samsung dryer control board

[ajshoe]

have a Samsung dryer model #DV45H7000 with no heat. problem is control board - has a bad diode. can't figure out what type of diode it is or what to replace it with. control board is part #DC92-01626B - diode is D18 on board (under magnifying glass looks like W2). If anybody has a replacement that will work - thanks.

[CapLeaker]

Re: samsung dryer control board

something like this?
https://cdn.badcaps-static.com/pdfs/...bb1ad24c2c.pdf

[ajshoe]

Re: samsung dryer control board

Thinking could use a 4007 ? Just tirns on 12v relay.

[CapLeaker]

Re: samsung dryer control board

the 1n4007 isn't high speed switching, but a 1n4148 is.

[ajshoe]

Re: samsung dryer control board

on diode test with volt meter:
D14 open .56V
D18 .24V .24V
D20 open .56V

I'll put a 1n4148 in place and test it. thanks

[budm]

Re: samsung dryer control board

D14 is the snubber diode (1N4007 will do), as you can see, it is connected in parallel with the relay coil.
I cannot see how D14 and D18 are connected in the circuit, if they are also snubber diode for relay coil then 1N 4007 will also work.
BTW, you test these relay coil snubber diode in circuit, you will get false reading due to the DCR of the relay coil which is connected in parallel with the Diode.

[ajshoe]

Re: samsung dryer control board

Turns out that diode D18 is good out of the circuit. Ohms out like a 1n4148

[CapLeaker]

Re: samsung dryer control board

i guess you have to dig deeper... that wasnt it.

[petehall347]

Re: samsung dryer control board

will test bad on board with it being in parallel with the relay coil .

[ajshoe]

Re: samsung dryer control board

hate these control boards ! whole story on this - heater coil relay was bad on board( dryer turned on - tumbled, no heat. after diagnostics, realized the heater relay contacts were bad. took some time but I pried control board out of the plastic shroud that it was "glued or epoxied in" and possibly ruined a trace or twisted the board which could have broke a trace of solder connection. replaced bad relay with new one - now the motor doesn't turn on. That glue was nasty - like rubber cement. I did find a broken trace - repaired it. still no motor turn on. tomorrow - i'll check solder connections around relays.

side note - I have a second (good) control board and with it installed - dryer works perfectly

[sam_sam_sam]

Re: samsung dryer control board

Do you have any voltage on the secondary output capacitors of of the switching power supply board

Because it has a TNY277 it looks like I have found a few of this type of switching power supply regulator going bad or just plan bad

When I see this type of switching power regulator I just replace them if I am having problem with the power supply

[ajshoe]

Re: samsung dryer control board

turns out nothing was wrong with control board except I scratched some traces on board when removing gunk around components. Samsung has some of the worst documentation on their products. turns out there was a contactor broken on the motor contacts. These contacts tell the control board the motor is running and then enables the heater circuit to turn on. anyway - dryer works perfectly now.