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Old Jan 25, 2013, 06:14 AM
delwinnikolov is offline
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Damaged Futaba 6EX TX


Hello all,
I've made a stupid thing reversing the battery polarity (by mistake) of my 6EX transmitter. Now the TX module seems dead, no leds and no TX, only the LCD is working and the controls. Anybody knows how could I repair it?
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Old Jan 26, 2013, 09:55 AM
delwinnikolov is offline
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repaired


Hi there, I'm glad to report that the radio is repaired. For anybody with this problem, dead(6EX) TX after reverse polarity, check the voltage regulator on the TX board, it is a SMD 7805, replacing it solved the problem.
Old Jan 26, 2013, 11:11 AM
RC Man is offline
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The older Futaba radios had a diode to prevent that from happening. I don’t know why they have left out that on the newer radios.

.
Old Jan 26, 2013, 12:06 PM
pilotpete2 is offline
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If I'm not mistaken, the diode in the entry level Futaba's was in the charge jack circuit to prevent reverse charging the Tx battery. More expensive Futaba's use a PolySwitch circuit breaker instead of the diode. I'm pretty sure that if you connect the battery to the radio with reverse polarity, there's no protection against that
Futaba's use of a standard servo plug for the Tx battery does make that very hard to do. You really have to wire the connector backwards to let out the magic smoke

delwinnikolov,
Nice to hear you have it fixed
Pete
Old Jan 26, 2013, 03:09 PM
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Quote:
Originally Posted by delwinnikolov View Post
Hi there, I'm glad to report that the radio is repaired. For anybody with this problem, dead(6EX) TX after reverse polarity, check the voltage regulator on the TX board, it is a SMD 7805, replacing it solved the problem.
Thank you, any similarity to the photos and information shown:
Futaba - T6A - Reverse Polarity DIY repair.
"the element that had burned was a power regulator, the equivalent one LM78L05 "

Alan T.
Alan's Hobby, Model & RC FAQ Web Links
Old Apr 09, 2016, 07:44 PM
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Hi guys. Same thing just happened to me, burnt my 6EX futaba due to reversed polarity. I'm trying to find this voltage regulator on the board, so I can replace it. Does any one have pictures, or can describe the location of this component on the board?
Old Apr 10, 2016, 03:15 PM
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Why not follow the link above ?
Old Apr 10, 2016, 03:56 PM
KC is offline
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nvm...
Last edited by KC; Apr 10, 2016 at 04:02 PM.
Old Apr 10, 2016, 07:12 PM
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Quote:
Originally Posted by Mukenukem View Post
Why not follow the link above ?
Because it's the link for another radio, isn't it? The one I have is the 6EX.


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