820-3462 not starting

arnonabuurs

New member
Hi Guys,

I have a 820-3462 that does not start up, no liquid damage it just stopped working. All voltages are present but on L7510 and L7520 i get only 0.7v instead of 1.25. I have checked U7400 its powered at pin 46 at 5V. CPUIMVP TON A and B have 12.35, r7402 and 03 are 181k ohm so seems OK too. L7550 gives 0 reading. I saw in a video from Lewis that Ton A and B often fail but it seems to be working here. How should I go about to troubleshoot this?

All other voltages are OK.
 

dukefawks

Administrator
It IS starting because you have CPU Vcore. 0.7V is fine there.
Does a USB mouse light up when plugged in? Fan spinning?
 

arnonabuurs

New member
Do these machine automatically start up when power on via connector like the Airs? Or they need a keyboard to start?
 
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