We solve the most common breakdowns of laptops. It is charging but there is no image on the screen. BIOS problem

We solve the most common breakdowns of laptops. It is charging but there is no image on the screen. BIOS problem

Hello, Habre! Some time ago I published an article about the most common laptop failures called “The Most Common Types of Laptop Failures in My Practice: Top 5 Simple Reasons Your Device Fails.” There is a section dedicated to the BIOS – the firmware of the microcircuit is extremely important for the operation of the device. If something happens to the firmware or the component itself, the laptop can behave very strangely.

Today we are repairing a Lenovo G50-45 – an old laptop, which, however, can be used for working with office documents, studying, watching videos, etc. It won’t turn on, but it charges – a very common problem. Details are below (spoiler – the laptop has been repaired, everything is fine). By the way, I filmed all my actions on a video, which is already posted at the end of the article.



So what’s with the BIOS in laptops?


The Internet tells us that when the computer is turned on, even before the operating system is loaded, the BIOS is activated, which is responsible for starting the computer, testing computer components, the parameters of these components, and implementing input – output functions.

If you’ve ever updated the bios, you’ve probably seen warnings like “Do not turn off the computer and power until the update process is complete.” It’s not for nothing that they warn, oh, it’s not for nothing. If the laptop turns off during the firmware update, then in 99% of cases there will be problems with turning it on. And a normal user will not do anything. There are some models that allow you to update damaged firmware from a flash drive (in HP, for example), but there are few of them. Most often, you need to take a programmer, this is a cheap device that is sold on the street, solder the chip and update the firmware already when connected to a working PC. There are also “clips” that make it possible to connect to the chip on the board without soldering, but I recommend soldering, it’s easier and safer for the board.

In my practice, bios “flys” most often in Acer and Lenovo. Masters have a saying: “In any unclear situation, the bios.” And really, the laptop can behave very strangely, but before you start digging into the components, you should try to flash it – it can solve the problem within half an hour.

By the way, the laptop may try to turn on, the screen backlight flashes, or the logo appears and everything “hangs”, or the laptop goes into a cyclic reboot – all these are most likely problems with the bios.

Lenovo G50-45 problem


When the charger is connected, the battery is fully charged vigorously – I can see this on the screen of my laboratory power supply.

But the problem is that nothing happens when you press the power button. If you look closely, the device still shows signs of life. The corresponding LED lights up, and the screen fills with black. It doesn’t flash, but at a certain angle you can see that the off screen suddenly goes black. Then, after a few seconds, it turns off again — then black again. And so many times, that is, we are dealing with the so-called boot loop, only without the logo.

This problem can manifest itself in different ways. May just flash the LED/keyboard if there is a backlight, then go out and flash again. The screen can be turned on, and the backlight can be turned on both with and without the logo. In addition, the device can freeze at the logo and without rebooting – most likely, it is also a problem in the BIOS.

I have repaired more than a dozen laptops with similar behavior, so I didn’t even measure anything now, the probability of a problem with the BIOS is 99%, especially at Lenovo.

And this means that you can safely disassemble the laptop, solder the bios, insert it into the programmer and flash it using the method downloaded from the network. By the way, there are laptops that can not be completely disassembled – their BIOS is located in the lower part of the motherboard, so it is enough to remove the case cover and that’s it – the chip is visible in the palm of your hand and you can solder it. The situation with this model is different — it has to be completely disassembled, the motherboard removed and the chip soldered.

By the way, this laptop had not one problem, but three at once.

  1. BIOS problem.
  2. Broken fasteners for screen hinges.
  3. A dark spot on the display. Accordingly, if the screen flashes, everything is ok, except for this spot of darkness. And work, accordingly, is impossible.

This is the first part of the article, here we solve the problem exclusively with the bios chip. In the second part, I will show how I fix broken fasteners, namely, plastic parts that have fallen out, washers for screws, etc. I saw a discussion of this problem on Habre, so I think it will be interesting.

Well, let’s fix the screen, in the same second part, so as not to stretch it by a third, especially since it takes 5-10 minutes to replace the screen on the right.

What do I use to flash the BIOS?


A very cheap CH341 programmer that I bought four years ago on AliExpress. Here’s one.

It also needs software. It is very capricious, in addition, it is very important to use a good cable to connect the device – the one that by default does not always show itself well. But the main thing is the software itself. I’m using a version made by one of the users on the VLAB site (searches in the corner no problem). It does not malfunction, there are no problems during several years of operation. But when I started working with the default software, I received a bunch of different glitches — from the program’s refusal to recognize the connected device to the impossibility of firmware for various incomprehensible reasons.

There are more expensive programmers, but this one showed itself well, so I don’t plan to switch to another version yet.

Everything works simply – we insert the flash drive into the clip, we connect it to the connector of the programmer, and we connect it to the USB port of a laptop or PC. Then we open the software, recognize the bios flash drive, read our image, save it just in case under an understandable name, erase the chip and write down the downloaded bios image. I download, for the most part, from three sources – the same VLAB site, domestic, then – foreign Badcaps (also searched without problems) and BIOS ARCHIVE tg channel.

Flash, remove the BIOS flash drive, solder it back to the board and try to turn it on. Sometimes it happens that the “image of the wrong model” is either not a working one, or a very similar laptop model, etc. Therefore, if it does not work, I test with two other images. If nothing happens after that, you have to look for the problem somewhere else, already on the board.

As for the current laptop, everything went smoothly – after putting the chip back on the board, I connected the screen, power adapter and power button. And the laptop “started up” from the very first time after pressing the button.

Here’s a video of how I did it. It is in English, as I plan to develop my YouTube channel, counting on an audience from many countries (by the way, subscribe if it’s not difficult). I regularly publish repair videos on the channel.

In the next article, I will show how I repaired the screen hinges/mounts that fell apart during the “repairs” of the previous owner. By the way, it seems to me that he was updating the BIOS, something went wrong – the laptop died. The owner knocked the screen, which is where the stain came from, and scrapped all this good, from where I bought it for 20 euros.

Well, now the laptop works perfectly and will soon serve the new owner – I plan to give it to an acquaintance.

Well, that’s all for now, don’t switch.

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