Re: when did panasonic started using SMD electrolytic capacitors?
OK i guess i should explain why i asked. I just bought used panasonic s-VHS NV-HS1000 VCR that is in cosmetically so-so condition, but virtually brand new inside. I can find no SMD electrolytic caps and so far i looked in power supply, preamp, mainboard and TBC board. i did not look inside the YC and sub boards (hidden and covered). that particular VCR was made in 1996 for UK market. on the other hand, the more recent popular panasonic's AG-1980 (USA market) is full of defective SMD caps. both of them are K-mecha...
jack black
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Last Activity: 08-26-2015, 04:10 PM
Joined: 12-06-2010
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when did panasonic started using SMD electrolytic capacitors?
in their consumer products?
does anyone know?
thanks! -
Re: bad surface mount capacitors in vintage video gear?
i googled some more and found this: [url]http://console5.com/wiki/Converting_from_Surface_to_Leaded_Capacitors[/url]
Re: bad surface mount capacitors in ...]<br /> <br />Re: bad surface mount capacitors in vintage video gear?
i googled some more and found this: [url]http://console5.com/wiki/Converting_from_Surface_to_Leaded_Capacitors[/url]
Last edited by jack black; 08-20-2015, 04:59 PM.Leave a comment:
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Re: bad surface mount capacitors in vintage video gear?
thanks, i didn't know about the SMD electrolytics issues. personally i had only issues with larger electrolytics in PS or in PC MB....Leave a comment:
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Re: bad surface mount capacitors in vintage video gear?
Panasonic AG1980 - Full Repair Service
Replace Bad Caps + New caps in color board
Price: $325.00...Leave a comment:
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Re: bad surface mount capacitors in vintage video gear?
this info is from the [I]reconditioning[/I] people: [url]http://www.tgrantphoto.com/sales/index.php/content/about-replacement-smd-caps[/url]
does it make sense?Re: bad surface mount capacitors in vintage video gear?
this info is from the [I]reconditioning[/I] people: [url]http://www.tgrantphoto.com/sales/index.php/content/about-replacement-smd-caps[/url]
does it make sense?Re: bad surface mount capacitors in vintage video gear?
this info is from the [I]reconditioning[/I]Leave a comment:
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bad surface mount capacitors in vintage video gear?
i recently frequent a video forum that deals with video capture, editing, etc.
the admins/mods on that forum preach that old analog video gear has caps worn out from usage and one needs to replace ALL CAPS to fix the malfunctioning gear.
it's said that especially high end panasonic s-VHS VCRs need that treatment and the surface mount capacitors are the worst and first to fail. supposedly panasonic doesn't use their own quality components in their flagship equipment, but sources it from cheap suppliers.
i think this is a total BS and scam and they lie to steer... -
Re: do electrolite caps fail from disuse?
so, would it be wise to periodically plug in and turn on various electronic gear that is stored? say once a year?Leave a comment:
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do electrolite caps fail from disuse?
the reason i ask, the last recap job i did was in a VCR that worked fine 7 years ago and blew up immediately when plugged in after that hiatus. -
Re: cap exploded in a vintage VCR
i thought about why there were 2 caps in series. then i thought it's a safety issue in case one of them shorts. somehow the factory ignored it. the irony is the mode of failure was the opposite, loss of capacity and that produced quite dramatic effects, cap fireworks and busted components on the control board that i'm trying to fix. goggling for this shows a common problem in toshiba VCRs of that age. looks like the cap plague existed for a long time before the recent pandemic....Leave a comment:
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Re: cap exploded in a vintage VCR
i think i fixed it. replaced C812 with another good 100uF/25V and got 15.5V in the output. the old C812 worked, but with decreased capacity. every other component i checked was fine.Last edited by jack black; 07-20-2015, 06:41 AM.Leave a comment:
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Re: cap exploded in a vintage VCR
100/25. you think it should be 50V?...Leave a comment:
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Re: cap exploded in a vintage VCR
one more question. there is a piece of wire short (from the factory) in the place of C813. should i leave this in place or replace with a real cap?Leave a comment:
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Re: cap exploded in a vintage VCR
i measured the voltage. it goes from 28 to 32V in the few seconds before i disconnect power. no wonder the caps blow.
looks like i'll be replacing the strd1706 and the related caps.
i also noticed the board near d811, d813, and f803 is discolored, probably heat. could bad diodes cause the problem too or be faulty in addition?
i have to admit i don't understand how that power supply works at all....Leave a comment:
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Re: cap exploded in a vintage VCR
yeah, i pulled the power when i saw the glowing. i put a new 1000 uf cap and the same problem, the power supply is toast. weird, it worked fine last time i used it.
question, if i buy used toshiba vcr on ebay, will it have similar power supply? the reason i'm trying to save this one, some of my tapes are recorded on PAL camera and this is the only one that can play them.Last edited by jack black; 07-18-2015, 01:12 PM.Leave a comment:
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Re: cap exploded in a vintage VCR
what do you mean? i replaced the exploded cap and plugged the (disconnected from vcr) power supply in. the 1.6A fuse started glowing and another big cap (1000 uf/25V) got hot and swollen.
another bad cap or f....ed up power supply?
edit: power supply was not screwed to the metal cage when i tried. maybe that was a mistake....Last edited by jack black; 07-18-2015, 12:20 PM.Leave a comment:
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Re: cap exploded in a vintage VCR
you are good, i searched too and even was on the same website but downloaded another, corrupted rar. this zip was good and i found the cap C831, 47uF, 25V, and i actually have a spare one!
than you, thank you, thank you....Leave a comment:
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cap exploded in a vintage VCR
I procrastinated with transferring my old family recordings on DVD. finally i plugged in the circa 1993 multisystem VCR and heard a pop and saw a flame. the VCR was last used several years ago, could this be a factor?
A small electrolyte cap blew in the power supply. i have no idea what value and voltage. i searched the web for schematics and nothing showed up (toshiba V-880ms). what would you put in? -
Re: fixed TV by recaping Tivo, how is it possible?
i was wrong and tom66 was right. the problem did come back. for reason that is a mystery to me it took full 7 days for problem to reappear. it's not the wireless either.
i'll take the TV apart again and reattach the cables that go to the light engine. it that doesn't work, i'm buying a new TV.Leave a comment:
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Re: fixed TV by recaping Tivo, how is it possible?
here is the thing, tivo was always on and always connected to the TV via components and composite cables via audio receiver. maybe there was some high frequency oscillation generated by tivo's PS? the only thing that was moved was tivo (and it's wi-fi adapter), but not TV. i may need to experiment with the wi-fi adapter location in case that was the culprit for completeness.
it has been 5 days with no interference while the interference was happening daily numerous times prior to the tivo's surge...Leave a comment:
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