Search results

Other coils are not shorted. Caps on PPBUS_G3H and PPBUS_HS_CPU looks fine, no damages. The only way to find damaged one is to inject voltage and use thermal cam. Is it safe for CPU now to inject voltage to PPBUS_G3H with all CPU coils removed? Or I should separate PPBUS_G3H and PPBUS_HS_CPU...

I have removed all CPU coils and short on PPBUS_G3H is not gone. These are readings on CPU rails (CPU side): PPV095_S0_CPUVCCIO_REG_R - 43,0 ohm PPVCCSA_CPU_R - 9,9 ohm PPVCC_CPU_PH1- 2,9 ohm PPVCC_CPU_PH2 - 2,9 ohm PPVCCGT_CPU_PH1 - 2,5 ohm PPVCCGT_CPU_PH2 - 2,5 ohm PPVCCGT_CPU_PH3 - 2,5 ohm...

I'm working on 820-00850 board, it has no signs of liquid or physical damage. Customer states computer just turned off by itself. Some info about board: - Stuck at 5v 0,45A - LDO's on CD3215 are not shorted - PPBUS_G3H is 0V, shorted to groud on system side (diode mode 0,000V) - PPBUS_HS_CPU...

I have inspected LCD flex cable and connector both on motherboard and LCD sides and there are no signs of liquid. I can't see any data lines on corroded are going straight to CPU. Even though it's possible, that CPU died?

Do you mean SMC_PM_G2_EN, PM_SLP lines?

I'm working on 820-00840 board which got damaged by coffee spill. It had corrossion around U3700/U3770/U2890/U3900/R5640/U8210 (pictures attached). I have cleaned it up, replaced U3770 and U2890, repaired broken traces, replaced damaged resistors/caps. Also resoldered U3700 and U8210. Area of...

I have - the same thing. I have inspected board for damaged components but it looks perfect..

I haven't tried BIOS files sent by you because after few days of waiting in the queue iMac doesn't turn on at all. It was untouched, I have turned it off last time, took out power cable and disconneced screen.. today it only has one diode light up on and doesnt react to power button, even if I...

@2informaticos any news?

You have to google for the ASD, it's pretty hard to get it now, but it's possible. Anyway ASD won't solve your problem. I would suggest you to start from hardware inspection. Maybe there is corossion somewhere on motherboard. High fan spin is moslty caused by damaged/corroded/unplugged trackpad...

Ok, thank you. Is there a chance to post it today?

I haven't found any BIOS file on forum for this model. I send you link to my BIOS: https://mega.nz/file/uDYizbDL#SPqYDFC3q8_PEK8_lRlUpGUj37g_XJRHsFDdbohPpNU

Ok, I will. If what, do you have known good BIOS for this board? Or if I will send you my BIOS file, will you be able to clean ME?

No changes, it shuts down randomly showing "this computer restarted because of a problem", then loads OS halfway and stucks.

More than one week ago my customer brought in an iMac 21,5" 2017 for SSD upgrade. I've replaced HDD, cloned all data to new SSD and put everything back together, standard procedure. After few days customer informed me, that computer restarts randomly and then has problem to turn on showing...

I think it's CPU problem, customer decided that we will replace motherboard, I will keep this one for components or future repair.

It was working fine for one day and came back to previous state - restarting randomly, doesn't load or install OS..

It seems, that reflowing RAM chips did the trick, computer works fine, installs OS and boots normally. Thank you, @2informaticos!

Tomorrow i will reheat them with flux and post results.

I have 820-00165 board on my bench which is restarting randomly, showing "Your computer restarted because of a problem..." message. Board was water damaged in the past, cleaned by other shop. Now it has no signs of corossion or damaged components, looks fine. It starts, sometimes boots to the...