The number illumination has gone out. How to fix?

If your lamp does not illuminate, then a faulty bulb, a faulty power outlet, a faulty switch, a faulty light socket, a faulty plug, a faulty brass tab, or a faulty cord may be the issue. You will need to troubleshoot the issue to fix the lamp.



This link might help: https://removeandreplace.com/2018/11/14/lamp-stopped-working-how-to-fix-a-faulty-light-lamp-repair/

"digital display's" do not use one bulb for illumination, usually a 7 segment LCD display is used. The entire display will have to be replaced, IF the display is at fault.

The back-light for the display has gone out from the sound of it. Contact Pioneer if it's still under warranty or find a place that fixes or could help you to fix the radio.

I would send it to them to be checked.

Bushnell
Attn repair
9200 cody
overland park KS 66214

make sure to put your name, address, telephone number, and a detailed description of the issue in the package.

There is a small fuse in the cab fuse block ,for the insterment panel that is verry easy to miss if you don,t look close ,it is hidden kind of at the top of the fuse block behind the wires,

The following procedure will work for RCR311, RCR412, RCR420, RCR612, RCR812, RCR815, D770 and other similar models.

Code Retrieval

Step 1: Press and hold the component key (TV, DVD, etc.) whose code you wish to retrieve. The illuminated ON/OFF key turns on. {Some models like the RCR450 have a LED indicator light in place of the illuminated ON/OFF key.}
Step 2: While holding the device key down, press and hold the INFO key. The illuminated ON/OFF key will turn off.
Step 3: After holding down both keys for 3 seconds, the illuminated ON/OFF key turns back on.
Step 4: Release both keys. The illuminated ON/OFF key remains lit.
Step 5: Starting with the number 1 key, press and release each number key on the keypad in the following order: 1 to 9, then 0. The number that causes the illuminated ON/OFF key to blink is the first number of the code.
Note:
TV codes begin with the number 1
VCR codes begin with the number 2
DVD codes begin with the number 3
Satellite receivers and cable boxes, codes begin with the number 5.
Step 6: Repeat step 5 until you have retrieved all 4 numbers in the code.
Step 7: After the fourth number is retrieved, the illuminated ON/OFF key blinks briefly, then turns off.
Note: To exit the Code Retrieval Mode, press and release the "GO BACK" button at any time.

Hope this helps.

You serious ? I think the flux capacitor is gone !!

your display screen has burnt out. as far as i know the only way to fix it is to replace the whole radio

If it is Yamaha,that model is obsollete,you have small chances to fix it

can you check real close if the screen is very faint instead cause if the illuminator is gone then you might just need to get that fixed instead of the whole screen.