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Yes, i have light on mag safe, U1900 should be good, I get 3.324v on PPVRTC u6100 pin 1 0.053v pin 2 0.061v pin 3 0.000v pin 4 0.000v pin 5 0.025v pin 6 0.025v pin 7 0.003v pin 8 0.000v

820 3435 no power, machine was liquid damaged, but over all the board looks to be in decant shape. I have G3 rails, I have s5 rails, missing s4. 0.00v on P5VS4RS3_EN_R, also 0.00v PM_SLP_S4_L...

What makes you think the FET is bad? What type of graphics issues are you having, have you looked up the part number of the component to determine what type of mosfet you're trying to test?

Thanks Duke and Aprendiz, it was bad u7000, up and running!!!

Pin 3 on d7005 I get 16.77v, pin 1 of r7003 16.77v, pin 2 of r7003 3.8v. I pulled r7003 seemed like it was reading a little low, replaced, same storey.

Update, I was measuring on the wrong chip yesterday. U7000 ACOK has 2.32v without batt, and 3.19v with batt. I have 3.88v on pin 2, 3.4ohms between pins 17/18, and 21.4 ohms between pins 27/28.

3v42 is present when battery is connected PPBUS 7.38v with batt, and jumps like hell between about 3-6v with out batt. 0v with and without batt on ACOK.

820 2849 no light no mag safe when battery is connected, as soon as battery is disconnected green light returns. Machine will boot, but only if I plug the battery after magsafe is plugged in. I have 3.42v on PP3V42_G3H...

I have voltage on G3H rails, and s5 rails. All s3 rails are missing. I get 0v @ gate of q7813 for PM_SLP_S4_L, line is not shorted. MCP issue possibly, am I over looking something here....

Thanks Duke, you are the man! It was R5111, pad on SPI_CLK_R was shot, running now.

820 3023 No power, i have green light on mag safe, quarter fan spin, board looked over all in good shape, I replaced Q5060, it was the only spot corroded. Can't find any shorted lines. PPBUS_G3H 8.41v PPVIN_SW_T29BST pulsing .121v-.007v PPVIN_S5_COMPUTING_ISNS 8.41v PP18V5_DCIN 16.41V...

Duke looks like i made a rookie mistake, PPBUS_G3H read 12.59v, when I first tested it, so I moved on. Tested it again today and if I hold the probe there for a few sec it power cycling for 12.59v, 10.5v, 11.5v, back to 12 again. Line is not short, I changed u7000 still power cycling...

Yes, the decimal jumps back and forth making it 3.7 then 37v. Every time I retest voltage on that line, it changes it might say 4.2v and the decimal will once again jump back and forth from 4.2v to 42v, or 2.7v and 27v, so on and so forth.

820 3330 PP5V_S5 voltage decimal jumps 3.697-36.97v, and I get a lightning bolt in my fluke. No water damage, is this an SMC issuse... Diode mode readings PP5V_S5 .432V PP5V_S3 .400V PP5V_S0 .401V PP3V3_S5 .140V PP3V3_S3 .343V PP3V3_S0 .293V

No power now, hit u8900 with some hot air, no change, should I replace, or just resolder...

Yes, diode scale is what i am referring to.

Apple Cert will NOT give you access to ASD, GSX, or Atlas. Only businesses that are AASP are granted access to the software and databases.

820 3332 PP1V5R1V35_GPU_REG shorted 0v, 0.085v resistance, heat sink gets hot enough to burn you while checking voltage. Is it safe in inject current into a GPU low volt line like that, or any advice as to sourcing out what causing the short? Machine powered with no video twice, booted normally...