Well I acquired a free 50" and quickly found out via some blinking and probing that the SC board was shorted. I am working through the schematics starting with page 2 of 4 and testing every thing that I can.
First thing I did was to unsolder most of the heat sinks and TO-220 components. The old Hakko 808 makes quick work of it. I still have 2 arrays to go. My initial findings are as follows:
Shorted TO-220 Components List (Not Complete)
Q401
Q421
Q422
Q423
Q601
Q661
Strangely all the diodes tested ok
Shorted SMD Components (Thus Far)
D618
I have a list of components in circuit that have values that don't match and I have to find out why. I have removed a few of them and they measure GOOD but not in circuit. I will update this list as I progress but I need to do some forum searching to find out how to test the SMD transistors and IC's.
More to come.
First thing I did was to unsolder most of the heat sinks and TO-220 components. The old Hakko 808 makes quick work of it. I still have 2 arrays to go. My initial findings are as follows:
Shorted TO-220 Components List (Not Complete)
Q401
Q421
Q422
Q423
Q601
Q661
Strangely all the diodes tested ok
Shorted SMD Components (Thus Far)
D618
I have a list of components in circuit that have values that don't match and I have to find out why. I have removed a few of them and they measure GOOD but not in circuit. I will update this list as I progress but I need to do some forum searching to find out how to test the SMD transistors and IC's.
More to come.
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