9 Apr
2016
9 Apr
'16
9:51 p.m.
On 04/09/2016 01:21 PM, Seth Morabito wrote:
I'm fairly surprised that the 7805 regulators
died, and that they
present this symptom (no horizontal scan) upon their death. I'm sure
there are other marginal components that will need to be replaced,
so the restoration is not yet complete until I'm confident I'm not
stressing the new 7805s too much.
Good job!
You might check to see how much current and the input voltage of the
7805 is being fed. Too high a current or input voltage can cause the
regulator to run hot. There are some remedies for that, such as
replacing the regulator with a "simple switcher" type regulator module.
--Chuck