toshiba satellite l50-b-1n8 driving me nuts

[layad]

hi guys , i would like to get the schematic fot toshiba l50-b-1n8 (da0blimb6f0), i could not diagnose the protiction circuit on the second mosfet, as u see on the photos , the first mosfet has 5v on its gate which make the mosfet function and produce 18v on the other side of it but the second mosfet has 18v!!!! on the gate which is not normal, i thought the gate is shorted with the legs internally but its not!! anyone have the schemtic? or help me to find the problem!!!
thanks in advance

[piernov]

Re: toshiba satellite l50-b-1n8 driving me nuts

Schematics not available AFAIK. Some circuits are the same on Quanta BLBD (schematics available) but component label will be different, it can still help you.
PQ15 is for battery power, PQ16 is for AC power. The behaviour here is perfectly normal. Check on a buck controller MOSFET (CPU VCore for ex.), you should have 18V on one side of one of them.
I guess you have a no power issue, you must find 3V/5V now.

[layad]

Re: toshiba satellite l50-b-1n8 driving me nuts

Schematics not available AFAIK. Some circuits are the same on Quanta BLBD (schematics available) but component label will be different, it can still help you.
PQ15 is for battery power, PQ16 is for AC power. The behaviour here is perfectly normal. Check on a buck controller MOSFET (CPU VCore for ex.), you should have 18V on one side of one of them.
I guess you have a no power issue, you must find 3V/5V now.

thank you, yeah thats right ,its no power issue, tried to download Quanta BLBD schematics but its not the same ( hope u have one ) , im not that good in finding the problem without schematics , for example (buck controller) or trace 3v/5v

[ktmmotocross]

Re: toshiba satellite l50-b-1n8 driving me nuts

u dont need voltage on base of first mosfet because its internal diode pass the voltage through it. u must have low voltage on base of second mosfet from charger ic because it is P channel mosfet. so chceck charger is and compare it to datasheet

offcourse u dont have 3V/5V because almost every voltage is driven from 10V vin from second mosfet

[piernov]

Re: toshiba satellite l50-b-1n8 driving me nuts

Can you take high resolution pictures of both sides of the board? (take different shots for different part of the board if the quality is not high enough for the whole board)