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e-E-Flite Blade CP CX 400-3D > How to repair burned out Blade CX 4-in-1 controller
 
 
johndog35
Senior Heliman
Location: Kansas City, Kansas

I can E-mail you a copy in jpg or pdf for better view. It kind of looses something when I uploaded it to this site. Just PM me and let me know.

Landings are nothing more than controled crashes
10-12-2006 Over year old.
 
 
stickyfox
Key Veteran
Location: Troy, NY, US

Jetset: I guess I didn't notice this earlier, but I just got my first burned-out CX in the mail today and the transistor is not the same. If you're repairing a BCX, you need to order an IRF7313, not an IRF7413. It's actually two transistors in one package, and the pins are not paired the same way, so you can't bridge them in the manner we discussed earlier. Take a look at the circuit board when you've removed the old one and you should see how they're connected. I hope this doesn't cause any confusion.

-fox
10-12-2006 Over year old.
HOMEPAGE  
 
 
mike_flight
Heliman
Location: Troy, NY - USA

Thanks MMcGinnis for such a great tutorial on how to fix the CX 4-in-1 controller!

Last week I bought a CX and burned out my controller just by tipping the helicopter over onto the floor (it didn't even break anything). After reverse engineering the motor drive circuit, it was pretty clear to me that the output stage is woefully under-rated, not to mention there is absolutely no current-limitting circuitry whatsoever. IMHO, E-Flite either forgot to add a couple of 10-cent parts, or they wanted to generate an additional $50 - $100 of revenue immediately after each CX sale (I would like to think they were just a little forgetful).

Anyway, I came across a newer part made by International Rectifier that comes in the same package as the IRF7313, but which features about half the ON-RESISTANCE. The part number is IRF7907PbF which can also be purchased at www.digikey.com ($1.12 in quatities of ten. With the IRF7907PbF at 25C ambient temperature, both outputs can drive over 9 amps continuous current. I also ordered some 7A pico fuses (part number F2318-ND) to install in series with the motor. That should be large enough to sustain aggressive flying, yet it oughta blow if the rotor comes to a screaching halt with the brushes straddling across two windings).

I'll try to follow up when I receive the parts and test everything out.
10-22-2006 Over year old.
 
 
beefcake
Senior Heliman
Location: Racine,WI

Be careful all, I was using a newly repaird 4-in-1 and had it glitch pretty bad quite a few times... I have to double check the solder joints, but it is like the motor was momentarily shutting off, it would stall out (the motor, not the heli) then recover in a coupld of milliseconds. At least it's not interfering with the other channels...
10-23-2006 Over year old.
 
 
Gino CP
Key Veteran
Location: Philippines

Been having same prob. But on my new GWS PHA 300 3-in-1. I get used to it. But I stay above two feet just in case. So far hasn't occured on take off and landings.
10-23-2006 Over year old.
 
 
mike_flight
Heliman
Location: Troy, NY - USA

Just wanted to follow up from my previous post, and mention that I finally had a chance to install and test the IRF7907PbF, which is an improved version of the IRF7313. The IRF 7907PbF can also be purchased at www.digikey.com ($1.12 in quatities of ten). The part works great, and I have not experienced any glitches. Also, I accidently locked up the rotor for a brief moment and the part did not blow.
11-06-2006 Over year old.
 
 
patternrules
Heliman
Location: Nineveh, IN

3 & 1

I just got the mosfets from DIGIKEY and the ones on the 3&1 are IRF 7413 all on the side without the dot is on the same pad the other side I think could be a problem as a couple of places it burnt the board pretty bad so I may not have a good contact as it's still not working. Seems I read somewhere that there could be another part that could be burnt out also, is that right?
Thanks
Steve Maxwell
11-15-2006 Over year old.
 
 
stickyfox
Key Veteran
Location: Troy, NY, US

The freewheel diode can also go along with the FET, but it usually doesn't. There's one mounted next to each motor connector. D-K does not sell this part, but they do sell a substitute for it.

SS14-E3/61TGICT-ND 1A 40V Schottky diode

-fox
11-16-2006 Over year old.
HOMEPAGE  
 
 
MMcGinnis
Heliman
Location: Kansas City, Mo - USA

Pin soldering clarification

Attached is a photo that should clarify what I was trying to explain in my original tutorial on soldering the HEXFET pins of the 4-in-1. The row of pins closest to the motor connector may be solder bridged in pairs to make the soldering process easier. Of course, this only applies to the original 4-in-1 unit. I've never seen the newer one.
01-24-2007 Over year old.
 
 
toeknee73
Heliman
Location: Watervliet, ny

on mine, the "thing" that says SS14 cracked(split), what is it and can it be replaced?
01-26-2007 Over year old.
 
 
jhroof
Heliman
Location: Orlando, Fl USA

What about the CX2?

Does the CX2 use the same chip as the CX?
02-07-2007 Over year old.
 
 
aerangis
New Heliman
Location: McKinney, Texas

tt

"Good judgement comes from experience, and a lot of experience comes from bad judgement"
02-11-2007 Over year old.
 
 
Gene
Heliman
Location: Denver, CO

I have a fried Blade CPP 3-in-1 (2 MOSFETS completely detached on one side). I'm not confident in trying to repair this myself. Sticky, were you the one who offered to work on these? I remember a post somewhere but can't seem to find it back.

Gene
02-13-2007 Over year old.
 
 
aka_BoB
Heliman
Location: Huntsville, AL

Gene,

I just tore into a 4-in-1 from a bladecp I picked up on ebay. It glitched bad and went full throttle for about 3 - 4 secs (luckily I was able to catch the tail boom and not destroy anything or hurt myself), but it desoldered the two main motor mosfets during the ordeal. Anyway, I expect the replacement mosfets from digi key to arrive today... I expect all will go well with my repair since, I tested both mosfets and only 1 is dead, and the board cleaned up nice... If all goes well with my repair, I would be willing to look at your 3-in-1.

l8r,

aka

Thanks to all that supplied info on this post... it's helped me out alot! I always enjoy getting out the ol soldering iron...
02-14-2007 Over year old.
 
 
stickyfox
Key Veteran
Location: Troy, NY, US

Yeah, I fix them. I'm not sure if I'm violating the ad policy but hypothetically speaking, I'd probably ask $20 including return postage for a complete rebuild.

-fox
02-14-2007 Over year old.
HOMEPAGE  
 
 
ncpiperpilot
Heliman
Location: NC

Does anyone have the locations identified that the traces on pins 1 (the dot), 2, 3 and 4 run to? My pads were pretty shot and I need to run jumpers, but its really hard to follow the traces with a crispy board.

Thanks, Bill
02-14-2007 Over year old.
 
 
dbacon
Heliman
Location: Shelby Twp, MI, US

I have the same problem as ncpiperpilot, my traces to pins 2 & 4 of the FET closest to the power pigtail were wiped out.

I read on this thread that the signals come directly from the control IC, but does anyone know exactly where?

I cannot trace them with an ohmmeter, because they are gone, but I could jumper them with small wire-wrap wire if I just knew where they went.

Thanks for the help.
02-16-2007 Over year old.
 
 
stickyfox
Key Veteran
Location: Troy, NY, US

I don't have a CX board to compare to, but there is a small resistor pack somewhere near the FET. The thin traces go to the resistor pack, and each of the thick ones goes to a motor terminal.

-fox
02-16-2007 Over year old.
HOMEPAGE  
 
 
dbacon
Heliman
Location: Shelby Twp, MI, US

Thanks stickyfox, I will have to chart the ICs and look them up to see which is a resistor pack.
I have taken some close-up photos of the board, both sides, and I will expand and sharpen them up before I post them, I hope you can comment on them when I get them posted, with notes.
Here is what I have so far, but I will label things and re-post them.

02-16-2007 Over year old.
 
 
stickyfox
Key Veteran
Location: Troy, NY, US

Oh, wait a second. heh..

I've seen a couple different CX boards, but I haven't seen this kind before. Apparently they change layouts pretty frequently. Is this the kind you're working on now?

-fox
02-16-2007 Over year old.
HOMEPAGE  
 
 
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e-E-Flite Blade CP CX 400-3D > How to repair burned out Blade CX 4-in-1 controller
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