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#1 |
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Join Date: Oct 2017
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![]() 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? ![]() ![]() ![]() ![]() |
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#2 |
Great Sage 齊天大聖
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![]() 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 |
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#3 |
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![]() 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.. |
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#4 |
Great Sage 齊天大聖
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![]() tantalums are better and probably smaller
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#5 |
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![]() I understand that, but that was not what I was asking
![]() I dont think it would, but want to be sure. Last edited by AndreStarTrek; 03-11-2020 at 05:45 PM.. |
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#6 |
Great Sage 齊天大聖
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![]() 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. |
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#7 |
Badcaps Veteran
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![]() Tantalum cap:
https://www.arrow.com/en/research-an...lum-capacitors
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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 |
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#8 |
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![]() 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. ![]() |
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#9 |
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![]() Thanks for all you reply's.
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#10 |
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![]() 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. |
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#11 | |
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![]() Quote:
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.
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#12 |
Great Sage 齊天大聖
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![]() check for electrolyte damage near the caps - those old boxed ones dump a surprising amount of liquid out!
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#13 | ||
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![]() Quote:
Quote:
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 ![]() |
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#14 | |
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![]() Quote:
The brand name that I use that are [email protected] volts read 0.39 new
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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 ![]() All of the mosfet that are taken out by bad caps ![]() Last edited by sam_sam_sam; 10-23-2021 at 06:16 AM.. |
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