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Hi thank you for advice. Resolder U8900 still no video . issue is GPUVCORE_EN on on pin 38 not present.

Hi thank you for your advice. Resolder U8900, still same issue. Replace U8900 with known good one , still same issue.

This board no liquid damaged. Boot & chime to black screen. no backlight no video. Tried with known working screen, no luck. PPVCORE_GPU 0V. P1V5_GPU_S0 0V. Appreciate your advice.

Hi I have this MacBook board is very clean and no liquid damaged. Wired graphic crashes. Can boot to OSX. tried with external monitor same issue with external monitor as well. Boot with iGPU and no crashing with integrated GPU. works fine. with above symptoms assuming Gmux is fine Tried to...

Hi, This is 2015 27 inch iMac. Chime repeat. Tried with new bios, New rams, new Cmos battery , same chime repeat. Could this be GPU? Really appreciate your help.

Correction. You are right. My chips are not FMDF6808N, its 6708N.

Hi As I said these FMDF6808N chips I bought them Aug 2019. I used them and had 6pcs. I didn't know that they are not available. How ever they are still available in Aliexpress.

HI, This it not a liquid damaged board. Pretty clean. I tried with new battery and known working MacBook. cleaned me region. tried new bios. still same. Any idea?

Hi, Finally I figured the fault and fixed. Thought to share the repair as it useful for others. Issue was with Q2010, LCD HDP inverter. DP_IG_A_HPD_L signal was missing. I pulled Q2010 and found pad was completely burnt. Had to run a wire. all good. So this is solved. I have other one...

Wow. if that is the case I'm lucky as I bought them August 2019. Anyway I replaced these 3 chips and seems they are woking fine as I get 1.7+ V , on coils. Is there any relation other than iGPU between screen connector and external display?

Yes it is weird issue that I never faced. I already replaced 3 FDMF6808N with new chips from mouser. still same behaviour.

Hi Thank you for your reply. I tried NVRAM as well as NVRAM, clean me , new bios using medusa. Tried with external USB and different SSD. Same issue.

Hi All, This MLB no liquid damaged and very weird behaviour. It boots to logo in screen and freezes. When you connect to external monitor, both internal and external displays work fine. works fine with only external as well. but it freezes with internal display only. tried to different...

pin 19 voltage hold only for couple of sec.

my bad. pin 19,20 get 5V, so pp5v_s4 is present. Missing voltage on pin 7.

Also R3509/39/ C3516 all good.

U3500, pin 15 3.3v, 19,20,7 0v. Compare with working board U3500 diode mode values are same.

Hi 2info, I get only 0.2v with USB adaptor connected on L3500. DIode mode 0.166v.

Also J3300 and around components pretty clean and no burnt caps.

HI , Thank you for your quick reply. My question is as i get 20v and and charging with out any issue, should i touch U3100,3200? I thought U2800 works dierectly with J3300 in regards to USB functions. Please correct me if im wrong. Thank you.