My Sony Vaio Which I purchased 2 Yrs ago was working fine and it just suddenly shutdown approx. 1 year ago. I put it into a local Repair shop for repair. After there diagnosis they determined that it was the pentium 4 proc or the MB that was defective. I have electronics servicing in my background ( Associates degree In Electronics Engineering Technology 1976). I was reluctant to take a look at this machine because my background is in Audio/video technology, afraid of the laptop concept. Upon my removal of switch panel and keyboard I observed that the fan plug had been subjected to excess heat at its plug to MB, and was ruptured and intermittent. I cut the plug from unit and installed new plug. That restored fan operation but sometimes the fan would fail to start. I bought new processor didnt fix it. I put puter under table and left it there for 5 months then oneday i plugged it up hit the powerswt and it booted out of the blue, I loaded XPPro SP 2&3. System was on for 2 days i was afraid to shut it down except for the restrt. then it shut down again and wouldnt restrt. I went back inside of it and found that there appears to be a short somewhere around the powerswitch. I can make it boot by applying pressure near the switch area. It will start and run for a startup then shutdown again. Please help, This puter is still just like new and i just love it, paid $2600.00 when new. Also got a 4 yr student son in college majoring in mass communications, yepp a journalist with broken Dell Lat. D600 thats needs a puter like yesterday. Is this a problem anyone has seen HELP
Wow, seems like you've diagnosed it already. Either it's a bad board trace or a bad connection in the switch control. It sounds like you put it back together before you started pressing on it. I'd try starting with repair4laptop. Though they don't have a specific set of instructions for that laptop, they have a few close. I'd try bypassing the switch by finding what two connections on the mainboard the switch operates (going downstream from the switch, which two connections are completed when the switch is pushed. Try jumping these to see if it always starts the laptop. If it does, than you might be able to swap out the switch or solder on an alternative switch with parts from radioshack.
Repairing a trace isn't that easy (as you probably know). they are covered with epoxy resin and you'll have to scrape this off, but if you can follow it back to an easy to solder union or joint, maybe you could attach a few small wires that will allow you to bypass the damaged area.
or, replace the motherboard entirely for $200
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your system. Your reset is now complete
step for those of you having POST issues or no POSTing at all. Like
other troubleshooting steps, this will not always work but usually will
depending on the problem.
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Thank You very much Humble. I am an old school Electronics Tech now driving a 18 Wheeler till retirement. I am somewhat reluctant to attempt service work in a laptop. Im not as fimiliar with the block diagram and sequence theory of operation in puter. I have another Sony vaio switch panel with a cpl of the smal micro switches on it. I thought abt desoldering one of them and simply subbing it in but i first wanted to see if it might just be a factory defect from manufacturing that maybe someone had seen B4.I will change switch very soon and let ya know what i come up with. It really is just elementary electronics servicing dont know why I didnt just trace out that swt and bypass it. It is the only way to service any switch, LOL. Just a little leary about laptop servicing, even tho it is all the same. Thanks Agian Ronald
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