Television and Home Theater

My KDF-50E2000 will not turn on, fan starts then stops and power light blinks red code 3.

I have spoken to sony, said check bulb door. no luck

At first the TV would shut off by itself but we could start it again and it would work for approx 20 minutes before shutting off again.

I have a infocus SP4805 and i am looking for the control board . Does anyone have any access to these boards or know where i can find them . Infocus just wants me to send it in for repairs . My problem is the component input won't work while other inputs are OK . Thanks James

Can anyone tell me where I can find the convergence return resistors for a Mitsubishi WS-65315 on the PCB Main board?