Re: Acer Aspire V5-431 no backlight
Yeah, the driver was the problem. Windows reinstalled, and it now works in normal mode as well.
PanicMechanic
Member
Last Activity: 10-28-2022, 01:42 AM
Joined: 05-12-2017
Location: Belgrade
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Re: Acer Aspire V5-431 no backlight
The fuse is present. It is the main fuse, that goes directly from the pin 1 of the connector on the motherboard, and is fed by the 19V from the power adapter.
I will report back on Friday.Leave a comment:
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Re: Acer Aspire V5-431 no backlight
OK, I have connected 19V to the BL_PWR, and it now works. It lights up when the power button is pressed, as it should.
Now, when laptop is in safe mode, the display works fine.
But when it boots up in normal mode, the display does not work good at all. You can barely see some shapes, it is unusable.
I think it is a graphics driver issue. It's not my laptop, so I don't know.
But if it works fine in the safe mode, then the display is fine.
Thanks for the help....Last edited by SMDFlea; 10-26-2022, 12:56 AM.Leave a comment:
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Re: Acer Aspire V5-431 no backlight
It is not 0 Ohms. It is a few kilohms, around 0.5 Mohms and chnagning (some capacitance charging).
I will try feeding the 19V from the fuse to the BL_PWR, but the 19V is always present (as soon as the power adapter is pluged in)....Last edited by SMDFlea; 10-26-2022, 12:51 AM.Leave a comment:
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Re: Acer Aspire V5-431 no backlight
Don't know which part of the circuit generates 12V for the backlight.Leave a comment:
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Re: Acer Aspire V5-431 no backlight
The problem is here somwhere:
There is a burtn ceramic cap, but there is still 19V on it (from the power adapter).
EDIT: Nah, that is a battery charge controller circuit... :/...Last edited by SMDFlea; 10-26-2022, 12:53 AM.Leave a comment:
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Re: Acer Aspire V5-431 no backlight
BL_Enable is 3.3V (pin 22 on the LCD-side connector)
BL_PWR is 0V (pins 27, 28, 27 on the LCD-side connector).
The resetable fuse is OK.
So the 12V power supply on the motherboard is the issue, not the LCD driver board.Leave a comment:
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Acer Aspire V5-431 no backlight
https://[url]https://www.badcaps.net...oard: TCM14F32[url]https://www.badcaps.net/forum/showthread.php?t=75984[/url]
Same laptop, same issue (display works, but no backlight)....Last edited by SMDFlea; 10-26-2022, 12:54 AM. -
Re: acer v5-431p schematic needed
BTW, the posted schematics does not help. Backlight power page is blank.
EDIT: This is just the schematics request topic... -_-Leave a comment:
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Re: Extech EX330 multimeter current range offset fault
Here you are:
[url]https://drive.google.com/file/d/1Wk9OygvzoWjlSMBFLmfhQ7nPSDS5pX8Y/view?usp=sharing[/url]
[url]https://drive.google.com/file/d/1WlLSsZgsAjuCJL5nsGnE3Etol_koPCO-/view?usp=sharing[/url]
It seems that you are missing 2 contacts.
Or possibly you have a lower specification model that does not have those contacts, maybe?Re: Extech EX330 multimeter current ...=sharing[/url]Leave a comment:
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Re: DTK 400W PSU Power Good signal 0V fault
Well, I installed it back in the computer and it seems to work fine.
Maybe it was that cold joints on that 1uF 50V cap. And the cap for the -12V rail.Leave a comment:
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Re: Extech EX330 multimeter current range offset fault
OK, it is fixed.
I don't know what did it.
I reslodered all through-hole solder joints. Cleaned the PCB. Not tightened the 3 PCB screews all the way (before I had always tightened them all the way).
And it shows 00.00 now.Leave a comment:
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Extech EX330 multimeter current range offset fault
My multimeter has developed this fault, a few months ago. I tried to fix it, but had no success.
The fault is that on the current ranges it never shows 0. Does not matter if the probes are open or shorted.
As you can see from the pics, the offser is the same (just multiplied for other rages):
-4.9 uA
-0.49 mA
-0.49 A
I don't know what exactlly caused the fault.
The meter had a battery leak before I noticed the fault, but I am not sure if the fault was present before that happened. I just did not noticed. The battery leaked...Last edited by PanicMechanic; 05-11-2021, 11:20 PM. -
Re: Digital Multimeter Brymen 896s Issue
There should be a rectifier (diodes) at the imput for the AC voltage, and also one or two capacitors and resistors. Maybe some of them are blown.Leave a comment:
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Re: Digital Multimeter Brymen 896s Issue
Extech are not helpful either. And I used my work email adress, and no reply......Leave a comment:
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Re: DTK 400W PSU Power Good signal 0V fault
OK, you where right. I have loaded the 5V rail with 5 Ohms, and the -12V rail voltage vent above -12V. And when loaded with 50 Ohms, it dropped to -11V (and a bit above).
And... The PG signal is 5V.
I also changed a couple of 10nF 100V film caps next to the comparator, but the PG was still 0V, untill I loaded the 5V rail.
I did check the PSU a few days ago, with some 20 year old motherboard and CPU (on the table), and the fan on the CPU did spin, but the PG signal was 0V. Maybe it was not loading the 5V...Leave a comment:
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Re: DTK 400W PSU Power Good signal 0V fault
I actually did remove the output toroid, and checked everything under it. It all measured good. Now I have soldered it back, so too late to replace the diodes (but they do measure fine). :/
I think I have checked that cap, but I will check it again.
Everything I have been doing with PSU on the table (unloaded). I will try to load the 5V rail a bit.Leave a comment:
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Re: Troubleshooting B&W Original Powersupply
You can use basically anything from this: [url]https://export.farnell.com/w/c/passive-components/capacitors/aluminium-electrolytic-capacitors/leaded-aluminium-electrolytic-capacitors?capacitance=470uf&voltage-rating=16v|25v|35v&capacitor-terminals=radial-leaded&operating-temperature-max=105degc&range=inc-in-stock-grp1[/url]
Not sure what voltage you need, I put 16V to 35V. These are all low ESR.Re: Troubleshooting B&W Original Pow...ock-grp1[/url]Leave a comment:
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Re: DTK 400W PSU Power Good signal 0V fault
Actually, ony a single cap for the -12V rail. 220uF 16V. Changed a few caps instead of that, Jamicon SK 220uF 16V, Nippon Chemi-Con KY 220uF 25V and even Nippon Chemi-Con KZG 1000uF 16V.
It behaves the same. With 50 Ohms load, the voltage drops from -11V to -9V.Leave a comment:
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Re: Chieftec GPS-550AB-A (Delta OEM)
Maybe the caps, when they are discharged, draw too much current to charge up (if they have very low ESR) that the over-current or under-voltage protection kicks in.Leave a comment:
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