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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

yes, bought the from see-ic.com. Can someone confirm if they are fake or not, I Soldered two of these, macos loads fine beacause keyboard light up but I get no video.

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 written that only first led tuns on, second led doesn't turn on, this issue has nothing to do with gpu. It could be a power rail or smc issue. Honestly this forum is becoming useless, most of the answer I read in all topic are useless, superficial and obvious. Only Louis' answer are...

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...

Hi, please share how you fixed the problem, I have two board with exactly same issue, only first led is on, there isn't any visible damage under microscope

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...

do you exclude the power supply? Are you sure that Gpu is causing chime loop? I don't have this Gpu model now, I should order it on Ebay

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...

reflowed u7000 and now works, ram logic board hasn't any problem with ram, I simply received fake garbage ram from Ebay seller

both slot work, but every stick ram I install, macbook detects half of the size. no changes if I install in both slot or only one, it's always detected half of the size

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...

problem fixed, mark it as solved.

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.

I have an iMac 20 2008 that has chime loop problem. when I turn on it does chime sound repeatedly. I have already replaced logic board and cpu. Do you know the causes?

Sorry problem not solved. smc_BC_ACOK is 1.4v instead of 3v. chgr_ACIN is present, already replaced u7000 2 times. If I press with a finger under u7000 area boards boots even if smc_BC_ACOK is low

problem solved, thanks you.