Chip of the year 2008

[Th3_uN1Qu3]

Re: Chip of the year 2008

Does this mean that the shunt is not a thick piece of wire, but actually a resistor?

Yes. Its value is too low for it to be measured on an ordinary meter. If it were any higher it would dissipate an inordinate amount of heat.

[370forlife]

Re: Chip of the year 2008

These particular shunts are current sensing shunts, they are what allow the unit to have OCP and actually have two separate 12v rails.

[shovenose]

Re: Chip of the year 2008

so i have a 2005 chip in one of my psus/ what does the year mean?

[everell]

Re: Chip of the year 2008

See the attached picture. I believe those are shunts.

Yes, there are two shunts, each measuring zero ohms. Each connects between the 12 source and either 12V1 or 12V2 output. Each output goes to an OPP pin on the 2008Z chip. The markings on the pc board show that a resistor should go where each shunt is located. Does this mean that the shunt is not a thick piece of wire, but actually a resistor?

[370forlife]

Re: Chip of the year 2008

Yup, Yang-Chun.

http://capacitor.web.fc2.com/y.html#yc

[ratdude747]

Re: Chip of the year 2008

yes. YC it is.

[everell]

Re: Chip of the year 2008

Here is the data on the capacitors removed from this power supply:

Brand marking capacitance DF ESR
YC? 2200/16 1.98 mF .089 .02
YC? 1000/16 926 uF .135 .03
YC? 2200/10 2.08 mF .102 .02
YC? 2200/10 2.07 mF .129 .02
YC? 2200/10 2.10 mF .103 .01
YC? 2200/10 2.04 mF .116 .02
YC? 1000/10 937 uF .109 .02
YC? 1000/10 936 uF .102 .02
YC? 47/50 41.7 uF .060 .42
YC? 4.7/50 4.35 uF .069 2.8
YC? 2.2/50 2.14 uF .051 3.7
YC? 1.0/50 .892 uF .052 5.6

Canicon 470/16 442 uF .096 .06
Canicon 10/50 9.27 uF .075 1.3
Canicon 2.2/50 2.26 uF .045 2.1

Koshin 22/50 21.1 uF .044 .39

I am not sure that I got the "YC?" brand correct. See the attached picture of the brand marking.

[370forlife]

Re: Chip of the year 2008

This unit does actually have 2 12v rails. It might be sensitive to having no load on 1 12v rail and even a light load on the other 12v. Also check the 5v and 3.3v and make sure they aren't getting up there too high due to a crossloading situation, especially when you have almost no load on them.

[shovenose]

Re: Chip of the year 2008

stick it in your pc to find out for sure!

[everell]

Re: Chip of the year 2008

Strange power supply. When I use one CD ROM as a load, the power supply works just fine. When I add one HDD as load, the lights on my tester just flicker, and the fan just does one quick spin.

Thought it might just be leaky main switchers, so replaced the D209L transistors with Fairchild 13009. Same results.

So I did a full recap. Same results.

I removed the output diode heat sink and diodes. All diodes measure OK. No shorts or leakers.

Looks like now I am going to have to get into some serious troubleshooting....and draw a schematic of that 2008Z chip.

[370forlife]

Re: Chip of the year 2008

Solytech sl-8460BTX. I had a very similar solytech built rosewill sl-8500BTX that used the same infineon chip to generate the 5vsb. It also had OCP, I believe the 2008Z supports OCP, there should be shunts around the 12v leads that would indicate OCP.

See the attached picture. I believe those are shunts.

[everell]

Re: Chip of the year 2008

The 2003 and 2005 chips (probably the same) are both 16 pin chips. This new 2008 chip has 20 pins, so it is a completely different animal.

I have a schematic of the 2003 chip. It is both pwm and supervisor in one chip. I would expect the same in this 2008 chip plus some other functions.

[kc8adu]

Re: Chip of the year 2008

deer.the erl and eel on the transformers give it away.

[Th3_uN1Qu3]

Re: Chip of the year 2008

I have 2 gutless wonders with the numbered like the year PWM ICs (2005) I believe were the ones on mine.

I was never able to find any info on the IC probably a custom manufactured part so the datasheets aren't public.

I've seen a datasheet for the ATX2005, i have to remember where i found it. Most of it is in chinese though. No luck with the 2008 however.

[momaka]

Re: Chip of the year 2008

Maybe 370forlife can tell me if it is a LC power supply.

It does look like it could be a Solytech (same manufacturer behind L&C, Deer, Allied, and a few other names). My reason behind this is because this PSU has YC caps, which Solytech does seem to use a lot. And also because of the PWM controller and that round sticker on the outside under the intake grille. I could be wrong, though, so let's see what 370forlife says.

By the way, if this does turn out to be a Solytech, check the resistance value of the loading resistors on the secondary side. Some of them are usually too low in resistance and they eventually cook the caps over time. See this thread:
https://www.badcaps.net/forum/showthread.php?t=11389

[Krankshaft]

Re: Chip of the year 2008

It's another no name piece of Chinese crap.

I have 2 gutless wonders with the numbered like the year PWM ICs (2005) I believe were the ones on mine.

I was never able to find any info on the IC probably a custom manufactured part so the datasheets aren't public.

Kind of like the custom Delta DNA1001 ICs on Xbox power supplies.

[goodpsusearch]

Re: Chip of the year 2008

I would not trust the caps. My Premier DR 400w had 2x330uF YC 200V caps but their true capacitance was only 220uF! As if it wasn't low enough...

[BigTroll]

Re: Chip of the year 2008

i really like that sleeving used on the cables, many would probably say its ugly but i happen to find it quite stylish.

[everell]

I have seen many LC/Allied/off brand "cheap" power supplies using the "chip of the year" 2003Z pwm/supervisory chip. Just got a MSI BTX 460 watt model MS-4460-010 power supply. Maybe 370forlife can tell me if it is a LC power supply. It seems to be an improvement in many areas:

Mains caps are 820 uF/200 volts (although a cheap brand, planet I think)
5vsb is NOT two transistor design but uses Infineon ICE3B0565 chip
Main switching transistors are two D209L
Main pwm/supervisory chip is the new "chip of the year" 2008Z (20 pin)
Two fans
Much better heat sinks

Has anyone seen tech data sheet or schematic of the 2008Z chip?

Still no APFC circuit, but I consider that a plus!