I think it has more to do with the bill validator harness and its connections.
Only when the BV is ready to accept bills, will it send a signal, or route power to light up the bezel.

I'd try this...>>> With the power OFF, un-plug and re-plug the BV harness, both at the BV, and at the backplane header.
Maybe it's just a bad pin connection?

Your machine is most likely a model K-100-1149 or K-100-1150 which is a single line 3-coin Dollar wide reel that pays L-R & R-L and you’re right, there is next to nothing available on these machines. They were built with Games of Nevada and the project ended before it ever took off. No one liked them. Did you get this one in ND by chance? The Bally strut part # was M-1876, but that’s not going to help you. I bought some replacement struts several years ago and had to use the collapsed and extended lengths to find the correct strut. The measurements are taken from center to center of each eyelet. Be sure to also record that measurement in mm. The struts are rated at 50 nanometer, which is very important to know. 25n is too weak and 100n is too strong. I may have a schematic for yours. I do have the manual which describes the machines game flow from coin-in to end of game. This is the only thing you’ll find, other than a schematic, to help you troubleshoot.

sorry i missed the pictures
I checked all the fuses of the board they are ok. I join a picture of the board and of the hopper jam picture. Yesteerday when I tried to power on the machine it has a "clack" of a relay on the right side and the the coin separor green light lit on but decreased quickly. It never occurs after.

Check fuses F4, F5 and F6 on the main power supply.

Can you post a photo of the hopper jam light?