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Any idea what could cause s3 not to be present? No shorts on circuit. Struggling to determine, why it isn't coming from the connector in the first place. Is it because of IO board (unlikely) or is it because of another component up stream?

Also, is it not pertinent to go in the order of which they are listed on the schematic, as they will not be present without the rail prior? dukefawks

There is no pulse at L7520, this is assuming my scope is set right... There is not short on that rail either. It looks like, it has a direct line from the connector to the io to L7520... Nothing there either.

So, I sort of muddle my way through board repairs. Obviously looking for visual ques of where to begin. Sometimes that is not a luxury I have so I begin with power rails. My question is elementary, and I know I shouldnt be doing what I do if I don't already know this, but how do you determine...

Having some issue isolating an issue on 5v_s0. No liquid damage, no visible damage. Sent to me, orange light, no boot. Opened it up, no fan, tested no 5v_s0. 3v3_s5 present. Any ideas. Tried a monkey see monkey do at u7200 and changed it. No s0 at pin 16, ppvin_s0_cpuvr_vin=8.56v. There looked...

I have a 3437, that seems to be acting strange. The charge light does not display, however with the battery unplugged and the MagSafe plugged in, it will boot up as normal, after a while it shuts down however. No sign of corrosion or drop damage. Any idea?

Got it, conformal coated the jumper, all is well. Thanks!

So I found a like donor board, excavated around the "good" probe point to see where it went. Couldn't really see where it lead, so I pulled the smc and tested continuity from ball 42 to the components. for whatever reason, The trace that leads to C4920 from the probe point, though missing, the...

The battery is A1406 which I believe is the correct model for the mid 2012 11" airs. Any other sucggestions? If the customer just ran it despite the temp sensor, would it be detrimental?

All works on this computer but it keeps throwing this code: 4sns/1/4000000:TB1T-0.000. Any idea? Think it's a temp sens... but the TP works fine.

When I received it, the problem was that the wifi didn't work. However after plugging it in once and it turning on/booting once, everything went away (no fan no power etc). Something was spilled on it, I sent it through the US cleaner. Could've been something under the smc at the time, but it's...

Have a 3208 with a burnt probe point. I believe it's probe 815. It's just south of the smc and seems to be part of the smc net for ball 41. It's burnt, I excavated and it took me down a layer. Is this the piece I would jumper pin 1 of c4920 to? Or is there another option? I feel like it could be...

Working on a 3208. Found a broken off resistor (R5250), and ripped up pad (1). There are hundreds of things running to this one spot. Am I fucked? Could I bypass the location somehow by tying in somewhere else?

Anyone have any idea what this means?

Is this the appropriate place to ask where I can get the boardview software that Louis has? Linux is wretched. It works and has made me some money but I need something not so irritating to use.

That's what I was afraid of. Nothing, no reading. I will say though, as an anomoly, the fan just started spinning for the first time for about 10 seconds... does that mean anything?

No Title Having some issues dialing in the scope. It doesn't appear to to register but my scales could be out of whack and they're not adjusting right.

3.42 at pin 8 of u6100, j6100 I removed before posting original question. Just to be safe. PP3v3_sus is reading 3.34. Could it be the bios? If so, would one from a 3437 work on this board?

Smc_lid is reading 3.42v I can't remember if this is what it should read with the board out.

Also 17.01 all along the dcin circuit. Is this low? Should it be around 18?