Question about Toshiba Satellite A15-S157 Notebook

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Shut-Down Hi guys, well I tried replacing the heat sink, and the cooling tube and fan seeming to be good...I finally took the computer apart and looked at the motherboard and capacitors and all looked ok...It looks like I might have to replace the motherboard...in which is around $500+.Well if anyone has any other suggestions to try out Please let me know...to those who gave me there solutions to try...I really appreciate the help...Thanks, Michael

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  • Michael Gallegos
    Michael Gallegos Jan 21, 2008

    Thanks for the help. Unfortunetly I'm not too experienced in the electronic department..I did remove the board and looked at it and didn't seem to find any abnormal colors or leakage..I really can't afford to replace the board at this time...Your help was a great help and once again thanks...Michael

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Thermal runway occurs when a semiconductor component heats up thereby allowing more current to flow through it, leading to even more heat, which quickly builts up. It seems that the best place to focus your attention is the switched mode power supply unit (the power switch tends to be right on it), since it is there that current limiters and over-voltage protection circuits will be found. Clearly, these protective measures are kicking in when a fault is detected. Check for any surface mounted transistors on this module that are getting unduly hot; sometimes even a largish electrolytic capacitor will cause such a power fault, since they tend to dry out with age and heavy usage. If you can get your hands on a similar module try swapping it in. If not, then try replacing the SMPS board components that are heating up. Experience in electronics definitely needed.

Posted on Jan 18, 2008

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