Search found 7 matches

by doc
Thu Sep 19, 2019 7:33 pm
Forum: HARDWARE ISSUES
Topic: Help bringing my 1040STf back to life
Replies: 22
Views: 2629

Re: Help bringing my 1040STf back to life

Success !!! Thank you evereyone for your replies and advices to my memory trouble. I finaly succeeded in changing the faulty DRAM bank thanks to Exxos ram set. It was rather difficult to unsold the chips. I used a desolder pumping station to archive that, but even with this efficient material it was...
by doc
Wed Sep 11, 2019 12:37 pm
Forum: HARDWARE ISSUES
Topic: Help bringing my 1040STf back to life
Replies: 22
Views: 2629

Re: Help bringing my 1040STf back to life

A bit funky to desolder the bank. I'm waiting to seek good soldering materials...
by doc
Mon Sep 02, 2019 7:46 pm
Forum: HARDWARE ISSUES
Topic: Help bringing my 1040STf back to life
Replies: 22
Views: 2629

Re: Help bringing my 1040STf back to life

Ok I'm gonna try to change the DRAM bank ... need now to find sockets and chips. Any advice where to buy them will be appreciated. Do you sell them ?
I'll keep you in touch for the results ...
by doc
Mon Sep 02, 2019 7:08 pm
Forum: HARDWARE ISSUES
Topic: Help bringing my 1040STf back to life
Replies: 22
Views: 2629

Re: Help bringing my 1040STf back to life

Ok thanks you all.
So I give up :(
by doc
Tue Aug 27, 2019 4:46 pm
Forum: HARDWARE ISSUES
Topic: Help bringing my 1040STf back to life
Replies: 22
Views: 2629

Re: Help bringing my 1040STf back to life

Perhaps i'm wrong but the measures I get would say that there is no cut tracks on the board. So in your opinion does it worth a try to your 4MB upgrade (STFM 4MB RAM EXPANSION) ...
by doc
Tue Aug 27, 2019 2:51 pm
Forum: HARDWARE ISSUES
Topic: Help bringing my 1040STf back to life
Replies: 22
Views: 2629

Re: Help bringing my 1040STf back to life

Hi, Thank you everybody for all your nice answers. Following your words, I tested all what I could on the RAM. First of all the board is composed of 2 banks of TMM41256P-15 chips (I included a datashit here). TMM41256P-15.jpg I made some measurments (with a voltmeter, i do not have a scope) 1) Witho...
by doc
Mon Aug 26, 2019 2:16 pm
Forum: HARDWARE ISSUES
Topic: Help bringing my 1040STf back to life
Replies: 22
Views: 2629

Re: Help bringing my 1040STf back to life

Hi. Did you finaly found out the problem ? I have A 1040STF that presents exactly the same trouble. Bank 1 has dissapeared. I cleaned all the board and the MMU but it did not change anything. AI also wondered if Exxos 4MB Upgrade (STFM 4MB RAM EXPANSION) would permit to get 4MB Back in this case ......

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