Question about Toshiba (K000002020) Motherboard
I have a Model M40X, that only turns on power light after switching on, then starts the fan for 4 seconds, HD and DVD lights just flash once, then nothing, no boot screen, just the power light. 1 out of 25 attempts will initiate a boot start, but when the laptop is moved, the screen turns black again and no apparent action is visible, except the power indicator.
I had this problem 2 years ago, 3 days after purchasing. When it was returned 2 weeks later, I phone the Toshiba service centre to ask what had happened. They said they replaced the motherboard. Quite a strange thing to do with a brand new laptop. Anyway it worked OK for about 2 years.
After it failed a couple of days ago, I spent a few hours to disassemble it completely. I found some helfull notes about the power socket and noticed on my MB that apparently it already was modified in a similar way. It had big shiny solder balls with some brown flux on all connections, apparently not lead-free. In addition, the socket was surrounded with some yellowish potting stuff, perhaps epoxy.
I guess that this can't be the problem, since it has the same problem with battery w/o adapter, battery with adapter, and adapter only.
Perhaps the board is cracked near the power socket since I frequently use an adapter at home that I purchased extra from Toshiba. It came with an extra adapter (to adapt from one size smaller to the proper size), making it very long, which causes more strain on the MB. Are there any more tips and tricks that might help me to solve it? I read something about a 40 pin chip near the socket that might have bad joints as well, but I can't find one very close to it. The PL1 part near it seems to be soldered just fine.
I was also wondering why cracks near the power socket may cause my problem when I do not use the adapter and my battery is full? I tried booting with other memory, without DVD, HD, even without modem and WiFi, all with the same symptoms.
Does any of you guys know another cause, chips to be soldered?
It is most likely a crack in the chip that sends power to the CPU. Fan is on different circuit and is getting power. Almost need a really strong maginifying glass to see a crack like that. Unfortunatly the best solution is a new motherboard. I have had some sucess with resoldering these chips but you need a hot air rework station to do a real repair. Hardest part is figuring out which chip it is. A lot of them are labeled MAXWIN ****. Should be fairly close to the CPU socket. Hope this helps, keep us posted. One other thing to try is pushing down on the laptop in the area of the cpu when you boot it and see if that helps. Opening and closing the laptop screen puts a lot of stress on the motherboard and over time will crack the cold solder joints.
Posted on Jan 11, 2008
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Posted on Jan 02, 2017
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