Typhoon H binding problem. No orange lights

jnmchlmnnn · Apr 5, 2023

My copter does not go into bind mode.
Following the binding verification pdf I get stuck on step 38. The rear led keeps blinking blue fast. And after tilting a while it changes to very fast red blinking.
What can I do?

Steve Carr · Apr 5, 2023

jnmchlmnnn said:
And after tilting a while it changes to very fast red blinking.

Are you certain it's red or is it orange?

jnmchlmnnn · Apr 5, 2023

Steve Carr said:
Are you certain it's red or is it orange?

It is absolutely red and very fast blinking

WTFDproject · Apr 5, 2023

jnmchlmnnn said:
My copter does not go into bind mode.
Following the binding verification pdf I get stuck on step 38. The rear led keeps blinking blue fast. And after tilting a while it changes to very fast red blinking.
What can I do?

Keep moving in the procedure. I suspect you have a problem with the rear LED. You may encounter other steps when the rear LED colors will not match what is expected.
If you get the receiver ID displayed at Step 46, you're probably good to go. Just be aware the rear LED is going to get very confusing while trying to fly.

jnmchlmnnn · Apr 5, 2023

After changing antenna on the st16 I managed to bind

)
But my main led changes from solid purple to alternating blinking red and purple and drone beeps twice when changing to this status.
Can't find the meaning of this.

DoomMeister · Apr 5, 2023

To try and verify the Main LED functionality please go through this list of steps.

1) turn on just the aircraft - you should get blue flashing 5 times per second

2) now turn on the ST16 and allow aircraft and camera to connect

3) place the Mode Switch to Smart mode (up) - you should get a flashing or solid green Main LED depending on the state of GPS Acquiring or Ready

4) place the Mode Switch to Angle mode (mid) - you should get purple on the Main LED

5) place the Mode Switch to Home mode (down) - you should get a red flash on the Main LED 5 times per second

This will confirm that all three colors are working on the Main LED board.

jnmchlmnnn · Apr 5, 2023

DoomMeister said:
To try and verify the Main LED functionality please go through this list of steps.

1) turn on just the aircraft - you should get blue flashing 5 times per second

2) now turn on the ST16 and allow aircraft and camera to connect

3) place the Mode Switch to Smart mode (up) - you should get a flashing or solid green Main LED depending on the state of GPS Acquiring or Ready

4) place the Mode Switch to Angle mode (mid) - you should get purple on the Main LED

5) place the Mode Switch to Home mode (down) - you should get a red flash on the Main LED 5 times per second

This will confirm that all three colors are working on the Main LED board.

Did this and found out that the Green is not working. Any suggestions how to restore?

Vaklin · Apr 5, 2023

With a new one is the simplest way. They were cheap. Of course, first, trace the wires.

DoomMeister · Apr 5, 2023

We have found a weak solder joint on the LED board and a quick touch up with flux and solder got it working. The last one was at least a couple of years ago. I’ll see if I can find photos. If not, I’ll pull one from an H480 and try to annotate the photo.

jnmchlmnnn · Apr 5, 2023

Vaklin said:
With a new one is the simplest way. They were cheap. Of course, first, trace the wires.

I checked the little board which has the led and that looks all fine. The wires disappear in the battery compartment. Where do they go/connect? How do I get to the other end to check connections?

Vaklin · Apr 5, 2023

Await until @DoomMeister gives pictures.

h-elsner · Apr 6, 2023

DoomMeister · Apr 6, 2023

You can test the LED itself with a 1.5 V alkaline battery. I’ll pull the board later today and trace the circuit. As I remember there were current limiting resistors from the 5VDC to the positive leads and then a switched ground connected to the negative leads that came from the Main Board.

h-elsner · Apr 6, 2023

Status LED has it's own power supply (TPS54331).

DoomMeister · Apr 6, 2023

I found that out when I pulled the covers and started tracing circuits.

Any idea what voltage comes from the Mainboard? The 54331 is a Texas Instruments DC-DC Buck Converter that operates with 3.5V to 28V input.

jnmchlmnnn · Apr 6, 2023

DoomMeister said:
I found that out when I pulled the covers and started tracing circuits.

Any idea what voltage comes from the Mainboard? The 54331 is a Texas Instruments DC-DC Buck Converter that operates with 3.5V to 28V input.

I tested the led directly at the led contacts. And only Red and Blue from the RGB are lighting up. No Green. So that explains my confusing light signals. I will order and replace the main LED unit.

Thanks for the help!

Vaklin · Apr 6, 2023

Be careful with soldering. These LEDs are very temperature sensitive. The plastic is melting very easily.

DoomMeister · Apr 6, 2023

For the component side of the circuit board please refer to the photo in Post #14 from @h-elsner as it has better lighting than the one I took. The 54331 U1 IC and most of the circuitry around it forms a regulated power supply for the board. Voltage from the Main board in the aircraft is supplied to pins 2 (+) and 7 (-) and the supply to the board comes from pin 8. The cable to the Main board has the following pinout.

The voltage from U1-8 is supplied to the positive terminals of the tricolor LED as shown here.

The signals coming from the Main board to select Red, Green, and Blue go through a voltage divider to a G2306 MOSFET and current limiting resistor to the cathode side of the respective LED’s as shown in the following drawing.

The next time I get into this I’ll take some voltage readings also. Need to do it while using a lighted magnifier. Would be easy to short something out otherwise.