Re: Samsung 50" Plasma No Video
Ah Ha. I may have a culprit. So in testing the connection between the X main and Y main I've found the following.
On the Y Main; All 3 ground pins come back as 0L so i'm pretty sure that is not good. And of the 5 pins marked ERC two come back as 0.0 where the others give a positive reading.
DaveStar
Member
Last Activity: 05-01-2013, 07:50 AM
Joined: 03-25-2013
Location: Dallas, TX
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Re: Samsung 50" Plasma No Video
I think my X main is good so my next step is going to be to pull the new Y-main and compare it to the old board.Leave a comment:
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Re: Samsung 50" Plasma No Video
When I compared this ribbon connector new board comes back with positive readings old board with 0.0 for all pins...Leave a comment:
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Re: Samsung 50" Plasma No Video
Alright, I'm not sure exactly what you want me to check but I've been doing some comparison readings and hopefully this will make sense.
I tested these pins against a ground and all the readings came back positive on the new board and pins 1 2 & 3 were 0.0 on the old board so I believe that is all in order....Leave a comment:
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Re: Samsung 50" Plasma No Video
I count 3 of the 8 boards on this thing that I haven't changed out. Control Main, and a long skinny one that runs along the whole bottom and on behind the control main that connects to the X main....Leave a comment:
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Re: Samsung 50" Plasma No Video
With no X main Vsc comes it -192.2, right where it should be.
I have 3 X mains right now, oem, 1st refurb and 2nd refurb. When comparing the 3; ground to Ve all .0L Ground to adapter pins the same on both the refurb boards (.7 or .8) and 0.0 on the oem board. So I think the first board I suspected of being bad was not actually bad but it is nice to have it for comparison right now.Leave a comment:
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Re: Samsung 50" Plasma No Video
Ground to Ve is .0L so over limit
All the adapter pins came in around .7 to .8
I went ahead and installed the board. Vsc is ranging between -4 to -40 volts (should be -193) and Ve starts at 0 and slowly climbs a few mv the longer I hold it on there (should be 89).
I'm curious as to whether their is a problem with my Y-Main now. Perhaps I shorted the replacement one at some point during all this.Leave a comment:
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Re: Samsung 50" Plasma No Video
Alright.. New refrurb board just came in and before I put it in I wanted to test the same points you had me test on the old board.
Looks like I'm getting a good reading between the ground and the adapter pin, but ground to Ve is showing overload.
Any thoughts before I install the new board?Leave a comment:
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Re: Samsung 50" Plasma No Video
Right on, I'll try and send this board back. Do you have any thoughts on buying a refurbished board (this one was) vs a new board?Leave a comment:
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Re: Samsung 50" Plasma No Video
Yes for both, and on both the old and new board. When the old X main is hooked up I get no boot up at all. With no X main the Vsc reading on the Y main is good at -193. When I plug in the new X main both the Ve and the Vsc reading jump up and down but never close to where they should be.Leave a comment:
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Re: Samsung 50" Plasma No Video
I have a cheap multi-meter so I can't set the range, but it is .0LLeave a comment:
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Re: Samsung 50" Plasma No Video
These are a little better....Leave a comment:
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Re: Samsung 50" Plasma No Video
There is no visible damage to any of the boards. Though all the replacement boards are refurbished....Leave a comment:
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Re: Samsung 50" Plasma No Video
I really think it is my X main because without the X main plugged in everything checks out OK. With the old X main I get no voltage on Va Vs Vsc or Ve. With the new one, Vs and Va are good but Vsc and Ve are all over the place. Is it possible this 2nd X main board is also bad? Or is it my main control board? That's about the only one I haven't changed out.Leave a comment:
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Samsung 50" Plasma No Video
Its a PN50B450B1DXZA
So here's the rundown of what I've done and where I stand.
Started with no video and no red LED up front but you could here the SMPS clicking. All voltages (PS and Stby are good) as well as Va and Vs. So I assume its not the SMPS.
Disconnected the Logic Board. Would power on and make startup sound but still no video.
Replaced the Logic Board. Same issue.
Vsc voltage on Y main was not good.
Replaced the Y main and Y buffer. Vsc voltage now good but same issue.
Disconnected...
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