Toshiba Satellite C660 Not Power On

[dimah77]

I Have Toshiba Satellite C660 with no power, on pressing power button, led is on for 5-6 seconds and turn off , after repeating power on many times, sometimes it turn on and work perfectly.
- Bios was flashed with Clean ME.
- RAM changed.
- Flashed with official website BIOS under windows.
Still same result, any help ?

[caspian]

Re: Toshiba Satellite C660 Not Power On

does the fan spin when the laptop does not have any display?

[dimah77]

Re: Toshiba Satellite C660 Not Power On

does the fan spin when the laptop does not have any display?

No, when no display, fan still off

[caspian]

Re: Toshiba Satellite C660 Not Power On

when it has no display, measure voltage at the two Mosfets which are located near the DC jack.

[dimah77]

Re: Toshiba Satellite C660 Not Power On

when it has no display, measure voltage at the two Mosfets which are located near the DC jack.

19v on PQ7 and PQ8, motherboard LA-6842P rev 1.0

[caspian]

Re: Toshiba Satellite C660 Not Power On

now check whether 3.3v and 5v are present or not.

[mcplslg123]

Re: Toshiba Satellite C660 Not Power On

I think VS line fault. When it switches off and fan not spinning, you are perhaps not getting 5v VS. Check mosfet for 5V VS. On pin5-8 you should get 5V ALW(even when not switched on) and on PIN 1-3 you should get 5V after switching. Pin4 Is gate where you will get around 12-18v.

[dimah77]

Re: Toshiba Satellite C660 Not Power On

I think VS line fault. When it switches off and fan not spinning, you are perhaps not getting 5v VS. Check mosfet for 5V VS. On pin5-8 you should get 5V ALW(even when not switched on) and on PIN 1-3 you should get 5V after switching. Pin4 Is gate where you will get around 12-18v.

+3valw and +5valw ok but No voltage on gate pin4 for mosfet Q30 (+5valw to +5vs)

[dimah77]

Re: Toshiba Satellite C660 Not Power On

If it can help :

[piernov]

Re: Toshiba Satellite C660 Not Power On

Sounds like SLP_S4# not coming up.
Will most likely not be your issue but last time I had an intermittent issue like this was due to a break in RTCRST# line. Pull up resistor is next to the PCH so that was ok (always 3.3V), but the cap to ground was pretty far away, next to the Clear CMOS pads near the RAM slots, and there was no continuity to there.

[mcplslg123]

Re: Toshiba Satellite C660 Not Power On

If it can help :

Are you getting 5V vs on pin 1-2-3????? You didnt gave feedback on it. You only mentioned gate(pin4)

[dimah77]

Re: Toshiba Satellite C660 Not Power On

Are you getting 5V vs on pin 1-2-3????? You didnt gave feedback on it. You only mentioned gate(pin4)

sorry, no voltage on gate and no voltage on source

[tracker1]

Re: Toshiba Satellite C660 Not Power On

Had the same problem, replaced q11a and fix the problem