I have a blank screen when I turn it on and nothing happens but the sound works.

Fault to its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

It sounds like the internal calendar function is working perfectly.

Fault to its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

If you think the back light is working then check out the main board since you have no pic and no sound.

Are you check fuses? and harnesses connections.

I have exactly the same fault and looking around so has lots of others aswell!

can u hear any sound like nokia tune which comes when u turn on your mobile? It could be because your display is damaged or not working so please visit nokia showroom and they will help you.

There can be several things which can be reason for blank screen like:
1. Your display is not working
2. Battery of mobile is not working.
3. May your mobile is not charged and charger which you are using is not working. Try charging with some other charger of nokia same pin.
4. It could be software issue. Please update software in your mobile.

60% it could be a display issue.

sounds like a classic psp bricking...sort of

Can you see the menus on the screen?
Can you hear audio (sound)?
If you can hear sound but no menu we need to check the backlight.
Take a flashlight and shine it on the screen, look very closely at the screen.
Do you see a video image?

Let me know what happens, I can assist further.
lone99star

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/jason_77a19afa8d604dee

Is there another input you can try?