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Old 12-14-2020, 01:40 PM   #1
ajshoe
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Default Whirlpool dryer control bd

Have a whirlpool duet control board - part #3978918. Also wp8546219. Does anybody recognize what this SMD transistor is ? Also the 2 diodes ?
xsistor reads R58 P1F
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Last edited by ajshoe; 12-14-2020 at 01:51 PM..
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Old 12-14-2020, 02:55 PM   #2
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Default Re: Whirlpool dryer control bd

You will have to clean up the diodes with some acetone and then play with your camera or phone by taking photos at different angles to be able to see what markings are on them. Budm can tell us more about the transistor or regulator of whatever it is.
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Old 12-14-2020, 03:02 PM   #3
ajshoe
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Default Re: Whirlpool dryer control bd

thanks, wasn't sure what to use to get that protectant off.
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Old 12-14-2020, 03:10 PM   #4
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Default Re: Whirlpool dryer control bd

3rd pic i see a cracked solder joint .it might be the problem
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Old 12-14-2020, 04:34 PM   #5
R_J
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Default Re: Whirlpool dryer control bd

The transistor is an Onsemi PZT2222AT1, Petehall347 is correct about the poor solder connection, I would check all the larger connections for similar poor solder connections. It might be better to post the actual problem you are having.

Last edited by R_J; 12-14-2020 at 04:38 PM..
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Old 12-14-2020, 08:28 PM   #6
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Default Re: Whirlpool dryer control bd

thats cracked for sure.
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Old 12-14-2020, 08:50 PM   #7
ron350
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Default Re: Whirlpool dryer control bd

Yes
That bad solder joint belongs to K1 heater relay.
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Old 12-14-2020, 09:48 PM   #8
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Default Re: Whirlpool dryer control bd

I see bad solder joint in pic - unfortunately I have 2 boards - one works - other has burnt relay, trans, and maybe diodes. check in morning.
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Old 12-16-2020, 05:25 PM   #9
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Default Re: Whirlpool dryer control bd

looked at both boards - the one that heater relay is burnt - solder joints were good. The good board which I installed and ran 2 loads of clothes was bad but it worked liked that for 2 loads. Fixed solder joints - still works ! waiting on PZT2222AT1 and diodes to repair burnt board. want to thank all who replied - didn't see cold solder joint, I'm pretty sure it would have failed in the near future !

Last edited by ajshoe; 12-16-2020 at 06:34 PM..
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