CPU upgrade A135-S4656
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peddleagain



Joined: 31 Aug 2010
Posts: 28

PostPosted: Thu Sep 16, 2010 7:18 pm    Post subject: Reply with quote

Bad news folks. I removed the old cpu and inserted this one. I cleaned it good and put new goop on it. when I got the thing back together the only thing I got when I pressed the power button was a blue light on the power indicator.
It supposed to be blue. I did not hear the HD spin at all. I took it apart and took out the t2450 and replaced the cpu with a different newer version of the stock cpu with the same result. I felt the fan run at start but nothing else. I have the mobo out again and am going to put the cpu I didn't like back into it. It is just possible that the newer matching cpu may not work. Two things I noticed;1. the cpu I didn't like looks very old. I suspect that is hwat too much heat does to a cpu but do not know. 2. The t2450 has its rectangle at 90 degrees to the OEM cpu when plugged into the machine.

Any Ideas? did I fry the mobo? how can I diagnose it if it doesn't run when I put the original cpu back in?
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peddleagain



Joined: 31 Aug 2010
Posts: 28

PostPosted: Thu Sep 16, 2010 7:49 pm    Post subject: Reply with quote

Got the original cpu back in with the same problem.

Now What? I've taken this thing apart many times so I don't think it was anything to do with my work. I suspect there may be something loose that I cannot see. Or the T2450 blew the mobo. It doesn't seem likely though. Maybe something is stopping power from getting past the cpu when it powers up? The monitor is black with no flutters of any kind.

HELP!
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gshv



Joined: 01 Feb 2003
Posts: 7898
Location: Fairfax, VA USA

PostPosted: Thu Sep 16, 2010 7:59 pm    Post subject: Reply with quote

Try to put the new CPU in, and clear CMOS before you start the system. To clear CMOS look for 3-pin jumper near CMOS battery on the motherboard. If you find it then disconnect the power cord, and move the jumper into different position, i.e. if it connects pins 1 and 2 then move it so it connects pins 2 and 3. Wait for 30 seconds, and put the jumper back. If you can't find the jumper then remove the CMOS battery, wait a little bit, and put the battery back. If the new processor doesn't work after that then try to reset CMOS before putting your old processor back.

Gennadiy
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peddleagain



Joined: 31 Aug 2010
Posts: 28

PostPosted: Thu Sep 16, 2010 8:22 pm    Post subject: Reply with quote

Thanks!
OK noiw the embarrrassing part.
I finished putting it back together after the last try and noticed I didn't have the RAM in. DOH. anyway it started up with the original to the mobo cpu.
I did have the RAM in when I tried the t2450 and the newer cpu. In fact I had put it all the way back together and had a black screen and only the fan and blue light.
BTW I remove all power before opening the machine and do not hook it back up until the top and keypad is back on.
Ummm as for pins and such this laptop doesn't have anything remotely looking like pins or anything I have found diagrams of online. So resetting cmos on this thing is beyond me at this point since the battery is soldered in. I even tried to unsolder the battery on my broken mobo and had no luck!
I'm pretty sure this is intentional on Toshiba's part. They can reset cmos at their depot so it must be done with some sort of tool or keystrokes on start but I don't know what it is and can't find it online. Surprising really you'd think a Toshiba employee would have given this knowledge up by now.
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peddleagain



Joined: 31 Aug 2010
Posts: 28

PostPosted: Fri Sep 17, 2010 9:32 am    Post subject: Reply with quote

I've read more online about the CMOS and well I don't see much different than I did before I sent it into toshiba after I put the new mobo in, but I did learn this; the machine when it booted up yesterday after I put the old cpu back in had the cmos reset. I was given the choise of f1 or f2. I started normally and had to set the time and date. It was the reading about cmos reset later that told me this is the sign the cmos was reset but I still had my password so I'm a bit pissed that I couldn't get help on some techie sites with this issue and was forced to send the machine into toshiba, because cmos allegedly resets the password.
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