Re: Philips 47PFL4606 No Power Fuse Keeps Blowing
1) We still want to leave R966, Q906 for the Brownout protection circuit out for now. R947 is not part of the brownout circuit, I had you removed to isolate the standby power supply from the PFC and the 12V/24V circuit.
2) R947 (4.7 Ohms) is for supplying Voltage to the PFC IC and the 12V/24V SMPS IC, so without having it in place you will have switched 15V Vcc to run those two IC's. You will leave it out for now until we finish checking the parts in the PFC section.
3) Q907 is used as a switch to provide the switched 15V to run the PFC and 12V/24V SMPS IC'c. It is turned on when 1K pull up resistor is connected. Did you replace Q907 since the old one was shorted?
4) You need to check R929 (47K) which is connected between Gate and Source pin of PFC MOSFET Q902, we want to make sure it is not damaged.
5) Did you verify if R916 is 4R7 or not on the good board? That is important, you must verify that.
Originally posted by trunks81
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2) R947 (4.7 Ohms) is for supplying Voltage to the PFC IC and the 12V/24V SMPS IC, so without having it in place you will have switched 15V Vcc to run those two IC's. You will leave it out for now until we finish checking the parts in the PFC section.
3) Q907 is used as a switch to provide the switched 15V to run the PFC and 12V/24V SMPS IC'c. It is turned on when 1K pull up resistor is connected. Did you replace Q907 since the old one was shorted?
4) You need to check R929 (47K) which is connected between Gate and Source pin of PFC MOSFET Q902, we want to make sure it is not damaged.
5) Did you verify if R916 is 4R7 or not on the good board? That is important, you must verify that.
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