Question about Samsung HP-R5072 50 in. Plasma HDTV

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Tiny/Samsung PS42D8 Plasma

Hi.

Have been working on the above Plasma. Sound no screen problem. I found on the main supply board that the 2 power MOSNFET's (2SK2372)were both short and the associated 5A wickman had gone open. I replaced the MOSNFET's with IRFPC50. I also needed to resolder many dry jointed components which I have presumed were the cause of the fault. Powered up the Tv and got the same problem. All the mentioned components I replaced have survived. Q. Should I replace the associated Power Correction IC - IR2109 or could the problem be the replacement MOSNFET's? Any ideas would be appreciated.

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I have the same problem with a samsung power board in a hyaundai TV. PSU Model B4K-50.

I think my 2SK2372's shorted due to the faulty orange / red capacitors between the two FETs C523 and C524 which have the markings on them P0.22K400 which I assume are 220nF 400V.
They had basically no storage capacity left in them.

I am about to order the new parts and see if this thing powers up!
These capacitors are SHINSHIN capacitors

Posted on Sep 24, 2010

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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.
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1. IF sound main fuse/s are good.
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5_17_2012_2_28_42_pm.jpg

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