Search found 28 matches

by GozdniJezek
16 Jul 2019 12:52
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 73
Views: 15488

Re: MTX 512 (debugging thread)

Thank you, I'll try this out. I'll get back to you on the results :)
by GozdniJezek
14 Jul 2019 11:54
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 73
Views: 15488

Re: MTX 512 (debugging thread)

Hello, it's me again :lol: So, first a recap: I have socketed all of the video RAM and I've replaced all of the 4116 with a known good one. the picture after it was like: IMG_20190713_123944.jpg Than i checked the voltages again, and I've figured out, that sometime during the replacement and resocke...
by GozdniJezek
07 Jul 2019 18:35
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 73
Views: 15488

Re: MTX 512 (debugging thread)

Good idea will also check for that. Thank you.
by GozdniJezek
07 Jul 2019 18:19
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 73
Views: 15488

Re: MTX 512 (debugging thread)

Will also do that, thank you.
by GozdniJezek
07 Jul 2019 18:03
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 73
Views: 15488

Re: MTX 512 (debugging thread)

Hello, thank you for the fast answer, yes the problem is reproducible if i turn it on and off again. I will concentrate on finding the next bad VRAM (or multiple of them). Any more tricks in helping to identify it? :) Regarding the keyboard, i have not yet come to fully debugging it, but the only th...
by GozdniJezek
07 Jul 2019 12:17
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 73
Views: 15488

Re: MTX 512 (debugging thread)

Hello, it's me again, reporting on progress and "progress". 1.) I managed to replace a faulty 4116 video RAM and i even managed to get it out in one piece. To determine the faulty IC i shorted the pin 14 with an 10 ohm resistor. I've added a socket and a new old stock 4116 (it's from a different sup...
by GozdniJezek
23 Jun 2019 14:38
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 73
Views: 15488

Re: MTX 512 (debugging thread)

--Have we given you tips on the best way of removing soldered in chips?
Yes sir. I don't think i have the tools to try to salvage the IC, neither is there much point in trying to do so.
Thank you.
by GozdniJezek
23 Jun 2019 13:24
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 73
Views: 15488

Re: MTX 512 (debugging thread)

Thank you for the help. I'll get back with the results (again, it might take a while to get the 4116 and to test the ram).
by GozdniJezek
23 Jun 2019 13:09
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 73
Views: 15488

Re: MTX 512 (debugging thread)

Hello, thank you for the answers and sorry for my late reply, but the time did not permit to continue on this project until now. So to recap what have I done until now: 1.) I measured the voltages on some of the IC-s that made sense to me (please alert me if i missed something obvious). Please see t...
by GozdniJezek
12 Jun 2019 14:33
Forum: GENERAL DISCUSSIONS
Topic: MTX 512 (debugging thread)
Replies: 73
Views: 15488

Re: MTX 512 (debugging thread)

So using 4164 and modifying it, is just "crippling" it to work as 8k. Got it, thank you.
If I'm socketing everything i would also prefere to use 4116 as the price is the same and i don't need to modify them.

Will report back when i'll make any progress. Thank you!