Very sorry to report that I have binned at least 10 similar era camcorders recently. They have no value anymore so people do not tend to repair them. Your fault will likely be in the power supply circuits but I doubt you will find someone willing to spend time diagnosing such a fault. I can understand why you might want to do so as a learning experience, but these units really are not worth the effort for most people. Such cameras sell for around £5 in UK charity shops. The service manual is needed for a repair and, if not available for free on the internet, will cost around £25...... 5 times the value of the camera.
Sorry I do not have better news. I only buy such cameras to harvest the optical block and viewfinder. The rest is good only for scrap or SMT desoldering practice.
Fraser