Sony Vaio MBX-224 with +5valw and +3valw voltage drop

[abuhamza]

Hi guys,

I have a sony vaio mainboard with this symptoms; when i plugged in the charger, the +5valw and +3valw have normal voltages, 5v and 3.3v.

But when I press the power button, the 3.3v drops to about 1.4v, and the 5v drops to around 0.1v, and in the dc power supply shows 0.13 amps.

Any help would be appreciated.

[mielta]

Re: Sony Vaio MBX-224 with +5valw and +3valw voltage drop

Hi
This means you have a shortcircuit on the board.
you must messure with multimeter on ohm in which circuit
i think it is the 5v line

[mielta]

Re: Sony Vaio MBX-224 with +5valw and +3valw voltage drop

messure PL16 and PL17 to ground howmany ohms

[abuhamza]

Re: Sony Vaio MBX-224 with +5valw and +3valw voltage drop

messure PL16 and PL17 to ground howmany ohms

Do you mean measure it in diode mode? or in ohm mode? i'm sorrry i am new in this things.

I measured both PL16 and PL17 in diode mode with red probe on ground, and black probe on the coil, the result is this :

PL16 = 240 ohm
PL17 = 240 ohm


But when i use ohm mode, with black probe on ground;

PL16 doesn't show fix number in the multimeter, it shows random resistance
PL17 = 2,7 k

[mielta]

Re: Sony Vaio MBX-224 with +5valw and +3valw voltage drop

Check pc105 and pc203