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Dell Inspiron 1520 Laptop Motherboard Repair.

\015 I have a Dell Inspiron 1520 Laptop that will not turn on.\015\012\015\012Problem description:\015\012\015\012Laptop will not power on (no POST, no beeps, no display, no activity.\015\012\015\012When the power button is pressed, the power LED turns on for a few seconds and then turns off. The CPU fan does not make any attempt to spin. The HDD does not spin up.\015\012\015\012The laptop is dismantled to a minimal setup - No display, no keyboard, no modem, no wi-fi card, no HDD, no optical drive, no ram, etc. The video is integrated, therefore non-removable.\015\012\015\012Only the power adapter, motherboard, CPU, fan, and power button assembly are connected (presumably the absolute minimum to get the laptop to do something).\015\012\015\012The fan is good, and a CPU swap yields the same result so I assume the CPU is good too. The HDD is good, and works when plugged into my desktop machine.\015\012\015\012The adapter and battery are also both good. The adapter charges the battery just fine. The charging indicator LED remains on until the battery is charged and then turns off. The charge circuit seems ok.\015\012\015\012There are measureable voltages at various places on the motherboard, but I am going into this blind and do not know what to look for.\015\012\015\012When the power button is pressed, a measurement at the SATA power connector for the HDD indicates that I have 5-6V on the appropriate pins, but I do not seem to have any voltage on the 12V pins.\015\012\015\012Also, I don't seem to have any voltage on the 5V pin of the fan connector.\015\012\015\012I think the fan gets its voltage from a fan-controller IC, but cannot locate any information on the chip.\015\012\015\012I am interested to troubleshoot at the component level. I am not interested in replies such as ''you should take it to a shop'' or ''replace your motherboard''.\015\012\015\012I have basic troubleshooting skills and a DMM, but do not have an oscilloscope. \015\012\015\012Please help me isolate the problem. \015\012\015\012Thanks.\015

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