801

[mack505]

Re: Samsung LCD LN-S4051D, replaced caps, same issue

Is this your main board?
http://www.shopjimmy.com/samsung-bn9...main-board.htm

Yes, that's it.

[CapLeaker]

Re: Samsung LCD LN-S4051D, replaced caps, same issue

Ooyyyyyyy! But that can be repaired easily, at least for someone who knows how.

[mack505]

Re: Samsung LCD LN-S4051D, replaced caps, same issue

Ooyyyyyyy! But that can be repaired easily, at least for someone who knows how.

Yeah... pfffvt. Welp, any direction? I saw this thread that shows someone exposing the copper, tinning it and using a patch...

http://home.comcast.net/~machrone/bjr/mistakes.htm

[CapLeaker]

Re: Samsung LCD LN-S4051D, replaced caps, same issue

Yep, you got the idea! You also can use a small piece of wire, to the exposed copper and one turn around the leg of the cap. maybe google something like pcb repair or trace / pad repair... something along that line.
What happened to you was / is your soldering iron ran out of heat, it isn't big enough wattage wise.

[Terryfictv]

Re: Samsung LCD LN-S4051D, replaced caps, same issue

Clean off flux with old toothbrush and denatured alcohol.

[mack505]

Re: Samsung LCD LN-S4051D, replaced caps, same issue

Yep, you got the idea! You also can use a small piece of wire, to the exposed copper and one turn around the leg of the cap. maybe google something like pcb repair or trace / pad repair... something along that line.
What happened to you was / is your soldering iron ran out of heat, it isn't big enough wattage wise.

Ok, I will give it a shot. So I was using a desolderer, with the bulb that sucks up the solder. The soldering iron I have is a 15/30w, usually use it on 30.

[CapLeaker]

Re: Samsung LCD LN-S4051D, replaced caps, same issue

yeah... I figured.

[mack505]

Re: Samsung LCD LN-S4051D, replaced caps, same issue

yeah... I figured.

I should grab a higher watt iron than my 30 you think? And/or should I avoid using the desolderer?