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Try to adjust the screen voltage a little up. It sounds that either screen voltage has been gone low, or the sub brightness setting have some fault in circuit. See the screen control adjustment potmeter. It is Attached with line output transofrmer shown above. There will be to adjustment potmeaters, marked as 'screen' and 'focus'. Adjust the screen, the lower one, to a little bit, and try.
the problem is with horizontal driver transfomer...or 140 volt supply may be having a loose contact, or if any loose contact in vertical section it may happen,,,plz contact a service pro... u can not do it urself..
This model uses a flat screen picture tube, and it could be that it is normal for the tube to take that long to warm up. It is also why the set is rather heavy. If you are able to return it, however -- I would opt for a "name brand" set that can at least be repaired when it breaks down. Check out consumer reports December issue for suggestions.