Hello, I Am Looking For A Psu As Well. Have You Had Any Luck In Finding

I have RCA RT2770 and have diagnosed the problem.

R202 along with C211 make up the "snubber network" for the fast action diode pack (TO5 Tab mounted on 2nd large heatsink) labeled D207. This resister is so burnt, on my unit, the color bands are not readable, so the value can not be determined. Obviously, by size, this is a 1 watt resistor. This resistor goes out when C211 shorts out at high voltages. Normal testing will not show the short, since it is an arching short at high voltage. On my system C211 has no markings so I need this value also.

From my knowledge of High Efficiency Switching Power Supplies, they use high frequency switching (pulse width modulation is used to vary signal width to increase amperage under load). Snubber networks are needed to chop off the high voltage spikes that occur. These spikes vary as the input voltage varies. Typical voltage here in the US varies from 105 to 125 VAC. Therefore the spike voltages at the upper end can easily exceed 30 KVAC.

Since I used to repair switching power supplies, the design engineers typically under rate the capacitor at 10-25 KVAC, which should be 35-50 KVAC. So when you replace this capacitor, get one with same capacitance rating (critical for resonance with the frequency of the design) but add 10-20 KVAC to the voltage rating from the schematic (35-50 KVAC).

I'm trying to find the value of these 2 components, so please share if you have this knowledge.

This power supply is used in many similar surround sound and audio amp system by RCA, so this solution will be good for other models also.

Failure of the snubber network is the most common failure in switching power supplies, so hope this is added to a FAQ section, if it exists here on this forum.