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 03-04-2020, 03:21 PM   #1
AndreStarTrek
Member
 
Join Date: Oct 2017
City & State: Zuidholland
My Country: Nederland
I'm a: Knowledge Seeker
Posts: 20
Default Are this caps something special?

I been repairing special mainboard for a exposure machine but after replacing a chip and some cleaning it seems not to boot correctly so seen the machine is about 25 years, I have replaced all the caps with cheap chinees caps because that was something i have in stock. But after that there was no life at al. Been probing with a oscilloscope but noting.

So I been thinking, sure the cheap chinees caps are not the best but noting at all seems a bit strange. Are this something special?




AndreStarTrek is offline   Reply With Quote
Old 03-04-2020, 03:44 PM   #2
stj
Great Sage 齊天大聖
 
stj's Avatar
 
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,431
Default Re: Are this caps something special?

those are just regular - low-spec electrolytics.
i replace them all the time in sega gamegear consoles.

i would have replaced them with SMD tantalums
stj is offline   Reply With Quote
Old 03-10-2020, 10:56 AM   #3
AndreStarTrek
Member
 
Join Date: Oct 2017
City & State: Zuidholland
My Country: Nederland
I'm a: Knowledge Seeker
Posts: 20
Default Re: Are this caps something special?

Quote:
Originally Posted by stj View Post
those are just regular - low-spec electrolytics.
i replace them all the time in sega gamegear consoles.

i would have replaced them with SMD tantalums
Thanks, I take it using tantalum caps that capacity is not a big deal, if I at least meet the minimum requirements?

Last edited by AndreStarTrek; 03-10-2020 at 10:57 AM..
AndreStarTrek is offline   Reply With Quote
Old 03-10-2020, 12:27 PM   #4
stj
Great Sage 齊天大聖
 
stj's Avatar
 
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,431
Default Re: Are this caps something special?

tantalums are better and probably smaller
stj is offline   Reply With Quote
Old 03-11-2020, 05:44 PM   #5
AndreStarTrek
Member
 
Join Date: Oct 2017
City & State: Zuidholland
My Country: Nederland
I'm a: Knowledge Seeker
Posts: 20
Default Re: Are this caps something special?

Quote:
Originally Posted by stj View Post
tantalums are better and probably smaller
I understand that, but that was not what I was asking I like to know if it could be a problem if i use tantalums, would it be a problem if the capacity are bigger that the normal caps that are on the board right now?

I dont think it would, but want to be sure.

Last edited by AndreStarTrek; 03-11-2020 at 05:45 PM..
AndreStarTrek is offline   Reply With Quote
Old 03-11-2020, 07:45 PM   #6
stj
Great Sage 齊天大聖
 
stj's Avatar
 
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,431
Default Re: Are this caps something special?

there is no problem as long as the voltage rating is atleast 1.5x what it is connected to and you dont put them in backwards!

company's like apple and sun etc used to cover the boards in tantalum caps - the only reason they stopped is cost.
stj is offline   Reply With Quote
Old 03-11-2020, 10:55 PM   #7
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: Are this caps something special?

Tantalum cap:
https://www.arrow.com/en/research-an...lum-capacitors
__________________
Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956

Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999

Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl

Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/

TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
budm is offline   Reply With Quote
Old 03-13-2020, 02:50 PM   #8
Hitto
Member
 
Hitto's Avatar
 
Join Date: Apr 2019
City & State: Italy
My Country: Italy
I'm a: Knowledge Seeker
Posts: 87
Default Re: Are this caps something special?

Just use 50V parts and you should be okay. Kemet produces 50V parts for both 10 and 33uF tantalums, search for T52X serie.

Use a Panasonic [email protected] SMD electrolytic, it should fit. EEE-HC serie.
Hitto is offline   Reply With Quote
Old 03-17-2020, 06:05 AM   #9
AndreStarTrek
Member
 
Join Date: Oct 2017
City & State: Zuidholland
My Country: Nederland
I'm a: Knowledge Seeker
Posts: 20
Default Re: Are this caps something special?

Thanks for all you reply's.
AndreStarTrek is offline   Reply With Quote
Old 08-29-2021, 02:31 PM   #10
AndreStarTrek
Member
 
Join Date: Oct 2017
City & State: Zuidholland
My Country: Nederland
I'm a: Knowledge Seeker
Posts: 20
Default Re: Are this caps something special?

After 1 1/2 year this caps still haunts me.

After replacing the caps with the tantalums caps did not fix the problem it even create a problem, i found that out just recently.

After a year trying to fix this board we finally got a other board that worked. But this board has a lot of leaking/defective caps. So I replace 1/3 with tantalums and after that it wont boot, so i replace them again with caps that are not dead from a other donor board and the system boot again, but with a catch. We have to boot twice and I think this is because of the high resistance in the cap.

So i bought a ESR meter and got to work and the 33uf 16v caps has a ESR of 4.2 ohm with a 100KHz meter, and what i could find oud that is pretty high.

So I been searching for the right replacements and this are the one I found that could be it with my logic:
33uf 16v : https://nl.mouser.com/ProductDetail/...ZkYnMMng%3D%3D
10uf 16v : https://nl.mouser.com/ProductDetail/...52BHR3OQ%3D%3D
1uf 50v : https://nl.mouser.com/ProductDetail/...0g3nTfyA%3D%3D

So could it be that the tantalums are to fast? Are this caps the right one to replace with? Also a big chance i go with the radial version because this caps are even a bit to wide. I cant find a direct replacement for this cap.

In the end I am a bit lost, are this caps something special, could the tantalums be to fast and what should i replace it with? I hope someone could help me out.
AndreStarTrek is offline   Reply With Quote
Old 08-30-2021, 07:51 AM   #11
mockingbird
Badcaps Veteran
 
mockingbird's Avatar
 
Join Date: Dec 2008
Posts: 5,340
Default Re: Are this caps something special?

Quote:
Originally Posted by AndreStarTrek View Post
So could it be that the tantalums are to fast? Are this caps the right one to replace with? Also a big chance i go with the radial version because this caps are even a bit to wide. I cant find a direct replacement for this cap.
I doubt it.. It could be you butchering the traces on the board with the iron... If those capacitors leakes, they may have weakened the traces or pads.

The caps you linked to are fine... I would probably use something like Panasonic FT, it has a higher endurance, and the last item you linked to is out of stock.
__________________
"...I suppose he wants to be free of youthful associations, as most of us do."
-Robertson Davies

"...don't say oh my god, your god is far away from you. I give you massage. I am your god now."
-Luo Dong
mockingbird is offline   Reply With Quote
Old 08-30-2021, 08:22 AM   #12
stj
Great Sage 齊天大聖
 
stj's Avatar
 
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,431
Default Re: Are this caps something special?

check for electrolyte damage near the caps - those old boxed ones dump a surprising amount of liquid out!
stj is offline   Reply With Quote
Old 08-30-2021, 02:57 PM   #13
AndreStarTrek
Member
 
Join Date: Oct 2017
City & State: Zuidholland
My Country: Nederland
I'm a: Knowledge Seeker
Posts: 20
Default Re: Are this caps something special?

Quote:
Originally Posted by mockingbird View Post
I doubt it.. It could be you butchering the traces on the board with the iron... If those capacitors leakes, they may have weakened the traces or pads.

The caps you linked to are fine... I would probably use something like Panasonic FT, it has a higher endurance, and the last item you linked to is out of stock.
Quote:
Originally Posted by stj View Post
check for electrolyte damage near the caps - those old boxed ones dump a surprising amount of liquid out!
I am pretty sure the traces are fine. The solder points are a bit dirty but no leakes on the board. It helps that the caps hanging upside down on the board. I am also pretty sure there is no damage from soldering as I made sure i heat the pads as shortly as possible.

I wil take a look at the Panasonic FT caps but dont think the higher endurance is necessary, the setup only have to work for a few years.

Both thanks for the info
AndreStarTrek is offline   Reply With Quote
Old 10-23-2021, 06:13 AM   #14
sam_sam_sam
Badcaps Veteran
 
Join Date: Jul 2011
City & State: Some times Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 3,475
Default Re: Are this caps something special?

Quote:
Originally Posted by AndreStarTrek View Post
I think this is because of the high resistance in the cap.

So i bought a ESR meter and got to work and the 33uf 16v caps has a ESR of 4.2 ohm with a 100KHz meter, and what i could find oud that is pretty high.
You would be correct that this value would be very high depending on what series you have it could range from 0.39 to around 1.something

The brand name that I use that are [email protected] volts read 0.39 new
__________________
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *


These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board

All of these had CAPs POOF
All of the mosfet that are taken out by bad caps

Last edited by sam_sam_sam; 10-23-2021 at 06:16 AM..
sam_sam_sam 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 04:02 PM.
Did you find this forum helpful?