hello,
sony laptop mbx-130 ms02 does not power up there is no short on the 19.5 rail also 3.3v and 5v all ok.the power switch does activity to ec+kbs kb3910sf b4 pin no 2 (pwrbtn) i see voltage drop when you press power button but does not power up .one thing notice that when you put battery the charging indicator blinks .also i have flashed the bios .where can the problem be.
thanks

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repairs of laptops and selling of components

I think that its may be north bridge... Tray to rehot with 250 gr. 5 min the crystal, if something change replace it. This is me opinion. Sorry my english.

the problem was with the kb3910sf c1 and B4 are almost same.the signal run_on was not coming out pin 168.now the problem is with the inverter the inv_blen signal from nvidia go6200 is absent going to u46 which is a 74lv08 5pin AND gate. the lid signal is okay.any ideas. what i can do for the inverter.

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repairs of laptops and selling of components