Recent content by SamMac

Yeah I did I put a new U7501, Q7520, Q7630 and U7600. Many thanks.

Shorted chips Q7630 and U7600 removed both and the shorts where gone from everywhere and resistance values normalised. Replaced the chips (including Q7520) and short still gone. (blessed), made sure everything was still good and then plugged it in. PPBUS was showing 12.6 Volts for awhile then...

should i remove L7520 before injecting the voltage or do it with the coil attached? Many thanks for everything!

Okay my multimeter must've glitched on me, disregard that bit - "showing the same resistances as PPBUS_G3H (which is showing 35Ohms)" The resistance values between PPBUS_G3H and L7520 is 60 Ohms Taking a reading with PPBUS_G3H to ground is also showing 60 Ohms When taking a resistance value...

without U7501 attached PPBUS_G3H is still showing 60 Ohms Every other coil is showing the same or similar resistances when put against PPBUS_G3H With Q7520 also removed it doesn't show any significant changes and no coils showing the same resistances as PPBUS_G3H (which is showing 35Ohms)

only L7520 showing 60 ohms and with U7501 removed it is still showing 60 Ohms

I still have it removed

I am getting 1.150V roughly on PPBUS_G3H so should I start higher say 2V?

Checked if U7501 is shorting the rail, but that seems like its shorting it even with that chip removed. Removing F7140 I can see that Pin 2 is showing the 60Ohms (low resistance value)

trying to check every component on the lines but removing the capacitors still showing the P5VS4 rail as short. Any component in particular do you reckon i should check out?

so replace the component?

Pin 6/7/8 is showing short even with the IC taken off EDIT: above mesaurements with regards to Q7520

okay somehow I find that L7520 is actually showing short with PPBUS_G3H aswell. ANd no some coils are showing 80 Ohms and some are showing way above that L7520 is showing around 2-5 Ohms. I'll double check the situation with the fuse tomorrow. Appreciate any help, thanks.

Quadruple checked Pin 23 and its only giving 0.6V and changes everytime i make an adjustment to the jumper (goes up to 1.5V) Removing either capacitors does nothing to the voltages

Everything but fan and dc board connected. Both capacitors giving the same voltages (1.7V) and looks fine. Won't be able to check Pin 23 since I am doing this at home and microscope is at the workshop. But it seems good as there is continuity. SMC_PM_G2_EN is present with 3.4V