Shorted Corona Board

[ttg tricksh0tzz]

Hey guys,
While i was wiring my new fan setup on my corona board, i was being reckless with the console powered on and a bare 12v wire bouncing around the place, i shorted somewhere on the topside of the board under where the disk drive would be. The console just beeps now when i try to power it on (no lights, no other sign of life). The light on the power brick stays yellow 100% of the time. I was hoping someone could advise me what would be the best course of action to fix it (where to look, how to check components, etc). I have another corona board lying around with a blown southbridge so i might be able to use some parts from that
Any help would be awesome,
Thanks in advance

 

[chase]

my advise is to never touch another console again

you can look for parts of the console that may have blown/burnt components or traces (start with the area where the loose wire was) ..

may help if you post really high quality hi-res pics of the top and bottom of the board

 

[ttg tricksh0tzz]

Haha, after this i dont ever want to look at one again! I tried taking pics with my best camera but its still terrible quality. Ive had a good long look but everything looks okay, no visibly burnt out caps or anything like that. Will i have to check every single component in that area with the multimeter? and if so, how will i be able to tell what are the correct values and such. Also, i have tested a good few resistors but cant get a reading. They are hardly all blown!
Thanks for the quick reply

 

[ultimate360]

Hope you didn't kill your CPU or southbridge, happened to a customer that brought theirs in to me who had a similar short happen while they were modding it as well.

 

[ttg tricksh0tzz]

my heart literally just sank when reading your post!
If it happens to be the CGPU then i can replace that, i have a spare but i have no spare southbridge

 

[ttg tricksh0tzz]

I just thought of something. I have 2 rf boards both with modded leds. Im not sure if they can display the error codes. So if the console is giving an error code but i cant see it, would the middle power led be on at least?

 

[Beaver_Buffcoat]

Have you tried unplugging the power brick from both the Xbox and the wall outlet for 30 seconds?

 

[ttg tricksh0tzz]

Have you tried unplugging the power brick from both the Xbox and the wall outlet for 30 seconds?

Yup, even tried another power supply, same result

 

[chase]

are you getting 3.3v, 5v or 12v on the board ?

check you voltages as you may have blown or shorted MOSFETs

check HERE .. it shows a trinity board but will help for sure

 

[ttg tricksh0tzz]

Here is a pic i pulled from online (identical to my board). These are my standby voltages. BLUE = 5v ---- RED = 3.3v ---- WHITE =0.15v. Are these the voltages you wanted me to check?

 

[chase]

Yes and there should be more points to test.. are you getting anything?

 

[ttg tricksh0tzz]

Not much else has voltage running through it to be honest, all of the mosfets are 0v. I thought they would at least have something

 

[Beaver_Buffcoat]

Check any fuses you see for continuity.

 

[ttg tricksh0tzz]

Checked every fuse i could find, all fine. I read that you cant test mosfets when they are on the board and that they are generally wired in parallel so if one blows, the current/voltage builds up in the other mosfets and blows them too. Is this true?

 

[ttg tricksh0tzz]

I just found 5 mosfets that are drain/source shorted, the other 10 are not. That must be the problem right?

 

[morinzo]

Honestly If I was you I'd send it to someone who know how to repair your issue. I know my fair share about 360 motherboards but that would be something I'd send to a pro after checking the fuses.

I know we all hate to send our stuff to someone to fix our screwup & I'm a stubborn guy that likes to learn myself, but thats prob where I'd throw in the towel.

Also a good rule is to never power on a console with a loose +5 or +12 wire unless it has heatshrink over it.

 

[Beaver_Buffcoat]

Checked every fuse i could find, all fine. I read that you cant test mosfets when they are on the board and that they are generally wired in parallel so if one blows, the current/voltage builds up in the other mosfets and blows them too. Is this true?

Yes.

I just found 5 mosfets that are drain/source shorted, the other 10 are not. That must be the problem right?

Yes, but there could be other problems. The biggest factor here is how much free time you have to f**k around.

 

[ttg tricksh0tzz]

Honestly If I was you I'd send it to someone who know how to repair your issue. I know my fair share about 360 motherboards but that would be something I'd send to a pro after checking the fuses.

I know we all hate to send our stuff to someone to fix our screwup & I'm a stubborn guy that likes to learn myself, but thats prob where I'd throw in the towel.

Also a good rule is to never power on a console with a loose +5 or +12 wire unless it has heatshrink over it.

I too am very stubborn and honestly i dont have the funds to get it professionally repaired. I know the odds of it ever working again are slim (hehe, slim, get it?!) but hey, i like fixing things so its worth a little more effort.
It was very stupid of me to leave the wire loose. And another good rule is to never mod a console or anything for that matter at 3am!

 

[ttg tricksh0tzz]

Yes.



Yes, but there could be other problems. The biggest factor here is how much free time you have to f**k around.

I have far more spare time than i like to admit,
Being socially awkward can be boring :tongue: