B-Hyve irrigation controller

[Shaw]

My B-Hyve irrigation controller died this week and I've started to try and diagnose what's going wrong.

It has a 240v->24v AC power supply in the unit, and it seems to be working okay, though the voltage coming out of that is around 27VAC rather than 24VAC.  I'm now trying to trace the power circuit through the power board which is the Orbit WT-25 GEN II (can be googled) - it has a daughter board which has all of the low voltage/IoT stuff on it, and I've probed around with a multimeter on there and there seems to be some 1.3v around, but nothing around ~5v which seems weird.

I assume there would only be clean 5v (or similar) going to the daughter board right? 

Could anyone steer me in the right direction to keep debugging what's going on here?

TIA

[pk]

I have the same issue.  Did you ever resolve the problem? 

[fzabkar]

What voltages do you measure at the large 470uF capacitor and the small C4 capacitor (near inductor L1) on the PSU board?

[pk]

I see the c4 near the L1 but not the 470uF.

[fzabkar]

I see the c4 near the L1 but not the 470uF.

It's on the other side of the board. You can't miss it. :-)

[pk]

  I got 86.6 volts at the 470uF and 0 reading on the c4 (but it is so small I may just be not hitting the contacts right.)

[fzabkar]

U1 appears to be a step-down converter. The voltage on C4 would be the output voltage.

Can you tell us the markings on U1 and U3?

86.6 volts is very wrong for a capacitor that is rated for 50V.

[pk]

U1 has two lines of markings.  Top line looks like a backward capital C followed by four dots .. and the numbers 845. 
                                                                                                                                    ..
The second line is either B160 or 8160.
                                                                         
U3 has 4 lines.  Top line HC595, line two is 8220011, line 3 is YXD19, line 4 is 01D.

That was a real eye test!

                                                                                                                                    ..

[fzabkar]

SN74HC595DW, Texas Instruments, 8-Bit Shift Register, tristate outputs, 2V - 6V, SOIC-16:
https://www.ti.com/lit/ds/symlink/sn54hc595-sp.pdf

The other part is a diode (D2).

https://sigma.octopart.com/122137911/image/Diodes-Inc.-B160-13-F.jpg

I need the markings on the 6-pin IC, not the diode.

You need to find out why you are measuring 86V across a 50V capacitor. That's a serious problem.

[pk]

Thanks for all your help.  I got it from here.

[Khalednabil]

Hello,

I have the same device 'bhyve 12 zones' and the 6-pin IC got fried, and i am not able to read the markings on it anymore. Any chance someone can provide me with the markings on it.

Thank you in advance

[Fco_Letelier]

Hi I am having the same problem with my B-hyve irrigation controller. I measured 78 volts on the large Capacitor and 0 volts on the C4 capacitor. Did you manage to fix the problem? What was the malfunctioning component(s) that needed to be replaced? Thank you very much in advance

[Arieljd]

The voltage on Capacitor 470uF is around 36v. I'm having same problem with Orbit Power board WT-25 Gen II

[Arieljd]

Looking Youtube, I've found this video that maybe fix most of this failures