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Thanks for you support. I hit a snag. Have to figure out what went wrong. Had some smoke and I think I fried u7600. Will get that part from Louis and will replace.

This was tough one. I have 3.4v at R5070 I don't get any pulse SMC_ONOFF_L when I short the pads. It remains at 3.4V. No voltage at pin 45 on u2300. Its tough to measure this one. I was wrong previously.

Hello All, Wanted to purchase a couple of older non-working macbooks to learn troubleshooting on and hopefully sell them back. Was wondering what is the oldest Macbook I should consider? Thanks in Advance!

I could reach pins on the border. The 3rd one in I believe its pin 45 and has constant 3.3V. Attached the keyboard and pressed the power button and no change to the voltage. The other 2 , i.e. pins 15 and 30 were Zero.

That is pin 45 on U4900. I cannot find any test points for that.

Got green charger light by moving reseating cables. Testing from square 1. L7320 has consistent voltage across. Going down the power rails PP5VS3 missing PM_S4_STATE_L missing on Q7002 Which goes back to U2300 Chip It all winds up at U2300

4.97v across L7320 While I was moving the board around the charger light came on. reseated the power cables and the green charge light came on. That is my inexperience. Will go through all the rails over again.

Would love to get training. They state no more training on their site. I am on the West Coast far away from NY. Will call them and try. I will look at other parts of the Forum. The videos from Louis do not discuss what you are asking here. They discuss mostly the power rails. If this problem...

Also u7100 is a tiny bit warm after being on the charger for couple of hours

I did it as you mentioned. PM_SLP_S3_L was dead zero I checked across R2811 for the RTC SB_RTC_X1 300mV SB_RTC_X2 227mV

I am guessing you mean to short the pads which does the same as power button. Shorted the pads together, PM_SLP_S3_L was dead zero. Could not find a test point for PM_PWRBTN_L accessible. Under U4900 pin 45 and no test point. PM_RSMRST_L is steady 3.39

On baordview I can find PM_SLP_S3_L on Q7051 and its zero at the moment. cannot find S4_L Forgive me but how do I trigger SMC_ONOFF? And what will that tell me?

I am not quite sure what I should check. Where to check for PM_SLP_S4/3? Where do I check for those 2? At ICH8M? That has lots of pins and not exposed. So not sure how to check that. I followed the diagram and went forward from G3H and S5 and did not run into those 2 above to test. To answer...

Thanks for the hints. I followed your suggestions as per below. PPBUS_G3H 12.65V PPDCIN_G3H 16V PP3V42_G3H 3.42V PP5V_S5 4.97V PP5V_S3 25mV Moving to Q7000 to find PP5V_S3 Pin 4 has 4.97v Pin 3 has 4.94v Moving to Q7012 to see if it opens to ground Pin 6 has 4.96v Pin 2 has ZERO which...

Sorry for inaccuracy. I have measured again and very accurately and its been fun. PPBUS_G3H 12.65v checked at L7900 Missing PPVCORE_S0_CPU_REG, and no screen, no chime... On Q7100 pin 5 I have 12.65 ( PPBUS_G3H ) On U7100 pins 34 and 35 are Zero and both sides of R7112 are Zero and R7112 is...

Thanks for your response. Here is what I have: Power Board 820-2140-A Q7901: PIN VOLTAGE 5 16.26 1,2,3 12.69 4 13.43 D7900: 1 5.08 2 17.38 I have all pics attached. I have done more testing and tracing. Kind of fun until I get to the end and hit a block: Missing...

Folks, I just joined the group. Just a hobbyist. Bought a non-working 2007 17" Macbook Pro. Very nice and not working :) Will attempt to repair. I had green light. Took out the motherboard and no green light now. a few questions if you could please answer. 1- Does the Magsafe charger has a right...