samsung LN-S4051D diagnal lines

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

But are the conductors still show continuities between each end of the wires?

inlets are tiny, multi meter probes wont fit.

[budm]

Re: samsung LN-S4051D diagnal lines

But are the conductors still show continuities between each end of the wires?

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

better pic.

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

crap, was looking and found this burn mark on connector wires from a board to g board, wonder what caused this, thinking its bad.

[budm]

Re: samsung LN-S4051D diagnal lines

popped in a pr1005, rated at 600, now getting the same .058 both ways in diode, on ohm I get 63.5 and 62.8 in other direction, still trying to wrap my little brain around soldering the cap in parallel on the a board, Thanks.

As I indicated, the Diode is connected in parallel with the relay coil (62 Ohms), it is snubber to reduce the kick back voltage from the relay coil back into the circuit and damage the drive transistor. This section of the power supply board is not the problem, you are looking at the wrong place.
http://electronics.stackexchange.com...-or-transistor

[nomoresonys]

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.

will try my best to figure out how to do it, Thanks budm.

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

with only g board hooked up, getting 6.45 on stby, and no other voltages, i think thats normal with just the one board hooked up, now I think I need to jumper my board from stby to p-on, not seeing a ps-on, do I need to leave the jumper connected or is it just touch and release?, Thanks.

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

I am sure you have some diode in one of the spare boards you have.

popped in a pr1005, rated at 600, now getting the same .058 both ways in diode, on ohm I get 63.5 and 62.8 in other direction, still trying to wrap my little brain around soldering the cap in parallel on the a board, Thanks.

[budm]

Re: samsung LN-S4051D diagnal lines

I am sure you have some diode in one of the spare boards you have.

[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.

[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

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.

[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.

[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

[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.

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

this ones a little better, the light is bad.

[nomoresonys]

Re: samsung LN-S4051D diagnal lines

yes, c1701.

[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

[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.

[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.