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Will that be safe even though the IC is underfilled?

Wasn't able to find any missing components, but everything keeps circling back to U3900. The only thing is that I do not have a stencil for this IC at the moment.

I forgot to mention that when lid is closed, MacBook kernal panics.

Device came in liquid damaged and had missing R701 to CPUVIN and RA603 to PPVIN_S0_GFXIMVP_VIN. Replaced and device boots up normally now. Performed a QC test and gave USC. Everything was working normally with board loosely installed. After screwing down logic board screws to frame, The touchbar...

Just installed a used battery and now getting 22 watts. Being that I had multiple batteries report a similar reading, I assumed the issue was with the board. But it turns out that the issue was all around a bad batch of New batteries. Thank you.

I just tried 4 other batteries all from the same vendor and they were reporting different charging values from 6.2 watts to 9.8 watts. Being that the main parts of the board look perfectly fine leads me to believe I got a really bad batch of batteries.

MacBook came in with a swollen battery a few months ago and not holding a charge. Replaced battery and sent customer on their way. Customer comes back a 2 months later with the replacement battery no longer holding a charge and only had 1 cycle count. Considered it a defective battery and...

---SOLVED--- SMC failed, preventing PM_SLP_S4_L from being present. Replacing SMC resolved board issue. MacBook passes quality tests. Thanks for your guidance on this one.

Before I gave up on this board, I reballed the SMC. No luck. I then replaced the SMC with a donor board SMC and it now powers up to login screen. I'm testing it out to make sure everything works now.

I had my suspicions. PCH_DSWVRMEN reading 3.26v. I'm calling this one dead. As always, thank you for your help.

Okay. PM_SLP_S5_L = 0v to 0v PM_SLP_S4_L = 0v to 0v PM_SLP_S3_L = 0v to 0v Measured with both Multi meter and Oscilloscope. I do get a weird voltage of 0.04v on PP3v3_S3 and 0.002v on PP3v3_s4.

PCH_CLK32K_RTCX1 = 32k RTC_RESET_L = 3.36v PCH_SRTCRST_L = 3.36v PCH_INTVRMEN_L = 3.26v PCH_DSWVRMEN = 3.26v

Thank you for clarifying. Good to know PPBUS G3H = 8.57v PPBUS S5 HS COMPUTING ISNS = 8.57v PPBUS S5 HS OTHER ISNS = 8.57v PPDCIN G3H ISOL = 16.6v PPDCIN G3H = 16.6v PP3V42 G3H = 3.44v PPVRTC G3H = 3.36v PP5V S5 = 5v PP5V S4RS3 = 0v PP3V3 S5 = 3.36v PP3V3 S4 = 0v PP3V3 SUS = 3.36v PP1V05_SUS =...

MacBook Air came in for no power. No signs of liquid damage. All G3H and S5 rails present. Hooked up to DCPS and drawing 0.027Amps. Pulled board out and discovered the 25MHZ Clock Crystal Y1905 had exploded. Replaced Y1905 and Replaced u1900 RTC Clock since it was next to the clock crystal...

I removed the SMC and behold, there was a hole in the SMC. Image attached. I am replacing the SMC now to resolve issue.

PM_SLP_SUS_L = Stays at 3.3v PM_SLP_S5_L = stays at 0v PM_SLP_S4_L = stays at 0v PM_SLP_S3_L = stays at 0v PM_SLP_S0_L = stays at 0v

It took a while to revisit this board but I am back at it. I have not replaced the SMC yet. Using both orginal 85 watt magsafe 2 and DCPS with genuine 85 watt magsafe 2 connector attached. PM_PWRBTN_L drops from 3.4v to .04v when triggering SMC_ONOFF_L PM_RSMRST_L = 3.3v PM_SLP_SUS_L = 3.3v...

Sounds good. Will follow up after SMC Replacement.

Currently working on a 820-3437 where power supply is pulling .02Amps. Device has no signs of liquid damage. Always present power rails are present. SMC_RESET_L is present. PM_SLP_S4_L is missing. Board does not boot in SMC Bypass. I discovered the tiniest amount of corrosion under SMC on Pad 64...

I finished the repair last night and performed an Ultra Sonic cleaning before I closed up. Came in this morning, inspected all of my joints and reassembled the MacBook Pro. Ran a quality control test for an hour. The MacBook Pro is no longer having sleeping issues, let alone any power issues...