Picture screen is dark. sound is working but no

Just change everything, or take this advice.

https://www.fixya.com/support/r29790007-repairing_own_television

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Could be the ballast boards for the white light.

Hello
Just check whether there is any trace of picture [will be ver dark indeed]; can be seen on screen. Do a close watch and inform me. As far as sound is OK, there must be a dark shadow of picture on screen. I can post a solution to your tVs trouble only after get this information. OK.

This sounds like low screen voltage(A1)try adjusting the a1 voltage bottom control on flyback transformer if you have a voltmeter, voltage on crt base possible market screen or A1 shoud be beteen 350/500 volts when making adjustment remember to take into account current taken by meter If voaltage will not adjust flyback transformer will have to replaced

sounds like it could be a cabling issue, try replacing the cabling (if you have another tv, you can borrow the cabling before purchasing new set of cabling)

More information is required. Your backlight is lit (screen not dark) but I need to know what you have connected to the TV (your sources) and how they are connected. Does the menu/OSD (on screen display) work?

where can i buy Deflection board for RCA D52W20

Symptom: NO PICTURE
Cause: DEFECTIVE 3D/YC COMB FILTER
Symptom: DARK PICTURE
Cause: DEFECTIVE 3D/YC COMB FILTER
Symptom: DARK PICTURE
Cause: DEFECTIVE C724

Solder any / all bad connections , esp. vertical output IC......

I have the same issue...help!