Deer DR-A300ATX so close to decent!

[eccerr0r]

Re: Deer DR-A300ATX so close to decent!

I hate things that are hard to seach for... I've seen some PSUs with "2003" on them and initially thought they were a ULN2003 which doesn't quite make too much sense in a SMPS... but then I found this:

http://www.eejournal.org/journal/201...tic-tl494-2003

(which is a blog that's of bcn quality)...

By that site it seems to imply the 2003 is not a tl494 but used similar to one...

Mystery...

[PeteS in CA]

Re: Deer DR-A300ATX so close to decent!

I wonder if the "2003" on the PWM is the vendor part number. A lot of other components have 02XX date codes, and elsewhere on the PWM is the characters "0225". But whether built in 2002 or 2003, this P/S has lasted a long time. If it has been in use for most of those 9 or 10 years I'd guess those bad caps are wear-out failures. Those heatsinks are impressive - when it comes to power and heatsinks, heavy metal is goodness! Uprating the 12V rectifier and possibly the switch transistors (got any stray 13007s or 13009s?), and replacing the bad caps might give your customer another 2 or 3 years' service from that computer.

[Per Hansson]

Re: Deer DR-A300ATX so close to decent!

1000:th post, congratz goodpsusearch!
With a name like that you know you just need to fix this PSU up, it deserves it

[ben7]

Re: Deer DR-A300ATX so close to decent!

Replace all the caps, and the 12v rectifier, and that will be a sweet PSU!

[tom66]

Re: Deer DR-A300ATX so close to decent!

Wow, Capxon not failed when every other cap did?
I'm impressed or surprised. Not sure which.

[TELVM]

Re: Deer DR-A300ATX so close to decent!

Here!

Thanks!

[goodpsusearch]

Re: Deer DR-A300ATX so close to decent!

5vsb caps are Capxon,
3.3V caps are Canicon(bulging),
5V caps are Junfu(bulging),
12V capacitor is G-Luxon.

[tom66]

Re: Deer DR-A300ATX so close to decent!

More likely, the caps died just from ripple current rather than minimum load resistor heat. Several of the bad caps are far enough from the resistors for it to make little difference. They are crappy caps; looks like CapXon for some of them?

[goodpsusearch]

Re: Deer DR-A300ATX so close to decent!

Very interesting, any pic with the location of the third MOV in parallel with both big caps please?

Here!

[TELVM]

Re: Deer DR-A300ATX so close to decent!

... There are 3 MOV, 1 in parallel to each primary cap and a big one in parallel of both! ...

Very interesting, any pic with the location of the third MOV in parallel with both big caps please?

[goodpsusearch]

The best Deer/L&C I have got so far. It has even MOV protection! There are 3 MOV, 1 in parallel to each primary cap and a big one in parallel of both!

There is also
2 X caps
5 Y caps
2 coils
NTC thermistor
RS405 bridge rectifier
impressive heatsinks
big primary transformer good for 300W+

Too bad that the primary caps are fake 470uF caps and their real capacity is 316uF.

The primary switching transistors are 2x C4106. These are even worse than 13007.... What were they thinking??

The PWM IC is chip of the year 2003.

The output filters are complete. There are no missing coils or caps. 5V and 3.3V each use 2x2200uF but the caps got cooked from minimum load resistors. The 12V output has 1 2200uF G-Luxon capacitor.

Let's check the secondary rectifiers. The 5V rectifier is SBL3040PT, the 3.3V rectifier is only 16A (SBL1640CT), so the label is 100% lying and the 12V rectifier is UF1002F, good for just 10A.

I could try replacing the 12V rectifier with something better, recap just the bad caps and put the psu back to the computer that it was powering for more than 7 years. The customer cannot afford buying a new power supply and this one is just not worth a full recap with Japanese caps.

The computer it came out is a Pentium 4 2.66MHZ, 512MB DDR, G-Force4 MX 128MB, 80GB IDE WD, DVD-ROM, DVD-RW, PCI Lan and a Winfast TV 2000 XP.