Toshiba c660 need help please

[soundstorm]

i have toshiba c660
pwwha la-7201p
rev:1.0 2011-02-21
core i 5 with nevida chip
have problem he is power on but no display and with dc power supply seems it work it have 1.49 amp but no caps lock light or display just power
i have problem with his flat cut and no power only
all volts good bios good u22 have 3.3v but u13 have short in pin 3,4,7and8
see aprblem with +3vs and +3valw short try to catch bad lines but nothing all parts good i don't know its vga or pch
can any one help please and if i can do uma enable i don't now how
and this my schematic

[mielta]

Re: Toshiba c660 need help please

Hi
Look at page 41 +3valw to +3vs messure on q29
is +valw ok or not ?

[soundstorm]

Re: Toshiba c660 need help please

thanks
on q29 D And S short when i remove q29 D only short+3valw
+3valw not ok what can i do

[JaroTech]

Re: Toshiba c660 need help please

Hi, what voltages do you have on both sides of PL332 and PL352?

[mielta]

Re: Toshiba c660 need help please

you must injected voltage to +3valw with an psu bench and witch komponent
are hot

[soundstorm]

Re: Toshiba c660 need help please

you must injected voltage to +3valw with an psu bench and witch komponent
are hot

don't under stand how and what psu u mean dc power supply nothing r hot expect chips and cpu
voltage on pl332 3.3v and pl352 5v
have short on q29 on pin 1.2and3 and bios chip pin 3.4.7.8

[JaroTech]

Re: Toshiba c660 need help please

What voltage do you have on the gate of Q29 pin 4, when you have zero volts on an output, does not mean that you have a short circuit to ground.

[soundstorm]

Re: Toshiba c660 need help please

thanks for feedback
on q29 pin 4 about 15.9v pin 1,2 and 3 short to ground only when not power when power have 3.3v
i have same board don't have any short in q29 or bios chip the problem was in lcd flat cutting and found this problems board power with no problem and with dc power supply it takes about 1.5 amp and 19v but hanged no caps lock no data i can't find the problem and only i have with +3valw short with ground

[Hsseinyassein]

Re: Toshiba c660 need help please

Hello,
can you help me
i need way dis to uma for
tishipa 660-a261
pwwha la7201p
rev 1.0

[Sametbey]

Re: Toshiba c660 need help please

When you examine the scheme, you can see that UMA is not possible. good works.