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ok, i didnt have to short SMC_ONOFF_L to ground.. when i plug the battery, plug the fake 60w charger.. I see orange led and the fan still spin on and off... i might have a psu somewhere but i havent really used one..should I try? (16.5v 4A will it work? i have a magsafe cable that i can hook...

oh my fake charger is only 60W... can i just connect battery + fake charger + short SMC_ONOFF_L to ground instead of a power switch? I dont have it mounted inside the case right now...

you mean i should not use real charger to troubleshoot this bad board now? I should use battery + fake charger to connect to this bad board now?

Changed both Q7080/85 and now 12.5v at F7040 seems to be more stable but i still find occasionally my multimeter will see it drop below 2v and bounced back (maybe it goes to zero but i think my multimeter is too slow), but voltage not as cycling as before. Fan still spin up and down. Fake...

ok i dont know why.. but i put back F7040, on real 85W, now fan spin and stop, DELAY, spin and stop....sometimes the delay seems longer and sometime shorter.. With a fake charger, voltage at F7040 is 12.5v, no fan spin.

85w genuine used. Did not try fake charger it is 0-12.6v cycling.

removed 7040 pin 1 = 12.5v cycling = C7040 voltage. Q7080 pin 1 is 16-16.3v which goes into R7085 pin 1 but pin 2 is cycling... bad Q7085?

1 = 15v cycling (measured at R7086 pin 2) 2 = 16.5v 3 = 4v 9 = 0.03v 12 = 3.4v 13 = 3.4v 14 = 3.3v 15 = 0.05v 17 = 12.5v cycling 19 = 5v 20 = 5v 27 = 16.3v cycling

Board looks very clean. PPVCORE_S0_CPU = 0v and diode mode = 057. PP5V_S0 = cycling. PPBUS_G3H cycling. If removed F7040, pin 1 cycling U7000 pin 3 = 4v pin 14 = 3.3v pin 27-28 = 20.8ohm pin 17-18 = 3.3ohm

tried various known good ram sticks. where should I look?

i have broken some traces on the PCH itself... perhaps i have even killed the PCH but the machine chimes when power on..

hmm... how? I think i have screwed up by over scratching the U1800... How come I dont see things on the screen if I jump 3.3v into LCD_BLKT_EN, LCD_PWR_EN, LCD_BKLT_PWM ?!

Oh I forget to mention, U9600 isnt presence on this board, it was removed and then hardwire bypass. The bypass was working before I scratched up the U1800.

If I left PP3V3_S0 connected to LCD_BLKT_EN, LCD_PWR_EN, LCD_BKLT_PWM: - PP3V3_SW_LCD is 3.3v - Pin4/J9000 = LVDS_DDC_CLK = 3.3v - LVDS_DDC_DATA = 3.3v The screen was working until I scratch up and damaged U1800... Should I remove PP3V3_S0 and test again? but PP3V3_SW_LCD is derived from...

There is no PP3V3_S0_LCD on this board? diode mode to ground: LVDS_DDC_CLK/DATA = 370 i tried to connect PP3V3_S0 to LCD_BLKT_EN, LCD_PWR_EN, LCD_BKLT_PWM, I can see backlight but there is nothing on the screen.

Yes I did with LCD connected, it now chimes with only black screen, nothing shows even with flashlight shinning.

Now both LVDS_IG_BKL_ON and LVDS_IG_PANEL_PWR are 0v.

I was trying to do this but failed.

I messed up trying to scratch the U1800 in an attempt to find NC_LVDS_IG_BKL_PWM and damaged the LVDS_IG_PANEL_PWR pin. Is there another signal pin that i can use to just hardwire this? can I use PP3V3_S0?

Replaced Q9706 fixed the problem. Backlight is back on and machine boot up. Thanks for the help.