3.3v problem

[chris.hoch]

Does anybody know where the 3.3v track (for pin 9 on the LPC) starts?

I am installing it on a 1.6 motherboard and the continuity on the LPC from the start solder to the end is fine, but I want to check from the begingin of the track and trace down why it is not recievng the 3.3v

I hope this is clear

thanks in advance

regards

chris

 

[chris.hoch]

Having a closer look at the LPC pin 9 draws it power of pin 15... where does pin 15 get's it voltage from? or have I got this completely wrong??

regards

chris

 

[sb122606]

Pin 15 is the 3.3V supply and is on a track on the component side of the board.
Directly above it you can see a capacitor (C7D1) the left hand side of this is 3.3V

 

[chris.hoch]

If i have the board eith the Lan port in the top left, above the pin header is C7D2, C7D1 is bottom right of pin 1.

Am I going for C7D1?

regards

chris

 

[Xecuter]

dont do anything blind - use a multimeter

if you are still unsure try pin 15 as that is where x3 pulls 3.3v from - if its not there try a link to pin 9 (which is what the rebuild pcb does anyway)

 

[chris.hoch]

Believe me I am not doing it blind... the multimeter is in the hand and testing away for voltage and continuity... Still having difficulty.

Going to keep on going till i get it right though

 

[chris.hoch]

ok i have continuity from C7D2 to pin 15 then on to pin 9. I power it up and it FRAGS.

I check the voltage from pin 15, grounding on the case, and I get 3.3v... check pin9 and it has 3.3v.

but the blue 3.3v LED does not light up and like I said it frags.

Any more ideas?

c

 

[sb122606]

First sorry about the typo i meant C7D2 just hit the wrong key..
hope i did not waste too much of your time on that...

r u measuring 3.3V with the chip attached??

could be that if not then something is pulling it down...I have seen this once but disconnect your switch bank at the chip and see what happens then

it maybe u have a faulty x3 but for me it will be the first i have come accross.