Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

[resistor83]

Hello

i have a problem with this laptop

I have a lenovo z580 that turns on (without battery) but the screen remains completely black, no backlight, after at least 10 or 15 seconds the fan starts at full speed and after a while it settles at a lower speed. caplock and numlock on the keyboard do not turn on, I tried to remove CMOS battery and change ram but nothing

at this point I tried to heat the NVIDIA video chip with my station.
Now it practically does as before but only if I don't connect the ram, as soon as I connect any ram module instead and I press the power button, it flashes (1 second on and 2-3 off) and that's it, no fans and nothing else, it seems almost like trying to light up but can't. I repeat, it only does it with ram installed while without it identical to the beginning. Before heating the video chip, the fans instead started with both ram and without.

[lapfix]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

I don't agree with you when the first thing you do : heat the NVIDIA video !

as i understand the lap is working but no picture no backlight, basic steps is to change screen /lcd cable ( hope you do it ! ) then take mesuremeants on lvds connecter!
did you try the external vga ! did you try flashing bios with a clean one !

[resistor83]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

I agree with you that I shouldn't have warmed up the GPU first

as for the LVDS connector I doubt it's the cable, usually if the caplock and num lock keys of the keyboard don't light up, nothing should start
however I tried with an external video cable but nothing is seen

maybe I should have tried bios flash first
by the way: is it possible to have the dumb? i see 2 winbond chips on this board

[lapfix]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

did you try another screeen !
Post in bios section the copy of the original dump someone gonna clean it .
Did you have his schematics !

[emestee]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

Do the usual thing: test all the power rails, EC vs. BIOS negotiation, and EC reset and sleep signals.

[resistor83]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

Do the usual thing: test all the power rails, EC vs. BIOS negotiation, and EC reset and sleep signals.

can you help me for this?

I am not much expert

[emestee]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

Look at the last page of the schematics. This is a bird's eye overview of the machine's power distribution and offers some insight into its power up logic. After the basic tests (visual inspection, CMOS battery, RTC clock, voltage on the power on button, embedded controller and the BIOS chip[s] etc) you need to test everything on this chart. The chart includes the standby power, various reset and on/ok signals, and you will have to use the rest of the schematics to locate good test points and probe them. When you're experienced, you can do the basic tests with a multimeter in a matter of minutes, and then proceed according to the picture that emerges.

If all this is incomprehensible to you, then you need to stop and decide whether investing hours and hours and hours of learning is worth the savings of diagnosing and repairing a single machine yourself, at the risk of making fatal mistakes. I do not want to discourage but I have to warn you. However, if you decide to do that, all the information, tutorials and help is available here and elsewhere, and we'll do everything we can to answer your questions - but I certainly can't guide you step by step.

[resistor83]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

I work in a computer shop, I assemble PCs etc., I have various instruments, testers, welders, hot air stations, flux etc but I have a knowledge of basic electronics so I still struggle to know where I should carry out the various measurements.

However, in the meantime I dumbled the 2 chips

[emestee]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

I work in a computer shop, I assemble PCs etc., I have various instruments, testers, welders, hot air stations, flux etc but I have a knowledge of basic electronics so I still struggle to know where I should carry out the various measurements.

However, in the meantime I dumbled the 2 chips

Sure I understand that and that's okay. When I began, I had the same struggles. The question I am asking you is if you are interested to repair just this one machine, in which case you're better off giving it to someone else, or to learn the craft, in which case you need to invest some time in studying before you touch the board.

There are things that are present on every board: CMOS battery, RTC clock, embedded controller, the charger IC, standby power generation, LDOs and high load rails. You start your diagnostic with these. Your first step is visual inspection and identification of all major components. Which one is the embedded controller? Which one is the charger? After you see several boards, you realize this comes in patterns and doing it becomes easier. As a beginner, what I did was literally take a picture of the board, circle all the biggest chips, and go google their function. I very soon learned that the big coils and their nearby MOSFETs are a building blocks of PWM power generation and excellent test points. Start familiarizing yourself with the board.

[resistor83]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

I would like to learn how to diagnose problems, where I work sometimes they give me laptops with these problems, I take them home and I would like to fix them

thank you for the advice
the lapfix user was telling me to dump the 2 bios chips and i did it.
Is it better then that I resold them without making a reflash?

[emestee]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

I would like to learn how to diagnose problems, where I work sometimes they give me laptops with these problems, I take them home and I would like to fix them

thank you for the advice
the lapfix user was telling me to dump the 2 bios chips and i did it.
Is it better then that I resold them without making a reflash?

Dumping the flash is a good practice. Some will say that reflashing the BIOS is the first thing you should be doing to eliminate any chance of problems with the flash. I personally think that, because you will be operating on this board, you need to have a copy of its BIOS in case something goes wrong. However, you should only be doing reflashing once you have a reason to think BIOS is at fault. If this is your first time doing BIOS swaps, you may introduce an additional problem instead of removing one that wasn't there in the first place.

Now that you've preserved the original BIOS, you will need to identify which chip is for the CPU and which is for the embedded controller (in fact, it's entirely possible that there's more than 2 SPI flashes on the board). Open both dumps in a hex viewer and see if there's anything fishy in them (full of zeros, 0xFFs etc). If the dumps are fishy, that's a good indication you're on the right track. Flash corruption does happen. If at this stage you decide to reflash, it'll look something like the following.

Get an up to date copy for your board with a clean ME region. Watch a number of "clean me region" videos on youtube. Find a known good working BIOS for this specific machine and board. Clean its ME region, if applicable. Copy over the serial numbers, MAC addresses, Windows keys and other identifiers from the dumps. Flash it. Install the chips. Depending on where you got the BIOS and in which format, you may need to use some tools to operate on the dumps before you flash them directly into the chip. Since this is the first time you're doing it, make sure to learn the basics. Worst case scenario you'll screw it up and will have to reflash the original dumps.

[emestee]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

Searched youtube and found this:

https://www.youtube.com/watch?v=QZgMM8xNNwU

[resistor83]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

I had already seen this video, I watch many of his videos, the problem here is quite simple, it refers to the broken power connector
Anyway, I watched this tutorial (https://www.youtube.com/watch?v=qWS4B1JaoWU) for the clean Bios Region ME and I made a video to find out if I did well too (I cleaned the ME region of my dump)

This my video recorded: https://streamable.com/oaxgqs

[lapfix]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

In your video i can t see the way you de clean me , but i think you do it well ..hope that you didn't damage the graphic chip when you warmed up ..now you must see the schemetaics and beguin ta take some measurements , you have a power sequence at page 44

[emestee]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

I had already seen this video, I watch many of his videos, the problem here is quite simple, it refers to the broken power connector
Anyway, I watched this tutorial (https://www.youtube.com/watch?v=qWS4B1JaoWU) for the clean Bios Region ME and I made a video to find out if I did well too (I cleaned the ME region of my dump)

This my video recorded: https://streamable.com/oaxgqs

I can't see if you cleaned the ME data region. You should be able to test it by extracting the ME region from the built dump and seeing if 0x400 offset looks like 0x01 0xFF 0XFF etc. If it isn't your ME data region isnt cleared.

[resistor83]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

but do I have to delete the ME area from my dump or from the dump for my laptop taken from the network?

[emestee]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

but do I have to delete the ME area from my dump or from the dump for my laptop taken from the network?

No, you need to replace the content of the ME data area with a clean copy that is specific for this chipset. You can obtain this copy on this forum and elsewhere. You can also ask someone to provide you with a pre-cooked BIOS image with a clean ME data region.

If you are copying over the BIOS from the exact same known good board, it may not be necessary to reset the ME data. An alternative would be to obtain the official flash image from Lenovo website, but you may need to go through hoops before you write it directly to the chip.

[SMDFlea]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

As @Lapfix said at post #4 "Post in bios section the copy of the original dump someone gonna clean it ."

https://www.badcaps.net/forum/forumdisplay.php?f=40

Lets keep the forum organised

[resistor83]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

ok I posted over there

what about the EC should I post that too?

[emestee]

Re: Lenovo Z580 DALZ3AMB8EQ REV E black screen on startup and more

ok I posted over there

what about the EC should I post that too?

If you mean the EC part of the BIOS, no.