samsung ln-t4069f power issue

[whitesnake]

Just got that samsung TV for free and in the process to figure out what is going on.When the tv start,the screen slowly become white like clouds,then nothing happens.After 7 to 15 attempts the screen light up and the unit work fine.

I was aware of the capacitor issue so i replace 6 of them: 4X 10v 1000uf and 2X 25v 1000uf but it diden't solve the issue.

Any idea what to look for?I search for hours but could not pinpoint anything.

[Jonny g]

Re: samsung ln-t4069f power issue

Did you check all capacitors? I had this issue a few years back and I had missed one.

[whitesnake]

Re: samsung ln-t4069f power issue

there where 3 that i left there,two small one and a huge one in the middle of the PS.They looked ok and i never seen these one bulged in my search

[Jonny g]

Re: samsung ln-t4069f power issue

Just double check all, see if any bulge at all. To me sounds like a faulty capacitor as you keep attempting to turn it on, build up a charge, then it works fine.

[whitesnake]

Re: samsung ln-t4069f power issue

Can a tiny cap can cause these kind of issues?TBH i did not notice if they where buldged so i will open the case and double check.

[budm]

Re: samsung ln-t4069f power issue

Bad caps can look normal but it have high ESR or lost its capacitance. Let the TV cool down then heat up the power supply board with hair dryer for 3~4 minutes then plug the TV and turn it on, if it is still bad then I would take the DCV readings on the power supply connector pins on the cold side, the DCV on the T-CON fuse, then if the TV starts working again then take the DCV reading to see what the difference you get.
You should also up load good clear pictures of the whole back side of the TV so we can see all the boards.

[whitesnake]

Re: samsung ln-t4069f power issue

ok thnks for your help tomorrow i will open the case and upload clear pictures and try to give you the readings you ask for.

[whitesnake]

Re: samsung ln-t4069f power issue

ok back at home i blew some heat like mentioned but still the same symptoms.I took the best shots i could with my iphone.If you need any more info i will try to provide it asap.I will tcheck dc voltage now and send the results later.Yhanks for your help!