Television and Home Theater

I have a 4 year old LCD Sharp LC-13B2E model with a recently developed fault. Some technical guidance would be appreciated.Thanks. When turning on the power now it stays in permenent standby (red light on, but no green). Prior to this inactivity days previously it had flickered off a few times but I brought it back to normal by flicking channels on the remote. Fault is not due to remote control batteries. No bumps/knocks have taken place. I have tested adapter which gives 12v to the circuit. There are 3 main circuit boards inside (plus 3 small ones at the top/bottom).

I have a Mitsubishi ws-65819 that has convergence problems. It initially had a convergence problem for a minute or so and then lost power. I found 1 fuse in the 24V section to be bad and replaced it. The TV worked fine for a couple of weeks. The convergence problem came back intermittently at first but eventually stayed and I lost power again. I then replaced the 2 convergence IC's (IC8C01 267P150010 HIC - STK392-570) and fuses (F9A04 283P043090 FUSE - LF251 5A and F9A05 283P043090 FUSE - LF251 5A) the TV initially came up OK but after a few minutes the convergence went out again.

I've noticed in a previous discussion that the color wheel can cause a buzzing noise and need to be replaced.  I have a TV in which the color wheel is actually squealing like a bad bearing.  The TV will not come on either.  As soon as the power button is pressed it tries to come on but the squeal starts and the green light starts flashing.  My question is can the color wheel be the cause of the TV not coming on.  I wouldn't mind buying the CW and replacing it, but not if there is another problem.