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imac 27 late 2013 shut down after few hours ( sometimes after 3 hours, other times after 30 minutes ) and doesn't turn on. To turn it on again, i have to unplug power cable for at least 30 minutes. When it shut down, If I don’t unplug power cable and plug it again, it doesn’t turn on. Have you...

Good morning, I need to know which resistor I have to change to replace 084 chip with 005 chip on 820-2915 (late 2011 2.4ghz) with Hynx vram. Could someone post a complete list of resistor configuration for 1286 and a1297 for 6750 and 6770 with samsung and hynx vram? On my board there is only...

MacBook Pro 15 820-2850 vertical red lines when it uses intregrated GPU, dedicated gpu works perfectly. What could be the cause? is more probably mux or failing intel gpu?

820-3787 MacBook Pro 15 no liquid damage, PPVCORE_GPU is about 60mv, I replaced u9300 but no changes. Macbook boots os fine, keyboard backlight turns and I can hear OS sound, but there is no backlight and no video. GPUVCORE_EN is 3.25v GPUVCORE_PGOOD is 3.2v

820-3437 early 2014 no fan spin, green and orange light, no liquid damage, u6100 looks a bit corroded but I can't see broken trace. all g3hot rails are prensent PP5V_S5 present PP5V_S4RS3 0v PP3V3_S5 present PP3V3_S4 0v PP3V3_SUS 0v SPI_CSO_L stable 50mv PM_SLP_SUS_L 0v Owner used a not...

I replaced the gpu in 820-2915, I tested many hours with valley benchmark, shipped it back to customer. Customer went to Apple Store to mount HDD and then called me the same day because macbook doesn't turn on. I received macbook back: No visible damage on the board, if I try to turn it on...

I received a Mac mini 2009 that chime but It only show white screen. Plug in an external hdd I can see that I neither try read the hdd or load the os, it's like it stucks after chime, even if I press ALT nothing show on screen. I tried to change ram, installed another bios, changed lcd cable...

Macbook 15 has a strange issue, it works for a while, but after a few days ram are not detected and starts to beep. Removing and installing again ram fixes the issue. this issue is happened three times in a week. Is ram slot going to die? How can I fix this issue?

There are many macbook 12 with SSD problem, macbook doesn't detect Ssd, neither in disk utility or system information. It is a common problem in this model. Is Ssd dead after a short time? Has anyone discovered the cause of this issue. I have checked Ssd voltage and are present and I tried to...

I bought from "Golden Chipset LTD", they sell Gpus on aliexpress and in their website www.hklrf.com. I received it but they doesn't look new. there are probe scratches on surface and flux residues. Is this seller a scammer? Are these gpus fake used recalled polished gpus and sold as they were new?

820-00239 touchbar 13 macbook has a short on pp3v3_g3h, I can't find the short, I removed SMC and hall sensor and other capacitor because they were getting hot, but I soldered them back because they were not shorted. I use an external power supply but all resistor and capacitor on pp3v3_g3h line...

820-2915 after Gpu replacement I got no video, It chime and loads os since backlight turn on. pp3v3_s0GPU is low 0.6v pp3v3gpu_SS 3.3v pp3v3_s5 3v3v pp3v3_s0 3.3v pp3v3_S0GPU 0.6v (diode mode 0.500v) already replaced q7870, u9270, q7812, q7810, q7872

I spent 320$ for 10 GPUs for macbook 15 2011 (5 x 6490m and 5x 6750m) I received them but it's written Made in China, date 1204 and 1208, while in the original broken one it's written Made in Taiwan. Are them fake? Seller told me that AMD has 5 manufacturers, 2 of them are located in china, is...

820-3115 was not turning on, the owner used a faulty charger. I replaced DC-in board because and now it turn on but doesn't chime. eps id CPU gets hot usb has 5v it beeps if ram are not present Could be a corrupter bios or a faulty SMC damaged from faulty charger?

iMac 21 2009 820-249 has a short in pp3v3_S0 (vdrop 0.0) and in pp5v_S3 (vdrop 0.015v), I tried to find the short with external power supply but nothing gets hot. (I used thermal camera) vdrop in pp5v_S0 = 0.435 vdrop in pp5v_S5_LDO = 0.470 vdrop in pp3v_S3_LDO = 0.800 vdrop in pp3v_S5_REG=...

I have two iMac 21" received by two different customer, they have both the same problem. Logic board sometimes doesn't turn on (only first led turns on the board) when that happens, I have to unplug power cable for fa while and then iMac start to work normally. When imac turns on, it works...

I have a MacBook Pro 13 2010 that doesn't post, u6100 has 0v voltage on pin 5 (SPI_MLB_MOSI) and on pin 6 (SPI_MLB_CLK) and on pin 2 (SPI_MLB_MISO) vcore is 0.99v ppvcore_s0_cpu voltage drop is 0.027 Macbook was liquid damaged, before cleaning it did 9 beeps "3 short beeps - 3 long beeps - 3...

I am going crazy, I received an iMac 20 2008 that chimes but doesn't post, I mean that iMac chimes but it doesn't read internal or external drive, so I have supposed it doesn't post. if I connect lcd screen it does chime loop (iMac does chime sound every second and obviously no image) what I...

820-2879 not charging, battery is detected but always shows 0% level. Do you you have any suggest? Second problem is that if I install 2 sticks of ram of 2gb each (2x2gb), macbook detects 1 gb for each slot(2x1gb). Is a ram slot dead? is there a fix for this? macbook runs only with battery even...

I have a MacBook Pro retina 15 2012 that stuck during boot, keyboard lights up but doesn't reach desktop. I have already reflowed u8900 and u9100. cpu and Gpu vcore are perfect.