PHILIPS 42PF7220/37
No picture, No sound. TV turns On & OFF automatically.
Missing voltages from the power supply to other boards. Check and resolder all connection terminals at the connector [C221].
PHILIPS PFL 37 xxxxx LCD TV
TV turns ON, but shuts down for no reason. It happens each time when switch ON the set by AC mains ON/OFF switch.
Signal to microprocessor get On/OFF. Develops this fault. Bad front panel sendor board [infrared]. Capacitor faults. Some of the SMD capacitors fitted on it are leaking, cause voltag drop.
ELEMENT 32" LCD RECEIVER.
TV turns ON. But, No video or Audio.
If the +12V supply rail drop, this kind of fault can occur. In practice, it was measure +7.6VDC instead of +12V, and +13VDC instead of +24V
Changed the optocoupler. Check the power supply and replace the voltage control opto-coupler.
