electronics, repairs, service manuals and datasheets discussion community for the repairs professionals and technicians
FAQSearchMembersGroupsRegisterProfilePM'sLogin/Out
Magnavox 50MF231D/37 Capacitors. Original or low ESR?

 
Post new topic   Reply to topic    Electronic equipment repair and service manual search discussion Forum Index -> Equipment Repairs
View previous topic :: View next topic  
Author Message
sbrose
Guest





PostPosted: Mon Mar 21, 2011 2:22 pm    Post subject: Magnavox 50MF231D/37 Capacitors. Original or low ESR? Reply with quote

too am repairing a 50MF231D/37. Like the post said, the 2 caps in the middle are bulged out. I ordered same type 10v 3300uf 105c (M) and the same but low ESR as I read that they produce less heat and are of higher performance. Neither is expensive. Is it a good idea to replace te caps with the 'orginal equipment' or is using the low ESR a better long term fix?
Back to top
minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Mon Mar 28, 2011 11:55 pm    Post subject: Reply with quote

Put in 16 or 25 volt capacitors not 10.
Back to top
View user's profile Send private message Send e-mail
torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Tue Mar 29, 2011 11:57 am    Post subject: Reply with quote

Do you know if the original capacitors also are low ESR? And do you know the purpose of those capacitors in the equipment?

Typically, you should use low ESR caps where they are subjected to high ripple currents of high frequency - for instance in switched mode power supplies, DCDC converters, horizontal deflection of CRT monitors and televisions, inverters for welding or motor drives. But in case of audio equipment, smoothing of voltage from linear power supplies etc, then low ESR is of no use.

Most capacitors that bulge when they fail are low-ESR (or, at least, the ripple currents are so large that low-ESR should have been used there).

If you find out that a capacitor gets hot in operation, then it probably has too high ESR for the application.

Remember that the cheapest low-ESR capacitors are in fact not much better than a good standard quality capacitor. The only difference is that the manufacturer has published a guaranteed value for the ESR of the low-ESR types, while the standard types only have a "typical" value stated.
A sign of a good low-ESR capacitor is that the ESR value is stated at 100 kHz, not 120 Hz as for the types intended for linear power supplies etc. You should study the datasheet from the capacitor manufacturer and not rely on the reseller's webshop, as the latter are often full of typos and misunderstandings.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Electronic equipment repair and service manual search discussion Forum Index -> Equipment Repairs All times are GMT
Page 1 of 1

 
Jump to:  
You can post new topics in this forum
You can reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Електроника София - Service Manuals Free Download - Prikachi - Service Diagrams

Free TV Schematics Download - HARDW.net - Pinout Master - Jabse Search - Jabse.InK  - Pulsator

Connector Pinout Forum - Новини - SnimkiOt.com - безплатен DNS - Whois разузнаване - Poblizo.com : пътешествия