did you look in your ASC tech notes ps3 pdf file ps 3 boards should give you the parts n umbers there for mouser or Digi key !

Alan

Yes, sadly those parts are not mentioned...

Thanks though!!

Chuck

I believe that these are the parts you are looking for both are out of stock at Mouser and  with a 41 week lead time like so many other chips.
FDD4141CT
FDD8447LCT

@Dennis S posted:

I believe that these are the parts you are looking for both are out of stock at Mouser and  with a 41 week lead time like so many other chips.
FDD4141CT
FDD8447LCT

From what I can tell, those two part numbers are both transistors (FET type).  While a transistor can be configured to be "just" a diode it would be unusual to designate it as a "D" rather than a "Q".  A photo of the parts in question might resolve this.

Sorry, they do not look anything like those parts

Here is a pic.

@Dennis S posted:

I believe that these are the parts you are looking for both are out of stock at Mouser and  with a 41 week lead time like so many other chips.
FDD4141CT
FDD8447LCT

Those are clearly the wrong part numbers.

If no assistance from mth documentation or repair gurus I suspect you could make an educated choice. Does the board work less one output function? Can you trace the output pin 3 (of the sot23 Q) to a harness pin?

My apologies, my error.

Guys, look at the pictures!  The required component is a tiny SOT23 package, you're proposing a huge power component in a DPAK package!

SOT23 Package

DPAK Package

Gee whiz. 

There has been more discussion about what I thought was clearly established as INCORRECT part numbers than anything of value to the OP.

Again, if MTH service docs or bulletins (which I do NOT have) do not provide the info, I believe you might effect a repair using some basic troubleshooting.  My guess is that SOT23 Q210 is in some  type of transistor/FET output circuit since the input (pin 1) has such a thin trace but pins 2 and 3 are fat traces.  It appears the output pin 3 goes to D207 which suggests it's a clamp and hence this is driving an inductive load (e.g., motor, coupler) or some off-board circuit since a wiring harness is also an inductive load.

If Q210 is indeed driving an off-board load, the idea is to then realize that there are not that many choices.  PS3 lighting is LED for lights so that really reduces the pool of suspects.  The power/voltage/current requirements for PS3 outputs would logically be the same as PS2 engines so the parameters should be known to pick a suitable Q and D.

My 2 cents.

I'm still of the mind to take one off a dead board, that way you know what you have is the correct part.  I haven't seen that particular part croak on any PS/3 board yet, so it's not like it's a common failure.

Thanks for all of the input guys!!

I agree, we should stop talking about what is not right and focus on what is correct.

Out of town til next Tuesday, then I will experiment with some parts I have for PS2 boards.

In any case are there ant dead boards around that we might scavenger a part or two from??

Thanks

It is part of the Smoke unit heat element control.  Why don't you look at another PS-3 diesel board and compare the number to some of the other similar components.  Might find that it is the same.

@Helichuck posted:

...I will experiment with some parts I have for PS2 boards.

.

If as GGG says Q210 is the smoke heater, note that the PS2 smoke heater transistor (FET) was in the larger SOT-223 (I think it was) package.  It would be a challenge to transplant that to a SOT-23 footprint.  But since the PS2 smoke heater FET has been discussed/repaired in multiple OGR threads, it would be a good clue as to what was needed spec-wise (Voltage, Current, etc.) albeit in the smaller SOT-23 package given the ~10 year improvement in component technology between PS2 and PS3.

I think George just stated that Q210 is in the smoke heater circuit, it's not the part that carries the current to the smoke resistors, that would be Q227, part # NTMS5835NLR2G.

Your Q227 part # is an SO-8 which would have more heat dissipation capability than a SOT-23.  I don't have a PS3 board to look at.  But I can't imagine there being two FETs needed for the smoke heater control.  If you're looking at a board what then is in Q210?

Well, the documentation that MTH supplied for PS/3 replaceable parts lists Q227 as the smoke FET.

Well, this is a pickle.  I don't know if there are any more credible sources than you and GGG.

Chuck's byline says MTH Authorized Service Center so I presume he has a PS3 test fixture.  I'm not an authorized anything and have no test fixture but I'd think that would be a good way to confirm that smoke heat is not working (?).

Could there be a later version of PS3 boards where they replaced the OBSOLETE part you mention? 

I doubt it, the tiny SOT23 package isn't one that I'd expect to be driving the smoke resistor.  I'm assuming that George was saying it was in the smoke control circuit, just not the actual power control part.  As far as obsolete parts, MTH seems to be able to pick these quite well, they might consider going with more mainstream packaging like D-PAK parts that there are plenty of substitutes for.

@gunrunnerjohn posted:

I doubt it, the tiny SOT23 package isn't one that I'd expect to be driving the smoke resistor...

I'm not sure I agree with that.  A quick search brought up this 50 cent (qty 1) N-FET.  It essentially has better specs than the SOT-223 PS2 smoke heater FET (the one marked "94055" as I showed earlier).  The smoke heater is not "that" onerous a chore.  If you have a 8 Ohm heater resistor (or two 16 Ohm heaters in parallel), and a PV DC voltage of, say, 24 Volts that's a peak FET current of 24V / 8 Ohms = 3 Amps.  This transistor can handle 8 Amps.  Of course the smoke heater current is nowhere near 3 Amps as that would be heater power of an unsustainable 3A x 3A x 8 Ohms = 72 Watts which would start a fire!  I'd think the maximum smoke heat power would be in the 10 Watt range in which case the smoke heater FET would be averaging around 1 to 1.5 Amps which is not at all hard to imagine in a SOT-23 package with modern FET technology.  IMHO.

I like GGG's idea of looking for another SOT-23 that might be marked the same...maybe for a coupler drive or whatever.  Otherwise if someone can read off the device code or mark of Q210 we might get lucky.  His is burnt/blistered so it's not clear it can be read.  For example, the SOT-23 of the above FET would be marked "8Y" per datasheet since SQ2318AES would not fit.

Stan, since the smoke FET is detailed in my ASC notes, and I've actually replaced one of those to restore the smoke heater function, I'll have to call you on this point.   I bought the NTMS5835LR2G parts before they became extinct, and I still have some of them in stock.

I don't doubt under the right circumstances the part you point out could carry the load, but in this case, it's not actually called on to do that.

OK, you saw my SOT23 and raised me a SOP8; I fold my hand.

I suppose the closest exit is to transfer parts from a dead PS3 board.  Oh well, the Q210/D207 mystery might remain just that...

@stan2004 posted:

OK, you saw my SOT23 and raised me a SOP8; I fold my hand.

I suppose the closest exit is to transfer parts from a dead PS3 board.  Oh well, the Q210/D207 mystery might remain just that...

That was my suggesting in the beginning.  I keep all my dead boards for exactly that kind of issue.  It's not like I can't find enough dead PS/3 boards!

I suppose you could take one off a dead board and characterize it, but that's more work.  Truthfully, just finding out what type of part it is might be enough.  Say it's an N-chan FET, just use one that has a reasonable rating and see how it goes.  I've found that usually there's a fairly wide variety of similar parts that will drop in and usually work fine.  It's pretty rare that a circuit is designed specifically for one exact set of part specifications.  Also, a vast majority of SOT23 parts have the same pinout, so it's easy to drop one in to see if you're right once you know what type of part it is.

But wait...there's more!

The top photo is what Chuck posted for his PS3 board.  Q210 sits right below D207.

The bottom photo was hijacked from this OGR thread where you participated in re a blown smoke heater FET Q227 on a PS3 board.  There is NO Q210 below what appears to be D207.  Note the "fat trace" running between D207 and Q227 on the lower board suggesting some form of intimate relationship.

To be sure, YOUR suggestion to simply replace parts from a donor board is nevertheless the closest exit.

Chuck when you re-join the discussion, perhaps post a further-back photo of the your board showing Q227 (if there is one!) and perhaps make note of any board markings indicating Revision, Version, date or what have you.

The thick plottens...

Stan, Q210 is simply not fitted to this board.  Here's the layout of the chips, notice the position of the three under discussion.  BTW, I took a smoked PS32 board from my dead pile and Q210 isn't fitted on it either.

Here's your board with Q210 marked, not it's simply not there.

Interesting.  So there are (at least) 2 versions of the PS3 board since Chuck's clearly has Q210 silk-screened and positioned right below D207.  In your board Q210 is not silk-screened and is below but to the right of D207.

Since pin 3 of your Q210 is tied to the output of Q227, this suggests a parallel connection perhaps allowing choice of SOT23 or the SOP8 device to carry the smoke heater current.  One could speculate all day long about the reason for this...maybe this board could be used in a small gauge engine with less heater power requirement and fitting Q210 instead of Q227 could save a few pennies?  Who knows.

I think much will be revealed if Chuck posts a wider view of his PS3 board.  Perhaps it will have an empty parking space for Q227!

Well, the PS32 board and the Rev D. and Rev E. versions of the PS/3 diesel board all have those parts in the same places.  They actually look almost like the same layout.

Rev. E Diesel PS/3

Rev. D Diesel PS/3

The mystery may be solved, I don't see Q227 on the Rev. B layout, that may be why Q210 is there, and also why it went up in smoke.

Rev. B Diesel PS/3

Wow, that's a lot of deep digging. 

Since Rev B has Q210 right below D207, it sure seems he has a Rev B...and presumably Rev B preceded D and E.  So the conundrum is to replace Q210 with another Q210 from a donor Rev B board if one can find one (and knowing it may fail again as before), find a beefier SOT23 than what exists, or figure how to "fit" a beefier N-FET of a larger package into the SOT23 footprint of Q210, or ???

Never a dull moment...

I'm guessing that's not the only time that FET went up in smoke, there has to be a reason the later versions of the board sport a much beefier FET for the smoke.

You guys kill me:-).  Yes board rev makes a difference, and these are not as simple as the PS-2 boards for what ever reason.   G