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Hi I have an 00875 board with an exploded C7222. Removed the capacitor and others around it on PPBUS_G3H_CPU. PPBUS_G3H_CPU is still shorting to ground with them removed but I can't locate the short anywhere. Its 0.000v on diode mode. I've tried a little voltage an some alcohol to see if...

Swapped out LP8550. (looking at the state of the LVDS connector originally, I'm not surprised it was dead) now works perfectly. As ever @2informaticos thank you for your help.

Actually.. tried one more time and got fan spin back.. I now have screen active but no backlight. I can see it booting OSX

Nope, get green and orange light but no fan spin. I'll have to start again

Okay, I'll heat it up and give it a couple of taps and little nudges. Its dancing while at reflow

not sure if the SMC didn't survive the heat cycle or I messed it up, but I have no fan spin at the moment. SMC looks like its on perfectly under the microscope. Looks like I'll have to take it back off.

Tested all SPI Bus Series Termination resistors R6110 R6111 R6112 R6113 R6118 R6119 R6114 R6115 R6116 R6117 R6120 R6121 R6122 R6123 R6130 R6131 R6133 R6132 R6128 R6127 R6126 R6125 All test as schematic, can't see any issues with traces on the microscope. Going to reball the SMC now

PLT_RESET_L is 3.3v The BIOS chip was from a dropped 820-00165 (dead CPU) so the bios should be okay but I suppose it could be also faulty. The only programmer I have is SOFI SP8 for doing bios locks on the old A1278/A1286 boards. I haven't programmed the bios on A1466 before, sorry.

Bios chip swapped but doesn't seem to have changed

I've tested with two seperate USB that I know will boot. Neither of them flash continuously like it is booting the OS. Tried with internal SSD removed also, don't think it is trying to boot.

Yes, no image, no backlight

USB pendrive flashes a few times each time I plug it in

The light on the mouse I use is bright and then dims after 5 seconds. I think this is normal as it does it on my iMac just the same. DP_INT_HPD is 0.00v I can't see any pulses or maybe my multimeter is too slow.

On U8300 I get 0v on pin 1 (EDP_PANEL_PWR) but I'm getting 3.3v on pin 2 and 3 R1431 is the pull up resistor for EDP_PANEL_PWR and its supposed to be 100k but tests as 82k on the board. Do you think this might be an issue or is something pulling that down a touch while its attached to the board?

Maybe LP8550 issue or would that still initialise the display if that was faulty?

I don't have a way to test external at the moment but it does power a USB mouse. Tried another screen assembly also

OMG! I've been testing with the wrong charger. Such a noob sometimes, I should have known better. Now turns on, fans normal, CPU heats up but nothing on the screen. No backlight or screen activating

I have an 820-00165 with no fan spin after liquid damage. Orange light and SMC reset goes green and back to orange. Liquid damage around U5110 cleaned up. PPBUS_G3H = 8.52v PP5V_S5 = 4.98v PP3V3_S5 = 3.32v PM_SLP_S4_L = 0v SMC_PM_G2_EN = 3.4v PPVRTC_G3H = 3.3v PM_DSW_PWRGD = 3.4v PP3V3_SUS =...

Fixed and I now have a backlight. Thank you @2informaticos

Yeah on closer inspection, I’d say that was f’d