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Any point in replacing Smc ? . What signals are required for PCH to release PLT_RESET_L signal ? Also is it normal at start it stops at 20ma for a second then jumps to 260ma?.

Yes all Voltages on page 57/58 are present. Heated Cpu to 180c with Amtech 559 flux from Rossman store but still same . Any other ideas?

Yes stable on all 3 pins PLT_RESET_L seems to be pulsing between 40mv to 160mv

Yes VCore is stable 1.8v and 0v on PLT_RESET_L

I changed the probe now getting 32.hkz wave, everythign is dosconnected inc Lio cable but still same and 24mhz at Y1915

Y1915 ig jumping from 12hkz to 25khz, same on PCH_CLK32K_RTCX1

It originally booted but with no backlight but took a few presses of powerbutton and after I removed it from case and placed on bench it then started to boot. I replaced the Backllight Ic and had picture chime etc and began install os . Strangely the wifi acted strange and wouldnt connect during...

Hi No external video ,no chime, Usb activity on usb 3.0 hdd nothing on keyboard or mouse. Also how to check XW7720?. . Current jump to a little over 300ma the immediately back to 250ma. Tried Pram reset with internal keyboard but it didnt respond.

Board was powering up intermittent with black screen (chime) so replaced U7701 and Backlight was ok so began installation of Os. After reboot it wouldnt turn on again so found some corrosion around Y1915. Replaced both resistors and board still powering intermittent. Board stopped turning on...

Does the Smc have to come from exactly the same board or are some inter-changeable?.

Scl does not pulse that I can see on scope. I dont have another batter to compare unfortunately. And no donor board of same number to try a different SMC.

What should pin 7 read ? as it still read pin 7 .276 - .019v even without battery. I have scope there are pulses on sda line.

Hi forgot to mention Sda line was short because of U7100 so changed that and sda came back up, (both sda/scl .53) I also had Checked current sensing resistors and continuity to u7100 and was good. R7050 is ok 10k

Hi laptop had liquid spill as is now not seeing/charging the battery. I have reballed the Smc and replaced u7100 as I was not getting SMC_BC_ACOK. Readings on the batt connector are pins 1-4 = 4.3v pin 5 = 3.3v pin 6 = 3.3 - 0.21v pin 7 .276 - .019v

If I have all S0 main rails what are the next signals to look for on the board?

What I meant was I heat the underside of the board and used original nc-559 flux and reflowed the cpu/pch then afterwards ran ipa under the cpu

I changed Smc but same issues , then lighty reflowed underside of Cpu/Pch now when apply power it quickly jumps up to over 150ma then back to 19ma and jumps between 19ma and 21ma. Is it possible there is a short somewhere? as there was slight liquid damaged on the underside of Cpu that was short...

Hi thanks, many places over the board. I trawled through many posts looking for a link to known good bios dumps for this specific board and couldnt find any.I replaced so far u7200 corroded and no cpu vcore before replacement, C102 was short, U1950 had .5v on pin3 before changing it, Spillage...

This board initially was only drawing 20ma After changing a few components I now have all s0 rails up. Fan spins unit draws 150ma (Occasionaly jumps to over 250ma thern drops back) but no usb activity/Chime. I have reballed the smc and tried a bios file from a different forum (couldnt find...

HI thanks, must be a bad smc as it only works sometimes when heated so will replace the smc. Replaced Smc and all good now.