With the POWER OFF and AC cord unplugged, measure the resistance of R131 (33kΩ) and R132 (4.75kΩ). Measure in-circuit for now.
Check 1N4007 diode for proper forward pn junction.
Check C138 (10μF) for short.

 

With the POWER OFF and AC cord unplugged, measure the resistance of R131 (33kΩ) and R132 (4.75kΩ). Measure in-circuit for now.
Check 1N4007 diode for proper forward pn junction.
Check C138 (10μF) for short.

WOW that's it R131 is dead Thanks a lot for your help!!

 

WOW that's it R131 is dead Thanks a lot for your help!!

Note that R131 is rated at 1W while it has to dissipate about 3W.

It wouldn't hurt to upgrade that to 5W.

 

I will