How do I fix the inbuilt flash which is not working

Hi,

Are you using bracketing mode (or HDR)? Have read that when using this mode the flash is fully disabled.

It may be either a faulty capacitor C901 (see p.2-2 of the service manual) that provides the voltage for the flash or perhaps it is a faulty flash unit (see p.2-4 part #65)

Here’s a link to the service manual for the camera.

You may have to contact a reputable, professional camera repair service or opt for using an external flash unit if dis-assembling the camera seems too daunting a task