samsung LN-S4051D diagnal lines

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

Which one of these is you board?
http://www.shopjimmy.com/samsung-bn9...ain-board.htm#
http://www.shopjimmy.com/samsung-bn9...main-board.htm
Does your board have this cap?

its the lower one, bn94-01091b.

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

i ll try to get a good pic of power supply.

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

http://assets.shopjimmy.com/media/ca...bn4400134a.jpg ds805 read .058 in both directions, ds804 read .344, I think they are suppose to be .4 to .7?

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

That model tv is known for bad panels. I would change the caps,and diodes to see if any thing changes.

Thanks splitcrete, I wonder if another power diode about that same size, off an old pc power supply would work?

[budm]

Re: samsung LN-S4051D diagnal lines

http://assets.shopjimmy.com/media/ca...bn4400134a.jpg ds805 read .058 in both directions, ds804 read .344, I think they are suppose to be .4 to .7?

Can you provide the bottom side pictures, and one especially around DS805?

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

Can you provide the bottom side pictures, and one especially around DS805?

I'll do my best with this 5pm camera.

[budm]

Re: samsung LN-S4051D diagnal lines

It is not mega pixel, it is the lights and the MACRO, and tripod or very steady hands, I use my over 10 years old SONY with good MACRO mode and <2M pixel.
https://www.badcaps.net/forum/showth...ight=dell+2007

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

ok, will try to get some better ones outside in the daylight.

[budm]

Re: samsung LN-S4051D diagnal lines

Well that DS805 (1N4937) is the snubber Diode for the Relay REL801, it is connected in parallel with the relay coil (Omron G5RL 5vdc COIL, about 62 Ohm DCR) that is why it show conduction in both direction, that is why I ask you to take the RESISTANCE reading of the Diode, not in the Diode mode, I get some idea what the resistance is.
When you check semiconductor for shorts, leakage resistance, you use Ohm mode because when semiconductor shorted out it will no longer act as semiconductor.
you can use 1N 4007 in its place. You can verify by check the resistance of the two copper pads where the diode's legs are connected to and see what resistance you get.
BTW, if the power supply is bad it will affect not just the pictures but also other circuits as well.

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

Well that DS805 (1N4937) is the snubber Diode for the Relay REL801, it is connected in parallel with the relay coil (Omron G5RL 5vdc COIL, about 62 Ohm DCR) that is why it show conduction in both direction, that is why I ask you to take the RESISTANCE reading of the Diode, not in the Diode mode, I get some idea what the resistance is.
When you check semiconductor for shorts, leakage resistance, you use Ohm mode because when semiconductor shorted out it will no longer act as semiconductor.
you can use 1N 4007 in its place. You can verify by check the resistance of the two copper pads where the diode's legs are connected to and see what resistance you get.
BTW, if the power supply is bad it will affect not just the pictures but also other circuits as well.

Thanks Budm, I thought all diodes were one way, now in my ignorance I took off and broke a good part, I'll try to find a replacement.

[budm]

Re: samsung LN-S4051D diagnal lines

You can use any rectifier diode with 500~1000V rating in that location.
"I thought all diodes were one way" Yes they are but when they shorted out it will show resistance both way, but that is not the problem with your diode, it is connected in parallel with relay coil that has resistance of around 62 Ohms so it shows up as bad when you check it.

[budm]

Re: samsung LN-S4051D diagnal lines

So does your main board has this cap on the bottom side?
https://www.badcaps.net/forum/attach...2&d=1420085798

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

yes, c1701.

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

this ones a little better, the light is bad.

[budm]

Re: samsung LN-S4051D diagnal lines

OK, try soldering another cap in parallel with that cap, anything between 47~100uF 10VDC, the white bar on that cap is POSITIVE so make sure the positive of the added cap goes to that bar side. See if it changes the symptom on the screen.

[chrismurphy]

Re: samsung LN-S4051D diagnal lines

sorry you dont have the electronic skills to repair this tv
My advice is to give up and save your money

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

ok, back at it, just had to add a troll to ignore list, God bless the lonely trolls, with no social skills, not even online, hohoho.

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

You can use any rectifier diode with 500~1000V rating in that location.
"I thought all diodes were one way" Yes they are but when they shorted out it will show resistance both way, but that is not the problem with your diode, it is connected in parallel with relay coil that has resistance of around 62 Ohms so it shows up as bad when you check it.

Thanks budm, sorry to be so thick, when you say 500~1000v, do you mean voltage-forward, voltage-dc reverse or current-reverse leakage, I'm guessing 500~1000 means from 500 up to 1000.

[budm]

Re: samsung LN-S4051D diagnal lines

1n4000 series Diode, look up the spec sheet, the 1n4007 has PEAK reverse voltage rating of 1000V (700V RMS).

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

1n4000 series Diode, look up the spec sheet, the 1n4007 has PEAK reverse voltage rating of 1000V (700V RMS).

ok, Thanks Budm.