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TV Tech1
TV Tech1, Technician
Category: TV
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Experience:  30 Years experience. Authorized Warranty servicer.
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my sony rear projection tv picture gets dark after being on

Resolved Question:

my sony rear projection tv picture gets dark after being on 5 min
Submitted: 6 years ago.
Category: TV
Expert:  TV Tech1 replied 6 years ago.

I have had some issues with bad solder connections on the picture tube's heater circuits, located on the High Voltage transformer section. In most cases, if you live in a larger town/city, TV Techs will generally just do a job like that for $100 to $150 at most.


It's kind of a fast/easy fix for us. It gets much more complicated for the average Joe though.


That symptom you described where the picture gets darker after 5 minutes is due to the solder connections being cracked, and as the TV warms up they pull apart; your TV's heaters cool down you get less output from the picture tubes and once the connections cool down, they re-establish their connections and your picture gets brighter and the vicious cycle starts all over again.


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Thank you.



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