QUANTA AT3 AT5 (SCHEMATIC+BOARDVIEW)
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CATSOFT
Member
Last Activity: 03-16-2025, 11:45 AM
Joined: 02-12-2018
Location: Bucharest
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QUANTA AT3 AT5 (SCHEMATIC+BOARDVIEW)
Last edited by SMDFlea; 01-21-2024, 01:54 PM. -
HP DV9700 Intel
Hello, I have an HP DV9700 with Intel CPU....I know, it's very old, I'm not fixing this for clients, I'm a hobbyist and I like to save old stuff from scrap, also this laptop is very in between generations, and has old and new stuff. It is DDR2, but goes up to 4GB dual Channel, it has VGA but also HDMI, it has wi-fi... but it is also dual-band, it has an IDE optical drive, but it is also a Blu-ray, it has an modem but also a Gigabit LAN and so on, so it's quite serviceable.
I have an schematic and board view for it, have good electronic skills, but lack knowledge for this specific model....Last edited by SMDFlea; 01-21-2024, 01:56 PM. -
PS4 Slim SAF-003 2 Sec BLOD
Hello, can someone with some experience help me with this PS4. I'm good with electronics, but without a schematic or board view cant find the fault. The board powers on 2 sec, so it's an power supply issue somewhere on the board. 12V come in, I can see 5V and 3.3V, but APU and RAM does not get powered on. On the thermal vision camera I can see for the 2 sec that it powers on an voltage regulator from 5V to 3.3V that powers the IR35211A controller that light up. The IR35211A controller get's power on VCC 3.3V and 1.8V on V18A pin, but nothing on EN and PWROK. I don't know the board and cant find... -
Re: Lenovo G40-30 Mainboard repair
OK, i checked it with an oscilloscope, CS does go low momentarily, but that is the only one, the other pins: SO, SI, SCLK show nothing. Actualy on power up SI an SCLK go low and stay low. But i did a read and write on the SPI ROM with one got from this forum, every compare was ok. Maybe i need another image from somebody. -
Re: Lenovo G40-30 Mainboard repair
OK, the HDD issue explains itself. I powered the HDD from the same supply but without the data lines, and it's spinning, also tested another HDD in the SATA connector, and does not spin up. Probably a safety feature, it only spins the HDD once the system is functional. I don't see how it does that since the data lines are separated by capacitors. If you power the HDD on it's own, without data lines, HDD powers up. They should add a safety feature for that, don't spin if no data communication. Anyways, that besides the point.
The PLT_RST#...Leave a comment:
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Re: Lenovo G40-30 Mainboard repair
But this does not explain the weird behavior the HDD has. Why wont it spin up, it has 5V power, but nothing, not even noise. If i connect it to a stand alone 5V power it does spin-up. Could the 5V power source provide bad current, the system cant detect this problem, does power up, but not working.Leave a comment:
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Re: Lenovo G40-30 Mainboard repair
Q4601 working ok. +5VALW has 5V and when i turn on, +5VS has 5V, for that mater, all other power switches mosfets are working ok. I even checked the power sequence diagram. Everything is turning on ok.Last edited by CATSOFT; 05-09-2018, 05:00 AM.Leave a comment:
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Re: Lenovo G40-30 Mainboard repair
Ok, i watched a couple of videos, apparently i need an programmer for that. Witch is about the same price as the motherboard. I'm a hobbyist, not a laptop service. Could that be the problem? Start-up the power but not allow the SOC to run? Or the HDD spin, or the screen to turn on the back light?Leave a comment:
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Re: Lenovo G40-30 Mainboard repair
No, i did not. How do i go and do that?Leave a comment:
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Lenovo G40-30 Mainboard repair
Hello, I've received a laptop for repair a few months ago and haven't been able to repair it. The person gave up hope on it, but for me it became a personal thing now. It's a Lenovo G40-30 laptop with a ACLU9/ACLU0 NM-A311 motherboard. The symptoms are pretty simple, power up, power led on, no image, not running/booting. The screen doesn't turn on, no image on VGA or HDMI, no HDD activity (not even spinning) on AC or battery. The SOC starts to get warm in a matter of time.
My first thought was that it was a bios issue, as i read in another thread on this forum. So i got a programmer and... -
Re: New Members - please post your introductions here
Hello, my name is Gabriel. I'm an hobbyist electronics guy, i like to thinker with everything i get new, also i'm the family repair guy. I've been working with electronics ever since i was a small child, also i like IT also.Leave a comment:
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