UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > Components and Circuits

Notices

Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

Closed Thread
 
Thread Tools
Old 17th May 2023, 4:11 pm   #1
John_BS
Octode
 
John_BS's Avatar
 
Join Date: Dec 2008
Location: Wincanton, Somerset, UK.
Posts: 1,757
Default Mystery SM component

I have an HP lap-top PSU which was switched on when wet.

A component at the heart of the problem is labeled 'BC2'. All the other comp loc references are normal R1 /C2 etc. Does anyone know what this might be? It's close to black in colour.
Attached Thumbnails
Click image for larger version

Name:	HP PSU.jpg
Views:	213
Size:	110.3 KB
ID:	278365  
John_BS is offline  
Old 17th May 2023, 5:45 pm   #2
high_vacuum_house
Octode
 
high_vacuum_house's Avatar
 
Join Date: May 2003
Location: Belper Derbyshire
Posts: 1,910
Default Re: Mystery SM component

Looks to me like a surface mount inductor as the Matt dark grey colour quite closely resembles a ferrite core. What is its resistance? If quite low then definitely an inductor.

Christopher Capener
__________________
Interests in the collection and restoration of Tefifon players and 405 line television
high_vacuum_house is offline  
Old 17th May 2023, 6:22 pm   #3
Jon_G4MDC
Nonode
 
Jon_G4MDC's Avatar
 
Join Date: Nov 2015
Location: Welwyn Garden City, Hertfordshire, UK.
Posts: 2,013
Default Re: Mystery SM component

See Murata BLM inductors. It certainly resembles one.
Jon_G4MDC is offline  
Old 17th May 2023, 6:32 pm   #4
Radio Wrangler
Moderator
 
Radio Wrangler's Avatar
 
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,801
Default Re: Mystery SM component

probably a surface mount ferrite bead in a power rail filter.

David
__________________
Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
Radio Wrangler is offline  
Old 18th May 2023, 4:48 pm   #5
John_BS
Octode
 
John_BS's Avatar
 
Join Date: Dec 2008
Location: Wincanton, Somerset, UK.
Posts: 1,757
Default Re: Mystery SM component

Thanks for the feedback everyone: I think you're spot on with the SM chip ferrite inductor. It's OC, and a series resistor is v unhappy. I suspect the switching FET has gone s/c.
John_BS is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 3:24 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.