English Amiga Board


Go Back   English Amiga Board > Support > support.Hardware

 
 
Thread Tools
Old 07 May 2009, 16:45   #1
chiark
Needs a life

chiark's Avatar
 
Join Date: Jan 2008
Location: England
Posts: 1,689
Name that SMD component! (Help with a CV64/3D scandoubler)

Ladies and Gents, I could do with help from someone a little more experienced than me in SMD stuff!

The CV3D scandoubler that I've bought works temprementally - it needed bending in order to show a picture, which suggested to me a broken connector or dry joint.

Having checked, there's a largeish (for an SMD!) black lump with silver ends that has no continuity across it unless you bend the board, which sorta suggests it's knackered. I'm guessing that there's an internal crack in it.

i've removed it from the board, and it came off in 2 pieces despite being exceptionally careful, so I think it was cracked.

Question: is this a simple bridge, or is it more likely to be a ferrite bead of some sort or another? I'm guessing it's a ferrite to remove noise above certain frequencies...

Next question: is there any way to tell what sort of ferrite it might be??? There's two others on the board which suggests to me it might be in the RGB path.



It's the device on the bottom of the board, just above and to the right of the end of the edge connector...

Clues? Thanks!
chiark is offline  
Old 07 May 2009, 16:54   #2
TheCorfiot
Amibay Senior Staff
TheCorfiot's Avatar
 
Join Date: Feb 2008
Location: Cardiff / Wales
Posts: 1,302
Nick

It does seem like a ferrite bead more than likely included to comply with EMI & RF regulations..

Simply short the pads mate... Job done.

TC
TheCorfiot is offline  
Old 07 May 2009, 17:11   #3
chiark
Needs a life

chiark's Avatar
 
Join Date: Jan 2008
Location: England
Posts: 1,689
Tell you the truth, that's what I have done already and the only thing stopping me from powering it up is the lack of a new PCB mount 15 way VGA connector . Ordering bits from Farnell as I type

I then had a slight crisis of conscience - what if it turned out to be something else and critical...

Thanks for the confirmation/thoughts. I'll whack the new connector on when it gets here and let you know!
chiark is offline  
Old 07 May 2009, 17:33   #4
Shadowfire
Registered User
Shadowfire's Avatar
 
Join Date: Aug 2001
Location: Connecticut USA
Posts: 602
Could be a ferrite core or a capacitor.
EDIT: Based on your description, probably a ferrite core.
Shadowfire is offline  
Old 08 May 2009, 03:12   #5
Smiley
Amiga-less!
Smiley's Avatar
 
Join Date: Feb 2005
Location: UK
Posts: 1,350
Sounds like you need to do the xbox360 oven trick or towel trick





Nah I kid.
Smiley is offline  
Old 08 May 2009, 09:32   #6
Loedown
Precious & fragile things

 
Join Date: Feb 2009
Location: Victoria, Australia
Posts: 1,946
Greetings,
The object just above the one you refer too *looks* identical, test it using a multimeter, it should read almost dead short, if so, then it's most likely to be a ferrite bead as previously stated.

If someone else has one and can do a test for you to determine if it is or isn't, that would be better again.

Paul
Loedown is offline  
Old 08 May 2009, 09:44   #7
chiark
Needs a life

chiark's Avatar
 
Join Date: Jan 2008
Location: England
Posts: 1,689
Indeed.

Hence the question

However, I believe CV64/3D scandoubler modules are quite rare, unfortunately...
chiark is offline  
Old 08 May 2009, 11:09   #8
Loedown
Precious & fragile things

 
Join Date: Feb 2009
Location: Victoria, Australia
Posts: 1,946
I believe Amigans are quite rare, but helpful

Paul
Loedown is offline  
Old 08 May 2009, 12:06   #9
chiark
Needs a life

chiark's Avatar
 
Join Date: Jan 2008
Location: England
Posts: 1,689
Very good point, and well made
chiark is offline  
Old 08 May 2009, 21:35   #10
chiark
Needs a life

chiark's Avatar
 
Join Date: Jan 2008
Location: England
Posts: 1,689
Well, I nipped into Farnells on the way home and picked up the VGA connectors...

I'd shorted across the ferrite bead/fuse/whatever the mystery thing is, and with small trepidation powered it up.

SUCCESS! Perfect!

chiark is offline  
 


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Missing SMD component on Apollo 1240 8bitbubsy support.Hardware 11 21 October 2010 05:05
CV64 problem bebek support.Hardware 6 01 October 2010 17:41
Repairing CV64/3D Scandoubler ? snowman040 support.Hardware 6 30 April 2008 00:26
Is the Comp Serv Scandoubler (also Arxon) a full 24bit AGA scandoubler? keropi support.Hardware 11 03 August 2006 13:06
[FA] VERY RARE : Scandoubler CV64 scan_x MarketPlace 0 02 January 2004 12:14

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


All times are GMT +2. The time now is 13:12.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Page generated in 0.09288 seconds with 13 queries