Philips 42PFL7662D 05 - Backlight Issue.

[Turnip]

Hi Folks,

Have one using inverters 6632L-0470A & 6632L-0471A (Master and slave) where backlight doesn't fire up although the Blue Led on master initially lights up then fades out.

Both board fuses are OK with 24v present, and neither drive chip nor any Fets are shot - Changed the master drive chip even though not popped.

Sound is present using Scart input. Had a feeling that even if the tubes were shot there would be an initial flash, but there isn't, and no indication of backlight voltage with a neon or digital meter near the backlight transformers.

Any thoughts ? - Thanks - Chris.