Hi-temp electrolytics

[scottz29]

I'm putting together a cap listing for a monitor I'm going to be shotgunning (since no cap kit exists), and someone mentioned 105 degree caps.

Although the hi-temp caps aren't "that" much more expensive, I'm wondering:

• what the difference is from a general purpose 85 degree cap
• why a hi-temp might be required
• what would happen if i were to replace a hi-temp with a general purpose cap
• and if this happens again, how to identify one on a board/schematic so I can replace it with a suitable part.

thanks guys...

 

[Dokert]

There is no need for high temp caps. In theory they will last longer because they are not going to get stressed like the lower temp caps. I highly doubt that any of your original caps are high temp to begin with, so there shouldn't be a problem there.

Laymans terms...high temp caps are better quality.

 

[KenLayton]

Casinos will use the 105 degree (high temp) capacitors in the slot machine monitors and game power supplies. Those machines are on 24/7 so in those applications installing high temp caps makes sense.

 

[channelmanic]

Make sure you measure the caps coming out of the circuit. There are different sizes of caps available and a larger size might not fit on the board properly.

RJ

 

[Dokert]

Casinos will use the 105 degree (high temp) capacitors in the slot machine monitors and game power supplies. Those machines are on 24/7 so in those applications installing high temp caps makes sense.

I agree with using them in an application like that. Funny thing about our local casinos, they don't pay jack shit for video techs. Kids working at McDonalds get paid more. I looked into it for something to do, and there is no way in hell I am going to even turn my DMM on for the $9 an hr that they are willing to pay.

 

[ELutz]

Some modern monitors do call for high temp caps in various circuits. The caps are labeled with 85 or 105....just replace with the same as you remove...

Edward

 

[KenLayton]

The casinos around here pay more than that, but they will only hire Indians to do monitor repairs.

 

[Dokert]

The casinos around here pay more than that, but they will only hire Indians to do monitor repairs.

In San Diego, the res pays roughly $26 to start.

Our res, doesn't discriminate. They will pay anybody that will work for that $9 wage.

 

[demogo]

In San Diego, the res pays roughly $26 to start.

Our res, doesn't discriminate. They will pay anybody that will work for that $9 wage.

LOL!

Does any of their equipment work?

 

[Dokert]

LOL!

Does any of their equipment work?

The lead tech position only pays $13.50.

I don't think they fix their shit, I think they just buy new stuff when they break down.

 

[saltbreez]

The lead tech position only pays $13.50.

I don't think they fix their shit, I think they just buy new stuff when they break down.

That's why my recycler gets these brand new VGA arcade monitors like the one you saw in my shop, Dave. It was labeled as 'touch screen N/F', I just removed and discarded the touch screen. I'm contemplating buying an 8liner CGA chassis for it. This thing has seen less than 5 hours run time.

Saltbreez

 

[splattergatz]

you can replace 85 degree capacitors with 105 degree caps, but you shouldnt replace 105 degree caps with a 85 degree ones or the capacitor will fail. the 105 degree capacitors are manufactured with better materials to withstand the higher operating temperatures. i was taught rule of thumb longevity of 85 degree caps are 7 years, 14 years for the 105 degree ones. i replace the 85 degree caps with 105's whenever i can. the cost is slightly higher but not that much.
capacitors dry out over the years and put stress on other components in the circuit causing them to fail. not good.

 

[Dokert]

you can replace 85 degree capacitors with 105 degree caps, but you shouldnt replace 105 degree caps with a 85 degree ones or the capacitor will fail. the 105 degree capacitors are manufactured with better materials to withstand the higher operating temperatures. i was taught rule of thumb longevity of 85 degree caps are 7 years, 14 years for the 105 degree ones. i replace the 85 degree caps with 105's whenever i can. the cost is slightly higher but not that much.
capacitors dry out over the years and put stress on other components in the circuit causing them to fail. not good.

SG: Do you know the difference between 85 degree caps and 105 degree caps? Seriously, besides the label what is different in them?

I suspect nothing, just like computer cpu's. The difference in computer cpu's is simply where they fail at during testing. If it fails at 3Ghz then it becomes a 2.8Ghz processor, and if it fails at 2.2Ghz it becomes a 2.0Ghz processor.

Don't be fooled into thinking a cap will last longer because it is rated at 105 degrees. In theory it may last longer, but it just tested out better than the one that got labeled 85 degrees.