Topic: Lpt Cable Was Dumping But Doesnt Anymore (Read 64 times)

loady · « **on:** June 30, 2011, 01:57:00 AM »

This is my first attempt at a jtag, i have a xenon board first edition. i followed a guide that used resistors and diodes, i couldnt get it to dump, i read that i should remove the resistors, i did and i started to get lots of non identical dumps, i read elsewhere that the cable length could have something to do with this so i cut some out and soldered together, after this it would not read, kept getting couldnt detect flash controller, in the end i desoldered ALL the LPT cable wiring and done it from scratch using cat cable, i soldered resistor pins to the ends of the wires and cut them down and push them through the solder points, i insulated them to avoid shorting, still it is not dumping anymore, i have read the 'lpt controller not detecting' thread but i can seem to get a chronolgical order of how to resolve this, it worked before so why not now, what is the next step ?

GvM · « **Reply #1 on:** June 30, 2011, 02:20:00 AM »

I had "controller not found" error when the soldering to mobo was bad or probably bad wires.
Then I got utp5 cable around 20-30cm, resoldered it right to mobo getting wires through the soldering points without resistors.
In result I had "non-identical" dumps.
In the end I soldered resistors to lpt, got grounding wire from the metal part of db25m to copper points where were mobo screws.
Not sure that all these was the real problem.

Now back to the coolstory.

I was using this scheme and then soldered BOTH GND wires on this image to 18-th lpt pin.
In end of these actions I got no errors, 100% each time identical dumps.

Still though I couldn't get a proper soldering of GND wire which at bottom right on this image (j2b1.12 i think) so after a lot dumps and bending of the cable the wire got off its point (j2b1.12), and I got "controller not found again"!!!
Note that I used both GND's soldered together (j1d2.6 and j2b1.12 to lpt with 2 wires).
So j2b1.12 was REALLY required one.
And note that it doesn't shown on other lpt spi images, only on this one.

ps my console is falcon so probably it's only falcon-specific, but who knows, try yourself.

This post has been edited by GvM: Jun 30 2011, 09:22 AM

loady · « **Reply #2 on:** June 30, 2011, 03:15:00 AM »

That scheme is the same as i am using for the LPT cable as apparently they are all the same for all board revisions as far as the LPT cable goes, the jtag points are different for different boards though...interesting thought on the ground though, i soldered a different ground when i resoldered everything this time, i will solder the other ground as well and see if its any better..maybe do three of them

loady · « **Reply #3 on:** June 30, 2011, 04:02:00 AM »

i reflowed/fluxed all the joints, tried both grounds together to lpt pin 18 and also the copper where mobo screws...still no joy, it just doesnt make sense !! it was working and stopped working when i shortened the wires..what do i do next..will usb flasher work where this failed ? will the shorting pins trick work ?

loady · « **Reply #4 on:** June 30, 2011, 04:44:00 AM »

how would i tell if i blew the flash controller somehow ?..i have the skill to desolder the nand if needed...i dont care how i do this, i just want the box jtagged

hangover · « **Reply #5 on:** June 30, 2011, 05:53:00 AM »

I had much better success with usb ( 100% ) but lpt worked fine for xenon and zephyr but no good on my falcon.

loady · « **Reply #6 on:** June 30, 2011, 01:15:00 PM »

going to try with a adapted paralell cable now..not holding my breath though...i had some solder wick stick to the board...its a bastard to get off...not sure if i buggered it now..i have cut accross to try to isolate the holes..

picture

This post has been edited by loady: Jun 30 2011, 08:16 PM

loady · « **Reply #7 on:** July 01, 2011, 03:41:00 AM »

well, i have now soldered a cut down LPT cable to the board, still not detecting..its not the soldering at all..checked it, the first time i done it when it worked it was a lot more shabby..i have ordered a NAND-X now but i am not holding my breath that will work either..i think somethings broke but i dont know what.

hangover · « **Reply #8 on:** July 01, 2011, 04:47:00 AM »

QUOTE(loady @ Jul 1 2011, 05:15 AM)

going to try with a adapted paralell cable now..not holding my breath though...i had some solder wick stick to the board...its a bastard to get off...not sure if i buggered it now..i have cut accross to try to isolate the holes..

picture

Wow you have really cooked the mobo, see where the laminate is bubbled

loady · « **Reply #9 on:** July 02, 2011, 08:06:00 AM »

It dump before just fine like that. any way, its not bubbled it just flux, it said no clean so i never bothered to clean it off...hopefully nand x will do the job but i think not

hangover · « **Reply #10 on:** July 02, 2011, 08:38:00 AM »

I use no clean flux and it doesnt burn like that so i'd say its toast .

Author Topic: Lpt Cable Was Dumping But Doesnt Anymore (Read 64 times)