Search results

OK, replaced U7090 Rebuilt traces Now I shifted focus to Q7010 PIN 5: 15.10 PIN 4: 14.9 The gate is way too high. R7010 and R7011 are correct ohms R7012 is correct Could this be D7012?

No green light, no fan spin. New flex cable tried and no go. U7090 looks terrible. See image below. PP3V42_G3H is 0V needless to say 0V at L7095 Tons of corrosion at U7090. I don't like to just throw a board into a US cleaner but I am considering doing so on this one. I can't even measure...

Ok informaticos Problem solved. Image was present on internal LCD (my error on the title) XW7720 was the issue. Bridged the broken trave. LCD works now. Its not pretty but it works. Conformal coating next to protect it but it is secure.

YES Image is present and boots to desktop

Machine boot and works fine on external monitor No water damage J83000 looks good F7700 is good (conitinous) BKL_EN at R7731 is 0V Q7706 PIN 4: 8.59V PIN 3: 8.35V Q7707 PIN: 2: 3.33V PIN 5: 0 V XW7720 No continuity between: PPVOUT_SW_LCDBLKT_FB test point and D7701 PIN 2 ??? open switch...

Restarts and boots to desktop. I was even trying to install a fresh copy of Catalina but I think it may be shutting down 3/4 of the way through the install. I'm not sure because it was an unattended install and when I came back it was at the old desktop. The new install did not proceed...

U3540 is severely corroded PP3V3_S5: 3.3V at C3540 but bouncing at pin 1 U3540 Dry scraped away the corrosion, no alcohol, nothing at pin 1 Plugged it back in, boot looping stopped. Damn thing booted right to desktop. U3540 is wifi? I may just replace this (but I don't want to unless I...

Done and working. Thanks again!!!

replaced U7701 It worked informaticos!!!! Display now works! Should I remove all jumpers and put back resistors? booting to desktop No boot looping.

i just ordered a display assembly leave all jumpers in place correct?

OK done: NOW: BKL_EN= 2.83V BKL_PWM = 2.83V No backlight. I can still see the image of an apple logo but it is now boot looping and not getting to the desktop like before. But, no backlight. ...? LP8550

Will do, can you tell me what you are considering? I was thinking: 1) high resistance at R7704 (damaged resistor?) 2) Short at C7704 ---> will need to check diode to ground 3) Short somewhere on EDP_BKLT_PWM ---> will need to check diode to ground 4) Internal issue on U7701

BKL_EN= 2.83V BKL_PWM = 0.0V

Keep tied together pins3/4 of Q7707 ?

XW7720, I have never worked on this switch trace before. I don't know what I am looking for in terms of integrity. D7701 Diode to ground 1: 0.45V 2: 0.65V R7717-R7722: 0.64 V Diode mode to ground on all pins I saw this image: do I just scrape at the circular area and run a wire as below...

L7701 is 8.57V

Try 2-3 times PRAM reset --> no change when I did this Also try starting in SMC bypass mode ---> no change when I did this Anything to check on EDP_BKLT_EN missing Tied together pins3/4 of Q7707 ---> still no backlight

Board boots to desktop. I can see the log in screen but there is no backlight. F7700 fuse good, PPVIN_S0SW_LCDBKLT_FET=0v EDP_BKLT_EN=0 BKLT_PLT_RST_L=3.3v No short on Q7707 PIN 5 LED driver?

Changed fuse. Checked diode. Checked resistors indicated above. Connected machine. Machine now boots to LCD. Solved! Thanks informaticos!!

2.67V at r8360 F7700 measures OL across it it should be continuous no? like ~0.3ohms 8.67V at pin 1 ...0.30 at pin 2 of the fuse fuse is blown? that would explain the cracked inductor i just can’t believe that is it i checked 10 times to be sure i don’t get an image-at least one I can see or...