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I used some randon DDR3, but the laptop needs DDR3L. I grabbed a DDR3L and it is working fine. So it was a shorted capacitor. Thanks!
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I now tested the board a bit.
I push the power button.
Lights come on, power light is on.
Screen backlight flashes for a millisecond and then all lights go off (board resets).
This is exactly the same with AC adapter and battery. Even disconnected screen and it is still same.
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I misdiagnosed the short a bit.
The PL700 that I removed is needed in the circuit. The shorted capacitor confused me.
I soldered PL700 back. Now the board is trying to start and leds flash when power is inserted. When I push power button the board is trying to start but then reseting. I think it might be charging/battery issue.
The battery charge icon is flashing (like charging) even when there is no battery connected. I connected battery and it started charging battery. (confirmed with multimeter).
I'll let the board to charge the battery and then try to start with...
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Power adapter: 1 original 1 aftermarket. Confirmed working on different dell.
PQ4 in:19,4V out:19,4V
PQ700 in:19,4V out:18,9V
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Dell E7250 5V and 3V missing
I got a dell E7250. That was dead and when plugged in the charger light would go off.
I found out that PL700 was short. I removed it.
Then next I saw that some capacitor was short. Found that PC715 was short. Remove that and now there are no shorts in 19v rail.
Next I wanted to see if 5V_ALW and 3V_ALW were present and no there is no 3V or 5V present.
Could somebody help. I cannot understand from the schematic what chip does create 5V_ALW and 3.3V_ALW?
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Re: thinkpad a485 bios password
Sorry about serial.
Thank you!
I did the mod with autopatcher. Then soldered chip back. Followed the tutorial, it froze on going to bios screen. Soldered chip off and back to programmer. Programmed the previous unmodified dump and it then got to bios. (Y)
Did also 10$ donation. ...
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Re: thinkpad a485 bios password
Hello!
I bought dead A485. Removed USB-C port that was shorted and now it has bios password.
I did take off the bios chip and read it.
Could anyone modify so I could remove password?...
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Re: 32LG2000 wouldn't turn on
I changed the NCP1396AG, nothing changed.
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Re: 32LG2000 wouldn't turn on
I did bigger pics:
[url]http://s254.photobucket.com/user/Kaar3l_2007/library/32LG2000%20-%20EAY4050440?sort=3&page=1[/url]Re: 32LG2000 wouldn't turn on<br /> ...3&page=1[/url]
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Re: 32LG2000 wouldn't turn on
Just tested that, only 5V is present. 24V and 16,5V are missing.
I did a picture under light, hope it is ok....
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Re: 32LG2000 wouldn't turn on
I tried unplugging inverter and then powering it on, and results seemed the same. I tried watching picture with flashlight, but didn't see anything.
But couldn't be a problem on the other side of power supply some small smd chip(NCP1396AG)?...
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Re: 32LG2000 wouldn't turn on
Just tested and from 24V line comes about 0,3V, so 24V is gone also.
I noticed weird thing when measuring the voltages, if I bent slightly the board, then a quiet buzz noise was coming out of that transformer....Last edited by Kaar3l; 01-01-2015, 07:21 AM.
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Re: 32LG2000 wouldn't turn on
Changed optocouplers and didn't change the problem. ...
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Re: 32LG2000 wouldn't turn on
Could you give me some more hints, I haven't checked that before? ...
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32LG2000 wouldn't turn on
I have a 32LG2000 that turns on sometimes and sometimes doesn't. It was maybe 1 time out of 10 about a week ago. (tv was warm) Now I turned it on and it has been 5/5 acting nicely. I think it might turn on better when it is cold, but when it gets warm, it has problems.
I have changed a lot of caps, but the problem is still there. On picture I marked the caps with red dot that are new. I also changed caps inside inverter.
When the tv did that: Blinked 3 times, then the light turns green and it should be on. I measured then voltages from power supply and there was no...
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Re: New Members - please post your introductions here
Hello!
I am new in this forum. I have been repairing computers and tv-s as a hobby.
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