I repaired my power board today. I replaced the same caps. There's two of them. Mine said Shin Shin P224K 400. Same thing. They are C523 and C524 located between the VS transformer and the two big power transistors. They are both inline before the VS transformer so being damaged, they have lowered the voltage to VS.
After replacing the caps, I got full power back to my PS. The only power that was affected was the VS which is suppose to be around 90v. It was only 68v. My black screen came back on. I think the value of the caps is either .022uf or .0022uf. I'm thinking more the .022uf. I don't think it is even .00022uf mentioned above.
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Nothing lights on the tv at all? Even the LED power indicator? Might have taken a power surge/hit. Chances are it popped a capacitor on the power supply or logic board. Nothing short of a actual electronics or tv repqair shop is going to help you unfortunateley. Unless you know how to look at circuit boards and are comfortable taking apart the tv while unplugged of course) but be careful becase the power supply can still carry a lethal charge on it if you are not careful. If you know somone who knows circuitboards and can solder and unsolder then you might get licky if it's a capacitor or a resistor. If it's a IC chip though you are going to have to buy a board or a powersupply. So again you really need to find a local tv repair shop.
Porblem solved, It's a wonderful day.... Ahhhh, it is now FIXED and working great. I found cracked solder joints on a few of the switching power transistors and some of the big diodes and other heat producing parts. Also notice that the infamous Red caps C524 and C523 were discolored but they checked OK on my cap meter and also my ohm meter, however while I was inside the set after removing 1 million scews I decided to replace them anyway. I hope that my repair success helps someone. electricitym
I had the same problem. My nephew gave me this set after it quit working at the Gym where his wife was working. They were going to junk it but I asked if I could try and fix it.
The capacitor C2250 was definately blown and easy to spot so I did some searching and found a replacement from an online electronics supplier that didn't require me to buy 200+ as Digitech wanted. Anyway I replaced the Cap and it still didn't work so I started looking and testing components again and found that the Diode D2250 was bad so replaced it as well and now the set works fine. Maybe this is what is wrong with your's and others as well.
It made sense for me to check the diode as it is right next to the cap that blew. https://www.mouser.com for the Cap and http://www.slelectronics.net/ for the Diode.
The specs for the Cap/ CERAMIC CAP. B K 1500pF/1KV
The specs for the Diode/ SCHOTTKY BARRIER DIODE YG123S15
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
The Power Supply Board is listed below. Please note, there are 2 models with the same beginning number (PDP4294). Verify your model number before selecting the Power Supply Board as each board is different depending on the model number.
Here is my board that i ordered for replacement, as you can see, the top left second in --cap IS BLOWN. so i think i can either, use a cap from my other board into this and see if it works, or.....test out my current board, and use this board for parts. any suggestions, that be great. As far as,... which diode.. maybe this can help. cheers.-- Goat