Hi, guys this is my first thread here and I hope you can help me out.
I have this HITACHI P50TP01E that had no picture just a blue light blinking 4 times. I read online that it was a power supply problem (later when reading the service manual I found out that it could a lot more than just the PS), so I changed some caps on it, they weren't bad, but more than 6 years old. This did not improve my issue. After reading some threads (tom66's guide for fixing plasmas was of most help, so thank you for the great guide), I found out that unpluging one of the Y-buffers could start the tv if one of them is the problem. So after removing the lower one, nothing. But after removing the other one the tv would start with no blinking lights (and no picture, not even the part of the screen with the connected Y-buffer was working), just a solid blue light, as normaly. So I turned the TV on and off a few times and it was stil the same. I found that one of the chips on the removed board is fried. I wanted to check the Va and Vs so I turned the TV on again after ~1 hour and there was picture in the lower part of the screen, but is was just green snow and lines, and after ~1-2s I heard a pop and smoke was comming from the back of the tv. I turned it off and found another on the "working" board (it had no visble signs before the pop and the smoke). So I asked a friend who's been fixing TVs for the last 20 years about it and he told me to desolder the faulty chips and that's what I did. The tv worked but with green snow and lines, there were also white lines now. But when I turned it on I didn't conect the cables that were in front of the fried chips. I have a video of this. After conecting them the TV worked with no green lines or snow, but the white lines where still there (I guess it's because of the removed chips).
After 2-3 minutes of being turned on there was another pop and more smoke so I desoldered the newly burned chip. And after 10 minutes one more chip was fried, all of the chips fried by me are on the lower board. I tried touching the chips before the last time one of them failed and the weren't even very warm. So before ordering new boards I want to check the rest of the TV.
Can anyone tell me how to test the FETs on the Y-sus board? I can desolder them, but I don't know what voltage and where I should I apply it to see if the FETs work.
I'll post my pictures, videos and part numbers below. All of the pictures are after desoldering the chips I couldn't take a photo in the 2s I got the first time. xD
P.S. The Vs was 0.6v over the one marked on the sticker, but I lowered it a bit and it's 0.4v over the default one now.
nd60200-0047/8 - Y-Buffer
nd60200-0046 - Y-sus
https://www.youtube.com/watch?v=Va9j...ature=youtu.be
https://www.youtube.com/watch?v=GyTx...ature=youtu.be
Any help and sugestions are welcome!
I have this HITACHI P50TP01E that had no picture just a blue light blinking 4 times. I read online that it was a power supply problem (later when reading the service manual I found out that it could a lot more than just the PS), so I changed some caps on it, they weren't bad, but more than 6 years old. This did not improve my issue. After reading some threads (tom66's guide for fixing plasmas was of most help, so thank you for the great guide), I found out that unpluging one of the Y-buffers could start the tv if one of them is the problem. So after removing the lower one, nothing. But after removing the other one the tv would start with no blinking lights (and no picture, not even the part of the screen with the connected Y-buffer was working), just a solid blue light, as normaly. So I turned the TV on and off a few times and it was stil the same. I found that one of the chips on the removed board is fried. I wanted to check the Va and Vs so I turned the TV on again after ~1 hour and there was picture in the lower part of the screen, but is was just green snow and lines, and after ~1-2s I heard a pop and smoke was comming from the back of the tv. I turned it off and found another on the "working" board (it had no visble signs before the pop and the smoke). So I asked a friend who's been fixing TVs for the last 20 years about it and he told me to desolder the faulty chips and that's what I did. The tv worked but with green snow and lines, there were also white lines now. But when I turned it on I didn't conect the cables that were in front of the fried chips. I have a video of this. After conecting them the TV worked with no green lines or snow, but the white lines where still there (I guess it's because of the removed chips).
After 2-3 minutes of being turned on there was another pop and more smoke so I desoldered the newly burned chip. And after 10 minutes one more chip was fried, all of the chips fried by me are on the lower board. I tried touching the chips before the last time one of them failed and the weren't even very warm. So before ordering new boards I want to check the rest of the TV.
Can anyone tell me how to test the FETs on the Y-sus board? I can desolder them, but I don't know what voltage and where I should I apply it to see if the FETs work.
I'll post my pictures, videos and part numbers below. All of the pictures are after desoldering the chips I couldn't take a photo in the 2s I got the first time. xD
P.S. The Vs was 0.6v over the one marked on the sticker, but I lowered it a bit and it's 0.4v over the default one now.
nd60200-0047/8 - Y-Buffer
nd60200-0046 - Y-sus
https://www.youtube.com/watch?v=Va9j...ature=youtu.be
https://www.youtube.com/watch?v=GyTx...ature=youtu.be
Any help and sugestions are welcome!
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