Hi, SONY MBX-165 MS92 Rev 1.1 not start and have this symptom:
Protection Circuit output (PR82) are very low Voltage.(~2V). And some noisy voice ( Dizzzzzzzzzzzzz) come from motherboard and I cant find what is it? I take off some Capacitor And Coil around CPU ZIF but nothing changes. I have strange guess that GPU causes of this symptoms.
Please Help.

Hey, nobody know? any similar experience?
---------- Добавлено спустя 1 минуту 32 секунды: ----------
I have 3 similar MB that has same symptom and not power on.

What are the measurements were made? TERMS OF LAUNCH Always start with the measurements if you want to help you.

Oh brother, No 19V passing, there in no 19v On +3VPCU and +5VPCU Mosfets, so there in nothing on the board. Big problem is this MB's Protection circuit is very complicated, son NO 19V voltage pass through it , And I don't know why?!!!
---------- Добавлено спустя 3 часа 10 минут 5 секунд: ----------
PQ64 & PQ65 are causes of this issue. When take them off 19V come back and noise gone, But when I replaced them by other ones ( take from other similar MB) symptom came back! PQ64 & 65 are from one type: IRF7904PBF. I don't have exact one, what FETs can Use instead of this?

Measure resistance on PL9 and PL8. Protection latch deactivates for session by reconnecting RTC battery.

PL9=1K[omega][/omega] , PL8=3K[omega][/omega].I clear CMOS and reconnect RTC Battery but situation is same.
---------- Добавлено спустя 5 минут 13 секунд: ----------
And I want to know where is these protection latches? would u explain? thanks.

Measure the resistance on all the PL.

PL17=0.9K[omega][/omega],PL10=0.6K[omega][/omega],PL11=25[omega][/omega],PL5=0.5(DIODE MODE),PL13,PL14=0.4(DIODE MODE),PL15=0.44(DIODE MODE). GPU chip-set Taken off the board.
Some resistance said in diode mode ( because in Ohm mode they has jump and down). what do u think?

u have short circuit. You need Labaratory Power Supply to define where it is.

I said there is diode mode actually, resistance is:

PL5=4.35M[omega][/omega],pl13,14=20k[omega][/omega],pl15=20k[omega][/omega]. I am sure there is no short circuit.
---------- Добавлено спустя 7 минут 50 секунд: ----------
Please Explain more about protection latches.

Another multimeter(workers) test mode Ohm's all PL.

PL17 = 0.9KΩ, PL10 = 0.6KΩ, PL11 = 25Ω,PL5 = 4.35MΩ, PL13, 14 = 20kΩ, pl15 = 20kΩ.
There is not short, But PL11=25[omega][/omega] ( food of N/B and low resistance is usual).

Please Help. Some Laptops tired me to death!

Hey, nobody knows? I am really in trouble. It happens after VGA reballing. M.B work fine( no display sometime bu switches on.) after I reballed this trouble happens.

I think, the VGA chip is shortcuted. After reball.

I take off VGA chip from M.B but symptom not changed.

There is a something in Max8732A datasheet: "3.3V SMPS Enable Input. The 3.3V SMPS is enabled if ON3 is greater than the SMPS on level and disabled if ON3 is less than the SMPS off level. If ON3 is connected to REF, the 3.3V SMPS starts after the 5V SMPS reaches regulation (delay start). Drive ON3 below the clear fault level to reset the fault latches"
clear fault level=0.8V
So if i want to reset the fault level I should pass 0.7V from ON3 pin by lab power supply?

Changed Power max. everything is OK. Case closed.