Hopefully this will help someone!!
I managed to repair the Power Supply (17PW26-1) used on this set: Symptoms being blank screen, no backlights apparent and with only the front blue LED illuminated. I removed the Power Supply and visually checked the electrolytic capacitors for signs of distress (bulging etc.,) but all looked OK. Using a continuity meter (one with a Piezo sounder) I then went round all of the solder joints of all electrolytic capacitors by applying the meter probes to charge and discharge each capacitor - you will hear a little 'bleep' from the meter as each charges up. Reversing the leads will discharge each capacitor and again a 'bleep' will be heard. Each 'bleep' will vary in duration depending on the value of the capacitor. The bigger the value the longer the 'bleep' (charging time). I found that three capacitors indicated 'dead shorts'!! (bleeper on continuously whilst probes applied) - I unsoldered each one only to find that when isolated from the board they all checked out OK!! I then searched around the same area of the board to check other components, this resulted in detecting that D881 (BYV27-200) rectifier diode was also indicating a 'dead short' (checked in both directions using the continuity meter). Removing this component, and rechecking out of circuit, showed that it was indeed short circuited. Having a replacement to hand I then fitted this to the board, reassembled the TV and it is now in perfect working order.
