TV-plasma not work

[tornedoar]

hallo guys, I have tv plasma Samsung 50
the problem when I plug it in electrical I can hear relay sound and not stop like "tik tik tik...etc" but when I take off Z and Y sustain card then the tv work I can hear startup sound and relay work and of course no picture " bc no z and y" but when i test z voltage out of SMPS it only 5 V instead of 207V ..etc even when I took off z and y boards so where is the problem is it in Z and Y sustain or in power supply? someone work in repair told me the problem in Z and y but I can't believe that? how there 5V out of SMPS even when taking off z and y boards?

[edy]

I would take out the power supply and carefully inspect all the components, check caps, use a multimeter to look for open or shorted components, etc... as much as possible. Try to get board part # and find online schematics, and check for board repair kits online (for example try ShopJimmy.com) just to sniff out what kinds of components are included in the repair kit. This may give you a clue as to places to look first, as these include the most common failed parts.

Once you think you have repaired it you should also have a way to run the power supply independent from the TV and take from standby mode to full on (connecting certain connector pin to ground via resistor) which will turn power full on. Then you check voltage across caps or on output. Until you have ruled out that your power supply is good I don't see why you would want to mess with any other boards, it will only add more variables and may cause you to damage something else unnecessarily. Perhaps post photos of your board and part numbers here.

I just rescued a dumpster trashed 59" Samsung plasma and repaired it with help from this forum and a few others. You can see the full thread here:

https://www.eevblog.com/forum/repair/samsung-pn59d550c1f-59-plasma-doesnt-power-on/

Good luck and please post all details and photos.

[tornedoar]

thank you so much for replying but before start with anything, someone told me that there short cirucit in the panel and each time change Y main board it will break down again so does that could be true ? is it possible to be there short cirucit in the panel??

[edy]

I'm not sure what you are asking. Don't plug anything in until you test your boards, go over all components with a multimeter and try to at least narrow down the problem. You need to systematically check each board starting with main power since you are telling us it is making clicking from relay and only providing 5V output. Those boards draw power and maybe there is a flaw with the secondary boards so when you unplug from power you don't here the relay click anymore. But are you sure your power board is providing correct voltages even? You will need to provide more information and photos otherwise it will be hard to help you.