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**tiresias** · 07-09-2006, 04:24 PM

Re: What the hell is this?!

Originally posted by trodas

I did not want Enermax send me the spare parts (as electronic guy, I can solder them w/o troubles...) but I do need to know what these are. R52 is obviously resistor, but of what resistance? And Q300 is likely a transistor, but once again - witch one it is - so I can repair my PSU and again enjoy it. Please don't tell me that I can't get the information or something like that - just help me out. Thanks, Pavel.

About the resistor, are the markings totally unreadable? In that case, I think your safest bet would be to ask someone who has the enermax liberty to check on their PCB for you. I have two Enermax units here, both however older than yours, a EG-465AX-G-FM and a "Coolergiant" EG-485AX-W-VHB, I doubt the PCBs are in really comparable in that regard.

The component in your photo marked BS

- is that the missing Q300 (Q=NPN, PNP, FET, etc.) in question? I couldn't make it out from your post.

**kc8adu** · 07-09-2006, 04:25 PM

Re: What the hell is this?!

http://www.tkb-4u.com/code/smdcode/indexsmdcode.php
if you can clear the mushed over solder from the resistor you might be able to read it.
3 digit types read as follows
1st and second are the value.3rd is the number of zeroes that follow.

**Galvanized** · 07-09-2006, 07:50 PM

Re: What the hell is this?!

trodas, in an effort to be helpful, I PMed this thread to ENERMAXPM over at AnandTech. He is a product manager for Enermax in Taiwan and offers customer support. I asked that he register here or to just PM me the needed info. I will give it three days for an answer. Hope he responds. We have PMed in the past and he is quite helpful.

**arneson** · 07-09-2006, 08:46 PM

Re: What the hell is this?!

Using your multimeter you can measure that little tab on top, to each little nub on bottom, in both directions.
This will tell you npn or pnp, then assume its a general purpose device rated for voltages in that section and sub what you have that will fit.
That transister is 5 times as big as the microscopic devices I was looking at today. They are to small for any kind of markings.

**davmax** · 07-10-2006, 02:10 AM

Re: What the hell is this?!

Hi Trodas,

To help I have given the links to a junction FET (first link) and a NPN bipolar transistor.

FET

http://www.semiconductors.philips.com/acrobat_download/datasheets/BSR56_57_58_CNV_2.pdf

Bipolar

http://www.semiconductors.philips.com/acrobat_download/datasheets/PBSS4160T_2.pdf

How to test with an ohmmeter.

Make sure the positive lead of the test meter delivers a positive voltage.

Using top view of device as on data sheets.

Junction FET. Positive lead on the Gate. You should read a conducting diode at both Source and Drain. Reverse the leads and no conduction.
Bipolar NPN. Positive lead on Base. You should read a diode at the Emitter and no conduction at the Collector. Placing a negative lead on the Base, the diode conduction will now be at the Collector.
Bipolar PNP. This is the exact opposite to a NPN i.e start with the negative lead on the Base.
MOSFET. No conduction between Gate and Source or Drain.

If any of the above have conduction both ways at any of the internal diodes this will indicate a failed device.

The voltage rating of any replacement is a challenge. Use a 40-60V device, hopefully it is not required to be any higher.

**trodas** · 07-10-2006, 11:43 AM

Re: What the hell is this?!

tiresias - well, I got second same PSU as well, and the resistor R52 read as "102", with therefore mean 10 and two zeroes = 1k Ohm. Case closed, I think

The problem I see in the little mosfet...

Yep, "BS 59 t" is what I can read on it...

kc8adu - thanks, however I did not get much out of the link... however other czech guy does and he seems to think that the transistor in question is 2PB709AS Philips suxxka.

The BS markings determine the AS type and unlike the "BS" suggest, it is the best from the serie... I still not understand what is the "59" (maybe 59-th week made?) and what is with the "t", but a little experiment there with same/similar general purpose PNP transistor will help make my PSU kicking back again, I hope.
Given the too little informations we have I think that this 2PB709AS suxxka is the safest bet.
And thanks for clearing out for me these SMD resistors markings. Basicaly they are the very same as for the normal resistors, just not colors like 0 = black, 1 = brown, 2 = red, 3 = orange, 4 = yellow, 5 = green, 6 = blue, 7 = purple, 8 = gray, 9 = white (and silver = 10% and gold = 5% precision) but numbers. Thx.

Galvanized - sounds pretty great! Thanks for your efforts - a confirmation of our findings will be great. Yet my faith with Enermax support was shaken a little, when on 3 or 4th tries they did not answer me even back...

arneson - oh, great

You want make me feel better that I have a BIG transistor? You fail at that

I can't measure a thing on it. The back two legs are broken off and I did not seems to getting a contact there... Weird. davmax suggested to use magnifying glass and cut some of the PVC off to get contact, but I did not have any stable magnifying glass with light so we rather wait for the Galvanized support question - if we just did not stick with the 2PB709AS from Philips

**davmax** · 07-10-2006, 10:05 PM

Re: What the hell is this?!

Further to our chat. Your photo clearly shows metal contact available for testing the transistor. There is in fact no need to remove any plastic.

A Google search for: "BS59 transistor" reveals one possible source with 300 in stock. I still have no idea what it is.

**trodas** · 07-19-2006, 12:21 PM

Re: What the hell is this?!

Me neither, but I think that is safe to replace this thing with a BC859B one. It is also the same size - SOT23 - and similar specs, so...

That should work. Now just let me get it from digikey...

Galvanized - so, what do Enermax say? I won't hear from ya!

**trodas** · 08-05-2006, 01:50 PM

Re: What the hell is this?!

So, todays I get from local source a transistor, that should be equivalent to the BC859B one. On it's body is hardly readable E6B - no idea what this is, and not entierly sure if this is the right one... But by lack of any other chances - I give it a try.

Unfortunately, much to my dismay, the PSU still refusing to work. So, either this is a wrong replacement or there is something else damaged as well - for the SMD resistor R52 I used 1 kiloohm normal ones soldered in place...

Anyone got any ideas?

Galvanized, what do the Enermax say?

**Galvanized** · 08-08-2006, 09:33 AM

Re: What the hell is this?!

Trodas, I really did PM ENERMAXPM twice over at AnandTech dot com. No answer as of yet. I did read your post to me several days ago and it bothers me that ENERMAXPM shows no profile that would indicate when he was last logged on over there. I emailed Enermax.tw, asking if ENERMAXPM was for real and if he is...Please have him answer his PMs.

I'm not positive about this, but I've been told that CWT and Topower build for Enermax. So maybe Enermax can't provide what you seek.

**Galvanized** · 08-08-2006, 10:46 AM

Re: What the hell is this?!

Just for you trodas I phoned Enermax at http://www.enermaxusa.com/contact_mp.php

I spoke to Tom in tech support and he offered no help at the componet level.
He did give a contact in Taiwan that will forward what you offer. rebecca_ma@enermax.com.tw Give Rebecca all the info and maybe a link to this thread.

Note: Tom said he knew of no Enermax tech posting on forums. So I guess ENERMAXPM was a phony. I will bump his thread over there and say so.

**Galvanized** · 08-08-2006, 12:59 PM

Re: What the hell is this?!

Hey!! Since I last PMed ENERMAXPM over there he/she has dropped the PM option.
I let the mods over there know the member is an intelligent phony.

Sorry trodas.

Please let us know what happens with Rebecca.

**Super Nade** · 08-09-2006, 11:17 AM

Re: What the hell is this?!

Dude,

Why the hell do you have fakers claiming to be company reps? Is the business THAT cut-throat?

**999999999** · 09-27-2006, 03:11 PM

Re: What the hell is this?!

Using the tests Davmax suggested, I think you should super-glue the bottom of the transistor to a surface so it doesn't move around, then put needle tips on multimeter probes to do the tests. There is still some metal exposed, you will just have to be very exacting in putting those needle probes on the remaining metal broken off.

Or the other option is to try the other transistor type, IE - if what you had was NPN, try a PNP.

**Rainbow** · 09-27-2006, 03:24 PM

Re: What the hell is this?!

It might be even possible to solder it back - with enough skill, proper tools and some luck.

**VILE DISRUPTION** · 09-27-2006, 05:15 PM

Re: What the hell is this?!

or carefully solder some wire onto the thing and that to where it went.

**gonzo0815** · 09-27-2006, 07:27 PM

Re: What the hell is this?!

Or simply track down the circuitry, wich it belongs to. A fan monitoring ciruict isn`t that complicated. Try folowing the circuits and make a littel paint job.I think the rest should ne not that hard.

**gonzo0815** · 10-02-2006, 07:09 AM

Re: What the hell is this?!

Well, during troubleshooting a Coffeeautomat logic board, i have found a similar device wich is short. The markings are 3BS 05. From that that side i learned that it is an BC856B PNP transitor made by Infinion.
The Datasheet is availiable here.
There you will see the device markings too.

**trodas** · 02-06-2008, 10:20 AM

Re: What the hell is this?!

Hmmm, I just get a BC859B from http://www.mouser.com/ , but no joy. The PSU is again quickly switching off then switched on...

Ideas what to check and where are welcome.

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