Re: Samsung ps50q97hd horizontal black lines
Thank you all, it was a pin connection. I measured between each connector and ground for the diode value and found some pins were O/C. Re-soldered those pins and it was all great.
Fool2cool
Member
Last Activity: 06-16-2023, 09:38 AM
Joined: 09-23-2012
Location: Hampshire, UK
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Samsung ps50q97hd horizontal black lines
Hi all,
Been fixing this Samsung and feel so close to the end now, it presented with the second buffer down on the top board as being blown and some FETs on the y main short, pretty much the common failure mode it sounds like.
I've repaired the Y main and replaced the blown buffer, i now have a picture but two horizontal lines across the screen, my question is, is there an easy way to know if it's just an unsoldered pin on my replacement buffer or if it's another buffer with issues, or is it the panel.
Cheers guys... -
Re: Panasonic TX-P42S11B - 7 Blink Code
Excellent news, so my first repair is quite a rare fault haha!Leave a comment:
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Re: Panasonic TX-P42S11B - 7 Blink Code
Thank you for the link Tom, is this a problem you've come across before?...Leave a comment:
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Re: Panasonic TX-P42S11B - 7 Blink Code
Haha should I take that as a compliment?
Yeah its very strange that the line just stops, and you can actually see a physical mark with the panel turned off. The data connector on the C1 board I think it is on the far right where the vertical line is also gets very hot, I think if I understand correctly these have a chip on flex? and the large metal bracket is a heatsink?
I've also re-seated the buffer connector a few times but it doesn't help.
Thank youLast edited by Fool2cool; 07-07-2013, 03:35 PM.Leave a comment:
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Re: Panasonic TX-P42S11B - 7 Blink Code
Hi all, I replaced the SD board and managed to get a picture up but I know seem to have a panel fault? There is a black horizontal stripe 1 pixel wide which stops just short of the right hand side of the screen and there appears to be an actual mark on the panel at that point when the panel is turned off, it looks like a tiny black fleck. There is also a red horizontal line that intersects the horizontal line where the mark is.
Pictures attached...Leave a comment:
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Re: Panasonic TX-P42S11B - 7 Blink Code
I'm talking from VF_GND to the ribbon connectors yes
Thank you for the quick replyLeave a comment:
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Re: Panasonic TX-P42S11B - 7 Blink Code
Hi all, I did some more reading and saw that I should be able to test the buffer boards for a short with a multimeter, I tested both buffer boards. The lower buffer board appears to have a partial short to floating ground on the 4th connector up on 3 pins, it isn't a dead short though, it measures about 4 ohms. Does this mean the lower buffer board is blown?
Thanks
CharlesLeave a comment:
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Re: Panasonic TX-P42S11B - 7 Blink Code
Yeah I get flashing green during startup then a solid green after a short while, I do worry I might of damaged something during fault finding, I'm all set up here to do surface mount rework the problem comes with tracking the fault down as always! Where could I check to see if I was generating a drive signal?
Does anyone have the service manual for this set? I found the service manual for TX-P42S10B but I don't know what the differences would be between the 10B and the 11B that I have.
Also can anyone explain why...Last edited by Fool2cool; 06-30-2013, 06:24 AM.Leave a comment:
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Re: Panasonic TX-P42S11B - 7 Blink Code
So the fact I get a solid green light with SC50 shorted would indicate that SC is possibly good and SU,SD are blown? But a shorted panel could of caused them to go?
Thank you for all your help so far!Leave a comment:
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Re: Panasonic TX-P42S11B - 7 Blink Code
Second time round with the 4 vf_gnd screws removed and SU and SD disconnected the SC board didn't so much buzz as more ring like a dial up modem finishing in a continuous buzz and a solid green light.
Thank youLeave a comment:
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Re: Panasonic TX-P42S11B - 7 Blink Code
Yeah I did consider that, but I'm also worried that the original fault wasn't the SC board, the fault history is that it fell off a stand and onto the floor, so I'm wondering if it could be something like a shorted panel? I don't want to shell out for an SC board if it does turn out to be that although I might have to.
Thank you for the quick reply and adviceLeave a comment:
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Panasonic TX-P42S11B - 7 Blink Code
Hi all, first real TV repair attempt for me!
I have this Panasonic plasma tv on my bench that had the 7 blink code problem, I disconnect the SU and SD boards and still had 7 blink codes, I disconnected the SC board and got 6 blink codes.
And now here's where I messed up big time, I read about testing SC by shorting the SC50 connector with SU and SD disconnected, however I failed to read the part about also removing the VF_GND screws. I promptly turned the TV on and a nice smell of burning greeted me from around the SC50 area.
Testing SC with SC50 shorted... -
Re: New Members - please post your introductions here
I'm not sure if I've left it too late to activate my account though as I can't seem to create a new thread in the troubleshooting forums, or does it take a while for my first post to activate my account?
Thanks...Leave a comment:
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Re: New Members - please post your introductions here
Hi all, I'm a trainee electronics technician who likes to try and repair electronics in his spare time as a hobby. Hoping I can learn some useful skills from this forum and also hopefully contribute in the near future!Leave a comment:
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