Oh Dear! I Just Fried My Whole Truck!!! - RC-Monster Forums

brijar · 07:41 PM

This really really really really really really really really vacums:mad:1:035:! I was trying to wire in a fan so that if I turned on the main switch, the fan would turn on too. The fan would be powered from the main batteries. I also wanted another switch that would switch the fan from being powered from one 7-cell battery to both 7-cell batteries. Well, I wired everything up like in the pic.

When I turned switch 2 on, the fan turned on, my shifting servo went beserk and stripped itself, smoke came up from somewhere, I smelled that horrible smell of burning silicon, whether it be a circuit board or wire insulation or both, and a steady stream of curses issued from my mouth. That was yesterday. Today, I wanted to try and run my truck. I put everthing back together, only with no fan in the equation. Just all the servos, esc, and RX pack plugged in to the reciever. I turned on my transmitter, then the reciever. Nothing happened. The servos didn't even move like they do if you turn the reciever on without the transmitter on. I cursed. I checked the Rx pack. It read a little over 6v. My 7-cell GP3300s were freshly charged. I tried switching to a different Traxxas 3-channel reciever. Nothing. Once again, I cursed. I untwisted the programming wires(same as removing red programing jumper) to try and program the 9920. I turned it on again and plugged the batts in. Nothing. The ESC didn't even make the motor beep for programing:012:. I usually have a very clean mouth and don't curse or swear or cuss or anything like that. Today is different. Very different. I went and got out my EVX. I plugged a battery into it's BEC side and the little LED lit up. I plugged it into the channel 2 port on the new reciever. Then I plugged the steering servo from my Villain into channel one. I turned on the transmitter and the servo budged. I turned the steering wheel right. The servo turned right. Then I tried plugging in the steering servo in my E-Maxx in place of the boat's servo. Nothing. Didn't budge, didn't respond:012:. Right about now, I'm bawling my eyes out because I know what's comming. I plug the EVX into the battery slot on the new reciever and plug the shifting servo into channel 3. Nothing:012:. I take the plunge and plug my poor little 9920 into channel 2 on the new reciever with the EVX providing BEC in the battery port. I turned on the transmitter and squeezed the throttle. NOTHING!!!!!!!!!!!!!!!!!!!!!:012::012::012:

This is very, very, very, very, very, very bad. I can't afford another 9920, and even if I could, my parents wouldn't let me spend that much money. I have to save half of what I make, and right now I have about $10 of usable money. I'd have to make $360 to buy another one. That would take about a year or two.
My only hope is that one of you might come up with something I overlooked, or if my 9920 is under warrenty or that Mike has some way he could fix it.

Thank you for any effort you put into this,
Brijar...:012:

hunter306 · 07.21.2006, 07:07 PM

Ok, According to the diagram above.. It looks like you have fried your Reciever, not your ESC.

Ofcourse, since the reciever is attached to the ESC, there is a possibility for damage to the ESC.... But I would suggest replacing the RECIEVER first, as I believe what happened is that one of your 8.4v packs sent 8.4v through the reciever power circuit and to all of the attached servos...

-J

coolhandcountry · 07.21.2006, 07:31 PM

I don't like the looks of your wiring diagram. It looks almost as if you shorted some of your stuff out. I not sure what may have fried and what may not have. Is the receiver letting power go thru to other stuff. did you try internal bec on the esc to see if that helped. I would try it on one 8.4 pack or 12 cells.

brijar · 07:45 PM

That's what I thought. It may have sent the whole 16 volts through the system though. 8.4 is not that much more than the 6 it usually gets, but 16 will definately blow it.
Also, if the voltage was sent to the reciever and blew it, then went on to the servos, it would most likely have gone to the ESC as well:012:.
As I stated in my first post, I did try a different reciever. Same brand and model, but it was a different receiver. I know that that receiver works too, because it opperates the steering servo in my boat when my EVX is powering it. I also tried using different crystals too.
It seems to me that I have had rather bad luck lately. I just recieved a $70 order from RC-Monster and Tower. I had also just gotten my front CVDs from Ebay. I just found out my now fried steering servo just went out of warrenty:dft002:. I have almost bullet-proofed my drive line with full CVDs, Steel Idler in 1st, Aluminum diff cup in the rear, and 4-screw differential cases. Just when I get it all together, something else breaks:007::035:.
Why me:025:...

Brijar...

Edit: Coolhand, the reciever won't do anything. None of the channels work, no matter what I do. But I'm more worried about the 9920. I've tried using a new and working reciever on it with external BEC supplied from a working EVX, and it won't do anything. I'm going to go try the ESC again with the new Rx and a 6v reciever pack.

coolhandcountry · 07.21.2006, 07:43 PM

Well the esc may be fixed under warranty. Hard to say. You can strap the shifting to one gear and play. As for the steering. You may have to go back to a stock servo if you have it to play. Email mike with the like to this thread and see what he says. I hope you the best.

brijar · 07.21.2006, 07:47 PM

Thanks a lot. I'll see if I can E-Mail Mike. I probably have a spare servo somewhere that I could use for shifting, and I can take my 2055 out of my boat and use it for steering.

Thanx for the quick replies,
Brijar...

coolhandcountry · 07.21.2006, 07:49 PM

Sounds like the esc is holding up the run now. I would try the internal bec to see. I would think you could do much else to it. :D I would not have it hooked to nothing when plug it up for the first time.

brijar · 07.21.2006, 07:58 PM

I just tried the internal BEC, and it works. I used a jumper on the spare main power plug, used one 8.4v battery and put the little black jumper back on the two prongs farthest toward the center of the ESC. I plugged it to the steering servo of my boat, and it works. I removed the Rx pack from the reciever and only had the ESC and the servo plugged into the receiver. The servo moved, but the ESC wouldn't do anything.

Brijar!!!

sjcrss · 07.21.2006, 08:07 PM

my suggestion would be to contact Mike or even BK, I know I had my 1895 Micro replaced for $150.00 wich is way below hte $425.00 it cost me new, and it was 4 yrs old.....and I fried it by sending 123 amps thru it, and htey even upgraded it for me to a 2095....just a thought...

MetalMan · 07.21.2006, 08:23 PM

The wiring diagram is perplexing. I don't know how the wires are connected on Switch #1, but it's very possible that you shorted out the battery through the switch. I'm curious why there's a wire going from one of the main batteries' positive wire to the positive wire of the receiver.

standard_63 · 07.21.2006, 08:51 PM

I would make sure it's wired correctly and try it again. I don't think the switches are a very good idea, they might not even hold up to the current. With the fans and ubec in there the wiring seems pretty hairy to me as it is, no need to make it even more complicated!

I've had escs that worked ok with jumpers and adapters on the battery, but on my 9920 I had to wire it up directly and use 2 batteries all the time, otherwise the speed control part didn't work right, one time I even smoked it! It still works now (knock on wood), so if your steering/bec works maybe it's still ok.

Try it with no fan or ubec at first, and make sure your solder joints are nice and solid. If it works, then you can add in the fan and ubec and sigh relief!

Good luck ~ I've once burnt 3 escs, 2 motors, and a set of lipos in one month, I feel your pain!!

squeeforever · 07.21.2006, 10:22 PM

Its certainly your wiring. I'll try and make a diagram if you still want a similar setup...Given the ESC is still ok.

brijar · 07.21.2006, 10:30 PM

Quote:

Originally Posted by MetalMan

The wiring diagram is perplexing. I don't know how the wires are connected on Switch #1, but it's very possible that you shorted out the battery through the switch. I'm curious why there's a wire going from one of the main batteries' positive wire to the positive wire of the receiver.

This is what my switches look like. Switch one has one wire connected to both center terminals going up, one wire connected to both left terminals going down and one wire connected to both right terminals also going down.
Switch two has a positive wire from the battery connected to the left center terminal and a negative wire from the battery connected to the right center terminal. Switch two also has a positive receiver wire connected to the left side of the left terminal and a negative reciever wire connected to the right side of the left terminal. Here's a revised picture:

There is a bigger version of switch two on the right side.
Originally, I just connected the positive fan wire to the positive battery lead of the ESC. Then I put the negative fan wire to the yellow bridge wire. But then the fan would run when I had one battery plugged in. I was just too lazy to simply unplug the batteries.

If I make it out of this alive, I'm simply going to run the system without a fan and just change my gearing if it runs too hot. I'm trying really hard to get my parent(s) to help me E-Mail Mike. I'm also going to see if Tower will give me a couple of months extra on the warrenty of my steering servo, as I have spent around $1220:dft002::eek::confused: on them alone:013:.

I still can't get anything to work. I stuck an old motor and esc in my Rustler and took it for a quick spin, just to take my mind off things. I really don't like the look in my parents' face when I told them how much this costs:013:. If I can't get the ESC fixed for really cheap, like less than $50, then I might have to give up brushless:012:. I WON'T LET THE BRUSHED PEOPLE TAKE ME ALIVE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!:035:

Brijar...

hunter306 · 07.21.2006, 11:24 PM

Just took another look at your NEW diagram.

Don't do it that way either, you'll blow up even more components. I'd suggest you let someone figure the wiring diagram out for you, because as of now, it's not even close. (No offense)

Someone with a little bit more electronics experience might be able to get this going the way you want it to.

BrianG · 07.22.2006, 12:08 AM

First of all, what is the fans rated voltage? Are you trying to achieve dual speed with switch 1?

Switch 2 is hooked up very oddly. It's not obvious, but if switch 1 is in the left position and switch 2 in the left position, you are sending 16.8v to the fan, and are sending that same 16.8v to the Rx and Rx pack. Very bad. You can't forget that the throttle lead of the ESC has a ground in it and hooks to the Rx creating a common ground path through the Rx.

I will draw up a new diagram for you if you like. But first, I'll need to know the answer to my first question.