I got an advice, to try to flash firmware from #4 post:
[url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/bios-requests-only/83983-edp51-edb51-la-h331p-rev-1-0-a00-bios-needed[/url]
Problem fixed ( the model is XPS 15 7590 if someone is interested )https://I got an advice, to try to f...s-needed[/url]
YellowJacket
Senior Member
Last Activity: Today, 04:12 AM
Joined: 12-27-2020
Location: Slovakia
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// UPDATE: I found some info, I can figure out, which one of these it is by finding its GPU. This one has [B]N18P-G0-MP-A1[/B] on it ( GeForce GTX 1650 Mobile, right? ), so it should be XPS 15 7590, am I correct?
// UPDATE 2: during `BIOS flash Update` utility, there was actual bios version for XPS 15 7590, ver 1.5 . I put an most recent version 1.35 for XPS 15 7590 from DELL support, update was successfully done, but now I have no picture on the screen. Num lock key doesn't react. Why is that? I am sure, I have done everything correctly, and previous BIOS assured me, that this board...Leave a comment:
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XPS 15 7590 ( or Precission 5540 ? )
Hi friends,
firstly, I have to let you know, I am not working with DELL laptops often ( actually, I can't remember, if I was fixing some board issue on DELLs ). And now I got for repair one from my friend. He bought it as a not properly working one, and its history is almost unknown. The issue is, it can not boot. This is not important in this situation.
Now, let me clarify the confusion in the topic name - the friend claims, that the model is Precission 5540. And when I get into BIOS settings, I can see the service tag [B]CMR4533[/B], which indicates he is right. But... -
Well, I replaced it for N-channel mosfet from some donor board, with really high maximum drain current, and it works just fine. If this thread can be deleted, you can do it so. Sorry for useless thread.Leave a comment:
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Identifying a component
Hello friends,
I have difficulties with finding this component online: "312L", with 'L' letter underscored. Damaged component is from a drone, and It is connected to a motor ( with the upper leg ). Any ideas, what it is? Looks like some N-channel mosfet to me, even by measuring another, working one, it behaves exactly like N-channel mosfet. But I would like to find the exact component, to be sure, what parameters it has. For proper replacement.
Thank you in advance for any hint.... -
Hi. For now, I took it off, since I was unable to find the replacement diode array. I found some in my spares, but it was a bit bigger. Still have TV, so if I find sone replacement, I will solder it.
BTW, is there a big chance, that TV will be damaged without the diode array in a way, that it is unrepairable?Leave a comment:
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Update: yeah, maybe admin can delete this topic, since after reading some topics here, on TV section, related to samsung brand, I found out, that some models have common fault with diode arrays, located on that small board connected to panel. In my case, D001 was the culprit. But for future reference, the array is shown in attachment....
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Samsung QE55Q60RAT - no picture
Hi friends,
a friend of mine gave me this TV to fix, with common SAMSUNG TV issue - damaged panel. Turning on, sound is present, but no picture. So I went directly to standard process, connecting two pads together with a wire ( see in the picture ), and then removing flex cables. With right flex connected, there was half screen working, but still no picture ( disappearing colors and similar weird stuff ) + working sound. With left flex connected, TV is restarting + working sound. I supposed, left side is damaged, so I then blocked all 8 CLK pins ( going from 0R resistors on the second... -
Samsung watch 4 - not turning ON
Greetings folks,
I wonder, if there is a section for troubleshooting also smart watches in this forum. I put it there, because it is closer to mobile devices, I suppose.
Anyway, I got this watch as not working after very long time of not using them ( not sure, how relevant is this information, it could be also any other issue, but that's what I was told ). Indeed, the battery was totally low = 0V, but even after reviving it with the help of PSU, or even if I replace battery with PSU 4.0V, there is no sign of life after pressing the power button. Pressing both buttons should... -
Correct me, if I am wrong, but command from mentioned script:
[code]fpt64.efi -f image.bin[/code]
is for flashing from USB I believe. So if I want flash that binary with the help of the programmer, I just flash [b]image.bin[/b], what I did.Correct me, if I am wrong, but command from mentioned script:Code:Correct me, if I am wrong, but command from mentioned script: [code]fpt64.efi -f image.bin[/code] is for flashing from USB I believe. So if I want flash that binary with the help of the programmer, I just flash [b]image.bin[/b], what I did.
[code]fpt64.efi -f image.bin[/code]Leave a comment:
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I was trying this as a first resort. But sadly, this hasn't solved the issue.
And no, I am unable to get into the BIOS setup, there is just nothing visible on the screen.
Anything else, I can try? I hoped, it will be possible to fix oroginal bios dump somehow.Leave a comment:
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Gigabyte GB-BXBT-1900
Greetings, everyone!
Would need some help with this mini PC, the issue is - after turning on, PC starts, but there is no picture on the screen, no reaction on LED in external keyboard. Tested with another known good RAM. All voltages are present. Looks like BIOS issue to me, right? I tried binary from this site --> [URL]https://www.gigabyte.com/Mini-PcBarebone/GB-BXBT-1900-rev-10/support#support-dl-bios[/URL] ( version F9 ), but still same behavior. Note, I flashed only BIN file from that archive. Although, it says "1.0" in the linked site, but I have board with 1.1 revision.... -
You are correct, thank you so much! Have a nice day.Leave a comment:
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Identifying a DC/DC step down converter
Hi folks.
Any help with identifying this IC? Should be some DC/DC step down converter. 'ACF G45' ... I thought, it is Monolithic Power Systems ( based on this topic --> [url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/80630-ic-marking-codes-and-datasheets[/url] ), but can't find this marking there. Will be thankful for any hint. Thanks in advance.https://Hi folks.<br /> Any help wit... Power Systems... -
Thank you, [USER="169897"]piernov[/USER]. Actually, you hit the jackpot. Amazing deduction!
I tried to hook a PSU on the LDO 3.3V output ( even, if there is kohm range ), and current consumption was around 300 mA. And no, it was no EC. There was two schottky diodes in its way, and behind second diode was like zero point something resistance to ground. Injection of 0.9V at that point heated up PCH in up-right corner of its crystal. So yeah, nice to meet you, donor board.
I only wonder, if this was just random failure, or the customer did something ( he previously...Leave a comment:
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Looks like I am not alone, who is lost in this case without schematic. So to finish it somehow - do you guys at least have any idea, how to confirm dead EC ( corrupted EC firmware included ), eventually dead PCH, without schematic?
Also, is 1.4 ohm resistance to ground on that 1V power rail too low?Leave a comment:
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Thank you [USER="149220"]mcplslg123[/USER] , you gave me really difficult task though.
I tried to analyze the circuitry as much as I could, and I looked around both 5V coils and the 3.3V one. But all three had nearby an IC, which was hard to find datasheet of. First picture is an IC connected to 5V coil on the left ( from picture in first post, 3k5 resistance ). Second picture is an IC connected to 5V coil on the right ( 22R5 resistance ). Third picture is an IC connected to 3.3V coil ( 3k3 resistance ).
Anyway, I was able to measure 3.3V on one capacitor nearby...Leave a comment:
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Hi [USER="295753"]mon2[/USER]
1.) I flashed there original bios dump, after cleaning its ME region. As I mentioned, the laptop behaves always the same though. If you think, it is bios related, let me know, I will ask here on badcaps for another dump
2.) First DCIN mosfet is AON6428, second mosfet is AON7414. Charger IC is BQ738
- about LEDs : the one on the charging port, it is all time turned off. Then, there are three LEDs under power button. These LEDs are meant to shine together I believe, and this power button lights all the time, from...Leave a comment:
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