Question about Samsung PS42P2S 42 in. Plasma Television

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No screen signal

I have a tv that is a fiends that blew a main power supply fuse. I have replaced the fuse and now the relay operate and nothing will display on the screen except a very faint green glow. The menus wont work, it if their is a blown board but the problem is i wouldnt know where to start.

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  • kent george Mar 31, 2007

    Picture of one of the boards and the filter/power supply



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Send defective power boards to me, i will repair them.

Posted on Feb 22, 2008

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Kentg..aussie yeah .have the same model doing similar but makes a buzzing noise .i downloaded a complete w/shop manual for this and my tech mate is coming around home to check it out .will keep you posted .it is not advisable to muck around in there as there are some pretty high killable voltages in there.. send email address..

Posted on Feb 11, 2008


Could be bridge rectifier

Posted on Jan 10, 2008

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You must start by checking the panel supply voltages, if you look on the panel inside the unit you should see a label with a lot of voltages on it, such as V-set, V-scan, Va, Ve, there are test points on the power supply board and DC _DC board, that has the test points and the small adjustors for those voltages, check and see if they are correct or not, then start unplugging the cables connected to the other boards and check all the voltages again, those supply boards have a latch on circuit that will cause it to shut down, if you have back lights though, it could be only a board swap, most of the time it's a logic board or main board or a Y-main board, but you poweer supply could still be defective, good luck

Posted on Apr 01, 2007

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What is the 1 Amp fuse on the power supply driving?

Fault to the main power supply regulator section. Either it will be a separate board, or the part of main 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. Pull up older posts.
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. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

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Here are some basic steps that will help you fixing the problem.

I'm assuming that your unit is dead set without an standby LED light and your outlet is live.1.Power cord - check the cord it might be opened (no continuity).This is due to frequent bending,pulling. 2. Power switch - check for dry joints, open contact. 3.Check the internal fuse- sometimes the fuse fail because of the power surge, replacing with new one will cure the problem, If this is the case I would advice you to use surge protector/AVR (Automatic Voltage Regulator). However if the fuse blew again this is an indication that you have a shorted parts in the power supply, you may visit the link for more info. If no reaction and still the unit didn't power up then you have an open parts on the power supply.

4.If you see that the fuse is intact , don't attempt to touch anything because there some fatalcomponents stored electricity enough to hurt you with a simple mistake only. I would advice you to look for a professional to troubleshoot the power supply. If you want to repair it yourself make sure that you have necessary tools and test instrument. First check bad solder joints(re-solder all cold solder), leaky electrolytic capacitor(sometimes it has bulged at the top but not all, you better have a capacitor checker), open/shorted regulator transistor/IC(mounted in heat sink), open fusible resistor (caused by shorted regulator Transistor/IC), shorted zener diode.

You may also replace the entire power supply board, click this LINK.

Hope I helped you.

Thanks for using fixya.


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