Customer said if he keeps it on for a long time, turns it off, and later back on, it takes 10 minutes to get to proper brightness. Is this just a cap issue? I didn't have time to take it apart I was just there to drop a repaired laptop off
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Phillips 50PF7321D/37 Plasma slow reboot
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Phillips 50PF7321D/37 Plasma slow reboot
Cap Datasheet Depot: http://www.paullinebarger.net/DS/
^If you have datasheets not listed PM meTags: None
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Re: Phillips 50PF7321D/37 Plasma slow reboot
Here are the boards
LJ44-00125A Main
LK41-04084A Y
It takes an hour to get to screen (audio stays on during this time). Customer said used to take 30m and got longer.
I notice a few bloated on the Y board and like one on the main.
Refurbished pictures show those replaced, some at higher uf, but should I replace the main caps? Main and medium? Total recap?Cap Datasheet Depot: http://www.paullinebarger.net/DS/
^If you have datasheets not listed PM me
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Re: Phillips 50PF7321D/37 Plasma slow reboot
Keep in mind I've never been familiar with plasma before, especially any TV this old
Oh shit one of the bloated ones is under a Fet heatsink on the main. I'm going to have to unscrew all the fets, and unsolder the heatsink?Cap Datasheet Depot: http://www.paullinebarger.net/DS/
^If you have datasheets not listed PM me
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Re: Phillips 50PF7321D/37 Plasma slow reboot
Looks like you have a couple more caps bulging out that need replaced.Last edited by nomoresonys; 03-05-2022, 08:08 AM.
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Re: Phillips 50PF7321D/37 Plasma slow reboot
Originally posted by nomoresonys View PostLooks like you have a couple more caps bulging out that need replaced.
Originally posted by nomoresonys View PostBeing a plasma and probably at least 10 years old, a total recap might be best policy.Cap Datasheet Depot: http://www.paullinebarger.net/DS/
^If you have datasheets not listed PM me
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Re: Phillips 50PF7321D/37 Plasma slow reboot
Originally posted by nomoresonys View PostI think i would just change the thru hole electrolytics, then give it a good long test.Cap Datasheet Depot: http://www.paullinebarger.net/DS/
^If you have datasheets not listed PM me
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Re: Phillips 50PF7321D/37 Plasma slow reboot
Welp I did a near 90% of the Y and power board, and it still does it.
It was heavily used for 15+ years, I think the screen has lost it's plasmaCap Datasheet Depot: http://www.paullinebarger.net/DS/
^If you have datasheets not listed PM me
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Re: Phillips 50PF7321D/37 Plasma slow reboot
damn, that's bad luck, I hate heavy old klunky plasma tvs, I know a lot of people say they're great, but I wonder what would be worse, if they were all in the landfill (because most don't bother to recycle) or just keep the electricity hogs going and use up the rest of the energy resources that are left. I can carry a 60 inch led tv with ease but I need two and a half men to deal with a plasma, lol. But the screens don't shatter every time you tap them, that's one good thing.
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Re: Phillips 50PF7321D/37 Plasma slow reboot
Yeah he told me it came up after about an hour. Maybe it's the Z board. But at this point fuck itCap Datasheet Depot: http://www.paullinebarger.net/DS/
^If you have datasheets not listed PM me
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Re: Phillips 50PF7321D/37 Plasma slow reboot
In that case I would desolder and measure the caps you have not replaced yet on a ESR and capacitance meter.
Because if you're anyway going to scrap it there is nothing to loose and you might just find that there is some other bad cap somewhere."The one who says it cannot be done should never interrupt the one who is doing it."
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Re: Phillips 50PF7321D/37 Plasma slow reboot
I'm probably going to wait for him to get a new TV some day because his money is scarce but he slowly saves up for non-critical stuff. For the time being it does work, I just told him to not turn it off, mute it at night lol
Is it possible for a plasma TV to...I don't know...burn through plasma? Loose usable plasma?
I don't have an ESR meter. It's not often these days I actual do cap replacement anymoreCap Datasheet Depot: http://www.paullinebarger.net/DS/
^If you have datasheets not listed PM me
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Re: Phillips 50PF7321D/37 Plasma slow reboot
Well a way to narrow it down would be to heat the boards one by one to around 50°C or so.
If heating one of them shortens the startup time significantly you know you found your culprit."The one who says it cannot be done should never interrupt the one who is doing it."
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Re: Phillips 50PF7321D/37 Plasma slow reboot
Originally posted by Per Hansson View PostWell a way to narrow it down would be to heat the boards one by one to around 50°C or so.
If heating one of them shortens the startup time significantly you know you found your culprit.Cap Datasheet Depot: http://www.paullinebarger.net/DS/
^If you have datasheets not listed PM me
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Re: Phillips 50PF7321D/37 Plasma slow reboot
The likely component would be a capacitor, but it can be any component really, or even a solder joint.
You might be able to narrow it down further by doing more localized heating of components and or areas of the board..."The one who says it cannot be done should never interrupt the one who is doing it."
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Cap Datasheet Depot: http://www.paullinebarger.net/DS/
^If you have datasheets not listed PM me
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Re: Phillips 50PF7321D/37 Plasma slow reboot
These generate secondary Y voltages, like VSCAN and whatever.
While it's trying to turn on, what voltages produced by the Y-SUS are present? If one of them is missing then it's easy to isolate, if all of them are present, try heating exclusively the main heatsinks idividually, that's the IPMs.
This board should generate two types of voltage, one of them is VSCAN, and the other is the equivalent to -VY, since this is a Samsung board I can't find any test points and only one of the trimpots is labeled(YRR).
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Re: Phillips 50PF7321D/37 Plasma slow reboot
I was never able to get leads on it.
I'll heat up that board when I get over there and see if it's the culpritCap Datasheet Depot: http://www.paullinebarger.net/DS/
^If you have datasheets not listed PM me
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