Re: HP w2007 PTB-1773 - Where to start?

Try to change optocoupler (I802) and TL431(I803) and check all smd resistors near I803 and all resistor connected betwen optocoupler and TEA1530 pin 4. I have the same problem and it was optocoupler defect. When power suply is ok you'll have 1.5V in emitor of optocoupler.