Jump to content
Sign in to follow this  
Airshack

Squealing Like a Pig, No Video, Repair?

Recommended Posts

I have a 99/4A which squeals like a pig when I turn it on. Loud constant tone — no video output.

 

Any known solutions? 

 

Do we have any known service manuals scanned for the 4A? 

 

 

Share this post


Link to post
Share on other sites

Thanks! I guess that’s a good start for all of these old machines. One technique I’ve seen is piggy-backing the RAM to check for open-failures. If that doesn’t work I’ll be pulling RAM and adding sockets one by one.

Share this post


Link to post
Share on other sites

My understanding is that bad RAM usually results in garbled screen with colors upon startup. I’m getting no video at all — black.

Edited by Airshack

Share this post


Link to post
Share on other sites

Some tips for the "black screen with noise" issue at the following blog post:

 

 

The blogpost references John Guion's guide to troubleshooting.  I had posted a comment in the blogpost linking to the full text of the guide at whtech.  The comment was never approved, so is invisible.  

 

I post the link here for your reference.

http://ftp.whtech.com/articles/limanews/CONSOLE.TXT

Edited by chue
fix whtech link
  • Like 2

Share this post


Link to post
Share on other sites

I put the 99/4 TI troubleshooting manual up on WHT sometime back (in the 99/4 folder, IIRC). I have two different versions of the 99/4A TI troubleshooting manual, but I still need to scan those in.

  • Like 2

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...