When I view an image that suddenly cuts from dark to very bright, the TV seems to "limit" the brightness after a split second and the once bright image becomes noticably less so.
This can be fixed by drastically lowering the "picture" setting on the TV, but that muddies the rest of the images.
Does this TV have some kind of superwhite limiter or something? Its very noticeable and quite annoying.
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Re: JVC AV-27530 Sudden changes in brightness
This sudden changes in brightness are caused by the change in voltage inside the tv,not in the outlet in the wall but inside the set,The changes are an indication something is going wrong and it needs to be corrected,the set does have a brightness limiter but it only works when the set wants to get brighter than normal,You need the assitance of a servicer to correct this problem.
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I have the AV-27S33 model and in the rear to the right of the inputs are two slits and inside these slits are two screws. The top screw is the focus,the bottom the brightness.Your tv is a different model but it may have this same adjustment,if it does try turning the bottom screw to the right to increase the brightness.
My jvc 27" tv was so dark I could hardly see any night scenes, even with the bright all the way on. If you push the sleep button, let go, then hold down the video and display (together), the service menu will come on. Scroll down to #7 (too dark) and adjust the brightness there. Works immediately. Good luck.
How many years is your TV now? Usually TV has its life span, there comes a time that it happens. And need to look for a technicians, cause some of theme can still be repair by adjusting the brightness inside your TV.
In my case, the adjustment was available from outside the TV. Sortof.
On the rear of the TVabout 2 inches to the right of the coax in, there
are two vertical slits on a little protrusion. Inside the slits are the
two adjustment screws. The lower screw adjusts brightness, the upper
screw adjusts focus.
Roger, if your contrast (sometimes called picture) and brightness controls are at max you can increase the tubes brightness by turning the "screen control" clockwise, be advised a little turn goes a long ways, don`t crank it too far or you will get retrace lines, you will have to remove the back from the set and follow the red wire down from the tube to the "flyback transformer" on the front of the flyback are 2 controls, focus and screen, do not move the focus control, this should fix your problem.
Yes you could look for the capacitor that is leaky, probably in the 200v line, or you could just open back and turn up G2 screen control on the Flyback. You have Screen and Focus on this black transformer with a long anode lead going to the picture tube of set. Becareful, High Voltage!
To answer your question nothing is going to drop inside the set,I also need to tell you that a cleaning of the inside is not going to correct the problem,you should get at least the opinion of a servicer to determine if the set is repairable or not,an experianced techician should have a very good idea as soon as he sees the picture,if he sees the need to remove the back cover that will be a good time for you to see if it needs cleaning,Be safe and get an estimate.