The laptop turns on for a split second, clicks, and shuts down instantly.
| Symptom | Likely Cause | Boardview Search | |---------|--------------|------------------| | No power, no LED | BQ24737 (PU200) dead or PQ201/PQ202 short | Search PU200 , PQ201 | | 3V/5V missing | PU401 (SY8288CRAC) failed | Search PU401 , check +3VALW , +5VALW | | CPU Vcore absent | VR_ON missing or PU1001 failed | Search VR_ON , PU1001 | | Fan spins but no display | BIOS corruption or PCH issue | Search UH1 (BIOS), PCH | | No battery charging | BQ24737 (PU200) or PR204 (sense resistor) | Search PU200 , PR204 , BATT+ | | USB / Audio dead | +1.8VS rail missing | Search +1.8VS , U33 (USB power switch) | | Short to ground | Capacitor short on B+ or +3VALW | Use boardview to locate all B+ capacitors | la-7912p rev 1.0 boardview