Board came in previously ultrasonically cleaned but not super well. There was remanence of corrosion on the bios on pins 7 and 8. Touched up soldering and have continuity from pins 7 and 8 to their corresponding spots. Measured around a bit and noticed PPVRTC_G3H would kind of jump between 3.3 and 3.42. Replaced clock chip now only goes to 3.3 like normal, but it still refuses to start. It doesn't quickly quarter spin but rather it will do the on off on off on thing like 3437's normally do; however, it never stops going on off on off. Could this be a result of crap under a chip like the SMC or where should I look next? The termination resistors around the bios look pretty normal like no burning but have not measured them yet. JTAG looks clean as can be.
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820-3435 Tries to turn on can't, quarter spin
- Thread starter JohnB8812
- Start date
All the rails kind of fluctuate once the fan comes on. For example if the fan goes off PPBUS goes to 8.38 then once the fan comes on it stabilizes to 8.59. CPU Vcore will go all the way to zero when the fan is off then pulse as high as 3.7 volts then stabilize when the fan spins at 1.75
