Re: Samsung Plasma S50HW-YB01 has sound but no picture. PSU OK but FETs don't turn o
I've got this same TV with the same problem - no picture! I hear the same light clicking sound from somewhere on the vertical board shown above.
I note that the temperatures of several of what I think are FET's on this board seem quite high, as show in the attached photos.
Any idea where to look next?
Thank you,
PLBrand...
plbrand
Member
Last Activity: 03-23-2020, 10:00 AM
Joined: 06-06-2016
Location: Minneapolis, Minnesota
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Re: Sceptre X405BV-FHD3HF02205 no power
Bought a replacement EEPROM from ShopJimmy, soldered it in and TV works perfectly.
Thank you guys for your help and guidance.
PaulLeave a comment:
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Re: Sceptre X405BV-FHD3HF02205 no power
Is it likely that the EEPROM on this board has failed? I notice the replacements are commonly available. Would this be worth a try?
Thanks again for all your help.
PaulLeave a comment:
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Re: Sceptre X405BV-FHD3HF02205 no power
Voltages do not change on BL-ON or PS-ON when the power switch is pushed on/off.
The part number for U1 (UA1) is:
TPA3110LD2
23Tg4
CO4L
The part number for the large chip U100 is:
MSD3391DS
A7MHA93ZB
1214D
Thanks again, if you guys are willing to continue to try, so am I!
PaulLeave a comment:
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Re: Sceptre X405BV-FHD3HF02205 no power
Connector 4 voltages are shown on the attached document. "BL-ON" voltage appears to be .20
Paul...Leave a comment:
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Re: Sceptre X405BV-FHD3HF02205 no power
My apologies, I didn't understand precisely what you were looking for. Hopefully the attached document provides the necessary info.
Dick, I don't see a board in my TV that looks like the one in your photo. If I'm missing something, please advise.
The TV failed progressively. Initially, if I unplugged it, waited a few minutes and tried again, it would sometimes come on and operate normally for as long as it remained on. The frequency of coming on after this re-boot increased quickly until it won't come on at all...Leave a comment:
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Re: Sceptre X405BV-FHD3HF02205 no power
Okay, I added the box printed on the PS board with the expected values in the individual boxes and my readings below. Hope this helps.
Paul...Leave a comment:
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Re: Sceptre X405BV-FHD3HF02205 no power
Okay, attached are connector pin voltages to ground for Conn 4, 3, 2 on the corner of the power supply board. The orientation is such that the edge of the board is toward the top.
Hope this helps!
Paul...Leave a comment:
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Re: Sceptre X405BV-FHD3HF02205 no power
That will have to wait 'til tomorrow. How should I measure these voltages?Leave a comment:
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Re: Sceptre X405BV-FHD3HF02205 no power
Well, I found time this afternoon, so here are the photos of the PS Board Top/Bottom, connectors, other boards and entire back of TV. I hope they are adequate, please let me know if you need more.
Thanks again,
Paul...Leave a comment:
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Re: Sceptre X405BV-FHD3HF02205 no power
Thanks very much for the prompt response. I won't be able to take the photos until tomorrow, but will post them as soon as I can.
Again, thank you for your help.
PaulLeave a comment:
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Re: Sceptre X405BV-FHD3HF02205 no power
Hey guys, I have this exact Sceptre X405BV-FHD3HF02205 TV with the exact same boards. In my case, the red standby light comes on when the unit is plugged in, but nothing else. No picture, no sound, no blue light. The standby light does not change when the remote or the side panel power button are pushed. The diodes, including D10 seem good as they read normal with my DMM and none are shorted. A careful study of the caps doesn't show any obviously failed caps. I unplugged and replugged every connector on all the boards - but no joy.
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