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Seems bad smc. Replace it. Reball will not solve the problem. Smc_reset is ok?

On both cpu coils I have 42ohm Also I realized now that green light appears 9 seg later after I plug the magsafe adapter. Thoese 9 seg it has no magsafe. I bridge F7005 to R7020 to test and now magsafe appear instantly but stil same problem. All rails appear for 0.2 seg only and later not...

This board had several componentes burnt like: F7005, R7010 that I didnot replace at this moment I just remove it. U7000 and U7001 and SMC replaced. After that now I have ppbus stable at 12.59V and 3V42 stable and all rails appear and cpu core too for 0.1 seg but not pulsing later. Customer...

This board seems very clean and has all rails. CPU core - 1.70 but CPU is only a little bit warm. Always used to be hot. No mouse light. BIos and lock chip seems very well. Any idea why CPU is not hot?

You can test retina board 820-4924 with retina 2013 screen. Yes it works!!! You need to boot from usb or ssd and you will not see how the OS X load, but after 1 minute you will see the desktop. So retina 2013 screen is OK to test 2015 models!

Did you check one wire circuite? Do you have 3V42?

Can I fit 820-00165 right? All compatible?

Yes, it was A5 ball bad trace. Now have backlight. Had do remove the chip to run a wire. Do you run the wire without removing the chip? And also this happend on Pro too?

As I said All 6 return lines - 0.630 with red to ground In this board the resistors are just next to the connector. And 0.630 means they go to the LP8550. Also go to lvds connector.

280-3437 no backlight. Can see blinking folder LCD backlight - 8.57V Enable pin - 2.84V PWM - 1.47V SDA and SCL - 3.3V All 6 return lines - 0.630 with red to ground Already replaced 2 times LP8550 and tried 3 different working screens. Have no more ideas.

Yes, has sticker on RAm and DC is 1144 on 0005

Already tried that and no results. Black screen. Gpu 0005

820-2915 reboot each 6 seg. With RAM Cpu core present but each 6 seg dissaper for 1 seg Without RAM cpu core always present. Any idea? It is not liquide damage board. Just talked with the customer. He worked with the laptop and shut it down and next day turn on wihtout image.

Ok, told me he power the board without isl6259 This damaged both mosfets, low and upper. But this can damage more things?

History: Other guy replaced the isl6259 but he burnt both mosfets someway. So, I think in some time ppbus recived 20V directly from ac adapter if upper mosfet was burnt firstly. Can that burn some component on ppbus?

I had some boards where gpu replacment doesnot work and vram yes.

Cpu vcore also pulsing. Now told me that fan run fast last time and opened the laptop to replace the cpu compound and clean the fan.

I replaced the SMC again and same thing. Pulsing each 6 seg.

820-3115 Customer says that one day it just dont power anymore. No short on coils.

Yes, 3V42 was shorted because of SMC. After replaced, this rail is stable.