Power brick squeezes, low output voltages

[tom66]

Re: Power brick squeezes, low output voltages

Yes. Generally a perforation of holes are arranged in a grid or pattern in some way as opposed to a single hole.

[Behemot]

Re: Power brick squeezes, low output voltages

[tom66]

Re: Power brick squeezes, low output voltages

Looks like a hand grip to me...

[Behemot]

Re: Power brick squeezes, low output voltages

Oh, you're right after all. I'd swear I've seen light through it, must've been some reflection.

Anyway, notice that nowadays 120W+ adapters are being made in this size.

[tom66]

Re: Power brick squeezes, low output voltages

The original Xbox 360 adapter is about 50% bigger and has a 230W output. It does include a fan to keep it cool, and they seem reasonably reliable. I'd say above 120W you're hitting the limit for pure passive cooling. You need active cooling.

[ben7]

Re: Power brick squeezes, low output voltages

I said "perforations", doesn't it mean "holes through the material"?

Well, you got that one right

I have never seen an adapter, besides the xbox ones, have holes for cooling. It seems it would be easy to get metal bits, staples, paperclips, liquid, etc inside through the holes - that would be a shock and fire hazard! :O

[Elysarian]

Re: Power brick squeezes, low output voltages

At £60-70 a pop (new, before discount) we've never considered those PSU's to be worth the engineer time to repair...

The rule is usually: if it's worth less than 2 hours (charge to customer) then bin it as by the time you've spent the time disassembling and testing you're making no profit and often a loss on the deal.

[Behemot]

Re: Power brick squeezes, low output voltages

At £60-70 a pop (new, before discount) we've never considered those PSU's to be worth the engineer time to repair...

The rule is usually: if it's worth less than 2 hours (charge to customer) then bin it as by the time you've spent the time disassembling and testing you're making no profit and often a loss on the deal.

I am sorry?

Well, you got that one right

I have never seen an adapter, besides the xbox ones, have holes for cooling. It seems it would be easy to get metal bits, staples, paperclips, liquid, etc inside through the holes - that would be a shock and fire hazard! :O

I don't think in this case it should be a problem. You see the electronics inside is cased in this aluminium casing and everything from outisde world would have contact with this aluminium cover only. It may not be as resistant to liquids, but if you spill mug full of tea onto ordinary brick, you may as well short it (around the AC plug for example).

[Elysarian]

Re: Power brick squeezes, low output voltages

I was just commenting on the cost of replacement vs repair on the PSU brick...

As for it not having ventilation holes, I can only assume this is to enable it to comply as a class II device (double insulated) - if there were exposed metal parts it would have to comply to class I requirements which would mean the unit would have to be redesigned (to allow the heatsinks to be connected to mains earth) - in the application that this particular PSU is designed for, having a mains earth common to the chassis ground would be undesirable as it adds another possible path for an earth loop to form.

[Behemot]

Re: Power brick squeezes, low output voltages

This is not ordinary laptop brick, I found new starting at 90 USD without shipping and VAT. My price per hour is much less than that. I will increase the price as I will get more skilled ofc but still it will be some time before such bricks will be cheaper to get new than repair here

[Elysarian]

Re: Power brick squeezes, low output voltages

This is not ordinary laptop brick, I found new starting at 90 USD without shipping and VAT. My price per hour is much less than that. I will increase the price as I will get more skilled ofc but still it will be some time before such bricks will be cheaper to get new than repair here

I know it's not a laptop brick - it's the PSU for a Dedicated Micros Sprite CCTV DVR

I'm a CCTV engineer and deal with these units on a regular basis - they're cheaper where I am as DM are a UK-based company.

[momaka]

Re: Power brick squeezes, low output voltages

PW is general purpose.

No, Nichicon PW is low ESR.
You may argue it's entry level, but it's still low ESR. I use them, along with PM and PS for fixing the start-up caps in bricks like that. They use non-aqueous electrolyte and usually have much longer endurance over regular 105C general purpose caps. Panasonic FC is very good in this application too.

Also, as far as I know, Chemicon KME is a very old series that is discontinued now and replaced by KMG (hence, I'm not that surprised it failed in that adapter). Not that KMG would have been better in that spot, though.

[Behemot]

Re: Power brick squeezes, low output voltages

Sure, must have written it the other way around - VZ is GP, PW low-ESR. Btw, where are those posts??

[momaka]

Re: Power brick squeezes, low output voltages

Post #12, page 1 .

[eccerr0r]

Re: Power brick squeezes, low output voltages

Despite hard plastic being a decent thermal insulator, it does conduct some heat, otherwise I wouldn't get condensation on my hard plastic cups when I have an ice cold drink in it...

Styrofoam on the other hand is much better...

[Behemot]

Re: Power brick squeezes, low output voltages

Post #12, page 1 .

Oh, I thought it was on this side and somebody deleted it as OT