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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Jun 07, 2012 | Motherboards
When you plug in the power cord is there any lights
whatsoever on the laptop, where the plug goes in or on the AC Adapter of the
When you press the power button do you hear fans running, hard drive spinning, lights on the computer, hear any beeps or lights constantly blinking, hear the DvD/CD drive click and the light on the drawer of the DvD/CD turn on for a second or two? If so the laptop is trying to boot or may have booted, but the screen is not showing for some reason.
Beep tones and blinking lights tells the technicians what is going on with the laptop and why it is not booting. Most times it's a motherboard issue when you hear beeps or blinking lights continuous. Most times the problem is with the memory or Video Card. Count the Blinking Lights or Beeps and take note of their pattern (1 Long or 1 Long followed by 2 Short).
Maybe your power cord is bad if you don't get anything to happen whatsoever when you press the power button. And if that's true maybe you was operating off the battery the last time you had it on and since the power cord is bad, it was not charging the battery so the battery is drained and the power cord is bad.
Maybe you have a Static Charge Buildup. Remove the Power Cord, Remove the Battery, then Press and Hold the power button for 30 seconds. After 30 seconds plug the power cord back in (leave the battery out) and hit the power button to see if it boots. If it does, you can put the battery back in and let it charge.
Maybe your DC Power Jack which is where the power cord plugs
into the computer is bad. Take an ink pen and push the tip inside the
jack and see if the little pin wiggles, if so the jack is bad. You'll have to
take the laptop apart to fix it. Most times it is soldered onto the
motherboard, so you will have to desolder the old and solder a new one.
Maybe your memory is bad or the memory slot is bad.
Remove the Power Cord, Open the Case and remove one of the
memory chips. Set the chip aside then try rebooting the computer.
If it boots, then you know the memory chip you set aside is bad so mark an x on
it with an ink pen. If it fails to boot then move the chip to the next
memory slot and try rebooting. If it fails take the chip out and set it
aside, then put the other chip in and try booting it in both slots. If it
boots, just to verify that the chip set aside is bad, mark an x on it and put
it into the open memory chip slot and try booting.
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CHANGE THE POWER SUPPLAY.. BUT FIRTH..
1-UNPLUG HD AND TEST WITH FLOPPY OR CD BOOT DISK
2-UNPLUG YOUR MEDIA ROOM LIKE CD OR DVD AND TEST ONLY WITH FLOPPY BOOT DISK
3-UNPLUG VIDEO CARD AND ALL CARD ON YOUR MOTHERBOARD.. TEST ONLY WITH THE FLOPPY DISK AND ONBOARD VGA.. OR GOOD TESTED VGA CARD.
EXCUSE MY BAD ENGLISH.
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