Sony smps standby circuit

[mikesradios]

I'm taking a look at the power supply in this Sony HCD-FC9 DVD player for a friend... it sits in standby mode, but won't power on.  Been testing voltages, found low Vcc across the board.  There's a 20v regulator (Q905) off the primary that continually powers the switching IC (IC901)... only measuring 14vdc at pin 4 instead of 18.1.  On Q905 the voltages are 0.7-1.0-1.0 vdc.  (Note: schematics are linked below.  I am measuring to the correct ground when on primary vs secondary)

On the secondary side (I know I should wait to get the primary working correctly) the Vcc rail that should be 15.8vdc is only 6.6vdc.  So some part of the switching supply is working, however certainly not up to spec.

Although I'm familiar with the switch mode part, I'm a bit lost on is the purpose of D919 and D920 from line/neutral to the Vcc pin of IC901.  Voltages at PC902 (opto at primary) are correct at 2.9 and 1.9 vdc.

I'm thinking IC901 is probably okay if it will do some level of switching, but I don't see what else would load down Vcc from the 20v regulator.  C914, C901 are fine. Doesn't seem that the NPN Q905 itself is shorted.

The main filter caps are all Rubycon, no leakage, and B+ off the bridge is healthy at 163vdc.

Any thoughts or suggestions are greatly appreciated!

-Michael

Schematic: http://s1179.photobucket.com/user/mjh850830/media/Sony%20HCD/ps%20schematic.png.html
P/S block diagram: http://s1179.photobucket.com/user/mjh850830/media/Sony%20HCD/ps%20block%20diagram.png.html
IC 901 block: http://s1179.photobucket.com/user/mjh850830/media/Sony%20HCD/IC901%20block.png.html

[mikesradios]

Solved this one last nite... the problem turned out to be C914, filter on the standby supply rail.  47uF measured at half its capacitance value.