VAG-COM/VCDS EVERYTHING

[liviudiaconu]

when you reflash atmega, atmega must be powered.

How?
1 power on the cable (+12V)
2 power on atmega from programmer (+5V on pin 3 of 7805).

[giuseppe1374]

Yes, I've done as you said, but later because of many tests I was confused and I reflashed without 12v of 7805 but with usb cable attached and now ATmega seems dead, no longer possibbile reflashed again

[liviudiaconu]

Is possible with "atmega doctor"

Atmega HVPP fusebit doctor ***8211; napraw fusebity, fix fusebits >> Manekinen DIY

Have anyone schematic for this newest cables?

[giuseppe1374]

the ATmega doctor you can buy? I do not think I am able to build

[liviudiaconu]

i don't know, i made it myself..
but to buy mean you work with much [b]locked atmega...
With price of doctor you can buy few newest atmega..

[colouny]

The reason i ash is that i cant use ponyProg, i am on win8 for like 1 year. But thanks for hint i still have very old laptop wich still has XP will try today.

You didn't mention this.
Good luck[/QUOTE]

No problem, have sorted everything pretty easy on my old laptop. Thanks again for hint.
11.11 tested on one car, still works, will se how it goes. No i need to do the same for the polish version for my firend...

[mattydr67]

You didn't mention this.
Good luck[quote/]

No problem, have sorted everything pretty easy on my old laptop. Thanks again for hint.
11.11 tested on one car, still works, will se how it goes. No i need to do the same for the polish version for my firend...

If you have polish dump you can do it.
Good luck

[giuseppe1374]

many thanks to all those who helped me, I mean I bought a new ATmega, I reflashed and my cable is now in life, so I think that when the cable has 12v power but the LED is off, this means that ATmega is dead. greetings to all forum users.
very best regards

[KenshinPT]

many thanks to all those who helped me, I mean I bought a new ATmega, I reflashed and my cable is now in life, so I think that when the cable has 12v power but the LED is off, this means that ATmega is dead. greetings to all forum users.
very best regards

Very nice

Keep in mind that you might wrongly disabled SPIEN for that "dead" ATMEGA

But you don't have HVPP to check it right?!

Good luck.

Regards.

[liviudiaconu]

with serial programmer cannot disable SPIEN.. on most programmers is "grayed"... but i have found that if during programming the power of atmega is disconected or a wire between programmer and atmega is desoldered (to me the gnd was intrerrupted) is possible to lock "forever" the atmega.

But, is easy to repair with "atmega doctor", in fact an "reduced HVPP", who write like HVPP but only the factory bits from a list from firmware.

[giuseppe1374]

Hi, sorry, it's still me, today I made a new reading but the cable does not seem to be working properly read I did the test and exit "short +12" What can it be?

[bibkare]

Hi, sorry, it's still me, today I made a new reading but the cable does not seem to be working properly read I did the test and exit "short +12" What can it be?

You have one broken transistor, i bet it's this one in yellow circle

[giuseppe1374]

how can I measure this transistor?

[KenshinPT]

Hi, sorry, it's still me, today I made a new reading but the cable does not seem to be working properly read I did the test and exit "short +12" What can it be?

Also, recheck all solders of the ATMEGA. If you replace it, you might have short or the PCB is not cleaned well making a short between pads.

I have this problem once. K Line shorted due to excess of flux.

So: Clean PCB, recheck all solder pads of ATMEGA and also test those 4 transistors.

Good luck.

Regards.

[KenshinPT]

how can I measure this transistor?

When a transistor is bad... 99.9999999% of those times it is shorted instead of open.

So use a multimer in the continuity mode. I bet you will hear a BIP BIP or BUZZ BUZZ or PIP PIP


Good luck