Re: Sony Vaio SVF1521B4E- Keyboard controller NPCE985LLA0DX
Bad luck.
The "new" motherboard arrived, but it did not look new.
Anyway, I have replaced it and it did not work, the screen was black, the LEDs blinkt and the fan started and stopped. I put back my old motherboard and the screen works fine, as well as the fan.
I have reported as used and defective motherboard, even if the eBay seller advertised it as a new one.
I have received the full refund and I can keep that defective old board.
In mean time I am stalking another one.
viki2000
Member
Last Activity: 09-12-2019, 04:47 AM
Joined: 06-14-2019
Location: Lübeck
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Re: Sony Vaio SVF1521B4E- Keyboard controller NPCE985LLA0DX
I have found an alternative, "cowardly", but better, less stressful and less time consuming solution.
I have bought a new and cheap motherboard from someone on eBay UK with around 33€.
It is estimated to arrive in about 2 weeks.
I will let you know if worked fine after installation.
[url]https://www.ebay.de/itm/273982092831[/url]Re: Sony Vaio SVF1521B4E- Keyboard c... stressful andLeave a comment:
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Re: Sony Vaio SVF1521B4E- Keyboard controller NPCE985LLA0DX
I have measured the VCC 3V at startup on KC7 capacitor and was 3.6V, I guess too much.
In my case the KU1 integrated circuit is not installed.
The voltages come from the section/page 3.3V & 5V, the PU7 TPS51427A.
I think I made one fatal mistake. I have used single ended oscilloscope probe and I think it should have been differential probe or floating DSO with an isolation transformer.
After the measurement, there was no more voltage across KC7 anymore, no matter what I have tried. I guess more...Last edited by viki2000; 08-29-2019, 03:48 AM.Leave a comment:
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Re: Sony Vaio SVF1521B4E- Keyboard controller NPCE985LLA0DX
I will measure/record the VCC 3Vdc at the NPCE985LA0DX pins during power on moment using an DSO and come back here with the results.Leave a comment:
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Re: Sony Vaio SVF1521B4E- Keyboard controller NPCE985LLA0DX
In mean time I have replaced the keyboard controller NPCE985LA0DX.
The keyboard and mouse worked fine, I could also enter in the BIOS.
I was ready to repair Windows and then suddenly did not work anymore.
That was before my summer holiday.
After summer holiday I have replaced one more time the keyboard controller NPCE985LA0DX, because during my 1st attempt of soldering the chip, I think I was too much time with high heat on the pins correcting the short-circuits, bridges done by the solder between...Leave a comment:
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Re: Sony Vaio SVF1521B4E- Keyboard controller NPCE985LLA0DX
And do not search anymore officially the datasheet of the NPCE985LA0DX, because I have contacted Nuvoton and I have asked for it. The answer from Nuvoton is below:
"Dear Sir,
This is Betty from Nuvoton Sales Dept. Nice to meet you and thanks for your inquiry.
NPCE9m5x is a customized part number. Due to NDA, we cannot provide the datasheet to you. Sorry about it.
Best regards,
Betty Kuo
TEL: +886-3-577-0066 EXT: 31734
"
NDA=Non Disclosure Agreement...Last edited by viki2000; 07-16-2019, 12:34 AM.Leave a comment:
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Re: Sony Vaio SVF1521B4E- Keyboard controller NPCE985LLA0DX
The schematic is not a problem.
I have found a closer version than the proposed Dell.
Attached is the SONY VAIO SVF1521DSGW DA0HK9MB6D0 REV. D.
The problem is to know the right/proper values of the signals at the pins of the NPCE985LA0DX chip. A datasheet would help a lot for that....Leave a comment:
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Re: Sony Vaio SVF1521B4E- Keyboard controller NPCE985LLA0DX
I have used a USB microscope to check the pins for soldering problems and possible short-circuits.
I checked that again and again during and after soldering process and I made also photos.
Maybe is not the best soldering, but it seems good enough to me:
[url]https://tinyurl.com/yxjyexwn[/url]
If some small particles can be seen, those are not soldering remains, but some hair/fiber from a brush that I used to clean the pins/PCB together with dedicated PCB spray cleaner.
It worked fine for...Leave a comment:
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Re: Sony Vaio SVF1521B4E- Keyboard controller NPCE985LLA0DX
Hi,
I have replaced the Keyboard controller NPCE985LLA0DX and the touchpad and keyboard started to work yesterday, but today are not working again.
I have also installed new keyboard and new touchpad.
I refuse to believe NPCE985LLA0DX is dead again.
I rather think is a small component nearby cracked or any other component failed or a PCB trace cracked/destroyed.
But from yesterday until today ?...
I cannot enter in BIOS. Of course if the keyboard and touchpad are not detected,...Leave a comment:
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Re: Sony Vaio SVF1521B4E- Keyboard controller NPCE985LLA0DX
The NPCE985LLA0DX chip does not become hot, neither the touchpad nor the keyboard.
When you say to measure the voltage, do you mean directly on the chip NPCE985LLA0DX pins?
It is a bit difficult, the pins being so small and close one to another.
If I look on the schematic, the keyboard is connected between pins 34 to 54 at K/B GPIO and the touchpad at PS/2 pins 27, 25, 11, 10, 71, 72.
Is that right?
How to measure it? With voltmeter on DC or do you recommend an oscilloscope?
What values...Last edited by viki2000; 06-17-2019, 03:56 AM.Leave a comment:
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Sony Vaio SVF1521B4E- Keyboard controller NPCE985LLA0DX
Laptop: Sony Vaio
Model: SVF152C29M
Product name: SVF1521B4E
BIOS Chip: Winbond 25Q64FVSIG
Motherboard: DA0HK9MB6D0 REV: D
The problem:
- The keyboard and the touchpad are not working at all anymore.
- Please advise what and how I shall investigate.
Steps done so far:
- I have replaced the keyboard with a new one, but the problem is the same.
- I have re-flashed the BIOS with different .bin images from net using a CH341A programmer using next guide, but the problem is the same: [url]https://www.bios-mods.com/forum/Thread-GUIDE-Flash-BIOS-with-CH341A-programmer[/url]...Last edited by viki2000; 06-17-2019, 01:28 AM. -
Re: New Members - please post your introductions here
Hello,
I am Victor from Germany.
46, 2 kids.
I feel like an old ogre that needs to learn from younger fellows.
I think is great forum with a lot of technical knowledege and knowledgeable people.
I want to see how deep can the guys can dig into electronics.Leave a comment:
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