Why is there no picture?

Wow so you've spent a lot already. I'd buy a new tv dude. It sound to me like something else has failed on a power board and they just don't replace small parts anymore you need to spend the money to replace the boards usually unless you find an old school TV technician willing to do it. It could be a the power supply so before you try anything costly see if you have a similar power rated supply around the house and see if that is the problem. Good luck. + Google the issue and you may find it to be a simple answer.!

Why would you replace capacitors in the first place? As an electronic repair engineer, I only replace capacitors when they are defect. And not because something is not working. It could be your power supply is defect, but there can be lots of other causes, like bad connection or broken cabling. It also can be possible the audio amplifier or the screen has a shortage driving the power supply in protection.
Leave repairs to people who know what they are doing. When you have replaced some things in the system, it could be the repair is extra expensive, because you caused more damage than you solved.
Consult a tech, it will save you money and lots of time.

Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time.

Dont know if this will help but it may be your main a/v board. I have a Sammy LCD and recently experienced similar issues. Tv wouldn't hold a picture or stay on. Once my tv would finally come on, any time I had something pluged in, in any input/with any input (composite, hdmi, component, or coax) and turned it on, the picture would go crazy and tv would shut off. The tv shutting off was due to the fact the tv was protecting itself from further damage. After lots of problem solving and talking with a tech, it was determined that my main a/v board was at fault. Sure enough as soon as I pulled out my main board and inspected it, it was obvious the board was bad. Not saying this is for sure your problem but it is very similar to what just happened to me. The boards are very easy to replace. Just a matter of unplugging some cables and unscrewing some screws. I found a replacement board on ebay and put it in myself. Doing the investigation on my own, opening it up and looking at the boards, and chatting with a with knowledgable techs and people on this site saved me A LOT of money. Again not saying this is your issue but you are having very similar symptoms that I have.

Hi


Thanks for using FixYa. As you have already replaced the Z-sus and the main logic board then the issue seems to be with the Y-main and/or Y-sus board. You’ll need to take the back off and check for any blown/bulged capacitors that might have gone bad and causing this issue. Please do accept the solution if the issue is resolved or post a comment for further assistance.


Thanks
Rylee

It sounds like either the X-Main board or the Main Board has failed. I recommend calling 1-800-samsung to find the nearest service center to repair it. You can spend a lot of money replacing parts on a plasma before you find the defective part.

you tv has two boards inside a power supply one and a main one so the main one its the one controlling all your imputs picture and sound too manufacturer and tv repair guys waste of money go to www.shopjimmy.com search your tv and model for the main board. The price you r going to be satisfied without complaint.

yea it sounds like a main-board or inverter board.. sounds like the panel of the television is loosing power and you are still getting sound..

Olevia did go out of buss.. but i know this 3rd party repair center called Amergence technology is offering to repair Olevia's. But the thing is that the whole television will have to get service they don't sell parts so you might want to give them a call and get an idea on the repair quote.. 866-965-3842

the Y-main board is going out, or the Y-scan buffer, but probably the Y-main

Had the same problem, took the back off and found some bad soilder joints on two of the main circut boards. Re-soildered and appears to be fixed.