Two TF1260 boards with undiagnosed faults

[foft]

I've been building a few TF1260 boards to sell with some rev 6 CPUs. In fact they were factory built and I just needed to solder on the cpu socket, ide header and connection socket.

I have a couple that I've not been able to diagnose in several hours (just replacing CPLDs + other chips, checking joints under microscope).

Is anyone interested in both for a project to look into properly?

Two boards:
board a) Does not boot at all, RAM CPLD gets hot. I replaced both CPLDs and ram on this board, I also repaired some capacitors & one broken trace.
board b) Boots up fine, but no ram seen. I replaced ALL chips on this board.
On both boards the CPLDs appear on JTAG and program/verify ok.

Looking for 40CHF each (or 70CHF total for both) + 20CHF worldwide shipping. This includes both boards and I can also include 3 spare desoldered CPLDs, ram chips and bus drivers (on request).

I can also include an 68LC060 CPU (or two) at an extra 40 CHF each (special price for with these boards).

[dalek]

If noone else wants them I'd be interested. Pics if you've got 'em?

[foft]

OK here we are:
Let me know if you want any close ups.

Spare parts (all desoldered, untested):

IMG_0678.JPG

Board 1 (boots but no fast ram):

IMG_0679.JPG

IMG_0680.JPG

Board 2 (does not boot, hot cpld - even after replacing both of them):

IMG_0681.JPG

IMG_0682.JPG

cap_repair.jpg

Dead boards (both with broken traces, but have some spart parts on):

IMG_0685.JPG

IMG_0686.JPG

[foft]

I managed to fix the board showing 0 ram, so that one is no longer for sale :shock:

[foft]

The last one still remains. I think I've changed everything on it several times by now :lol:

Anyway the latest is that I fitted two 'brand new' (from aliexpress) CPLDs just in case there were issues with the various other ones I've fitted. Then I put it through the ultrasonic in case of any dirt I couldn't see messing things up, so its nice and clean.

Still no dice from it though, it just gives me a black screen.

Anyway its still available for one more week and, if no takers, I'll just take the useful parts off it and consign the board to the e-waste.

[jurassicman]

Could you, please, tell me what was the problem with the board showing 0 ram?
I have a TF1230 with the same issue and before sending it back to the seller I was trying to understand if there is anything I could do.
Thanks in advance!

[foft]

Honestly I’m not sure, I changed cplds and ram again I think. Most likely a bad connection somewhere.

[jurassicman]

Thanks for your reply. :)

[foft]

All gone - one was fixed and the other sold as a project/decoration!