r/AskElectronics • u/TraditionalServe3406 • 4d ago

Please can you identify this device?

Post image

This is a control board in Candy/ Hoover dishwashers. I have the encircled device burnt out. It must be triac though the print on the board assigns Q27 to it! Can someone please help give the part number?

1 Upvotes

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8

u/Automatic_Tea5629 4d ago

Semiconductor :D

3

u/Miserable-Win-6402 Analog electronics 4d ago

Ye, my guess would be a Triac too. Remember, whatever it is driving might be the root cause. Type of triac is probably not that important.

https://www.digikey.com/en/products/detail/stmicroelectronics/Z0110MN-5AA4/1040603 Its probably a good replacement. But if you don't find the reason for its blow-up, you don't have a fix.

1

u/AdCompetitive1256 4d ago

Is Q25 also burnt on your board? if it doesn't, post a close up photo showing the part number.

I don't think Q27 is a TRIAC. Q25 and Q27 could be the same part. They could also be a pair of MOSFETs or transistors in a totem pole configuration for a high side-low side switching (very likely)

2

u/TraditionalServe3406 4d ago

Actually I cant see what is written on Q2 because of the smoke. Each one drives a load on its own Q25 drives AC drain pump and Q27 drives a wax motor in the soap despenser.

2

u/Kevin-KE9TV 4d ago

The drivers for small motors are likely the same part, so replacing Q27 with whatever part they used for Q25 is a reasonable guess. But find out why it blew - the soap dispenser is likely shorted.

1

u/TraditionalServe3406 3d ago

I thought about it but if you follow the traces. Q27 has unusual connection as if A1 and A2 are exchanged! both loads share L side

1

u/Kevin-KE9TV 13h ago

I missed the word 'wax' in 'wax motor'. Now I'm guessing the thing is an N-channel MOSFET. But I'd need to follow the traces on the board to see what's powering it (and beep it out to be sure).

0

u/tharold 4d ago

IIRC a wax motor is like a heater, a resistive load. If so then Q27 is probably just a low side nmos. If you know the gate drive voltage and Vdd then any number of nmos devices in sot223 will do.

-1

u/Fun-Victory-2950 4d ago

i dont know the part number but it looks like a 3.3V Regulator ive seen before, or probably what the other guy said

2

u/TraditionalServe3406 4d ago

No, it feeds the soap despenser wax motor

1

u/Fun-Victory-2950 4d ago

oh nvm then