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I told the customer about the GPU problem and he wanted it fixed anyway. Not a very nice job to do though: it needs a lot of heat (on this scary board), some traces were broken and it needed a new current limiter for the USB ports (only outputting 2.4V). Anyway, fixed now. Thanks Duke!

What's the voltage drop to ground on backlight output (diode measurement, red probe on ground)? Also, check again for continuity between pin 1 of L9701 and the connector.

Hi guys, I've got an 820-2915 here with one USB-port and the DP port physically torn from the board. I've cleaned up the area and connections seem fine for new ports. Any suggestions on harvesting the ports from a donor board without melting the plastic? Just heat from below presumably...

Hmmm.... Seems like a lot of trouble for this connector, but I guess it has to be done. :mad: Anyway, as always, thanks for your good suggestions!

Says it all in the title. Customer super glued the damn thing to the motherboard... Is it possible to splice the cable and connect one from an old screen? Or do I have to disassemble the whole screen assembly? Thanks!

Never mind, I just fixed this one. PP5V_S4RS3 was shorted on C7553. Repealed and replaced it and now it's working again. Thanks for your suggestions people. Cheers, Rick

Nope, know good battery doesn't change a thing compared to above. So info so far: * PPBUS_G3H is around 8.56 volts but isn't stable (stabilises at 8.67V with battery attached) * Resistance ISL6259 (replaced): - 17/18: 3 ohms - 27/28: 20 ohms * PPDCIN_G3H: Varies slightly between 16.65 and...

R7105 measures fine. Tried the machine with it's own battery (status unknown) and this seems to stabilise PPBUS_G3H at 8.67V. I'll try and find a properly charged battery next. Any suggestions as to what this means and what my next step would be? Kind of lost on this one. Thanks, Rick

Thanks. I think all S5 rails are fluctuating because of PPBUS_G3H. None of them are 0V.

Resistance ISL6259: * 17/18: 3 ohms * 27/28: 20 ohms PPDCIN_G3H: Varies slightly between 16.65 and 16.66v

Hi, I've got a 820-3437 board here that won't turn on. Magsafe light is on, but nothing else happens. PPBUS_G3H is around 8.56 volts but isn't stable. Replaced ISL6259, didn't help. Any suggestions where to look next? Thanks, Rick

As there was no corrosion on the board, I decided to replace the clockchip and reflow the parts around it as it had some discoloured test points around it. Fixed the issue. Thanks for helping anyway!

Thanks people. larossmann or dukefawks any suggestions on getting rid of the residue?

Hi, I've got a 820-3437b board here which sometimes turns on, but mostly doesn't. When it doesn't turn on, the fan spins twice (as usual) and then just stops completely. The owner has cleaned the board with IPA, so no hints on the board. Any suggestions before putting it in the ultrasonic...

I don't know about the WiFi cables and would appreciate a good tip on this too :) I would try to release the screw with a sharp screwdriver. Maybe even with tweezers...

I don't think you have a short (18ohm is not a short). Fix the trace and see if this fixes it.

1. Did you fix the trace? 2. Is it shorted or does it have a really low resistance to ground?

If you're interested, send your contact details in PM. You have my word I won't bother you through your company contact :)

I could refer the client your way. What's your company name and how can they reach you?

Hmmm... Any suggestions for when I try this next time? So replacing U5800 without screwing up the CPU?