Eachine P51D Flight Controller Receiver Repair Update

[@chrisjanssen7105]

Love fixing things most folks would consider disposable. Thanks for demystifying the dead channel issue.

[@1nformatica]

You're welcome! Have a great day!!

[@Doggeslife]

Great problem solving. Note that since this video, I have encountered another plane who's ailerons did not function but was still in 4-channel mode. After tearing the plane apart I discovered that it was the transmitter that was faulty. I tried an identical duplicate TX and the ailerons worked fine. Dissembled the plane for nothing (heh heh). Happy flying!

[@1nformatica]

Hey thanks! Good to hear from you bud. How the FC senses the presence of the servo eludes me. In this case a servo that had worked before the magic smoke escaped now no longer was sensed (although it works OK on a tester). The servo I replaced it with was a standard one not from Eachine but it works OK, go figure!

[@Doggeslife]

@@1nformatica It is a curiosity as to what the trigger is to identify a servo present. I can only assume some code got zapped or a tiny cap or resistor was damaged. At least servos are cheap, and it's possible the "damaged" servo may still prove useful with another brand receiver like Eflite. Everyone have a great one over there! Peace and good health to all.

[@1nformatica]

@@Doggeslife Yes, it is very strange! Keep in touch.

[@nitro_nicksrc9629]

You have solved my problem Sir! I have the P51 and the F4U, but now the Spitfire is out and I decided I had to have one! Waited for the price to come down to a level that is more reasonable and then clicked on the button. Arrived yesterday, but found it had the three channel config (although I had forgotten about this "feature"). Wanted to check how the board looked and whether it was maybe that the aileron servo was not plugged in. Came across your first video on taking the PTQ apart and then saw that you had the exact same scenario I was seeing, with the aileron stick controlling rudder. Looked in your comments and saw posts from Oz tree crasher and Airdog. I have seen lots of their posts on RCgroups too. Really knowledgeable guys. Anyway, this encouraged me to take a look into the plane (Eachine now include hatches to make access easier!). Long story short, duff aileron servo. Banggood have been asked to supply a replacement and when it eventually arrives I will be able to fly my new toy! Thank you again for posting your videos. They really helped me sort out the issues.

[@1nformatica]

Hey thanks, glad to have helped solve your issue. The Spitfire is on my list too!! Thanks for watching, have a great day!

[@RichardTapp1]

I fly my Eachine models with an OpenTX transmitter with 4-in-1 Multi-protocol module. In the V761 protocol setup, there is an option for 3 channel and 4 channel modes. Doesn't help with the supplied transmitters, but they were the wrong mode (stick arrangement) for me, so I never used them.

[@1nformatica]

I repaired this model for a guy at the flying field. Personally, like you, I use an OpenTx (now edgetx) Taranis with the 4in1 module. Thanks for watching, have a great day!

[@BansheeFifteen]

I'm perplexed. I got two flights on my P51 and then no aileron travel. It does have the other three channels working. I was going to buy another one thinking that at least I'll have spare parts but what if the 2nd gets the same problem. It's not so easy to tear into one of these and try to troubleshoot with limited electronic knowledge. At least with an ARF you can usually get into each component fairly easily. Think I'll box it, shelf it, put the $110 towards something else. Thanks for the video.

[@1nformatica]

Getting into the guts is not that difficult as I show in another video : kzbin.info/www/bejne/o2G8npqOn9Jnqck It could be a loose or broken wire on the aileron servo. You can test by swapping the servo plugs around. Be brave! It is the only way to learn! Thanks for watching, have a great day!

[@TheKRU251]

Excellent. These 'strange' non working/working issues effect others too? Not just me then! Good to see your work here. Very interesting!!!!!!

[@1nformatica]

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[@ccrc3081]

Brilliant. Thanks for that. I have exactly the same issue with my 109. Contacted Banggood and they're sending new servo so hopefully happy days ahead!!

[@1nformatica]

You're welcome! Hope you get your 109 sorted soon. Thanks for watching, have a great day!

[@MCsCreations]

Wow... I would never imagine that! 😮 Fantastic work, my friend!!! Happy new year! And stay safe there with your family! 🖖😊

[@1nformatica]

Thanks Mario! Yes, a surprise for me too!! Happy it worked out, it was driving me crazy! Let's hope for a great New Year for all, keep safe.

[@arnydivision]

yo tengo otro problema distinto. No se porque se me quema el regulador que hay junto a las soldaduras del motor ( puede que no ponga el motor adecuado). Pero gracias a usted he descubierto que hay distintas formas de configurar y que es posible arreglar el regulador. Muchas gracias por compartir tanto conocimiento. Un fuerte abrazo

[@1nformatica]

¡Feliz de haber ayudado a mi amigo! Un saludo desde Andalucía.

[@arnydivision]

@@1nformatica soy de Almería. Vivo en Almería y necesito su ayuda ¿Sería posible?

[@1nformatica]

@@arnydivision ¡Por supuesto! Puedes contactarme en [e-mail] Cuéntame con qué tienes problema.

[@longjammeriii3323]

Fantastic outcome many thanks for your dedicated effort. Thanks for sharing and best wishes from Alan in South Yorkshire 🤗🤗🤗👍👍👍

[@1nformatica]

Hey thanks! It was a lot of fun!! Please consider subscribing if you have not done so already! Greg in Southern Spain!

[@stefankoch2868]

Thanks for this video! I bought two of these receivers to build custom planes (I was really impressed by my P51 and F4U flight stability). But I also have the problem, that only 3 channels activate, even though the connected aileron servo moves correctly through all positions initially. From the hardware, I wouldn't expect a too sophisticated detect-mechanism of the servo, so I simply tried pullups and pulldowns to "signal" at 3k3, 1k and 470 Ohms - To no avail.. :( After that, I tried a 10k pot to give something between GND and Vbat when not powered, also no success. As far as I see, GND and Vbat are directly connected to the servo-port, so the only way the receiver can "sense" a connected servo is the counter-reaction to "signal", no overall current sense. Probably you don't have an intact servo at hand right now, but it would be interesting to know the resistances of the original, unconnected servo between signal and Vcc/Gnd and also a diode-check in any direction from signal to the rails. I will try to catch with a scope how the receiver probes the servo-port initially by letting it float on mid-level with 2 soft resistors and give an update here if I succeed. But maybe it's something the processor reads back when moving the servo initially to both extreme limits. Thanks again for your documentation of this issue from Germany, Stefan

[@1nformatica]

I have been wondering how it sense the presence of a servo as well! I guess the servo is driven by an I/O pin on the processor so it drives the servo then monitors the input for some kind of feedback signal. It seems to be a bit "flaky" as it fails to detect all servos. The servo I replaced the "faulty" one with was one of these : bit.ly/4xServo1mmJST There appears to be nothing "special" about the servo.

[@stefankoch2868]

@@1nformatica Scanning the internet, I found another page describing a workaround but unfortunately not giving the root-cause. Your video was mentioned, too :) befinitiv.wordpress.com/2021/05/04/eachine-mustang-p-51d-aileron-servo-repair/ So, I'm still thinking it has something to do with the initial movements of the 4th CH servo. Like it's reporting hitting a "limit-switch" only when min/max is reached. In my (intact) P51, it seems the aileron-servos signal can be probed by a needle through the ventilation intake. I'll let you and your viewers know, when I find out more in a week, month, or even a year or two ;) kzbin.info/www/bejne/p16cnIOhqJV8nKc

[@carlosjimz]

Bought fu4 corsair, realgood flyer out of the box, paired then with tx16s edget and worked real good, then tried to see how the stunt button worked on the originsl transmitter and re-calibrated the tx and play with combinations of clicks and presses until the receiver board changed into 3 channel mode??? I havent troubleshoot yet.. Maybe the aileron servo fried or probably you can change between modes from the transmitter with a "hidden" stick combo. I will try recvonect aileron servo to see whatsup. THANKS for the information in this video..... UPDATE. I checked and aileron servo is mulfuntioning, (to much stress in my stunt roll tests) so when I manipule the aileron servo when connecting the battery the Rx board changes from 3 to four channel mode, so definitely when ail servo goes out then rudder takes over. Isn't that freaking clever??

[@1nformatica]

Yes, it is a fascinating board. No one has yet explained exactly how the board senses the presence of the servo! Thanks for watching, have a great day!

[@mikeneal5559]

I seem to have a similar probem. Can anyone suggest a replacement servo that can be purchased here in the UK? Can't seem to find the specification or part number of the one installed anywhere. Thanks and great work.

[@jeffrey-antony]

What is the purpose of the unused port (marked Wifi) on the servo board for ?

[@1nformatica]

I don't know for sure but I think it is for a GPS module like this : es.banggood.com/Eachine-E520S-GPS-WiFi-FPV-RC-Drone-Quadcopter-Spare-Parts-Geomagnetic-Compass-Module-p-1562308.html?gmcCountry=ES&currency=EUR&cur_warehouse=CZ&createTmp=1&ad_id=&gclid=Cj0KCQiA5NSdBhDfARIsALzs2EB7kGXeosO3RTdAmeinPQoMZki_kvDUDdOHIEIz2O8rlYJmPHKuFsUaAuZbEALw_wcB This controller is used in many Eachine / Volantex models. Thanks for watching, have a great day!

[@theoztreecrasher2647]

Thanks to tinkerers like you and DOGGe the rest of us stay sane! 😀

[@1nformatica]

Thanks! We do the tinkering so you don't have to!!

[@coloradofotomatt]

A bit late to the party but... All of a sudden the aileron servo on my new Volantex P51 has stopped working properly. Oddly, if I pull the elevator back and activate the ailerons it will work...briefly...then stop functioning again. Any easy fix? The first flights with this little bird were amazing - then yesterday I launched it (with a touch up up elevator). It launched, rose, then suddenly banked hard right and cartwheeled. I'm supposing based on your video that I'll have to replace the servo? I'm bummed because I just got this and have only had one good day of flying it before this happened. PS...the above link to purchase parts doesn't seem to work.

[@1nformatica]

They're great when they work, but then............ If it's new you should contact your supplier. A way to help diagnose is to swap the servos around. It seems no one can explain how the controller detects if a servo is connected to the aileron channel to set the appropriate mode. It's a bit flaky! Good luck" Thanks for watching, have a great day!

[@coloradofotomatt]

@@1nformatica Banggood (or its seller of these) is sending me two new aileron servos. I guess I'll be trying surgery when they arrive.

[@1nformatica]

@@coloradofotomattThat's a result! Take the "surgery" slow and careful and you'll be fine! There is nothing "special" about these servos, I replaced one with a "stock" one and it worked fine. Also strange is the "bad" servo also works fine provided you don't wont it to be an "aileron" servo, go figure!!

[@e泡泡]

it it a good solution，thanks a lot

[@1nformatica]

Hey thanks! KZbin no longer shows me if you are subscribed. Please consider subscribing if you have not done so already!

[@thomasschaub644]

I had the same problem, by using a new battery, the problem was solved

[@1nformatica]

Good to know! Please consider subscribing if you have not done so already!

[@JeffNowitski]

thats my problem to did u replace the board and servo .. and if u replace the board its can automatically bind

[@1nformatica]

I only replaced the servo. If replacing the board you can bind as in the manual for first time operation. Thanks for watching, have a great day!

[@JeffNowitski]

thx i already fix if i just reset the esc and it become 100% working

[@1nformatica]

@@JeffNowitski _•:*¨¨*:•_•:*¨¨*:•_ EXCELENTE_•:*¨¨*:•_•:*¨¨*:•_!!

[@johnnyc.763]

I flew this thing maybe 5times and the throttle has just stopped working... For the amount of hassle, it's not worth the price I paid (about $120), going to try RMA this plane.. Can't get ahold of Customer Service either, wtf..

[@1nformatica]

Sorry to hear your bad experience. I have all of the warbird series and never had a problem. This board was damaged by the owner connecting the batter backwards. Hope your supplier gets you a replacement. Good luck!

[@johnnyc.763]

Wow, the connector is keyed enough to prevent that from easily happening on mine. Only one of my batteries was making the motor start and now it won't start with all 3 batteries after being charged.. Hopefully 'customer service' replies soon.. Thanks.

[@1nformatica]

@@johnnyc.763 Are you using the supplied transmitter? Does the model bind and the servos work OK?

[@johnnyc.763]

@@1nformatica Yep. The servos work, just the darn throttle/motor doesn't.

[@1nformatica]

@@johnnyc.763 Just for the avoidance of doubt..... The led on the TX and RX in the plane are solid red to indicate it is bound? The control surfaces can be controlled by the TX not just the gyro in the plane? Finally, the Tx should beep twice when you arm the throttle by moving it to the fully up and down positions. I'm not trying to teach you to suck eggs, sometimes things get overlooked! Good luck!