Re: Phillips 22 inch no power high pitch transformer noise
Assuming the new diode shorted out, what would the next step be?
Tonymon1
Member
Last Activity: 07-15-2013, 04:08 PM
Joined: 09-24-2012
Location: Caledonia, NY
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Re: Phillips 22 inch no power high pitch transformer noise
I have not reopened the set yet, but based on the transformer sound, I strongly assume so.Leave a comment:
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Re: Phillips 22 inch no power high pitch transformer noise
I replaced D668 and the unit powered up nicely, twice. When I moved it to it's normal location it wouldn't turn on and the same noise came from the power supply transformer.Leave a comment:
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Re: Phillips 22 inch no power high pitch transformer noise
The digikey looks just like it. Should this be something I might be able to obtain locally?Leave a comment:
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Re: Phillips 22 inch no power high pitch transformer noise
The service manual says that D668 is a Zener diode 20BSB-T26 with a part number of NDTB020BST26. Does that match to a real number?Leave a comment:
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Re: Phillips 22 inch no power high pitch transformer noise
The part number is listed as NDTB020BST26. Right now it is the only one that is suspect.Leave a comment:
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Re: Phillips 22 inch no power high pitch transformer noise
Interesting results. I did unsolder one side of each diode to check them out of the circuit. When I put the meter on diode check, it said 0l. So I assume that is an open circuit.
D607 gave readings of 0l in one direction and 707 in the other. No sound. Diode D668 read 1s in both directions and the meter made a continuous sound.Leave a comment:
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Re: Phillips 22 inch no power high pitch transformer noise
I checked them both with my analog meter. D607 and D668 both have continuity in both directions. Is there a specific readng I am looking for? I can get a DMM. Actually, it's time I got my own.Leave a comment:
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Phillips 22 inch no power high pitch transformer noise
Please help. Phillips 22PFL3504D/F7 mfd 11/09. No power. Power supply makes high pitched noise. Caps look OK. No bulges. No leaks. R603 to R606 approx 470 ohms (analog meter). No voltage out. Please help me troubleshoot this. Thank you.
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