Badcaps.net Forum
Go Back   Badcaps Forums > General Topics > General Capacitor Questions & Issues
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 06-12-2022, 08:35 AM   #1
LeBeauLuc
New Member
 
Join Date: May 2021
City & State: Quebec
My Country: Canada
I'm a: Knowledge Seeker
Posts: 4
Default Identifying capacitor type (Laserdisc PSU)

Hi,

I am trying to figure out what type of capacitors those could be, the picture attached is coming from a laserdisc power supply from the late 90's. I have accessed to the service manual and it is lacking the info for the 20 capacitors and doesn't specify the type either. Looking at the value, those seems to match ceramic type, are those ceramic?
Attached Images
File Type: jpg CLD-V5000_PSU.jpg (801.6 KB, 39 views)
LeBeauLuc is offline   Reply With Quote
Old 06-12-2022, 10:34 AM   #2
eccerr0r
Solder Sloth
 
eccerr0r's Avatar
 
Join Date: Nov 2012
City & State: CO
My Country: USA
Line Voltage: 120VAC 60Hz
I'm a: Hobbyist Tech
Posts: 7,195
Default Re: Identifying capacitor type (Laserdisc PSU)

caps that look like that are usually polystyrene. If there are that many of them, they probably chose cheapest and other plastic caps will work just fine...


...though they usually don't fail...
eccerr0r is online now   Reply With Quote
Old 06-12-2022, 01:07 PM   #3
LeBeauLuc
New Member
 
Join Date: May 2021
City & State: Quebec
My Country: Canada
I'm a: Knowledge Seeker
Posts: 4
Default Re: Identifying capacitor type (Laserdisc PSU)

Quote:
Originally Posted by eccerr0r View Post
caps that look like that are usually polystyrene. If there are that many of them, they probably chose cheapest and other plastic caps will work just fine...


...though they usually don't fail...
Thank you very much for the info, eccerr0r.

Also, I wanted to know if it is normal that the one I circled red to look that dark compare to the one circled green, I am thinking that it might be toasted.
Attached Images
File Type: jpg CLD-V5000_PSU1.jpg (767.8 KB, 27 views)
LeBeauLuc is offline   Reply With Quote
Old 06-12-2022, 10:05 PM   #4
redwire
Badcaps Veteran
 
Join Date: Dec 2010
City & State: Alberta
My Country: Canada
Posts: 2,609
Default Re: Identifying capacitor type (Laserdisc PSU)

To me they look like polyester mylar film capacitors similar to Nichicon QXY. I would replace with Panasonic ECQB (although obsolete) or anything with the same lead spacing and ratings. Polystyrene is always tubular shaped and they don't look like that to me.

They should be yellow coloured, so the darker brown/red parts have been affected (cooked) by the nearby power resistors' heat. I would replace them.
redwire is offline   Reply With Quote
Old 06-13-2022, 12:06 PM   #5
PeteS in CA
Badcaps Veteran
 
PeteS in CA's Avatar
 
Join Date: Aug 2005
City & State: San Jose, CA
My Country: USA, Unsure of Planet
Line Voltage: 120VAC, 60Hz & 115VAC, 400Hz
I'm a: Professional Tech
Posts: 3,396
Default Re: Identifying capacitor type (Laserdisc PSU)

The brownish cap is between a heatsink and a power transformer, both sources of heat, and possibly impeding airflow or convection, and as redwire noted, there are two 1 watt resistors near the cap.

FWIW, the first picture has what I think is a Shindengen logo in the PCB silkscreen. Power supplies tend to have mostly polyester film capacitors, with some polypropylene parts in important places.
__________________
PeteS in CA

Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
****************************
To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
****************************
Anti-Covid-Vaxxer pig crap claim/prediction, Doctor: Heart Failure from mRNA Jabs "Will Kill Most People" | Principia Scientific Intl. ; Dr. Geert Vanden Bossche Warns COVID-19 Jab Injuries and Deaths Will Soon "Collapse Our Health System" (VIDEO) ; Fully Vaxxed May 2021; Since that time I've done 7 5Ks, 1 8K, 8 10Ks, and 4 half marathons
PeteS in CA is offline   Reply With Quote
Old 06-14-2022, 06:18 PM   #6
LeBeauLuc
New Member
 
Join Date: May 2021
City & State: Quebec
My Country: Canada
I'm a: Knowledge Seeker
Posts: 4
Default Re: Identifying capacitor type (Laserdisc PSU)

Thanks all for that valuable info, looking on the interwebs, they do appear to be polyester film capacitors, knowing that I will be able to replace the burned ones.
LeBeauLuc is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums 2003 - 2022
Powered by vBulletin ®
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 10:30 PM.
Did you find this forum helpful?