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PC LCD blinking and then shutting off

I’ve got an all-in-one desktop (ThinkCentre A70Z) and the display stopped working. I replaced the LCD itself and finally got a picture, but upon startup, the screen blinks on and off twice while beeping (the display itself beeps) and then it stays off. I’ve also replaced the motherboard, which allowed me to replace the processor and the graphics card by default because they came with the board. Still doing the same thing.

I’m thinking it’s the inverter board because it’s the only other thing display-related that I haven’t replaced and the symptoms don’t seem to match anything else like a board problem or a power supply problem. Also, I did check and made sure everything was securely plugged in.

Thoughts? I’m at a loss and I miss my computer.

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Hi @sprinklecake ,

Is there a pattern to the “beeps”?

If so, here’s a link to the hardware maintenance manual for the computer.

Scroll to p.60 to view the various beep codes and see if your beep error code is listed.

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Hi @jayeff, and thanks very much for taking time to respond! My motherboard is beeping (3 short beeps and that’s it), but from what I can tell, it’s doing that because I reset the BIOS, so I know why it’s doing that. That code wasn’t listed anyway, but I found that info elsewhere.

The LCD itself is beeping very faintly. It blinks on for a second and there’s a light squealing noise, then it goes of and it doesn’t make a sound. It repeats this once more and then stays off while the computer continues to run.

For the couple moments I can see the screen, I see a screen that allows me to enter the BIOS settings by hitting F1, which makes sense, so I’m pretty sure this is a display issue and not the board or power supply or anything else, if that helps.

Hi @sprinklecake ,

Bit confused.

You can get into BIOS and the screen stays on is this correct or does it go off after a few moments even when you're in BIOS?

If you can get into BIOS and the screen stays on then this indicates a driver problem when the OS is started as there may be monitor drivers required.

Try starting in "safe mode" (check online for how to start in safe mode for your OS) and see if the display stays on or not.

In safe mode only generic OS drivers are loaded and not drivers specific to the hardware and OS

Don't know the desktop, but some other thoughts come to mind.

Does it beep 3 times every time that you start the desktop? Has it always down this even when it was working OK?

This seems unusual to me as most PCs only beep the once for a successful POST.

Try removing the RAM modules (see p.79 of manual) and check if this alters the beeps from the desktop at all. It should stop POST and beep a pattern

Did you check that you got the correct replacement LCD panel? Did it have the same part number on the back as the old panel?

Did you get a new LVDS cable with the panel or are you using the original?

Sorry if I confused you! What happens when I start the computer is it blinks on and off twice at startup before it stays off entirely. The first time my screen comes up, I see something about pressing F1 to go to the setup screen (which I did) and the second time the screen blinked on, I saw the BIOS settings screen. Then the screen went off and didn't come back. So the computer itself is functioning just fine - the display is the issue.

I can't start in safe mode because I can't see the display long enough to select safe mode. But I also reset the BIOS on the board, and the three beeps I think are because of that. I've also reseated the RAM and tested them and they're okay too.

I'm totally sure I got the exact same LCD as before and it's also brand new as opposed to refurbished, so the LCD should be fine. Before I got the new screen, I didn't get a picture at all and now I do, just for a couple seconds. I did get a new LVDS cable with my board, but it seems the new one causes more issues than my old one.

Hi @sprinklecake ,

With the computer on. check if there is an image on the screen by shining a torch at an angle close to the screen to see if you can "see" it when the screen is off.

It will be very faint so try it in a darkened room if possible.

If you can see an image then you have a backlight problem and the inverter is probably the cause since it is a new panel and LVDS cable (assuming the backlight power supply to the screen is incorporated in the same cable and not a separate cable to the panel).

other than that you don't really know if the computer is functioning correctly and actually booting to the OS or not.

Did you try removing the RAM as suggested to see if POST was stopped and that you got correct error beeps? You only said that you re-seated the RAM. The intention here is to see if the POST procedure was working OK (up to RAM verification anyway) and detecting that the RAM was missing.

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