On 06 Nov 2015 03:57:32 -0800, you wrote:
Hi All,I do not see how Q908 and R909 could be bad without Q9070 and U930
also being bad.
C944 being shorted is also a bit interesting and leaves me wondering how much else of this power supply I should be suspicious of.I would be suspicious of everything except high value resistors at
At present, replacing the components I know to be bad and powering up doesn't seem to to be the best idea given I don't know the cause of the issue.These power supplies tend to go big when they fail so I would plan on
testing every part and replacing every semiconductor and aluminum
electrolytic capacitor. There are modern replacements for every part
except the transformers.
If you have a suitable power supply, the inverter can be disconnected
from the preregulator and tested separately. The preregulator can be
tested using a 42.8 volt load.