Toshiba L455D - Powers On Then Off
Toshiba L455D Blink On then Off Light. Power light functions normally. Charge light functions normally. Does not run. Does not post. Turns on then shuts off. The unit powers on then after a few seconds- shuts off. This is was caused by a shorted MOSFET PQ10 that exhibited a full short 0Ω Since they were in a pair formation, both were replaced so the current level would be balanced. The cost is so low, that it was not a consideration. Two AO4466 replaced with two AO4468 mosfets which were available. AO4468 is out of production, but were found on an HP DV6000 near the Maxim [MAX8734/PU10] quad output power distribution chip. (PQ31/PQ32 on DV6k) The coil PL3 was cracked in half, was not exactly sure if the coil would be defective, but the nature of coils is to push current within the electromagnetic field, so if the field is open the electrons may not go forward, tools did not allow the ability to verify. So it was replaced....