Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Troubleshooting Game Consoles & Other Weird Devices
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 03-26-2020, 01:15 PM   #1
ajshoe
ajshoe
 
Join Date: Dec 2012
City & State: cincinnati, ohio 45215
My Country: usa
Line Voltage: 120VAC 60HZ
I'm a: Hobbyist Tech
Posts: 307
Default samsung dryer control board

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.
Attached Images
File Type: jpg 20200326_150117.jpg (819.7 KB, 27 views)
File Type: jpg 20200326_150109.jpg (633.7 KB, 21 views)
File Type: jpg 20200326_150039.jpg (423.3 KB, 17 views)

Last edited by ajshoe; 03-26-2020 at 01:19 PM..
ajshoe is offline   Reply With Quote
Old 03-26-2020, 01:37 PM   #2
CapLeaker
Leaking Member
 
CapLeaker's Avatar
 
Join Date: Dec 2014
City & State: Atlantic Canada
My Country: Canada
Line Voltage: Ground, 0Hz
I'm a: Hobbyist Tech
Posts: 4,480
Default Re: samsung dryer control board

something like this?
https://www.mouser.com/datasheet/2/3...06-1138408.pdf
CapLeaker is offline   Reply With Quote
Old 03-26-2020, 02:15 PM   #3
ajshoe
ajshoe
 
Join Date: Dec 2012
City & State: cincinnati, ohio 45215
My Country: usa
Line Voltage: 120VAC 60HZ
I'm a: Hobbyist Tech
Posts: 307
Default Re: samsung dryer control board

Thinking could use a 4007 ? Just tirns on 12v relay.
ajshoe is offline   Reply With Quote
Old 03-26-2020, 02:47 PM   #4
CapLeaker
Leaking Member
 
CapLeaker's Avatar
 
Join Date: Dec 2014
City & State: Atlantic Canada
My Country: Canada
Line Voltage: Ground, 0Hz
I'm a: Hobbyist Tech
Posts: 4,480
Default Re: samsung dryer control board

the 1n4007 isn't high speed switching, but a 1n4148 is.
CapLeaker is offline   Reply With Quote
Old 03-26-2020, 04:04 PM   #5
ajshoe
ajshoe
 
Join Date: Dec 2012
City & State: cincinnati, ohio 45215
My Country: usa
Line Voltage: 120VAC 60HZ
I'm a: Hobbyist Tech
Posts: 307
Default 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
ajshoe is offline   Reply With Quote
Old 03-26-2020, 04:34 PM   #6
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 37,233
Default 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.
__________________
Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956

Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999

Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl

Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/

TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809

Last edited by budm; 03-26-2020 at 04:36 PM..
budm is offline   Reply With Quote
Old 03-26-2020, 04:48 PM   #7
ajshoe
ajshoe
 
Join Date: Dec 2012
City & State: cincinnati, ohio 45215
My Country: usa
Line Voltage: 120VAC 60HZ
I'm a: Hobbyist Tech
Posts: 307
Default Re: samsung dryer control board

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

Last edited by ajshoe; 03-26-2020 at 04:51 PM..
ajshoe is offline   Reply With Quote
Old 03-26-2020, 05:43 PM   #8
CapLeaker
Leaking Member
 
CapLeaker's Avatar
 
Join Date: Dec 2014
City & State: Atlantic Canada
My Country: Canada
Line Voltage: Ground, 0Hz
I'm a: Hobbyist Tech
Posts: 4,480
Default Re: samsung dryer control board

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

Last edited by CapLeaker; 03-26-2020 at 05:44 PM..
CapLeaker is offline   Reply With Quote
Old 03-26-2020, 06:01 PM   #9
petehall347
Badcaps Veteran
 
Join Date: Jan 2015
City & State: worcester
My Country: United Kingdom
I'm a: Knowledge Seeker
Posts: 2,104
Default Re: samsung dryer control board

will test bad on board with it being in parallel with the relay coil .
petehall347 is offline   Reply With Quote
Old 03-26-2020, 06:17 PM   #10
ajshoe
ajshoe
 
Join Date: Dec 2012
City & State: cincinnati, ohio 45215
My Country: usa
Line Voltage: 120VAC 60HZ
I'm a: Hobbyist Tech
Posts: 307
Default 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

Last edited by ajshoe; 03-26-2020 at 06:21 PM..
ajshoe is offline   Reply With Quote
Old 03-26-2020, 07:13 PM   #11
sam_sam_sam
Badcaps Veteran
 
Join Date: Jul 2011
City & State: Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 1,947
Default 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
__________________
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *


These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board

All of these had CAPs POOF
All of the mosfet that are taken out by bad caps
sam_sam_sam is offline   Reply With Quote
Old 04-06-2020, 03:46 PM   #12
ajshoe
ajshoe
 
Join Date: Dec 2012
City & State: cincinnati, ohio 45215
My Country: usa
Line Voltage: 120VAC 60HZ
I'm a: Hobbyist Tech
Posts: 307
Default 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.
ajshoe is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums 2003 - 2020
Powered by vBulletin ®
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 11:18 AM.
Did you find this forum helpful?