Hello All,
Got my hands on a Macbook Air with a fair amount of liquid damage around the SMC.
First boot produced constant high fan, endless loading boot logo, and no trackpad / keyboard response even after SMC reset and PRAM reset with a usb keyboard. I was able to run ASD which showed 2 fan errors along with a Ts0P sensor failure. A little research revealed that Ts0P is the temperature sensor in the trackpad and will cause the fan to run high, which makes sense since the trackpad cable was one of the most corroded areas. Without a matching donor...
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2011 13" A1369 820-3023-A Liquid Damage
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Re: Samsung PN58B650S1F Power Board Clicks, No Picture
Thanks for clearing that up RJ. The new main board did the trick! Thanks to everyone for your advice and input, it’s much appreciated. The quality of this set is unbelievable, hard to believe it’s a decade old, I just might never leave my living room again......gotta love those plasmas!
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Re: Samsung PN58B650S1F Power Board Clicks, No Picture
So there seems to be no revision A boards available at the moment, I've been told that a revision D board is an acceptable substitute, but the BN97 number would not be identical. Will I be able to use this board?
[URL="https://m.ebay.com/itm/Samsung-BN94-02856D-Main-Board-subs-to-BN94-02856A-B-for-PN58B650S1FXZA/302645631718?hash=item467715dae6:g:FxAAAOSwcx5ZZm-M:sc:USPSPriority!10965!US!-1"]https://m.ebay.com/itm/Samsung-BN94-02856D-Main-Board-subs-to-BN94-02856A-B-for-PN58B650S1FXZA/302645631718?h
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Re: Samsung PN58B650S1F Power Board Clicks, No Picture
UPDATE:
I have now dubbed this project the “trail of fail”, although I did make some progress.
I was able to source the correct components for the Y board, once those pieces were in place I attempted the panel test again, and this time I was greeted with beautiful colors!
So I know the panel’s good now, and can assume that the sustain boards are functioning correctly. The original main board causes the power cycle, and the used ebay main board makes...Last edited by WHaThEFLuX; 09-13-2018, 01:47 AM.
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Re: Samsung PN58B650S1F Power Board Clicks, No Picture
It's also worth noting 3 things:
1. I went slightly "mad scientist" on the main board and removed the two EEPROM ics on the back and put them into a programmer(wasn't sure which one held the right information). One of them was a single line of code with ENG as a note, I'm assuming it's the language configuration. The other one was completely blank, I'm guessing this is the EEPROM that so commonly gets fried when the main board malfunctions.
2. I re-attempted the panel test in complete...Last edited by WHaThEFLuX; 08-28-2018, 11:17 AM.
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Re: Samsung PN58B650S1F Power Board Clicks, No Picture
Here's a video of the control board startup:
[URL="https://imgur.com/a/iIzmenR"]https://imgur.com/a/iIzmenR[/URL]
There's 5V going to the control board.
By VSON [B]signal[/B] I assume you mean voltage? If so it's 4.04V on the control board and the PSU.
Not sure how to compare the VSON - Vs/Va drop, could you elaborate on that procedure?Re: Samsung PN58B650S1F Power Board Clicks, No Picture
...Last edited by WHaThEFLuX; 08-28-2018, 11:16 AM.
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Samsung PN58B650S1F Power Board Clicks, No Picture
Just when I swore I'd never fix another TV, this monster plasma found it's way to my door. It's the classic power cycling, clicking relay, no picture kind of failure you guys love to figure out!
Threads for reference:
[URL="https://www.badcaps.net/forum/showthread.php?t=29327"]https://www.badcaps.net/forum/showthread.php?t=29327[/URL]
[URL="https://www.badcaps.net/forum/showthread.php?t=27535"]https://www.badcaps.net/forum/showthread.php?t=27535[/URL]
The curve ball with this set is that it could be anything, allow...Last edited by WHaThEFLuX; 08-25-2018, 05:52 PM.
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Re: Short to ground on display board, how to find the culprit?
I've had this same problem many times before and was never able to figure it out, no amount of cleaning will solve it. Whatever damage occurred causes false readings on most other components on the board, when removed they all test fine. The first component that made me realize this was the diode Z1, on the burnt board it reads in both directions while on a good one it does not.
Bud, this unit functions exactly the same as the honeywell in my other thread, but is a different brand and design:
...Last edited by WHaThEFLuX; 09-13-2017, 11:20 AM.
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Re: Short to ground on display board, how to find the culprit?
Here is how everything is connected.
In the last picture, the last pin on the right in the row of horizontal pins on the upper left of the board connects to JF1....Last edited by WHaThEFLuX; 09-12-2017, 10:23 PM.
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Re: Short to ground on display board, how to find the culprit?
Bud, I apologize for my naivety, in my experience when damage occurs to that extent it is usually due to a short to ground, especially with the ground plane being right there......
On the working board, many of the components read OL on the meter when tested between them and the ground plane. On this board, literally half of the components show continuity to ground, indicating something is seriously wrong.
My expertise is extremely limited, if you could offer a theory as to why that is happening...Last edited by WHaThEFLuX; 09-12-2017, 09:14 PM.
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Re: Short to ground on display board, how to find the culprit?
Not sure about the meter as it is a cheap one, I'm at work now but I will take a picture of the other side when I get home!
stj, how do you know there's a via in the crater? I've attempted to grind that spot out on other boards, it seems like there was copper there, not sure how I would figure out where it goes?
Thanks so much for all your help guys, I was about to give up on this but there might just be a way to repair it, I'm also not opposed to running jumper wires if need be.....
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Re: Short to ground on display board, how to find the culprit?
Your first assumption is absolutely correct.
When I say shorted to ground, I mean that when I beep test from the ground plane to most other components on the board, it beeps. On a functioning board, all of these components do put out an Ohm reading when tested, but don't beep. When power is connected to the board it just about catches on fire around that black crater by the ground, leading me to believe that there is a direct short to ground there.
I have many of these boards at my disposal,...
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Re: Short to ground on display board, how to find the culprit?
Thanks for the quick responses guys!
Bud, I found the shorted diode on the display board, replaced it, and now it's working correctly. I'm trying to determine what is shorting to ground on the board in the picture, and it seems to be everything, literally.
I'm afraid stj is probably right, and there is most certainly no way of obtaining a schematic for this board. Anything I can try to salvage this thing or is it not worth the effort? As an interesting side note, I've repaired the same model...Last edited by WHaThEFLuX; 09-12-2017, 09:54 AM.
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Short to gnd display board Honeywell Relay Module
Hello All,
Back at it again with another board issue.......
I unknowingly plugged a display module that had a shorted diode into this board, the result was a puff of smoke and the crater by the ground plane seen in the picture below. Having another board with the same issue, I began to test and remove components one by one with the hopes of figuring out what the shorted diode destroyed but haven't had any luck.
It seems that many components are shorted to ground as well after the initial incident, I'm not sure how else to diagnose this issue...
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