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Mar 29, 2011, 10:48 PM
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Thread OP

Repair Your Fried Turnigy/Flysky/Eurgle 9x Radio (aka Reverse Polarity and You)

Well everyone, after much help from the members of this board, I've finally managed to get my Turnigy 9x back fully functional after it's fateful brush with high-voltage death.

Of course, if you're reading this, you've likely already learned that, about 2 seconds too late.
When you introduce 11-ish volts going the wrong way, you'll most likely kill all 3 voltage regulators (VRs from here in) and 1 very small SMD capacitor (Cap hereafter).

Fortunately, there is hope! With a (4) parts, a decent soldering iron, and digital multimeter, and some patience, you can most likely get back in the air before too long.

I quick note about tools...
You don't need a ton of expensive gear to make this repair, but if you do have to go out and buy everything from scratch, it might be worth adding up the cost of the parts and tools and see if it's cheaper to just replace the radio. On the other hand, if you buy the stuff, you'll have it for the next time you want to fix or mod something, so you do the math.

You'll need:
(1) A decent soldering iron. Variable temp control is nice, but not critical. Just MAKE SURE that you don't use a high wattage iron, or you'll just do more damage.
The model I have is no longer available, but has been replaced by this model. I'm anything but an electronics expert, but I do end up soldering stuff fairly frequently, and I've been nothing but pleased with this model.
Within reason, get the smallest tip you can find. You'll be doing some SMD (surface-mount) soldering, and the smaller the tip the easier it will be to only heat the target part.
You don't need a fancy station, though. This will work or even this. Just try to get a fine tip for whatever iron you get. Radio Shack sells a basic one too, but get the lower power model.
While you're there, get some electronics solder and maybe some solder braid for cleaning up where you remove parts. Neither of these are expensive and will last you a long time.

(2) A pair of helping hands (or similar device) is almost a must. If you happen to live near a Harbor Freight Tools store, they have them pretty cheap. Without this, you'll find yourself 1 or 2 hands short at nearly every turn. It's not impossible without it, but it sure feels that way sometimes!
I have this version, which is larger, has a lighted magnifier and is more stable than the smaller model.

(3) The parts themselves.
For this, you'll have to pick your best source depending on where you live, but in my area Digi-Key is by far my best bet.
The following are the parts you're likely to need. I suggest getting a couple of each, because they're super cheap and you'll feel dumb if you have to place another order because you dropped the tiny SMD Cap or broke a leg off a VR.
1x This Cap (Part # 478-1682-1-ND)
1x This VR (Part # LM78L05ACZNS-ND)
1x This VR (Part # 296-11118-1-ND)
1x This VR (Part # NJM78M05FA-ND)
***Please Note: These are the parts I needed. I cannot guarantee that you'll need the exact same parts. I hear that there have been several revisions of the hardware used in the 9x radios. You are responsible for verifying that the parts you order are the correct ones.***

Okay, with that out of the way, let's talk about the actual repair.
In my case, when I plugged in the battery pack in "reverse polarity mode", (aka D'oh!) I heard a sickening *pop* and got a nasty burned radio smell and a wisp of magic smoke.
You may be wondering how it's possible to plug in the battery pack backwards when it's a keyed plug and only goes one way, right?
Well, Mr. Smarty, that's only true of you are using the horrible OEM battery holder. However, if you've replaced your "battery vampire" as I like to call it with a nice, small, efficient 2S or 3S LiPo pack, then it's REALLY easy to get it wrong, especially if you haven't messed with your radio in several months and forgot that polarity mattered, if only for a second.

Since then, I've replaced the JST connector on the pack with a custom cable I hacked together from an internal CD-Rom audio interface cable (if you have to ask what that is, you probably don't have one) and a female servo plug that I "modified" with my soldering iron. It ain't pretty, so I won't show it to you, but it's easy enough to make your own or just clip the plug off the OEM holder and solder that plug onto the leads of the LiPo pack. Again, be sure to get the polarity right, or you'll be doing this all over again very soon.

You can take 2 approaches to fixing your radio. You can (A) carefully test out each and every connection, trace paths, take hi-res photos of every part of the board to look for breaks, test everything for shorts, etc...
or (B) replace all 4 of the above mentioned parts for about $5 and see if it works. I call this the mechanic's approach, since that seems to be what my mechanic does whenever I bring him my car.

After you replace the parts, plug your pack in (the right way!) and power up the radio.

What happened?

If it works, REJOICE! Well, almost. You still have to test the Tx and verify that the module is binding and syncing up with the Rx.

If nothing happens (dead screen still), go back and check your solder connections, especially the cap and the small VR next to it on the main board. Those are jammed in there pretty good and it's easy to bridge a joint without noticing it.

If you heard another *POP*, put down the radio and go find another hobby, I just can't help you any more. LOL

In any case, this should get you pretty well along on repairing your fried/semi-fried 9x radio.

To get to the parts, you'll need to open the case. This is really easy, requiring you to remove the 6 Phillips-head screws from the back of the case.
Once the screws are out, carefully separate the 2 halves of the case, taking care not to snatch the cable that connects the two halves.
Open it enough to get to the connector, then unplug it from the main board. You'll probably have to rock it side to side to get it loose. Just be careful and use firm but gentle pressure and it will eventually unplug. A small flat blade screwdriver or other tool sometimes helps by lifting under the edge of the connector. Be careful not to pull on the wires too much or you'll have another repair job on your hands.
With that cable off, you can now separate the case into 2 parts.
Set the "back" part (with the 2.4Ghz module and battery tray) aside for now.
Most of what you will need to replace will be in "top" half, where the screen and sticks are.
This is what your main board will probably look like.
Note that in the picture, I've already removed all the connectors and unscrewed the board from the case. You'll need to do this also.
There are 9 screws holding the board down. 4 are silver, larger and at the outside 4 corners. The other 5 are gold, smaller and on the interior of the board. Remove them all.
Also take care when removing the 5 white cable connectors and EXTRA care when disconnecting the small flat ribbon cable at the top center of the board. This cable connects the main board to the LCD screen and is easy to damage. Use a small pick, screwdriver or knife point to carefully push the brown locking bar away from the board. You will be sliding the bar along the plane of the board, not lifting it up. Don't expect it to come off, just open it up enough to slip the flat cable out.

More to be added soon.....

I'll be adding photos and more data along the way as other suggest what is needed to fill this out into a proper repair tutorial.

If you want to follow the whole ordeal, with all the troubleshooting steps and what didn't work (which may be helpful if just replacing everything doesn't work or if you just don't like that approach), then start with post #4589 on this page.

I'd like to take this space to give special thanks to those who spent so much of their own time helping me work through the issues to get my 9x flying again.

In no particular order, they are:
GrootWitBass, jpparisy, export!, S_Mack, MoFl, and others who I've forgotten at the moment.

Last edited by CX2Mike; Jan 31, 2012 at 09:37 AM.
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Mar 30, 2011, 12:56 PM
master of the universe
captaingeek's Avatar
adding a diode to the battery input to add protection would be very cheap insurance to prevent this from happening in the future.
Mar 30, 2011, 01:38 PM
Registered User
Thread OP
Originally Posted by captaingeek
adding a diode to the battery input to add protection would be very cheap insurance to prevent this from happening in the future.
Adding a diode was discussed in the main thread, but I don't think it's necessary if you use the proper plug.
Plus, adding the diode will cause enough voltage drop from the pack that using a 2S battery might be an issue.
I think S_Mack had details on that if you're interested.
Sep 14, 2011, 01:16 PM
Registered User
Thank you so much!!!!! I fried mine 5 minutes after I got it -.- got it back working now though, but I cant seem to get a battery voltage reading... might do more digging, but the low bat beeps really get annoying :P If I cant find the fault, i might just disconnect the beeper ... AT LEAST ITS WORKING AGAIN ^^
Nov 23, 2011, 09:01 PM
Registered User
pavn's Avatar
I just fried my Turnigy 9X today by wrong polarity. See the attached picture... Do you think there is a hope to fix it...?
Nov 25, 2011, 07:12 AM
Registered User
pavn's Avatar
I was able to unsolder capacitor... The resistor above and very near to capacitor does not look good... I would probably need to replace it... Do you know value of resistor?
The PCB around capacitor is very bad... burned... so it complicates thing further...

Do you know value of the resistor? Do you think still it is possible to fix this 9x?
Last edited by pavn; Nov 25, 2011 at 07:19 AM. Reason: added information...
Feb 15, 2012, 08:34 PM
Registered User
CrazyLittle's Avatar
I fried my 9x and replaced the 4 parts listed in the OP, and it worked again for about a day. But now the radio is acting funny - the LCD fades out as soon as you turn it on. You can see the initial screen start up, but it quickly stops working. Any idea why that would happen, and what needs to be replaced to fix it?
Mar 06, 2012, 12:46 PM
Registered User
Hi I did the same funny thing plugging the battery reversed. I replaced the cap and the VR in mainboard, tested ok vr in switch board. First start everithing ok then it started acting funny when i was changing model. I shut it off and next power on i got EEPROM ERROR and loud buzzer. I tried restoring the eeprom switching on with exit button pressed but it says restore for 10-15 seconds and then it goes EEPROM ERROR again. Can anyone of you guys help me understand what´s going on?

Sorry for the not so perfect english!!

Mar 06, 2012, 01:38 PM
Registered User
Thread OP
Sorry guys, I can't be much help other than what I already posted.
I was only able to get mine fixed due to the generous help of those on the board.
If you tried what I posted, and are still having problems, you'll probably need to start a thread about your specific issue.
Wish I could help more, happy flying (eventually!).
Mar 30, 2012, 03:24 PM
Registered User
What about using a P fet transistor, or HExfet transitor coupliong???
Low power drainage, and very stable.

Apr 13, 2012, 10:31 PM
ClimaxPilot's Avatar
Anyone in Australia done this fix ?

RS components over here have a minimum order of 25 pieces on 2 of the 4 parts required, with postage it's over $50 just to get the 4 small components.

Just wondering if anyone has done it and has extra's laying around ?

And yes, I fried my 9x the other day, it looks very fixable tho, you can barely tell the cap let go.

Apr 18, 2012, 07:17 AM
Registered User
It happened to me . i connected reversed but i did hear anything .Just smoke
can it be fixed. please help
May 23, 2012, 12:15 PM
Registered User
My problem is I got my 9x and plugged in the battery it worked fine I have a 3s with the servo plug on with center as pos and the outside as neg My radio does now not work but how can I have plugged it in wrong 3 pins on radio 3 pins on battery center pos it wont matter which way its plugged in if center is pos WILL IT? all I know is mine is bricked But iv no clue how or why plus no pop or smell or smoke Doh Whats up anyone care to suggest anything?

Aug 02, 2012, 02:20 AM
Vertical Unlimited
Straight Up's Avatar
Originally Posted by ClimaxPilot
Anyone in Australia done this fix ?

RS components over here have a minimum order of 25 pieces on 2 of the 4 parts required, with postage it's over $50 just to get the 4 small components.

Just wondering if anyone has done it and has extra's laying around ?

And yes, I fried my 9x the other day, it looks very fixable tho, you can barely tell the cap let go.

I live in Australia, and a friend of mine did this fix for me (but I was living in Canada at the time). I got the parts via the internet (mostly eBay) - major cost was shipping ($22 for the CAP!). I suggest you trawl the net outside of Australia and negate the local rip-off problem.
Oct 15, 2012, 12:24 AM
Registered User
cr2o3's Avatar
Yes Yippeee!!!! I've just fixed my 9X and it's like new. I got the parts from Element 14 (ex Farnells) in Sydney. They take small amounts, I bought 3 of each just in case. Without freight they cost $9.95 freight was $12.95. and took Friday to Monday.

I can give you part numbers as it's a lot easier than the full description.
All parts are 5 volt voltage regulators.
type numbers:...


One is very tiny, be careful when desoldering the old one so you don't remove the copper track as well. It's on the main board below the main power lead socket from the other part of the case and the first regulator moving left.

Another is within your RF module and is larger.

The last one looks like a transistor and lives almost under the on/off switch, not the one near the beeper (it is a transistor)

Once you get the parts you'll know what I'm talking about. Element 14's net address is....

Good luck, it really does get them going again.

I just copied this from the email order

Order Code Quantity Availability Line Price Description Mfr Part #
1366573 3 In Stock 3.42 V REG +5.0V, SMD, SOT-89-3, 7805 L78L05ACUTR

9665374 3 In Stock 2.52 IC, V REG +5.0V, 78M05, TO-220-3 MC78M05CTG

9489444 3 In Stock 4.02 IC, V REG +5.0V, 78L05, TO-92-3 LM78L05ACZ

Good luck mate Stu

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