Samsung HPT5054X/XAA - No picture Sound ok Have all voltages from ps ok vsc & vsvoltages are Ok replace Y-main board still no picture sound ok. Need help.
It's not the x main. 90% of the time it's a y buffer that goes out. It's usually the top buffer. 3/4 of the time the buffer takes out the y main board too. You cannot just replace the y-main or buffer because it will just burn out the other within seconds. Also about 1/4 of the time it'll take out the top transformer on the power supply too. The solution? First disconnect the power to the y main board. turn on the television and check the voltages coming off of it. Careful it's high voltage 208V! Remember it's DC too. Then disconnect the buffers from the y main board. You can try powering the y-main up to see if the little LED lights up. This does not indicate it's working though but it'll tell you if it is possible to fix. The fixes for these boards is only for electronics guys. It usually involves replacing 1-3 capacitors and 1-4 FET's. Since a bad buffer can take out a good y main in seconds it's usually recommended that one replace all 3 boards at the same time. It's a $250 fix. How do I know all this? I've now repaired 5 of these televisions. I owned one and spent close to 600 repairing it. I bought misc parts and broken sets online for months before I had 2 different repair guys walk me through the process of repairing them. I had so much cash tied up in parts that I bought 3 more dead sets and repaired them to justify all my spending. I've never had an x board fail. I've had EVERY top buffer fail. I've had all but 1 y-mains fail. and 1 lower buffer fail. I've also had the y buffer fry it's top chip, blow a capacitor and FET on the y-main, and fry the top transformer on the power supply before my eyes. It only took 5 seconds. Replacement of the 3 y boards will almost always fix the sound but no picture problem. Hope this helps!
I have sound and no picture also. I had no blown fuses, but I checked the voltages from the powe supply, and all are fine except Ve. It says it should be 94 volts, but it is only 14v. Even when not plugged into the Z or Y mains. Could my power supply just be out, or do you think it was caused a Z, Y or Y buffer? Thanks
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Take a DMM put it in resistance mode to measure upto 1K Ohms and check the resistance across C5515, C5502, C5504, C5507 (LOW BOARD), Then check C5415, C5402, C5411, C5404 (UP BOARD). The defective board is the one that will have around 100 ohms or less across these capacitors.
I have the same problem with the same model. I've tried a new X-main and a new power supply and still have no picture. Maybe we should trade boards, my x-main for your y-main........ Check your PS-ON on your power supply and see what your voltage is when t.v. is plugged in but off and what it is when it is on. Let me know.
I sent my Y-Main in for service. They found that Q5304 was bad and replaced it. I was excited to test out the repaired board. After installing it I turned the t.v. on and had a snowy picture on the upper display for a split second before the Y-main went again. So, I agree that a bad upper or lower buffer will kill the Y-main in seconds. The million dollar question is how can I figure out if it is the upper or lower buffer??????
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I had the same issue. All of a suden, my tv would not turn On. When I turn on the TV, the turn On "Tune" would be played with blinking Blue LED, but then no picture.
Then I opened the TV and could a blown fuse on Y board. I replaced it and then turned it on. Now my power supply relay keeps clicking and does not stop.
eecho789,
Thanks for your suggestion. I am planning to change Y-Board along with both of my buffers. But you mentioned that its a $250 fix, but when I search for the parts, they come out to be $300+. Could you please share with us where do you get the part for this TV?
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