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I ran diode mode to ground and most of the lines are shorted I think PCH needs either reballing or replacement, the coils are also on low readings the other coils read well, I will try to reball the PCH to see if that does anything.

Looking for some help here with this macbook , the owner stated that it was working ok then all of sudden it turned off and wouldnt power on again. What i got on the USB AMP METER IS 20V ---------- 0.27AMP And 7.78 WATTS I realise that the fan spins and U1800 gets super hot and no boot , I...

To me CPU is dead or it needs reballing.

I have another board here good working one , and I compare the readings , And Yes the CPU is Partially shorted, L7670 5V is present L7690 3V3 is also there L7030 12V present, all the other coils are 0v

Here s a picture of the corroded area that I found , everywhere else was neat.

Hello, This macbook came in today not booting , I plugged my amp amp meter and Device is charging normal pulling 20V 39W and 1.48 Amp but if press power button , there s no boot , press caps lock key no light and no dim light on screen, I proceeded to open it to run an inspection and found...

UB400 doesn't get 1V1 LDO when you connect charger to another port

That Macbook got wet very badly , It seems to be a layer issue, cause i can feel when i place the probe to run test around the area of U3200 if i press the area, around feels like a sponge like its bouncing back and forth , I think that i will just hand it back to the customer. I have fixed...

All the other ones are giving me 0.000 only UB400 Giving me the correct 1V1

Understood, I am getting 1v1 at UB400 and all the other LDO Voltages are normal, but i am still stuck at 5.09V on my USB amp Meter.

Is U3200 the power port Or UB400? Cause I only get 1v1 at UB400 please advice.

I forgot to mention that All the 4 CD3215 chps Have been replaced by new ones .

All AWAKE and SLPS2R voltages is present and normal When I Check LDO voltages for CD3215 chips. I found U3100 , 3200, as well as UB300 PP1V1_UPC_XA_LDO_BMC 0.000, without voltages while all the other voltages are present , that same PP1V1_UPC_XA_LDO_BMC diode mode reading is 0.486...

Ok, let me check that.

Ok, let me get that.

Ok , Sorry If I did not clearly express that but 3V3_G3H_RTC and PP3V3_G3H_RTC_REG_R to me they are two different power rails from my point of view , And I can see L6900 and 6901 is connected to the power rail PP3V3_G3H_RTC_REG_R is providing 3.373V , but the 12.28V that I mentioned in...

P3V3G3HRTC_FB = 0.869V P3V3G3HRTC_SS = 0.869V I am going to rerun the voltages again , but I am having a very strong feeling that my U6903 that i got from Ebay maybe is not a genuine chip , I don't wanna pull it from my other good working board as I keep them to compare voltages when they...

I was also shocked too as i was expecting 3.3v there and that was why I got my known good board to compare voltages and the good working one was giving me 12.65V L6900 and 6901 is giving me 3.373V

I have another good board the same type also when i measured 3V3_G3H_RTC I am getting 12.65V, I wonder if my new U6903 that I ordered on eBay is working. Any other suggestions? Thank you very much.

I forgot to mention that , That was the first thing that I did , 3V3_G3H_RTC before I removed the chip was short to ground Diode mode was . then as soon as I remove the chip the short was gone then after I replace the new chip 3V3_G3H_RTC in diode mode was 0.311 and measuring 3V3_G3H_RTC...