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Re: Turnigy 9xr Pro + FrSky XJT + D4R-II won't bind

Posted: Mon Nov 09, 2015 10:36 pm
by MikeB
Is that a hole burnt in the chip?

Mike.

Re: Turnigy 9xr Pro + FrSky XJT + D4R-II won't bind

Posted: Tue Nov 10, 2015 4:18 am
by n1trog3n
MikeB wrote:Is that a hole burnt in the chip?

Mike.
Looks like you're right. Seems like a small hole....

Re: Turnigy 9xr Pro + FrSky XJT + D4R-II won't bind

Posted: Tue Nov 10, 2015 9:56 am
by MikeB
I'm fairly certain that chip is the switch mode, voltage regulator. If that is 'broken' it is also possible other components have been damaged by an incorrect voltage supply. That regulator provides 5V, and there is then a linear regulator to provide 3.3V, so you might find the important chips are OK.

The 5V is present on the SPort connections. Measure the voltage between the + and - signals on this to see if it is 5V (+/- 0.25V).

Mike.

Re: Turnigy 9xr Pro + FrSky XJT + D4R-II won't bind

Posted: Tue Nov 10, 2015 7:55 pm
by n1trog3n
Sorry, Mike. I did not get where I have to measure voltage. Can you show where on picture please.

Re: Turnigy 9xr Pro + FrSky XJT + D4R-II won't bind

Posted: Tue Nov 10, 2015 11:11 pm
by MikeB
On the back of the XJT are some pin headers, one row of 4 and another of three. Right at the bottom of the case is a diagram showing the connections to them. The three on the right are the SPort connections, labelled -, + and S.
Please measure between the - and + pins when the XJT is powered. Take care not to short them together.

Mike.

Re: Turnigy 9xr Pro + FrSky XJT + D4R-II won't bind

Posted: Wed Nov 11, 2015 8:02 pm
by n1trog3n
MikeB wrote:On the back of the XJT are some pin headers, one row of 4 and another of three. Right at the bottom of the case is a diagram showing the connections to them. The three on the right are the SPort connections, labelled -, + and S.
Please measure between the - and + pins when the XJT is powered. Take care not to short them together.

Mike.
I've measured the voltage. And I have 8.2-8.4V there...

Re: Turnigy 9xr Pro + FrSky XJT + D4R-II won't bind

Posted: Wed Nov 11, 2015 11:05 pm
by MikeB
OK, that means the chip with the hole in is not working, you are getting something like battery voltage not 5V.

The only fix is to replace the chip (at least, assuming there are no other problems), although I'm not sure at the moment exactly what the chip is. I don't have the circuit diagram for the XJT.

Mike.

Re: Turnigy 9xr Pro + FrSky XJT + D4R-II won't bind

Posted: Thu Nov 12, 2015 4:58 am
by n1trog3n
MikeB wrote:OK, that means the chip with the hole in is not working, you are getting something like battery voltage not 5V.

The only fix is to replace the chip (at least, assuming there are no other problems), although I'm not sure at the moment exactly what the chip is. I don't have the circuit diagram for the XJT.

Mike.
:cry:
Thats is exactly what I was afraid.
If you'll find out what king of chip is it-let me know please..

Thank you for you help.

Re: Turnigy 9xr Pro + FrSky XJT + D4R-II won't bind

Posted: Thu Nov 12, 2015 5:54 am
by Kilrah
Should be a TPS5401.

Re: Turnigy 9xr Pro + FrSky XJT + D4R-II won't bind

Posted: Thu Nov 12, 2015 5:45 pm
by n1trog3n
Kilrah wrote:Should be a TPS5401.
Ordered one.

Re: Turnigy 9xr Pro + FrSky XJT + D4R-II won't bind

Posted: Tue Mar 22, 2016 3:35 pm
by CptanPanic
Did you ever get this working. Interesting thread.