Humax had a bad reputation (5400Z) some time back with a power supply board problem so I wonder if this could be some of your problems?
If you wanted to check, if they still use the same configuration check the tops of the large caps and the sides.
The top used to buldge quite noticebly but if that is the problem and not corrected it can take out not only the caps but a Zener and resisters from memory.
The Power board was a stand alone one and easy to see BUT dont touch ANYTHING when its turned on as it can bite and some of them heatsinks really are HOT !!
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