View Single Post
Old 05 August 2020, 13:24   #12
DigitalKeeper
Registered User
DigitalKeeper's Avatar
 
Join Date: Jun 2020
Location: Germany
Posts: 39
Lightbulb

Ramsey (U890) - Pin 15 (PWRUP) -> _FAIL MUST be at min. +4.8 Volt

AND

Gary (U150) - Pin 56 (Powerup) -> _FAIL MUST be at min.+4,8 Volt

if not -> the Board won't boot

check the Power Connector's for Oxyd/Black Surfaces, and if there is no space between the plug and the connector; often there are shacky/waggly




Next "thing" - ya wrote "...Reset is Low..."

Check the Adress- and Data Lines for broken/corroded traces; in most cases -> at U975 & U976 the Area "looks" good, but it doesn't good -> that means - BOTH - Sides -> Top and Bottom

Check, if the "MDAT" Line comes up -> look and check the Traces from U975 Pin 13 to Lisa Pin 20 - if this Line/Signal is not present - Lisa get "stuck" and System won't boot
DigitalKeeper is offline  
 
Page generated in 0.06529 seconds with 11 queries