Search results

I've asked but so far I haven't find A1502 to test.

the guy said he was in NY and screen stopped working suddenly. I don't have another A1502 at the moment but I can look for one.

Hi, Board = 820-3476-A I've been reading backlight sticky post and looking at potential failure using the two pics with all failure listed but I can't fix that one. There's no backlight, I see apple logo and login window if I apply light to the lid. U8300 PIN1 = 5.14V PIN 2 = 0V PIN 4 = 5.14...

Thank you. I did read the post before but I didn't solder wire, maybe I should have started with that instead of tweezer. Now I've solder a wire, when I connect to GND quickly, PM_PWRBTN_L drop to 0.3 and iMac boot. I've placed B2032 back. iMac is working correctly. Thank you for your help.

Using tweezer, I connect C600 ( SMC_ONOFF_L ) to GND and I monitor PM_PWRBTN_L with Multimeter, it's stays at 3.41 V

Ok, Ill save those in my do to list. PM_DSW_PWRGD = 3.42V PCH_DSWVRMEN = 3.17V PM_RSMRST_PCH_L = 3.31V PM_PWRBTN_L = 3.41V

I look at page 18/113, I can't find another RTC. PCH_INTRUDER_L = 2.99V PCH_INTVRMEN = 3.17

SMC_ASSERT_RTCRST = 0V PPVBATT_G3_RTC_R = 3,07V PPVBATT_G3_RTC = 3.08V RTC_RESET_L = 3,28V C2210 PPVOUT_G3_PCH_DCPRTC = 1.55V PCH_CLK32K_RTCX2_R = 0.25V PCH_CLK32K_RTCX1 = 0.35V

Thank you. I have 3.29V on PCH_SRTCRST_L C1802 - 1 R1802 - 1 & 2

With BR2032 - Doesn't boot, even if I remove power cords. Without BR2023 - It boot but need to remove power cords for 15 secondes after proper shutdown. Fans always full speed on.

Hello, Customer said iMac stopped booting. She's not using it a lot. Last week, she wanted to turn it on... no sign of life. She went to Apple, they said it's dead...need to buy a new one. I remove the screen, I can see led 1 on. I tried to bypass power button, doesn't help, SMC reset...

Hello It took me a while to successfuly write ROM as I was always getting error during the process. I finally manage to do it and that fix the problem. thank you very much for your assistance and patience. All the best for 2023. Thanks Sam

Hello again. I got the Medusa. ROM is ok, I can read it, i can see hostname, language, version... so it looks ok. USB tester is red, doesn't flash green. Any idea what else I could try ?

I've ordered Medusa. Should have it begining of next week.

You mean, it can NOT for this model A1502 ? I don't have Medusa. I should desolder the BIOS, write it with the code you sent and solder it back ?

Thank you. I've check all traces are ok, can't find the culprint. what is J6100 connector for ? There's nothing connected to it. So I should try the BIOS path then ? Customer said he tried to power it on last week, didn't work... he tried the day after and it worked and there was a message to...

thanks. I don't have another 820-4924-A to test BIOS. Can I take from other board ? Is there any compatibility to check. I have a flash reader, I can unsolder the BIOS to make sure it reads correctly. I've checked those resistors, they are ok. R6110 ok 22 ohm SPI_CS0_R_L R6111 ok 22 ohm...

Thanks. With your experience, faulty resistor is most likely short or open ?

PLT_RESET_L 3,35V, what's PLT sounds for ?

thank you. not sure what's going on. i've measure again, first time I had 0V on 3 & 7 and 3 min after I had 3.42V. Now it's stable, 3.42V on test point. If I want to test it, I only need to connect screen connector and magsafe, right ? I did it.. still nothing.