R-Jtag Xell doesn't start

[Swizzy 2084]

Issues like this are usually caused by soldering to the tiny resistor on the jtag qsb. I would bet if you check the value on that resistor it is blown.

He replaced that resistor as it came off... maybe the new resistor isn't close enough to 10k ohm?

[GoJohnny 11]

I used a 10K Ohm resistor, like the one shown in the attached picture. Should i use one like that to replace it (i bought a few), or better use another kind of resistor?

[Swizzy 2084]

I used a 10K Ohm resistor, like the one shown in the attached picture. Should i use one like that to replace it (i bought a few), or better use another kind of resistor?

The resistor you've got there is ok for most applications, but might not be good enough for this purpose, SMD resistors have a very high precision (low tolerance) the one you've got there is 10K Ω ± 5% while SMD ones can be as low as ± 0.01% in the Tolerance, however, you should be good with one of these: http://www.conrad.com/ce/en/product/423483/1-pcsx-Metal-film-resistor?ref=list that is the lowest tolerance normal resistor i could find on conrad which have the correct resistance

I can't be 100% sure this will fix your problem, but, it's worth a shot?

[GoJohnny 11]

Okay, thanks again Swizzy, found it on the Dutch version of Conrad. I'll go look for it at my local electrostore (that's where i bought the other ones as well).

Hope this works, i will defenitly try this, but if it doesn't work, maybe a stupid question, but why does the console boot when i place my thumb on the points of the RF board? Isn't there some way of connecting some of those points to make it boot? ( Sorry, probably a verry noob question, but i just had to ask)

[Swizzy 2084]

It's probably that when you press there you create a weak connection with ground for the point you put the solder on, if you put a wire there it won't work as that's a strong connection, basically... your body works a little bit like a resistor you don't create a full on connection, but it's enough to trigger a reaction

[GoJohnny 11]

Ah, okay, thanks a lot for explaining, that totaly fulfilled my curiosity.

[Swizzy 2084]

Ah, okay, thanks a lot for explaining, that totaly fulfilled my curiosity.

When you talk to the guys in the local electronics store, tell them you need a high precision 10k ohm resistor, the lower the Tolerance the better as this means it's going to be closer to 10k ohm, a 5% resistor can be anywhere from 9 up to 11 ohm roughly and the closer to 10k ohm you get the better it is

[GoJohnny 11]

The lowest one they had was a 10K ohm resistor with a tolerance of 1%. I understand this might not be enough, but i bought it anyway, just to give it a try.

If it doesn't work i'll order the one at Conrad. Of course i'll let you know if it works or not.

[GoJohnny 11]

Well, i replaced the resistor with the lower tolerance one, but it is still not working.

With the RF board in, sometimes the console does start, (but freezes in the Xbox welcome screen), and sometimes it doesn't start. With the other resistor when i put my thumb on the RF board it booted imediately all the time, but with this resistor sometimes it boots and sometimes it doesn't. When i press the start button and remove the RF board it does boot.

Do you think replacing the resistor with an even lower tolerance resistor would do the job, or could there be an other problem?

[gavin_darkglider 1562]

At this point, I would say try another rf board, if you have one.

[GoJohnny 11]

I asked the guys at the local electroshop to order a resistor with the lowest possible tolerance they could get. Meanwile i read just about everything i could find about this issue, and everyone advices to fix the R2P12. But you told me you were not 100% sure it would fix the problem, are you thinking of a other issue, and if you are, how can i check this?

And one more question if i may, in a previous reply you explained to me that my thumb created a connection to the point i put solder on (R2P12?) Does this mean i can at least be sure that point is soldered right?

Sorry to keep bothering you with all my questions, but i still have hope to get the Xbox working like it should, because it is not even mine. I was just trying to help out someone else.

[GoJohnny 11]

sorry, i had not read the advice of trying  another rf board. i don't have one lying around, but i could get the one of my own xbox.

can i just get it out of the one and put it in the other to test it?

[andrewrich 35]

sorry, i had not read the advice of trying another rf board. i don't have one lying around, but i could get the one of my own xbox.

can i just get it out of the one and put it in the other to test it?

As long as there both the same model eg a phat and a phat, or slim and slim then yes you should be able to.

Sent from my fingers

[Swizzy 2084]

As long as there both the same model eg a phat and a phat, or slim and slim then yes you should be able to.

Sent from my fingers

Yes, phat RF-boards work with phats while Xbox 360 S RF Boards work with both Xbox 360 S and Xbox 360 E (Slim and "Super Slim" or "Slim E")

[GoJohnny 11]

Okay, thanks, they're both Phats, so that should work. I'll give it a try tomorrow, and let you know.

Oh yeah, what about my previous question, if that confirmed good soldering to the R2P12 point?

[Swizzy 2084]

Okay, thanks, they're both Phats, so that should work. I'll give it a try tomorrow, and let you know.

Oh yeah, what about my previous question, if that confirmed good soldering to the R2P12 point?

It means they're connected, it doesn't mean they have a strong connection, however it should be good enough...

[GoJohnny 11]

Okay, i'm glad to know that soldering to that point is okay. Because, i wouldn't dare to touch that point with a soldering iron again, haha.

So, when it comes in, i'll try both;  using a even lower tolerance resistor and replacement of the RF board. Hope at least one sollution will work.

[GoJohnny 11]

So, i have taken the RF board from my own Xbox and placed it in the one i am working on, but unfortunatly it had the same result. Tomorrow i'm getting a resistor with a 0.1% tolerance (lowest they could deliver), i verry much hope this will do the job.

[GoJohnny 11]

Oh no, i replaced the 10K Ohm 1% resistor with a 10K Ohm 0.1% resistor, and it still doesn't boot like it should. And this was the resistor with the lowest tolerance i could find. Something seems to have changed though, cause now it doesn't boot when i take the RF board out, but it does boot all the time when i place my tumb on the points of the RF board. ( within 20 sec. up to 1 min. max.).

Isn't there any way of reproducing that situation (thumb on RF)? Don't care if it is not perfect, as long as it works.

[andrewrich 35]

Oh no, i replaced the 10K Ohm 1% resistor with a 10K Ohm 0.1% resistor, and it still doesn't boot like it should. And this was the resistor with the lowest tolerance i could find. Something seems to have changed though, cause now it doesn't boot when i take the RF board out, but it does boot all the time when i place my tumb on the points of the RF board. ( within 20 sec. up to 1 min. max.).

Isn't there any way of reproducing that situation (thumb on RF)? Don't care if it is not perfect, as long as it works.

Is it your thumb making a connection or is it the pressure of your thumb on the RF that is making it work maybe you have a bad connecter that the Rf slots into, just pulling a straws but worth shot try using something non conductive to add pressure were you would of had your thumb see if it boots if nothing else you rule something else out

Sent from my fingers

[GoJohnny 11]

No, thanks for replying Andrewrich, but it is not a bad connector. Swizzy already explained to me how my thumb makes a connection. I only hope someone can tell me how to reproduce this connection, cause i just about tried everything to get this console started, but it is just not working.

[Swizzy 2084]

Just because that is one of the possibilities doesn't mean it's the only possibility, what he mentioned is another possibility...

[GoJohnny 11]

?? maybe i did not formulate my answer right, because English is not my native language. I appreciated the reply, and do understand what he meant though, at least, i think i do? But as it seems, the RF board is not the problem, as i tried another one, with the same result. I also tried pushing the board in to the console, without touching those points, but that also didn't work. Like i said, it only boots when i put my thumb on the points at the front of the RF board. I really hope you still have other possibilities to get the console starting, i would be verry thankful, as my hair is about to turn  grey right now.

[GoJohnny 11]

Just to make sure, i tried the possibility Andrewrich mentioned, and wore a glove while pushing the points on the RF board. But as much as i wished it would start, unfortunately it didn't. Only when i touch the points with my bare hands it starts ( i have to touch two points or more, don't even have to push)

 

Now, i know you helped me out a lot Swizzy, but if you could please tell me if there is any other possibility to get this Xbox working, as i said before, i would be verry thankfull.

It does not have to be a pretty sollution, as long as it works, it would make me verry happy.

(Also, if even you don't know what to do next, i would like to know that as well, so i would know where i stand with this console).

[Swizzy 2084]

Check with a multimeter exactly what resistance you get from the resistor you installed, preferably when it's not installed in the console, and see exactly how close to 10k ohm it is, i have a feeling you might need an additional resistor to bring it closer to 10k ohm