LCD Digitizer is not turning on, but phone still working as normal, screen still responding, back light is still on.

Hi Good community of Apple,
I have a question for us experts about an iPhone 4s.
I did lots of research and I didn’t find a discussion at Apple (and elsewhere) about to this.
I had recently open the phone because a simcard could not come out, and that's all I wanted to do. So I took off as far as the silver chasis inside next to the camera (not the chipboard) and got the simcard out. Then after putting everything together and turn on the phone, I found out that the screen display does not turn on -- the screen still respond, the backlight turns on (esp when receiving messages, getting out of standby mode), the call works, the sound works, etc. The phone is functioning as normal except the screen is not showing colours. Phone's been fine beforehand. Never dropped or sink into water.
Any advise please?
I've tried soft reset / hard reset, pressing the chasis again, putting into DFU mode and put into rice, and other things I forgot, but to no avail.

Try Resetting the System Management Controller (SMC) on your Mac - Apple Support GL!

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LCD Digitizer is not turning on, but phone still working as normal, screen still responding, back light is still on.

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