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Old 10-26-2019, 11:01 AM   #32
R_J
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Join Date: Jun 2012
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Default Re: Philips 32PFL3606/58

The PFC circuit is not being turned on. If it was, the voltage on the main cap would icrease. I suspect you are not getting 20v VCC, this VCC voltage also supplies ic902 pin6.
The 10 volts on IC909 pin 8 is supplied by it's internal startup cell. Check the voltage on Q903, The emitter should have ~25vdc, the base is controlled by optocoupler IC905. When IC905 is ON, pin4 will be low turning on Q903 which supplies the +20dc for IC909 and IC902 VCC

Last edited by R_J; 10-26-2019 at 11:11 AM..
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