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Old 01-09-2014, 05:28 PM   #41
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Default Re: Toshiba L650 power problem

on Q6004 pin 3 i have 19V, pin 1 and 2 0. I think there is leakage on Q6002 between gate and drain or gate and source.
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Old 01-09-2014, 05:38 PM   #42
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Default Re: Toshiba L650 power problem

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i can suspect at Q6002 i have 19V on Drain and Source, but on Gate i have that wild voltage (2,7,10,3...etc), cn i bridge 19V to Gate?
The state of the fault has changed now. If the Gate is 19v now, it means Gate to Source short or U6000 is not trying to turn on Q6002 and Q6005.
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Old 01-09-2014, 05:41 PM   #43
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Default Re: Toshiba L650 power problem

What are D, S and G voltages of Q6002 now?
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Old 01-09-2014, 05:46 PM   #44
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Default Re: Toshiba L650 power problem

i take Q6002 from board, and they are all shorted all 8 of pin
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Old 01-09-2014, 05:50 PM   #45
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Default Re: Toshiba L650 power problem

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i take Q6002 from board, and they are all shorted all 8 of pin
Its possible there is still another fault causing reduced drive voltage to Q6002. This will cause it to overheat and go short. After it is replaced, measure the G to S voltage for a long time to be certain it is stable.
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Old 01-09-2014, 05:53 PM   #46
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Default Re: Toshiba L650 power problem

you mean it could be the fault of U6000 max ic? How mutch long time? When i measure G to S, what volteges will i have?
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Old 01-09-2014, 06:16 PM   #47
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Default Re: Toshiba L650 power problem

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you mean it could be the fault of U6000 max ic? How mutch long time? When i measure G to S, what volteges will i have?
The last time I measured, I think is was about 7v. The data sheet for U6000 might say.
I would not blame U6000 directly. I would check the boost voltage on pin 7 if the G to S voltage on Q6002 is too low or fluctuates.
Or there could be still be leakage in other components between G and S or G to ground.
I would test run it for a few hours today and tomorrow.
Its difficult to say when a dormant fault will return.

Last edited by rievax_60; 01-09-2014 at 06:18 PM..
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Old 01-09-2014, 06:57 PM   #48
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Default Re: Toshiba L650 power problem

i plug in adapter and measured pads where Q6002 was. Between G and S voltages fluctuates between 18V - 21V
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Old 01-09-2014, 07:26 PM   #49
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Default Re: Toshiba L650 power problem

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i plug in adapter and measured pads where Q6002 was. Between G and S voltages fluctuates between 18V - 21V
I cant make much sense of that. Does VBAT+ fluctuate?
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Old 01-09-2014, 07:33 PM   #50
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Default Re: Toshiba L650 power problem

yes from 5v to 8v
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Old 01-09-2014, 08:33 PM   #51
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Default Re: Toshiba L650 power problem

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yes from 5v to 8v
VBAT+ shouldnt be that low. VBAT+ is supplied by R6005 initially, before Q6002 ever turns on. If there is no leakage on the VBAT+ rail, it should come up close to 19v.
It seems there is leakage in multiple areas.
What type of solder flux have you been using?
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Old 01-10-2014, 02:23 AM   #52
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Default Re: Toshiba L650 power problem

I use amtech solder flux.
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Old 01-10-2014, 03:52 AM   #53
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Default Re: Toshiba L650 power problem

Is it TF4300? You will need to find what is holding +VBAT low.

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Old 01-10-2014, 04:24 AM   #54
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Default Re: Toshiba L650 power problem

no, it is nc-559-asm

i desolder Q6005 and when i test it with diode test, i have reading 0,00V from both sides. S to D and D to S
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Old 01-10-2014, 05:23 AM   #55
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Default Re: Toshiba L650 power problem

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no, it is nc-559-asm

i desolder Q6005 and when i test it with diode test, i have reading 0,00V from both sides. S to D and D to S
559 flux can cause leakage also if not cleaned.
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Old 01-10-2014, 05:30 AM   #56
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Default Re: Toshiba L650 power problem

Hmm ok i will clean all components that i soldered
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Old 01-10-2014, 10:28 AM   #57
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Default Re: Toshiba L650 power problem

Hello,
I have one problem, I don't know from where I should ask. I need TTP-2410M Pro TSC drivers. If you can help me.
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Old 01-10-2014, 10:48 AM   #58
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Default Re: Toshiba L650 power problem

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Hello,
I have one problem, I don't know from where I should ask. I need TTP-2410M Pro TSC drivers. If you can help me.
very bad section to post and ask for this but here you go anyways:
http://www.tscprinters.com/cms/theme/index-39.html
driver and software > windows driver > newer version i guess
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Old 01-10-2014, 10:51 AM   #59
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Default Re: Toshiba L650 power problem

@Amelie1 - read the forum rules, post a new thread
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Old 01-10-2014, 03:28 PM   #60
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Default Re: Toshiba L650 power problem

i try to clean all places that i have soldered, but still the same
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