Recent content by lagadatorumea

Ok... master.. Thank you.. Noted that down :)

I manage to find the problem and the computer works now. by using the infrared camera. Strange the capacitor was shorted for Audio and pulsing for S_0 state. Then again, I might have missed checking what state the MacBook was in, I only checked the start-up circuit. see image for the shorted cap!

PPBUS_G3H 12.6v PPDCIN_G3H 20v PP3V42_G3H 3.42v SMC_RST_L 3.3 PP3V3_S5_AVREF_SMMC 3.3 SMC_BC_ACOK 3.3 PP3V3_RTC 3.3 PCH_SRTCRST_L...

Yes, CPU badly shorted... after double checking... Thanks, Master... Case closed!

I see.. ok.. Yes, might be the CPU.... it took ages to change out the U7220... the whole board was bloody hot.. could be when I did the change.. unless it was shorted as you said.. will double-check and revert back. thanks master

Hi Gents! Water damage A1990, 820-01827-A Stuck at 5v. Short on PPBUS_G3H. The problem was U7220 (CPU PHASE IC 2) changed the IC. U3200 outputs: LDO3_3, LDO1_8A Now I have 20v and stuck on 0.052 AMP, but missing VBUS (U3200) shows 0v... How is that possible? Thanks

Yes, it drops to 335.0mv

Thanks @2informaticos I learned something new there with R5115/16 I triggered SMC_ON_OFF_L 3.3v - 0v - 3.3v.. Still nothing... What's next you suggest? On the Y1905 clock chip I get 50 mhz.. is that correct value? Shouldn't it be 25Mhz.

SMC_ONOFF_L = 3.3 PM_RSMRST_L = 3.3 Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L at same time. Its not possible, the board is on two sides.. How?

PCH_INTRUDER_L = 3.3v ON Pin 1 and output Pin 2 to PCh = 2.4v

Master @2informaticos Please see following SMC_RST_L = 3.3 PP3V3_S5 = 3.3 PM_PWRBTN_L = 3.3 SMC_ON_OFF_L = 3.4 PP3V3_S5_AVREF_SMC = 3.3 PPV_RTC_RST = 3.3 PP5V_S5 = 5v PM_PWRBTN = 3.3 PPVRTC_G3H = 3.3 PCH_INTVRMEN = 3.3 PCH_SRTC_RST = 3.3 PCH_DSWVRMEN = 3.3 PP3V3_SUS = 3.3 PM_BATLOW_L = 3.3...

Thanks Master... Good Point.. I should have reballed it first and then used it again.. I did though do a reflow, and nothing happened that's why I changed it.. Working on the board now and will post some Voltages shortly within the next few hours.

So I changed the SMC and now have Greenlight/ orange light on the charger(8.5v on PPBUS_G3H). As I suspected 8.1v it's an SMC failure. I Will post new Voltages in a bit. Checking the board now.

Im going to change the SMC and we see what we get... 8.1v seems like an SMC issue... I'm also missing SMC_RST_L

No Green light on the charger PPBUS_G3H = 8.1V SMBUS_SMC_DATA = 3.3 SMBUS_SMC_CLK = 3.3 SMC_ADAPTER_ENABLE = 0 PP1V2_S5_SMC_VDD = 1.2 SMC_RST_L = 0 (No corrosion around J6100)