On Thu, 10 Jun 2010 11:52:17 +0000, Philip Pemberton wrote:

then replace
the TEA1522P before wasting time with the opto isolator, shunt
regulator, or other unlikely candidate.

Swapped the 1522. PSU still dead, no output or startup.

Suspects are now the opto, the shunt regulator, and the resistors which
measured high.

--
Phil.

http://www.philpem.me.uk/
If mail bounces, replace "10" with the last two digits of the current year