The monitor does not turn on, although the light is on. What could be the problem?

Question

Do it yourself

At first, the touch buttons went berserk. They seemed to press on. Either the menu appeared, then the brightness settings, then it turned off (as if the button was pressed).
I turned it off, turned it on and now it turns on, it works for a second or two, and then the screen turns off, although the light is blue (as if it is working).
Untwisted. A couple of conders were swollen. Replaced but problem persists.
What could be the reason? Replace all conduits? Or is the problem more serious?
UPD. I shone a lamp on the screen as advised here. The image "appeared". That is, it turns out, the backlight ...

Answer 1

Shine a bright light on it. If you can see the image, then the backlight burned out.

Answer 2

Here are the buttons to start with. To check, you can simply disable the panel with buttons. And then you need devices, knowledge, and it’s better if you have a known-good inverter to check the backlight lamps. Better - in the service, if you do not do it. Otherwise, to repair one monitor, it makes no sense to purchase / manufacture all this.
Buying lamps for 1-4 pieces is too expensive, it’s more convenient to take dozens at once, so that in the end the repair price does not become exorbitant. Capacitors, as already said, not all swell, up to 100 microfarads they almost never swell - check only with a device (ESR-micro, for example, or similar). Well, then, there can be a lot of things, and a firmware rally, and something else.