NEW MFW-15 amps (May 2010) *pics* - Page 40 - AVS Forum
Forum Jump: 
 18Likes
Reply
 
Thread Tools
post #1171 of 2639 Old 10-29-2010, 07:50 PM
Newbie
 
R_Johnson's Avatar
 
Join Date: Aug 2006
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Quote:
Originally Posted by NicksHitachi View Post

You might have a loose high level driver lead, pull driver and amp and check red black wires from amp to driver.

If this doesn't work ill sell you a v3.0 for $300.00.

I checked all the connections and they seemed tight. Put in the replacement fuse which blew immediately (without even turning it on; just plugging it in took it out).
R_Johnson is offline  
Sponsored Links
Advertisement
 
post #1172 of 2639 Old 10-30-2010, 04:54 AM
Advanced Member
 
Sepen's Avatar
 
Join Date: Feb 2001
Location: Rochester, NY
Posts: 711
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 17
Quote:
Originally Posted by R_Johnson View Post

I checked all the connections and they seemed tight. Put in the replacement fuse which blew immediately (without even turning it on; just plugging it in took it out).

PM Murrel, he may be able to help.
Sepen is online now  
post #1173 of 2639 Old 10-30-2010, 05:13 AM
AVS Addicted Member
 
JimP's Avatar
 
Join Date: Sep 2002
Location: Wetumpka, AL
Posts: 15,291
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 67 Post(s)
Liked: 179
Quote:
Originally Posted by R_Johnson View Post

I checked all the connections and they seemed tight. Put in the replacement fuse which blew immediately (without even turning it on; just plugging it in took it out).

I had a similar problem with my brother's MFW-15.

In his case, the driver and the amp had both gone bad.

Try pushing on the driver to verify that it still moves. It'll take more than a light push but don't overdo it either.

If the driver is bad, you might want to rethink your solution.

Samsung 64F8500, Panasonic 65VT50, Oppo 95, Tivo Roamio for OTA, Dish VIP722, Marantz AV8801 preamp, Rotel Amps, Atlantic Tech 8200 speakers, Seaton Submersive HP, Calman 5, Chromapure, Accupel DVG-5000, i1Display3pro, i1pro2, eecolor colorbox.
JimP is online now  
post #1174 of 2639 Old 11-02-2010, 04:00 AM
Advanced Member
 
Sepen's Avatar
 
Join Date: Feb 2001
Location: Rochester, NY
Posts: 711
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 17
Quote:
Originally Posted by Sepen View Post

My amp went from a slight hum to a massive one, and I got no output either. Talked with Murrel and sent it to him to be fixed. V2 btw. Will let everyone know how it goes. Was thinking of the Turbo but my grandson has grown 2" since it was last in stock.

I got back the part from Murrel yesterday and put it back in my amp, works perfectly, no hum at all. 6 days turnaround from NY to CO via Priority mail. He knows his stuff.
Sepen is online now  
post #1175 of 2639 Old 11-02-2010, 05:02 AM
AVS Special Member
 
NicksHitachi's Avatar
 
Join Date: Jul 2007
Location: Wilmington, NC
Posts: 3,487
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 37 Post(s)
Liked: 102
Quote:
Originally Posted by Sepen View Post


I got back the part from Murrel yesterday and put it back in my amp, works perfectly, no hum at all. 6 days turnaround from NY to CO via Priority mail. He knows his stuff.

Is this repair a solution or a band aid?

Murrel,

Is this piece upgraded to be more reliable? If so pm me how much to upgrade them I have a couple I might do.......

Don't waste time reading signatures.....
NicksHitachi is online now  
post #1176 of 2639 Old 11-02-2010, 05:34 AM
Senior Member
 
murrel's Avatar
 
Join Date: Aug 2009
Location: Longmont, Colorado
Posts: 399
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 14
Quote:
Originally Posted by Sepen View Post

I got back the part from Murrel yesterday and put it back in my amp, works perfectly, no hum at all. 6 days turnaround from NY to CO via Priority mail. He knows his stuff.

Thanks Sam!

I am glad you are back up and running.

Murrel

Murrel J Gray
 

murrel is offline  
post #1177 of 2639 Old 11-02-2010, 05:41 AM
Advanced Member
 
centauro74's Avatar
 
Join Date: Jun 2007
Location: New Jersey
Posts: 603
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 13
Quote:
Originally Posted by Sepen View Post


I got back the part from Murrel yesterday and put it back in my amp, works perfectly, no hum at all. 6 days turnaround from NY to CO via Priority mail. He knows his stuff.

Sepen, does the amp still gets really hot when in standby and in use after the repair?.
I probably will send mine to Murrel, mine was working great until the crazy ummm noice stared.

centauro74 is online now  
post #1178 of 2639 Old 11-02-2010, 05:51 AM
Senior Member
 
murrel's Avatar
 
Join Date: Aug 2009
Location: Longmont, Colorado
Posts: 399
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 14
Quote:
Originally Posted by centauro74 View Post

Sepen, does the amp still gets really hot when in standby and in use after the repair?.
I probably will send mine to Murrel, mine was working great until the crazy ummm noice stared.

It will still run very warm.....Only way to fix that right now is to purchase a V3.

This only alleviates the hum.



Murrel

Murrel J Gray
 

murrel is offline  
post #1179 of 2639 Old 11-02-2010, 06:44 AM
Member
 
CaseyGT's Avatar
 
Join Date: Aug 2005
Posts: 21
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Quote:
Originally Posted by murrel View Post

It will still run very warm.....Only way to fix that right now is to purchase a V3.

This only alleviates the hum.



Murrel

And is this a problem Murrel? I know this has been covered in the pages and pages of discussion, but I don't remember the outcome. Should I unplug the amp after usage, or just let it go into standby?

My caps should be here today, and hopefully my amp fixed tonight. I'll let you know how it goes. thanks so much for your assistance.

Casey
CaseyGT is offline  
post #1180 of 2639 Old 11-02-2010, 06:57 AM
Advanced Member
 
centauro74's Avatar
 
Join Date: Jun 2007
Location: New Jersey
Posts: 603
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 13
Quote:
Originally Posted by murrel View Post

It will still run very warm.....Only way to fix that right now is to purchase a V3.

This only alleviates the hum.



Murrel

Murrel about that, it's this cured definitely or the ummm noise may come back?
If the fix is permanent then is wort the investment in the fix, if not then it's better to get a new amp.

centauro74 is online now  
post #1181 of 2639 Old 11-02-2010, 07:30 AM
Senior Member
 
murrel's Avatar
 
Join Date: Aug 2009
Location: Longmont, Colorado
Posts: 399
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 14
Quote:
Originally Posted by CaseyGT View Post

And is this a problem Murrel? I know this has been covered in the pages and pages of discussion, but I don't remember the outcome. Should I unplug the amp after usage, or just let it go into standby?

My caps should be here today, and hopefully my amp fixed tonight. I'll let you know how it goes. thanks so much for your assistance.

Casey

I would say it is a problem..leave your amp on it is the onrush that usually causes the boards to fail.

There is no real outcome as it is a design problem. The V3 uses the same transformer but the preamp,power supply and output board is completely redesigned and runs very cool.

And Casey you are welcome!

Murrel

Murrel J Gray
 

murrel is offline  
post #1182 of 2639 Old 11-02-2010, 07:32 AM
Senior Member
 
murrel's Avatar
 
Join Date: Aug 2009
Location: Longmont, Colorado
Posts: 399
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 14
Quote:
Originally Posted by centauro74 View Post

Murrel about that, it's this cured definitely or the ummm noise may come back?
If the fix is permanent then is wort the investment in the fix, if not then it's better to get a new amp.

Only time will tell and I cant say which is better for you to do. Only 2 months in with this fix and none have come back yet.

Murrel

Murrel J Gray
 

murrel is offline  
post #1183 of 2639 Old 11-02-2010, 08:58 AM
AVS Special Member
 
NicksHitachi's Avatar
 
Join Date: Jul 2007
Location: Wilmington, NC
Posts: 3,487
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 37 Post(s)
Liked: 102
Quote:
Originally Posted by murrel View Post


Only time will tell and I cant say which is better for you to do. Only 2 months in with this fix and none have come back yet.

Murrel

You sir get props!!

Maybe restore some rep for the folks in Longont......

Don't waste time reading signatures.....
NicksHitachi is online now  
post #1184 of 2639 Old 11-02-2010, 09:23 AM
Senior Member
 
murrel's Avatar
 
Join Date: Aug 2009
Location: Longmont, Colorado
Posts: 399
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 14
Quote:
Originally Posted by NicksHitachi View Post

You sir get props!!

Maybe restore some rep for the folks in Longont......

Thanks NicksHitachi

Murrel

Murrel J Gray
 

murrel is offline  
post #1185 of 2639 Old 11-03-2010, 06:24 AM
Member
 
CaseyGT's Avatar
 
Join Date: Aug 2005
Posts: 21
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Quote:
Originally Posted by CaseyGT View Post

My caps should be here today, and hopefully my amp fixed tonight. I'll let you know how it goes. thanks so much for your assistance.

Casey

IT'S ALIVE!!!!! and without a hum. My theater walls were shakin' . Thanks again.
CaseyGT is offline  
post #1186 of 2639 Old 11-03-2010, 06:37 AM
AVS Special Member
 
NicksHitachi's Avatar
 
Join Date: Jul 2007
Location: Wilmington, NC
Posts: 3,487
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 37 Post(s)
Liked: 102
Quote:
Originally Posted by CaseyGT View Post

IT'S ALIVE!!!!! and without a hum. My theater walls were shakin' . Thanks again.

What did you replace?, Just the Caps? What was the total cost?

Don't waste time reading signatures.....
NicksHitachi is online now  
post #1187 of 2639 Old 11-03-2010, 07:09 AM
Senior Member
 
murrel's Avatar
 
Join Date: Aug 2009
Location: Longmont, Colorado
Posts: 399
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 14
Quote:
Originally Posted by CaseyGT View Post

IT'S ALIVE!!!!! and without a hum. My theater walls were shakin' . Thanks again.

Casey,

Great news! Enjoy

Murrel

Murrel J Gray
 

murrel is offline  
post #1188 of 2639 Old 11-03-2010, 08:26 AM
Member
 
CaseyGT's Avatar
 
Join Date: Aug 2005
Posts: 21
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
NH - As I pulled a few of the caps off, they were clearly swollen or ruptured. replacing the 4 as instructed by Murrel, cost about 3 bucks in parts and 8 dollars in shipping from parts-express. I'm not sure how Murrel feels about me handing out specifics about this repair, so I would suggest PMing him for details.
CaseyGT is offline  
post #1189 of 2639 Old 11-03-2010, 09:12 AM
AVS Addicted Member
 
Chu Gai's Avatar
 
Join Date: Sep 2002
Location: NYC area
Posts: 14,728
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 121 Post(s)
Liked: 418
Any thoughts as to why the new caps will not suffer the same fate as the ones replaced?

"I've found that when you want to know the truth about someone that someone is probably the last person you should ask." - Gregory House
Chu Gai is online now  
post #1190 of 2639 Old 11-03-2010, 09:15 AM
Senior Member
 
murrel's Avatar
 
Join Date: Aug 2009
Location: Longmont, Colorado
Posts: 399
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 14
Quote:
Originally Posted by CaseyGT View Post

NH - As I pulled a few of the caps off, they were clearly swollen or ruptured. replacing the 4 as instructed by Murrel, cost about 3 bucks in parts and 8 dollars in shipping from parts-express. I'm not sure how Murrel feels about me handing out specifics about this repair, so I would suggest PMing him for details.

Casey,

You can post anything you want.........but I have had many people try to do the fix and destroy the board. And there are no spares to speak of. So if a person is not adept at removing and installing parts then I suggest they don't try to do the repair themselves.

Murrel

Murrel J Gray
 

murrel is offline  
post #1191 of 2639 Old 11-03-2010, 09:16 AM
Member
 
CaseyGT's Avatar
 
Join Date: Aug 2005
Posts: 21
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
From the sound of it, we have no guarantee that they won't also fail. But for 12 dollars, It's a fine temporary solution for me. In addition, the failing caps were replaced with higher voltage units. typically this will allow for a bit more head room.

Understood, Murrel. I wouldn't want that hanging over my head either
CaseyGT is offline  
post #1192 of 2639 Old 11-03-2010, 09:19 AM
Senior Member
 
murrel's Avatar
 
Join Date: Aug 2009
Location: Longmont, Colorado
Posts: 399
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 14
Quote:
Originally Posted by Chu Gai View Post

Any thoughts as to why the new caps will not suffer the same fate as the ones replaced?

Not saying they wont and never have in fact I have always stated this may be a temporary fix. But I have suggested increasing the voltage and temp ratings on the caps.

Murrel

Murrel J Gray
 

murrel is offline  
post #1193 of 2639 Old 11-03-2010, 09:22 AM
Senior Member
 
murrel's Avatar
 
Join Date: Aug 2009
Location: Longmont, Colorado
Posts: 399
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 14
Quote:
Originally Posted by CaseyGT View Post

From the sound of it, we have no guarantee that they won't also fail. But for 12 dollars, It's a fine temporary solution for me. In addition, the failing caps were replaced with higher voltage units. typically this will allow for a bit more head room.

Understood, Murrel. I wouldn't want that hanging over my head either

All good Casey. I am glad you are up and running. And yes as this may be a temporary fix it at least gives folks a option or time to decide whether they want a V3 or to wait for Kevin's solution. Only time will tell how long this lasts.

Murrel

Murrel J Gray
 

murrel is offline  
post #1194 of 2639 Old 11-03-2010, 12:00 PM
Member
 
CaseyGT's Avatar
 
Join Date: Aug 2005
Posts: 21
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Here is Murrel's instructions, updated by me slightly, for fixing the hum issues with the v2 Amp.


The parts needed for the fix. If these links aren't legal by forum standards, let me know and I will removed them.
1 x 22uF 160v

2 x 470uF 35V

1 x 1000uF 35v

 

MFW15v2 HumFix.doc 69k . file
Attached Files
File Type: doc MFW15v2 HumFix.doc (69.0 KB, 205 views)
CaseyGT is offline  
post #1195 of 2639 Old 11-03-2010, 12:38 PM
AVS Special Member
 
NicksHitachi's Avatar
 
Join Date: Jul 2007
Location: Wilmington, NC
Posts: 3,487
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 37 Post(s)
Liked: 102
Looks good, why not upgrade the main caps while your at it?

Don't waste time reading signatures.....
NicksHitachi is online now  
post #1196 of 2639 Old 11-03-2010, 12:49 PM
Senior Member
 
murrel's Avatar
 
Join Date: Aug 2009
Location: Longmont, Colorado
Posts: 399
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 14
Quote:
Originally Posted by NicksHitachi View Post

Looks good, why not upgrade the main caps while your at it?

You could if you wanted to but I have only seen them fail when you have a major short in the output section

Murrel J Gray
 

murrel is offline  
post #1197 of 2639 Old 11-03-2010, 02:14 PM
Senior Member
 
murrel's Avatar
 
Join Date: Aug 2009
Location: Longmont, Colorado
Posts: 399
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 14
Quote:
Originally Posted by CaseyGT View Post

Here is Murrel's instructions, updated by me slightly, for fixing the hum issues with the v2 Amp.


The parts needed for the fix. If these links aren't legal by forum standards, let me know and I will removed them.
1 x 22uF 160v

2 x 470uF 35V

1 x 1000uF 35v

Nice job Casey!

Murrel

Murrel J Gray
 

murrel is offline  
post #1198 of 2639 Old 11-03-2010, 02:24 PM
Newbie
 
todd pellowe's Avatar
 
Join Date: Aug 2008
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
For $8.38 shipped USPS priority, I've got to give this a shot... Thanks a ton Murrell.
todd pellowe is offline  
post #1199 of 2639 Old 11-03-2010, 04:03 PM
Member
 
heterology's Avatar
 
Join Date: Nov 2005
Posts: 47
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Wow, great info - just wish I still had my v2 amp as it was sent in under warranty right before they shut the doors!
heterology is offline  
post #1200 of 2639 Old 11-03-2010, 04:05 PM
Senior Member
 
murrel's Avatar
 
Join Date: Aug 2009
Location: Longmont, Colorado
Posts: 399
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 14
Quote:
Originally Posted by heterology View Post

Wow, great info - just wish I still had my v2 amp as it was sent in under warranty right before they shut the doors!

Are you completely without a amp?

Murrel J Gray
 

murrel is offline  
Reply Subwoofers, Bass, and Transducers

Tags
Amplifier Speaker

User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off