Dreambox 500 - JTAG Information

[mhku]

In case this got missed within the other thread, here are a bootloader and JTAG diagrams that you may find useful if you have a clone and Gemini 4.31.

You can download a bootloader here:

_http://rapidshare.com/files/87512303/dreamboxbootloader.rar.html

PCB pins:

Signal Pin Pin Signal

TDO 1 2 N/C
TDI 3 4 TRST
N/C 5 6 VCCS
TCK 7 8 N/C
TMS 9 10 N/C
HALT 11 12 N/C
N/C 13 14 ***
N/C 15 16 GND
db25 . . decoder

The cable (DB25 = printer port connector):

DB25 > resistor > PCB pin

2 --> 100 ohms --> 11 ( Halt)
3 --> 100 ohms --> 9 ( Tms )
4 --> 100 ohms --> 7 ( Tck )
5 --> 100 ohms --> 3 ( Tdi )
11 --> 100 ohms --> 1 ( Tdo )
25 ------------------ 16 ( Ground)

You may also be able to use a CAS2 or CAS3 to jtag it. Use at your own risk.

I haven't tested it and you should contact your seller to obtain a refund if possible.

Updated 21.04.08:

These files have been tested by philip633

_http://rapidshare.com/files/109184199/bootloader.rar.html

JTAG program
BIN file
MAC generator

See here for more details:

http://www.satellites.co.uk/satellit...tml#post736304

[sapekman]

thanks for the info mate, no choice now i have to try it to my two dead clone dm....

[T_G]

let us know if you managed to do it. I think it would be great help if you would make some pictures of the insides etc and post it. It's an interesting subject not just for clones or 500's.

[mhku]

An article showing how to make a JTAG cable (not a Dreambox one but the principle is similar):

_http://www.diygadget.com/store/building-simple-jtag-cable/info_12.html

[adamedoe]

It looks simple. Has anyone tried it yet?

[koptanx]

thanks for the info mate,

[adamedoe]

Got good & bad news for people who lost their DM500 on the killing day (04/16/08).

The good news is you can fix your DM500 So, Gemini == YOU LOSE

The bad news is it has nothing to do with the JTAG & stuff. Got mine fixed by IT guy. He opened it, take out a chip, flashed it with a big stuff connected to a computer. Costs me about 30 box, but it's fixed.

I'm running Gemini 3.2 while searching for a reliable image working fine with a clone DM.

We survived

[MaliZeleni]

Can you please take a picture of that chip that wes taken out and flashed?

You have first fixed dead box that I heard and I'm online all day looking around for someone that made to fix it.

Can you describe all process?

BIG THANKS in the name of all people that have dead boxes.

They need all possible help to fix their boxes.

[freon]

The man removed flash, placed it on the programmator - flash it with dump file. Done.
Mostly people dont have that kind of adapter for that flash!!!
I'll try tomorow morning to JTAG some boxes.

[Sharkadder]

sound's good, so what sort of programmer is this, casII?

[adamedoe]

If you can post a pic of a DM500 cloned open, I can show you the chip in question.

About the programmer, it was a huge thing, bigger than the DM500, he put above it in a slot a kind of chip holder where he slides the one remover from the box. He uses a computer to flash it, after 10mn, it's done! He put it back.

Et voila! DM lights up, it raises from death

[mhku]

Image of inside found via google images:

[MaliZeleni]

I don't have clone box,I have original,but I'll try to find a picture.

[adamedoe]

here it is. Hope that helps!

[Sharkadder]

ok nice, can you ask your friend what sort of programmer it is? and how we actually get the chip off the board, you cannot just pick it up surely.

Your friend probably has one of these all in 1 programmers, if we could find one what did the job for something like this, we may find one for £30-50 of we look in the right places

[adamedoe]

He's not my friend he's an IT technician who fixes satellites.
I gave him the DM & forced the entrance to his atelier. He wasn't happy to see me sticking my nose on his stuff & asking what's this & what's that

I was looking for any clue to help others find a solution to revive their DMs.

[Sharkadder]

well at least it's something i guess, you say this guy charges 30? plus the postage and packaging to get it there/back, it's gonna come to about £45 just to fix it, now i do wish i had all these sort's of programmers lol. I could of raked it in but nevermind.

You may have to see him when he's in a good mood to see what type of programmer it is

[selector]

this is tool for rpir DM500

Attachment removed, the posting of bin files is forbidden in the rules, I suggest you post what you think will help people on sendspace or somewhere equivalent

[Sharkadder]

yeah post a dead link with the file in a rar or something, that may help

[mhku]

Post #1 has several Dm500s bootloaders in it.

[freon]

JTAG works
This morning I repaired 5 "adios amigos" boxes!

[dino27]

How works adios amigos

[LMANPJ]

JTAG works
This morning I repaired 5 "adios amigos" boxes!

How?
JTAG or Cas Interface 2?

[xichas]

JTAG works
This morning I repaired 5 "adios amigos" boxes!

Hi my friend ! Can you explain better how did you made it....

Im trying to use jtag for about 3 days with no results, I have a DM500s clone can you describe step by step how you made it???

thanks in advance

[freon]

XP SP2 PC used
ECP+EPP printer port setup + never use interrupt
DB25 male printer connector
6 wieres + 5 resistors of 100 ohms
ON printer connector short connect pin 18 to 25 and connect the last wire.
rest of the wieres connect the resistors and use the schematics placed on the RDI.
When You hit the connect simultaniously place the power to dream.
That should do it!