proscan PLDED3996A-C2 NO PICTURE POWERS ON

[budm]

Re: proscan PLDED3996A-C2 NO PICTURE POWERS ON

Is that is? Just one board? Where is the "We also need you to upload good clear pictures of the whole back side of the TV showing ALL the boards"?

[paulstef]

Re: proscan PLDED3996A-C2 NO PICTURE POWERS ON

When it's NOT working do the following:

Measure the voltage over the big black capacitor.
Measure the voltage at the LED output connector (little white one to the left (2nd pic))
If you have an oscilloscope take a screenshot of what happens at this connector when you try to start to the TV. If a LED is defective it may just give a very short pulse and then shut down.

Post your findings/measurements here.

[SamyBoyz]

Re: proscan PLDED3996A-C2 NO PICTURE POWERS ON

I noticed when i bend back and forth the board near the 110v in, Tv works fine...i redid the solder even popped it in the oven for 10min like we do in I.T. with laptop motherboards and still same issue, bend the board near the 110v in and it works, bend it some more and it doesn't..

[SamyBoyz]

Re: proscan PLDED3996A-C2 NO PICTURE POWERS ON

Tv turns on fine sometimes...and it works flawlessly but other times it does not turn on at all, I don't have an oscilloscope unfortunately, i'm wondering if it could be bad caps that work intermittently?

[dick_barton]

Re: proscan PLDED3996A-C2 NO PICTURE POWERS ON

From your last two posts it definitely looks like a poor solder joint if flexing the board makes it work/not work. Get the magnifier out and resolder all joints once more. Look for a crack in the tracks.

[SamyBoyz]

Re: proscan PLDED3996A-C2 NO PICTURE POWERS ON

I redid most of the solders and even put the board in the oven..yet no luck none of the capacitors look bad, and the coils seem ok as well...weird

[vinceroger69]

Re: proscan PLDED3996A-C2 NO PICTURE POWERS ON

transformer wire issue where its soldered to the legs that go through the pcb? the part you cant see unless you desolder the transformer.

[SamyBoyz]

Re: proscan PLDED3996A-C2 NO PICTURE POWERS ON

Ok good, i will have a look!

How about the 470 capacitor in the picture (on the upper right side near the wires), does it look ok to you? Thx

[vinceroger69]

Re: proscan PLDED3996A-C2 NO PICTURE POWERS ON

Ok good, i will have a look!

How about the 470 capacitor in the picture (on the upper right side near the wires), does it look ok to you? Thx

hard too say in the pictures but does look slightly domed can you remove and test if you have a esr meter also the multi strand wire connector lvds just in front of that capacitor is that fitted right? on all the pins the picture may just be deceiving

[SamyBoyz]

Re: proscan PLDED3996A-C2 NO PICTURE POWERS ON

I believe the problem was the 2 capacitors, i changed them and tv started working more regularly but looks like i de-soldered the old caps without the right tools so now the little spots where i am to solder the capacitor's legs are damaged it seems, i attached 2 pictures of the crappy soldering job i did, was wondering if there was a way to repair

[SamyBoyz]

Re: proscan PLDED3996A-C2 NO PICTURE POWERS ON

Hi,

Would you by any chance be able to tell me what might cause the red light not to go on anymore? Up until i changed the capacitors the red light would go on but the tv was intermittent, now it just doesn't light up anymore..

[SamyBoyz]

Re: proscan PLDED3996A-C2 NO PICTURE POWERS ON

Anyone?

[heavymachines]

Re: proscan PLDED3996A-C2 NO PICTURE POWERS ON

if u want help take pic of entire tv set and also try to salvage that board u did soldiering on. What iron you using? Try to clean it with rubbing alcohol and see how bad the damage is. doesn't look so good.



Being a multilayered mainboard it is crucial delicate soldiering. Need to see up close and clean to see how bad the pads &Thru-hole is. Since you don't have led anymore it is clear there is either no connection or it is grounded out by nearby tracks and or pads. it will need to be reworked. Make sure you use flux and a good iron with clean tin tipped iron very important, and if you're transferring too much heat to pads you will destroy pads, so no long lingering time on contact let it cool little bit.

[Dragonfire78]

Re: proscan PLDED3996A-C2 NO PICTURE POWERS ON

So i got a proscan PLDED3996A doing same thing turn on black screen. But shine a light and can see the picture im no tec and no idea wth im doing lol but. Found this from was told could be back led lights bad then read could be power supply then read could be bad led video driver board one the hdmi plug into and stuff im lost what check

[dick_barton]

Re: proscan PLDED3996A-C2 NO PICTURE POWERS ON

Draginfire78
Read through the post by RJ which you should find helpful.

https://www.badcaps.net/forum/showthread.php?t=45707

[neilc6]

Re: proscan PLDED3996A-C2 NO PICTURE POWERS ON

Every RCA/Proscan/Element/Haier I looked at that turned on with no backlight or flash of backlights had bad backlights. https://techhometravel.com/lg-ln-ser...ed-backlights/