Philips TV 272217100569 Power Supply No Standby

[R_J]

Re: Philips TV 272217100569 Power Supply No Standby

Are ther any markings or a letter/number on it? you may need to clean it with some alcohol. The ic's Vcc maximum is 20 volts so I would guess around 18 volt zener. Q101 supplies the Vcc to the other parts of the main and pfc circuits and it acts like a regulator/switch.It has a zener on its base of 15 volts so its collector would need about 18 volts to operate.
I found this similar circuit

[kevinm34232]

Re: Philips TV 272217100569 Power Supply No Standby

Interesting, that looks closer to this board. Can you point to something on mouser or digikey that I can use to replace ZD103? Just your best guess or what you would try.. Thank you.

[R_J]

Re: Philips TV 272217100569 Power Supply No Standby

I need to know the dimentions, What is the number on ZD102? It is 1? If I can find that number I can then find the 18v in the same size

[kevinm34232]

Re: Philips TV 272217100569 Power Supply No Standby

Here's a good picture of them both. Marking on ZD102 = 18, ZD103 = 20

I would say 1.5mm (l) x 1mm (w)

[R_J]

Re: Philips TV 272217100569 Power Supply No Standby

They are likely sod323, the 20v Digikey 1727-1150-1-ND PDZ20B,115 So ZD103 is a 20 volt zener and ZD102 is a 18 volt zener

[kevinm34232]

Re: Philips TV 272217100569 Power Supply No Standby

Ordered. Thanks again, exactly what I needed. 5 Star rating!