Hello!
I have a Toshiba A300D-18A with no led and no power.
First check, I noticed that 3.3V were missing @ bios chip.
Got the schematic for this board, and ended up near U15 where 3.3V go out of Vo2 of this IC. Mesured pin7 and 3.3V where there.
@ PAD7, I only get 0.28V where 3.3V should present.
V02 goes to L22, C365 ,C417,R270 and C418.
Some components arent labeled, so I mesured continuity and found some points that should be these components (marked on photo with voltages).
Mesured resistance between Pad7 to GND , 25,5 ohm.
Mesured some of these components in Diode mode and one read open, the other 0.918 , and the one marked in blue 0.03
How can I go from here without the labels and find out the culprit?
Or is it that C in blue?
Thanks for any help!
I have a Toshiba A300D-18A with no led and no power.
First check, I noticed that 3.3V were missing @ bios chip.
Got the schematic for this board, and ended up near U15 where 3.3V go out of Vo2 of this IC. Mesured pin7 and 3.3V where there.
@ PAD7, I only get 0.28V where 3.3V should present.
V02 goes to L22, C365 ,C417,R270 and C418.
Some components arent labeled, so I mesured continuity and found some points that should be these components (marked on photo with voltages).
Mesured resistance between Pad7 to GND , 25,5 ohm.
Mesured some of these components in Diode mode and one read open, the other 0.918 , and the one marked in blue 0.03
How can I go from here without the labels and find out the culprit?
Or is it that C in blue?
Thanks for any help!
Comment