Help with J1D2 readings

AudioProUK

VIP Member
Sep 15, 2011
280
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Hi all ,
Ok i`ve been jtagging for a while and up until now i`ve not really had a problem. I`m not adept with a multimeter and would like a little help if poss please .

The problem is i can`t dump the nand . This board had been messed with before and was a dead board when i got it . I`ve shorted the nand and got it to now power up and give me a e71 error which is a start (well better than a dead board anyway) so .. i installed the j1d2 wiring and tried to read the nand and got "no flash controller " error .

I`ve rewired a few times and get nothing . I`ve now removed all wiring and want to test the J1D2 port for possible errors and need to know how to go about it. I dont have a camera so you`ll have to take my word for it when i sai I can solder ok and the last person who tried didn`t mess the port up by burning or breaking tracks.

My multi meter doesnt have a speaker so i have to use ohms .

What I put the red lead on ground (screw hole) I get the following readings from each point which i`m sure isnt right , so if some of you clever fellows could help me i`d be extremely greatful .

J1D2 , multi meter set to 20 ohms
points ... 1 2 3 4
reading in same order ...0.02 4.41 4.32 0.48


These reading me nothing to me except maybe point j1d2 1 is short to ground ??

please help me i`d love to get this going . I have plenty of salvage boards for parts if i need them .

Thanks in advance for any help .
 
Last edited:

AudioProUK

VIP Member
Sep 15, 2011
280
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I can`t i dont have a camera of any sort.

i have a uni-t ut30b multi meter


if that helps any . I`m trying to work out if the SPI is fried and i`m just wasting my time with it .
 

AudioProUK

VIP Member
Sep 15, 2011
280
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I`ve had the multimeter on all the traces to the alternetive points . It doesnt seem to be a trace as everything else is untouched . I`m thinking either the SPI is mullard or some other componant is knacked . i`m hoping for the latter as i have a ton of boards to salvage from but dont know how to tell if the SPI is duff as this would be the first one to rule out i presume as this would mean a southbridge replacement anyway .

thanks mate
 

Martin C

VIP Member
Jan 10, 2004
35,981
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Scotland, UK
www.team-xecuter.com
I can`t i dont have a camera of any sort.

i have a uni-t ut30b multi meter

Link To Image
if that helps any . I`m trying to work out if the SPI is fried and i`m just wasting my time with it .
Nice pic of a meter - not quite the board though!

J1D2 and J2B1 go to the southbridge, so you should be looking to the components under this for the problem (if it's not a trace issue).
 

AudioProUK

VIP Member
Sep 15, 2011
280
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yeah sorry martin i need to invest in a camera for this really ...i`ll see if my wife phone cam will do something but it naff ...one sec