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  Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe) 
 
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William James Jun 23, 2004, 07:39pm EDT Reply - Quote - Report Abuse
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I thought it was worth starting a distinct topic just for us Z600 and Z505 users! Can
F-series shutdowns and GRX memory slot victims stay clear, please? However, if
TomP and/or JoeK can help, we would be grateful.

We are suffering the "won't power up for a week or so" problem. Several complaints
in this forum and elsewhere all with identical symptoms:

. Laptop runs perfectly when it runs ...
. After shutdown, there is a good chance that power-up will flash the power light briefly
and nothing more. Probably several days or weeks before normal service resumes.
. Power supplies/batteries/CMOS batteries all check out OK.

See Brad's message in http://www.hardwareanalysis.com/content/topic/5449/?o=300
as an example - my symptoms are identical.

I've done a bit more investigation of the symptom. With the CMOS battery in place, you
can only flash once. With it removed, cycling the external power allows you to observe
the lone flash again. Seems to make little difference whether the main battery is in place
or not. We also have a suspicion that the battery does not charge when the unit is in this
state.

Any ideas on how to restore these lovely little machines to health?

William


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Joe K Jun 23, 2004, 11:52pm EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
William,

The Z505 series had a couple different motherboards used. Is there a specific Z505XXX model or is it widespread across the whole series.. (which I would find hard to believe.)

So, to start I think we need to find out what models are being affected exactly. Personally, I haven't had this issue brought to my attention to diagnose (board sent in for research). If it's a common problem, it might be worth looking into.

Once again, several boards were used by Sony for the various Z505's with the different Soldered CPU speeds.


Joe Kabalan
AQS Computer Services
2572 Sheridan Drive
Tonawanda, NY 14150

Toll Free: 1-866-204-4677
Local: 716-832-2473
Email: aqs12@adelphia.net

http://www.aqstech.com
http://www.laptopbios.com

Joe Kabalan
http://www.AQSTech.com
Laptop / Notebook BIOS Repair
Motherboard Defect Solutions
William James Jun 24, 2004, 08:46am EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
Brad's is PCG-Z505JE, mine is a PCG-Z600LEK. I'll look up some more...

William

William James Jun 24, 2004, 10:36am EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
... and two instances of Z505HS ...

William

Paul Garcia Jun 28, 2004, 05:16pm EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
Strange, my PCG-Z505LSK just suffered from the same power failure as the rest.

Wendell Wilson Jul 09, 2004, 06:40pm EDT Reply - Quote - Report Abuse
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Edited: Jul 09, 2004, 07:06pm EDT

 
>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
I'm having the same issue from a Z505LS. I have a logic analyzer and oscilloscope handy. I -thought- it was a problem on the switch/modem board.. something not asserting a line long enough, or something similar. I can't get it to behave anything other than totally randomly.. all I know is it is getting worse. And it is much less likely to turn on with a battery than without. I have tried both a brand new main battery as well as the original (which still lasts about 15 minutes). Also, cmos voltage is 3.04v, even under a 5mA load.

My guess is that it is some component that wears... electrolytic capacitors? Don't think so. I don't have a good in-circuit ESR meter I can use, though. Regulators? Maybe, though I can't see any heat discoloration around any of the ones on the top side of the board. Insulation breakdown on the coils? Maybe..

Anyone have a service manual or schematic???! Even a parts list. This has to be something stupid.. I can't believe this is happening. This laptop has been very carefully cared for... and was so very expensive.

thoughts??
Wendell

JLC JLC Aug 12, 2004, 09:30am EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
Hi all.

I have a PCG-505 DL that I bought in the US 2years or something a go. I have the problem of the laptop shutting down randomly for at least one years (sometime having the killing blue screen). So I recently changed the HD as each time it was shutting down I was earring a little spring sound. I did work for few days, and shut down again, with not reason. So U put a other HD, but still not start up. I read something about batteries problem, having to unplug the cmos batteries. Still not working. Thinking the MB was dead I found this forum on google, and still reading the treads. But yesterday night I opened the laptop to see the memories, so I took out the keyboard, and found out that there is just one 128mb memory the other one is on the MB. So I took out the memories and was able to boot, download emails and everything (slowly, but surely). I said I'll give a test, I reinstalled the memory back, try to boot, nothing... So I took gain the memory out thinking that 128mb would be OK for now, and I'll buy 512 or something later. Unfortunately even without the memory it doesn't boot anymore L. What can I do? Does somebody's having problem with this kind of laptop?

Thanks for your help.
JLC


Ivor Hewitt Aug 24, 2004, 04:43am EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
Just wanted to report the same problem on a UK Z600-TEK.
After prolonged use the machine shuts down instantly (no hibernate) and will not power back up.
Removing the battery and power cable, then reconnecting will enable power up depending on how long the machine has been disconnected for. If reconnected immediately then the machine will power off within seconds.
If left for several days then normal use seems to return.

I found a tip somewhere, but now googling again I can't find it, that suggested leaving the power cable and battery off and holding in the power button for a few minutes.
This did seem to enable to machine to run for longer before powering off again. Something discharging perhaps? (or just a coincidence)

Has anyone got any more 'scientific' analysis of these problems.

Michael Stone Aug 25, 2004, 01:56pm EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
I just got a Z505JE from ebay. Maybe it was the Brad's, the seller name is brad. :-)

Exactly the same problem, laptop could boot up and works perfectly. after shutdown, it might never reboot again.

I found a work around on this laptop, I open the keypad , disconnect bios battery, harddisk, then power up, the power lights up. Turn it off. reconnect the harddisk, bios battery, power up again, notebook could start up and everything works fine.

I tried this several times, it could always bring the laptop up.

But, I still don't know how to fix this permanently, the harddisk is not an easy access part.

Ivor Hewitt Aug 25, 2004, 02:40pm EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
I guess that solution is causing some sort of discharging to occur. The worry is that the problem re-occurs again and again. Very annoying when you keep corrupting your disk and losing work. It would be good to find out what component is causing this behaviour and fixing it.
Anyone have any ideas to try and track this down?

Ivor Hewitt Aug 26, 2004, 04:07am EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
By the way... did you try the remove AC adapter and battery and hold down power button for several minutes idea? Curious if that works for you. Certainly easier access than the harddisk. :-)

William James Aug 26, 2004, 04:13am EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
Just reviewing the contributions here. I think JLC is in the wrong place - not
a Z505 - looks similar symptoms to those fixed by the thermal sensor and
capacitor replacement elsewhere?

Ivor is unique - the first Z machine to report abrupt shutdown as the first
sign of trouble. I'm pretty certain that everyone else has NO problems
with their machine other than persuading it to start!

I'm going to get mine out of the drawer again tonight. I would like to try
the two new recovery suggestions above.

William

JLC JLC Aug 30, 2004, 07:09am EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
>>Just reviewing the contributions here. I think JLC is in the wrong place - not
>>a Z505 - looks similar symptoms to those fixed by the thermal sensor and
>>capacitor replacement elsewhere?

Thanks.
I tried to find it but I couldn't. Would you please give me more info about this?

Thanks a lot.
JLC

Michael Stone Sep 08, 2004, 07:51pm EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
Z505JE

Just let the notebook sit for about 7 days, it could boot up. The bios information was lost. After reset it, the laptop could start up and works perfectly.

It has been 4 days since the recovery, Just not sure how long this could last ..

Wei Wei Sep 15, 2004, 09:03pm EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
My laptop is Z505VA, it encountered the same annoying problem as you describled.
I sent the machine to a lot of places for repairing, the answers were almost the same: change motherboard with crazy price.
Now I decided to repair by myself. I have successfully repaired hundreds of TVs and other electronic devices but very few computer related equipment. Now I purchased some tools from ebay: a digital multermeter and a hot-wind solder station are on the way.
If I handle the problem Then I will tell everyone what I would have done. And I would think of starting my business into computer hardware repairing.
If I killed my machine then I would never feel regret, as the annoying problem is driving me mad.

Joe K Sep 20, 2004, 05:53pm EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
Hello Everyone,

I have a Z505LS that we repaired about a month ago that the customer responded is "dead" again. (This is exactly what I try to avoid and the main reason we will not take these 505's in for repair currently)

Well this Z505LS is back here and lucky for everyone, it's doing the hit the power button and power light for a second and then back out thing.

This is good.

I think we may be on to something, and now that I'm looking at the board this series came out right around the time the FX series was starting to be released. We are very knowledgeable with the FX (Intel based) boards and it turns out these Z505LS (and like) series share mostly the same components.

Now that we have the Z505LS up and running it's going to be a waiting game, but I have a good feeeling about this, otherwise I wouldn't have posted.

Please don't ask for specifics on the problem, it is component failure within the power management circuit.

I'll keep you all posted.

Thank you,


Joe Kabalan
AQS Computer Services
2572 Sheridan Drive
Tonawanda, NY 14150

Toll Free: 1-866-204-4677
Local: 716-832-2473
Email: aqs12@adelphia.net

http://www.aqstech.com
http://www.laptopbios.com

Joe Kabalan
http://www.AQSTech.com
Laptop / Notebook BIOS Repair
Motherboard Defect Solutions
Wei Wei Oct 03, 2004, 08:59am EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
It seems that I saved my Z505 by disabling the self protection of power supply circuit. My laptop worked for about 1 month without the mentioned annoying problem again.
Warning! If you are not familar with electronic device repairing or if you do not have proper equipment, please don't do this by yourself. And one should take his own risk to follow my method to disable the motherboard's protection function.
Check the motherboard on the back side, there's a small chip near the memory slot labeled "LT1628". Just find the pin No. 6, you can find a capacitor and a diod connected to this pin. Remove that diod with a hot-wind solder. Now assemble you laptop and test your luck.

Michael Stone Oct 04, 2004, 01:39am EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
Hi Wei wei,

I tried your method and take out the diode, but the problem remains.

Here is what I found for the chip LTC1628. Take a look at function for PIN 6 , the "Standby Mode Pin" in page 11. It looks like if we leave this pin open, "allowing the turn-on of either controller
and activating necessary common internal biasing."

http://www.linear.com/pdf/1628fb.pdf

Anybody could confirm this ?


Mike Nuthall Oct 04, 2004, 04:52am EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
I had exactly the same problem.

I took my UK model (a TEK) into Sony in New Zealand and eventually they came back saying this issue came from a faulty CMOS charging ciruit on the motherboard and that the only solution was to replace the Motherboard which in New Zealand and the UK is nearly more expensive than replacing the whole computer.

As a short term fix you can take the battery off the computer, pull out the connection to the CMOS battery on the motherboard and the computer will turn on but this stopped working for me after about a month. They did confirm that they had had a lot of the same issue with that motherboard.

If anyone knows of a reasonably priced motherboard or knows someone who can fix the ciruit I would be grateful.

Regards

Mike

Wei Wei Oct 04, 2004, 09:28am EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
Sorry for my incomplete information.
My Z505's battery was already dead, in fact I use it only with the AC adapter.
After my Z505 got won't start problem, I did a lot of checking and operation on the motherboard.
There is a MOSFET chip near the power supply socket labeled IRF7313, it worked as a power switch. When the computer stopped work, the 19.5V disappear from pin 1 and pin 6. So I have already shorted pin 1 to pin 8 (for main power supply) and pin 3 to pin 6 (for battery charging circuit). But the computer still didn't work until I remove the diod from LTC1628 (mentioned in my previous post). Now it worked perfectly!
I don't know if it would work with the battery.

My method is not repairing. My crazy way is just let the computer run, and it works, it's just better than nothing!

Ivor Hewitt Oct 04, 2004, 09:59am EDT Reply - Quote - Report Abuse
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>> Re: Sony Vaio PCG-Z600/505 won't power up (one for Tom and Joe)
Hmm, is it possible that this is the component that has "gone bad"?


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