Problem with U.P. install

[MrR]

Hi,

I have a psp with NAND trace CE cut (cut between point P and I) this should in theory disable the onboard NAND and alow controll of it for the U.P. chip
However the psp still boots original flash and always does so.
This is very weird and thus the psp cannot be modded. Any id how this can be solved?
Yes the trace is 100% cut psp have no shorts its a 081 model with firm 2.71
I'm a pro installer and have done 15+ installs already.
Are there any more people who had this problem? how can this be detected before install and maybe how can this be solved?

[Steve-O 2006]

youve done 15+ PSP installs? or 15+ Other console installs? Maybe a problem on the chip?? are you using a magnifying glass or just your bare eyes to check your joins / cuts etc?

[MrR]

psp is without chip/wires atm but ce NAND trace (trace between P&J) is still open. But the psp still boots..normally the psp should not behave like this if trace (Chip Enable) is cut the NAND should not work. How can this be????
Ow yes the trace is 1000% cut and yes 17+ up installs

If the psp behaves likes this the up chip when installed cannot gain controll and thus the psp can't be modded.

Any suggestions from pro installers?

[eja]

1) doublecheck the exact trace you cut: Find another schematic, another photo and check its location.
2) use a stereo microscope. Look for a copper remains in the cut. 20x to 40x with a decent microscope should do it.
3) try to widen the cut, just a little bit. Maybe some capacitive feedthrough is happening.
4) maybe if you carry on the problem will go away. (making NAND CE trace low impedance may solve the problem).
3) take a picture a) through microscope b) with a decent macro digi cam c) with a decent flatbead scanner, a thick scanner, not a thin one. Thin one's don't have focal range.

Look at the pictures. Compare. Still no clue then look at the PCB. Well documented are the TA-079 and the TA-081. Until now no TA-080 has been found. Which sub-type of TA-079/081 have you got? TA-081-11 or 21 or 31?

Don't use the metal sheet to count out the traces, use a pen or so as marker.

If you find a you have got a new PCB, upload the pictures to rapidshare or similar.

I'm have experience in fine line PCB troubleshooting, but I'm still waiting for my UP to arrive.

[MrR]

@ eja

Thanks for the tips
I check the traces with 35x magnifier
I cut the trace at 2 diff points to be certain..same result

[DaWaN]

You measured the cut with a multimeter for resistance ?

[eja]

I read PS2DEV ;)

For comparison: http://rapidshare.de/files/25395667/nand.png.html

What PCB you have got? This old picture is a repost, its a TA-079-xxxxx-11?
Photo's?

[MrR]

I have TA-081 with 2.71 firm The psp is back with the owner atm..but I'm confident WE will be facing this problem more in the future and I really hope this problem can be solved asap.

[Mr-A]

MrR, as I already told you in another thread - I have also experienced the same behavior however when I completed the install everything worked fine. One of the PSP's I modded would still boot after CS had been cut but once the chip was installed it worked properly. I suspect this has something to do with CS being left in High-Z once the cut has been made, possibly forcing the NAND bus to always be active?