On a Funai / Magnavox / Philips model LF501EM4 and similar models that have no power and no red led display here are the few items to check.

  1. Check for shorted C4056 or  C4051 on the IR receiver board at the 5 Volt line.
  2. When the power supply pulsates disconnect the ribbon cable going to the main and see if the voltages come up if they do then check pins 1 - 4 these are the P-ON 21 Volt line for a low resistance reading of about 30 Ohms or less if it's low then check C3214 near IC3201 and L3201 on the top left corner of the board.