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 01-19-2015, 12:44 PM   #241
selldoor
Slow Learner
 
selldoor's Avatar
 
Join Date: Dec 2010
City & State: Lancashire UK
Posts: 7,853
Default Re: Help with Motor Control Board

Watching videos is fine but you need to do some as well?
selldoor is offline   Reply With Quote
Old 01-19-2015, 04:14 PM   #242
Crrose
Senior Member
 
Join Date: Dec 2013
City & State: Brea ca
My Country: Usa
I'm a: Knowledge Seeker
Posts: 149
Default Re: Help with Motor Control Board

Need to get some old circuit boards to mess with. Checking craigslist for free electronics.
Crrose is offline   Reply With Quote
Old 01-24-2015, 11:48 PM   #243
keeney123
Lauren
 
Join Date: Sep 2014
City & State: North Adams MA
My Country: United States
Line Voltage: 120VAC, 60Hz
I'm a: Knowledge Seeker
Posts: 2,086
Default Re: Help with Motor Control Board

How the soldering experiment coming along?
keeney123 is offline   Reply With Quote
Old 01-26-2015, 11:43 AM   #244
Crrose
Senior Member
 
Join Date: Dec 2013
City & State: Brea ca
My Country: Usa
I'm a: Knowledge Seeker
Posts: 149
Default Re: Help with Motor Control Board

Very tedious and difficult. Small resistors and caps are ok since it's one leg at a time but doing SMDs very difficult. Looking for a cheap hot air gun or how to make one. Still waiting for parts to arrive, apparently they are shipped from china. Got the small TC1410 from Mouser but couldn't find the W33n20 anywhere else.
Crrose is offline   Reply With Quote
Old 01-27-2015, 10:02 PM   #245
keeney123
Lauren
 
Join Date: Sep 2014
City & State: North Adams MA
My Country: United States
Line Voltage: 120VAC, 60Hz
I'm a: Knowledge Seeker
Posts: 2,086
Default Re: Help with Motor Control Board

To desolder the SMD could you not just cut the legs of the bad SMD and desolder them one at a time? They also make a low temp solder that you could add the the solder on the SMD and that will lower the melting point of the present solder on the SMD so you can heat all the pins of the SMD and before they cool down below the lower melting point you would be able to remove the SMD and then go over the pads with solder wick to clean them up.
To solder the SMD one has to first tack it down on two opposing corners then it is also, good to use a hoof tip that has a little reservoir for solder. You would put flux down and put a little solder in the tip of the iron and then drag the iron on the outside of the pins making contact with the pad and pin at the same time and only adding a little solder if needed. You would start at the opposite side of the pins you tacked down.

Last edited by keeney123; 01-27-2015 at 10:03 PM.. Reason: correction
keeney123 is offline   Reply With Quote
Old 01-31-2015, 02:54 PM   #246
Crrose
Senior Member
 
Join Date: Dec 2013
City & State: Brea ca
My Country: Usa
I'm a: Knowledge Seeker
Posts: 149
Default Re: Help with Motor Control Board

Just and update on status, still waiting for parts from china.
Crrose is offline   Reply With Quote
Old 02-04-2015, 12:42 PM   #247
Crrose
Senior Member
 
Join Date: Dec 2013
City & State: Brea ca
My Country: Usa
I'm a: Knowledge Seeker
Posts: 149
Default Re: Help with Motor Control Board

Well I replaced the TC1410 chip and the W33N20 mosfet, turned treadmill on and motor no longer started on its own at high speed which was good news, but, it acted like it was prior to me shorting out the mosfet. After maybe a minute the W33N20 popped and spit out some smoke underneath the board and shorted out.
Crrose is offline   Reply With Quote
Old 02-04-2015, 02:59 PM   #248
Agent24
I see dead caps
 
Agent24's Avatar
 
Join Date: Oct 2007
City & State: Hiding inside a plated-through hole
My Country: New Zealand
Line Voltage: 230VAC 50Hz
I'm a: Hobbyist Tech
Posts: 4,652
Default Re: Help with Motor Control Board

Bummer. Sounds like something else is still wrong causing the MOSFET to blow.
__________________
"Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHorn
Agent24 is offline   Reply With Quote
Old 02-04-2015, 03:20 PM   #249
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: 39,043
Default Re: Help with Motor Control Board

Quote:
Originally Posted by Crrose View Post
Well I replaced the TC1410 chip and the W33N20 mosfet, turned treadmill on and motor no longer started on its own at high speed which was good news, but, it acted like it was prior to me shorting out the mosfet. After maybe a minute the W33N20 popped and spit out some smoke underneath the board and shorted out.
The motor is connected in series with the MOSFET, if it shorted out the motor would have been running full speed (MOSFET is basically connected in series with the motor).
Are you sure everything is connected properly, and the soldering works are good?
__________________
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
budm is offline   Reply With Quote
Old 02-04-2015, 03:49 PM   #250
Crrose
Senior Member
 
Join Date: Dec 2013
City & State: Brea ca
My Country: Usa
I'm a: Knowledge Seeker
Posts: 149
Default Re: Help with Motor Control Board

I bought extra so will try to redo it one more time and see what happens. Bought 3 TC chips but for some reason only 2 of the other mosfets.
Crrose is offline   Reply With Quote
Old 02-04-2015, 04:04 PM   #251
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: 39,043
Default Re: Help with Motor Control Board

Let us see the pictures after the parts installation first.
budm is offline   Reply With Quote
Old 02-04-2015, 04:04 PM   #252
goontron
5000!
 
goontron's Avatar
 
Join Date: Dec 2011
City & State: South Greeley, Wyoming
My Country: US
Line Voltage: 13.9kv HT service and some 240v center tap oddity.
I'm a: Professional Tech
Posts: 4,029
Default Re: Help with Motor Control Board

by any chance to the braking resistors get hot when its running? the relay might not be dropping out.
__________________
Things I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....

"Dude, this is Wyoming, i hopped on and sent 'er. No fucking around." -- Me

Excuse me while i do something dangerous


You must have a sad, sad boring life if you hate on people harmlessly enjoying life with an animal costume.

Sometimes you need to break shit to fix it.... Thats why my lawnmower doesn't have a deadman switch or engine brake anymore

Tomorrow Is Nearly Yesterday And Everyday Is Stupid!
goontron is offline   Reply With Quote
Old 02-04-2015, 05:06 PM   #253
Crrose
Senior Member
 
Join Date: Dec 2013
City & State: Brea ca
My Country: Usa
I'm a: Knowledge Seeker
Posts: 149
Default Re: Help with Motor Control Board

Quote:
Originally Posted by goontron View Post
by any chance to the braking resistors get hot when its running? the relay might not be dropping out.
What are the braking resistors?

And yes I will post pictures of board with new pieces on.
Crrose is offline   Reply With Quote
Old 01-26-2018, 12:23 PM   #254
80wa7113
New Member
 
Join Date: Jan 2018
City & State: Indianapolis, IN
My Country: USA
I'm a: Knowledge Seeker
Posts: 2
Default Re: Help with Motor Control Board

Hi Crrose,

I realize this thread is almost a couple of years old, but, did you ever get this issue resolved? I found your thread while doing research for the exact same problem I'm having with yet another failed MC70 motor control board...no motor start with a burned board at DZ4A/B.

Regards,

Dave
80wa7113 is offline   Reply With Quote
Old 01-31-2018, 06:41 PM   #255
80wa7113
New Member
 
Join Date: Jan 2018
City & State: Indianapolis, IN
My Country: USA
I'm a: Knowledge Seeker
Posts: 2
Default Re: Help with Motor Control Board

Well, there was just going to be NO fixing this board. I replaced my fried zener diode (DZ4) and also replaced the other DZ4 as well as DZ2 and the accompanying resistor with no luck. Without a schematic it is next to impossible to properly diagnose the failing component. Searches of the internet only came up with guys who repair the boards...BUT I also found a company called Gemini Controls out of Wisc. who makes the latest generation of PWM's to fix these DOA treadmills. Their NEW board was $149.00 - about $10 more than having this one repaired. I opted for new with a thin price difference like that.

Installed the new board and we're up and running again!

Old board heading to the landfill....
80wa7113 is offline   Reply With Quote
Old 01-13-2020, 02:52 PM   #256
4umfreak
New Member
 
Join Date: Jan 2020
City & State: Victoria, BC
My Country: Canada
I'm a: Knowledge Seeker
Posts: 1
Default Re: Help with Motor Control Board

Hey all, Again this old thread was helpful for me getting my MC70 treadmill motor control board running.

For future individuals looking to repair their boards, here's what I replaced:

1x 24v 5W zener diode
1x 15v 1.3W zener diode
1x 1N4007 rectifier diode (general purpose)
1x 1K 10W ceramic resistor

I had to bridge / repair the fried traces on *both* sides of the 24v zener diode. I simply used leads from a spare 1N4007 that was handy.

The zener diodes were easy to spot & the resistor was replaced as a preventative measure. Mine was showing evidence of overheating with a white-ish color.

The 1N4007 is the one at the end of the 1K resistor, where the AC connection is made. In my case, it looked ok but tested bad and was something I had on hand, so replacing it was an easy choice. Without replacing this diode - the board appeared to be completely dead.

After replacing the above components, I cleaned off the old thermal paste and installed a thin coating of new paste.

I hope someone finds this information helpful. My repair cost less than $20 CAD, plus shipping.

Cheers,
-Mark
4umfreak is offline   Reply With Quote
Old 11-24-2020, 02:32 PM   #257
ken1415
New Member
 
Join Date: Nov 2020
City & State: West Chester
My Country: United States
I'm a: Knowledge Seeker
Posts: 1
Default Re: Help with Motor Control Board

Quote:
Originally Posted by 4umfreak View Post
Hey all, Again this old thread was helpful for me getting my MC70 treadmill motor control board running.

For future individuals looking to repair their boards, here's what I replaced:

1x 24v 5W zener diode
1x 15v 1.3W zener diode
1x 1N4007 rectifier diode (general purpose)
1x 1K 10W ceramic resistor

I had to bridge / repair the fried traces on *both* sides of the 24v zener diode. I simply used leads from a spare 1N4007 that was handy.

The zener diodes were easy to spot & the resistor was replaced as a preventative measure. Mine was showing evidence of overheating with a white-ish color.

The 1N4007 is the one at the end of the 1K resistor, where the AC connection is made. In my case, it looked ok but tested bad and was something I had on hand, so replacing it was an easy choice. Without replacing this diode - the board appeared to be completely dead.

After replacing the above components, I cleaned off the old thermal paste and installed a thin coating of new paste.

I hope someone finds this information helpful. My repair cost less than $20 CAD, plus shipping.

Cheers,
-Mark
Mark - can you give the locations of the components you replaced?

1x 24v 5W zener diode
1x 15v 1.3W zener diode
1x 1N4007 rectifier diode (general purpose)
1x 1K 10W ceramic resistor
ken1415 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 - 2021
Powered by vBulletin ®
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 06:15 PM.
Did you find this forum helpful?