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Now I replace Maxim chip and remove R7550,R7510,R7520,R7530 and found that only line is shorted PPVCORE_S0_AXG

I couldnt find any water damage ,green light then red on charger ,macbook sometimes start and fan spins ,sometimes just quater spin,anyway ppbus_g3h is 12.54V ,PPVIN_S5_HS_COMPUTING_ISNS is 12.54V, PP3V42_G3H is 3.4V, and I found that PPVCORE_S0 is 0V and diode resistance is 00.1 ,PPVCORE_GPU is...

Ok works with PC8500 (SOLVED)

No I try few different ram tested in another macbook ,in this one wont take 4GB RAM works only with 2 GB ,i try resetting memory try both sloth A and B same

Now it was water damage around U700 ,now turn on and working ok but only with 2 GB memory ,when I insert 4GB turn on but no chime and black screen (no beeps) I also notice that PPBUS_G3H is without battery 12.55V but when battery is inserted drop to 11.35V but still works

Dont have to test another one ,I have wifi card from A1502 can try it or just will not work

Board was water damage and has bios issue ,reprogram the bios and everything working ok ,just no wifi .Bluetooth working ,just no wifi I mean doesnt see wifi card at all ,not talking about signal

SOLVED reprogram new bios All works now

What I notice that when I have quarter spin the on SPI chip (U6100) I have fluctuating voltage from 3.3V to 0V on pin 5 and 6 and after i fix traces no more quarter spin but no voltage on that two pin

No USb activity ,try with mouse no lights

Fix the quarter spin it was the trace on R5120 but now I have black screen and no chime ,cpu getting hot and ppvcore_s0_cpu is 1.1V

The logic board had water damage around U9420 and when connect magsafe have green light then orange ,fans make looping quarter spin, PPBUS_G3H is steady 12.55V but PP3V3_S0 is from 3.3V to 0V

Kernel panic TLB validation dpi timeout

U3600 Removed and still same ,fan spin loud and stuck on half load the USB with ASD 3S155

remove q3880 still when loading on the half showing forbidden sign

I found that pp15v_tbt short try to remove u9610 and u9410 and u3890 still same

Don't have bios reader for mac ,i order that from eBay ,A1502 mid 2014 ,EMC 2875,serial c02n246jg3qj

Hi it was bios corrupted and after replace MacBook works but showing only 4gb memory instead 8gb and in settings don't recognize mouse or trackpad even if they working

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