Phillips 22 inch no power high pitch transformer noise

[Gundesalf]

Re: Phillips 22 inch no power high pitch transformer noise

Had same problem. Did find the D688 diode defective (current flows on both directions). Before replacing it, I read the whole thread and decided to check on capacitors. I found that, although no capacitors where bulged, Capacitor C639 had produced heat damage on the board. I will try to replace the Capacitor and the Diode if possible at all. I will let you know how it goes.

[Gundesalf]

Re: Phillips 22 inch no power high pitch transformer noise

Also found heat damage on Resistor R637. So here is my shopping list:
- Diode replacement for D668: 1watt, 20volts
- Capacitor replacement for C639: 220uF, 10volts
- Resistor replacement for R637: 0.25watt, 120**-Ohms

Correction: "D688" on my previous comment was a misstype. It was "D668"; the same that showed problems for Tonymon1.

[Gundesalf]

Re: Phillips 22 inch no power high pitch transformer noise

I am currently typing this reply using the repaired Philips TV as a computer monitor. I only replaced the D668 diode. The capacitor and the resistor tested ok, so I kept the original ones.

Thanks.

[rustytierod]

Re: Phillips 22 inch no power high pitch transformer noise

Would a shorted diode cause picture to fade to white over 5 to 10 min?