Re: Pioneer PRO-FHD1 Elite Plasma Monitor Start-Up Problem
I took some time to look very closely at the entire board with a magnifier, looking for cracks in the solder or printed circuit material. I did not find anything obvious, but I did re-heat and clean up a number of solder joints that looked like cold solder joints.
After re-installing the board, and powering-up, I saw a spark, so I powered off and have not yet pulled the board again to inspect it. I'm not giving up yet, but it's really time for professional help, I guess.
I fear the worst. ...
Phil Stasik
Member
Last Activity: 07-28-2023, 11:09 PM
Joined: 01-18-2023
Location: Merritt Island, FL
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Re: Pioneer PRO-FHD1 Elite Plasma Monitor Start-Up Problem
Thank you Iotas! That is a curious way to mount a component -- with a terminal just floating. Thanks for filling in a gap in my knowledge!
I do appreciate the help of everyone on this forum!Leave a comment:
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Re: Pioneer PRO-FHD1 Elite Plasma Monitor Start-Up Problem
Looking very closely at the soldering on this board reveals that most of the joints are not shiny, but rather buff, as cold solder joints look. The soldering that I've done so far looks brilliantly shiny compared to the factory work, and I'm no expert.
I also found a small component, that I'm guessing is an SMD Zener Diode that looks as if one of the terminals is (intentionally?) not soldered. I've attached 3 images. It looks weird, and it seems to be the only component of its type on this board.
...Leave a comment:
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Re: Pioneer PRO-FHD1 Elite Plasma Monitor Start-Up Problem
Thanks diff! There is one particular solder joint that I have been looking at with suspicion on the upper left corner of this board. It's a "snap in" pin on one of the big caps that I pulled, tested, re-installed, then pulled and replaced. That is rough on the board -- even with a gentle touch.
I really do appreciate your advice!
I'm going to pull the board again and give it another good look.
I did find a digital copy of the Pioneer Service Manual, and bought it, in...Leave a comment:
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Re: Pioneer PRO-FHD1 Elite Plasma Monitor Start-Up Problem
I thought that I should try to isolate the heating of my power supply board with a styrofoam cup as a heat dam, rather than the cardboard that i had used before. The results were curious. The start-up success dropped to about two starts, then one failure.
Previously, using cardboard to isolate heating, I was getting completely normal starting when I heated the upper left corner of the board. I'm now suspicious that the cardboard must have been leaking heat to a larger area than I had thought. Maybe the whole...Leave a comment:
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Re: Pioneer PRO-FHD1 Elite Plasma Monitor Start-Up Problem
Thank you for your keen observation, diff! Yes, those are small electrolytic caps! I did replace both of those guys on my second wave of cap replacement. Near them on the board, (and possibly affected by my heating experiment) are a resistor, two variable resistors (that they filled with globs of RTV), 5 diodes, and a transistor.
I'm thinking of replacing all of them (other than the variable resistors, which are assumedly pre-set).
Maybe that's overkill, but I've eliminated most of the other...Leave a comment:
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Re: Pioneer PRO-FHD1 Elite Plasma Monitor Start-Up Problem
I finally located replacement capacitors that are brand new (from DigiKey) that are from the original manufacturer (Nippon Chem Con).
Sadly, it didn't work. I didn't damage anything, either -- which is difficult with these big "snap-in" caps. They have to be wiggled out/wiggled in, with some force.
3 of the replacement caps are the same 450V, 270uF as the originals. The other 2 have the same 820uF as the originals, but are a bit physically larger and are 315V rather than the original...Leave a comment:
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Re: Pioneer PRO-FHD1 Elite Plasma Monitor Start-Up Problem
Thanks for asking! I've been offline, and seriously beaten down, with Covid.
Yes, I did isolate the suspected caps from all of the surrounding components with a cardboard baffle system that directed the hot air from the hair blower. I also repeated the tests over and over, with a good cool-off period between tests.
Really, I was kind of skeptical of this test to begin with, but the experiment has been repeatable, and it seems that others have had success, so it is duplicable.
...Leave a comment:
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Re: Pioneer PRO-FHD1 Elite Plasma Monitor Start-Up Problem
Thank you again Nomoresonys! [I]That is a great link[/I], and a very interesting article! I really appreciate that list of Cap manufacturers, with the focus on tiers of quality. I noticed that even though this power supply board is the only one (on this monitor) that Pioneer had subcontracted out to SanKen in Indonesia, that the Caps all seem to be made by Nippon Chemi-Con, a top-tier manufacturer.
Really, I do appreciate your help! Now it's time to do some informed shopping...Re: Pioneer PRO-FHD1 Elite PlasmaLeave a comment:
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Re: Pioneer PRO-FHD1 Elite Plasma Monitor Start-Up Problem
Thank You, Diif and Nomoresonys! Sincerely.
Yes, I'm now more confident that the problem is the two large caps in the upper left of the photo of my power supply board.
I'm a big fan of always buying local to support our dwindling electronics supply stores, but when they really don't have what I need, I've been very happy with DigiKey. Even they don't carry these caps. I should have thought to search EBay sooner. I'm not familiar with the vendor: "Golden O Electronics".
...Leave a comment:
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Re: Pioneer PRO-FHD1 Elite Plasma Monitor Start-Up Problem
For those who are interested in my work on the Pioneer PRO-FHD1 Plasma Monitor power supply board trouble shooting, I replaced an additional 11 Caps from the area of the board that responded when I heated it with a hair dryer. The two largest Caps in that area (280V, 820uF) I could not find locally or at DigiKey or anywhere else that I searched, so I tested them by charging/draining them using a 12V battery and they seemed to hold a charge, and drain with a 5W resistor. I soldered them back in. If you look above at the photo...Leave a comment:
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Re: Pioneer PRO-FHD1 Elite Plasma Monitor Start-Up Problem
So far, I've replaced 8 caps in the area of the power supply board that I was heating with the hair dryer. 6 of the 8 caps test within 20% of the labeled uF value. Two of the larger caps (1000uF and 2200uF) test out of limits ("OL") on my Klein MM450 multimeter. I'm guessing that it's my meter that is the issue there...
The monitor is still not turning on normally, but it is noticeably better. That is to say, it powers up every third time that it's switched on. There are 3 more obvious caps in the...Leave a comment:
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Re: Pioneer PRO-FHD1 Elite Plasma Monitor Start-Up Problem
IT WORKED!
I used a hair drier to heat the same small area of the Power Supply Board where I already replaced one very slightly bulged cap -- and the monitor started normally! Damn! I let it cool down, and it failed to start. I reheated the same are, and it started normally again. AMAZING! Repeated again, just to confirm.
When I asked my wife whether we could just leave her hair dryer by the monitor, next to the wall mount...she gave me the look. You know the look. That crossed arms "you've...Leave a comment:
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Re: Pioneer PRO-FHD1 Elite Plasma Monitor Start-Up Problem
Thank You Nomoresonys! I'll give that power supply board the hot air treatment and report back....Leave a comment:
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Re: Pioneer PRO-FHD1 Elite Plasma Monitor Start-Up Problem
It's interesting to see very little information on the Pioneer PROFHD1 anywhere. I can't find a specific Service Manual for this monitor, but lots of information for several other Pioneer Plasma TVs. Except for schematics, of course!
I'm not going to give up on this beautiful machine. When it's running, it's beautiful, and frankly, I like the clean, well laid-out design. This early Pioneer Plasma seems have excellent craftsmanship. It was trouble free for 16 years!
I did see a curious recommendation...Leave a comment:
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Re: Pioneer PRO-FHD1 Elite Plasma Monitor Start-Up Problem
From what I've been reading, this may be a protection fault, not necessarily a power supply fault. I'm going to continue searching all of the boards for obvious problems visually. Any ideas?Leave a comment:
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Pioneer PRO-FHD1 Elite Plasma Monitor Start-Up Problem
Pioneer Pro-FHD1 Elite. Failure to power on.
I'm new to this awesome forum, and have been reading like mad, but have not seen the answer to my challenge.
We bought this Panasonic plasma monitor 16 years ago and it has never been serviced, so all parts are original, and the unit has never malfunctioned -- until about a month ago. The system fails to power on. At first (a month ago) this happened rarely. We learned to unplug for a few minutes to drain the caps, then re-plug, and the monitor would start normally. Now, we plug-in, turn on the main power switch, and the... -
Re: New Members - please post your introductions here
This is such a cool forum! I have loved fixing things since I was a little kid -- let's say five decades or so. Over those years, I've learned that I love to learn new things, and I suspect that most of the folks on this forum are the same.
Since it's now 2023, that means that Topcat's baby is two decades old, and that is something for all of you to be very proud of!
The reason that I searched for, and found this forum is that I have been struggling to breath life back into an amazing Pioneer "PRO-FHD1...Leave a comment:
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