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With the symptoms you are describing, this TV most likely had a power supply
failure a long time ago and was set aside. Ther is no reason to conclude without
some testing that the picture tube is dead.
The thing you are describing as a large blue diode with vents is most likely a selenium
rectifier for the power supply. Do a little research and you will find out that those
are prone to failure and are usually replaced by more modern silicon units.
Be very careful, but working on this TV should be a rewarding experience.
As someone else suggested, if you could post some extra info, it would help us
to help you. Things such as model number, list of tubes, etc.
The 21ALP4 picture tube type indicates that this is nominally a 21-inch TV.
Good luck, please do keep us posted.
Last edited by electroking; 09-09-2008 at 11:05 AM.
Reason: corrected spelling
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