Hello wonderful people! Congrats on the new forum - looks great.
I have a problematic laptop here which I need help with.
The history...
Thanks.
I have a problematic laptop here which I need help with.
The history...
- It DEFINITELY has no liquid damage
- The person I got it from claims that it was working perfectly, they changed the battery (for a non-genuine one) and then the problem appeared
- Upon opening the laptop I was immediately aware of a gold-sparkly substance which was literally spread all over the board. It turned out to be a thermal paste that they had used on the CPU heatsink. I have no idea how they managed to get it everywhere.
- After studying the board relentlessly under scope and confirming absolutely no signs of corrosion - I elected to ultrasonic it in my crest to remove the nasty paste. I did test a small clump of the paste between the probes of my multimeter - it doesn't seem to have continuity or even register a resistance, so I think it is unlikely it shorted anything out.
- You can plug it in, or use it with the battery and the same thing happens either way.
- When power is applied, the fans spin for a moment and then stop. Nothing else occurs.
- Occasionally the fans will spin for a while before stopping, sometimes they barely move.
- Once in a blue moon, the fans spin up to full speed and remain that way - nothing else happens.
- I have only been able to recreate this twice.
- I have narrowed the problem down, i think...
- Working down the rails, the first S4 rail not to be present is P5V3V3_S4_EN
- This seems to be created by the presence of SMC_S4_WAKESRC_EN and PM_SLP_S5_L, NEITHER of these are present and I cannot figure out how they are made.
- Working down the rails, the first S4 rail not to be present is P5V3V3_S4_EN
Thanks.