Question about Zenith H36F46DT 36" TV

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Picture is dark

WE can not brighten up the picture - shows with dark back ground is very hard to see.

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Re: picture is dark

Your set may need to have a screen control adjustment. This adjustment is on the high voltage transformer and the back cover will have to be removed a access it. I'm assuming that your set has a picture tube in it- not a plasma or LCD display. If this is the case you can remove the back cover and adjust this control while observing the picture being shown. If you adjust it too high you'll get retrace lines (fine lines going accross the screen). If you're not comfortable doing this or inexperienced, you might want to get a technician to adjust it for you. There are dangerous voltages inside! Stargazer

Posted on Apr 23, 2007

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Check the bulb and ballast board. Contact any service technician.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.

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If you are comfortable working inside the set, I can suggest the following:

1) Open up the back and locate the flyback transformer (part with large red wire coming out the top). There should be 2 adjustment posts on the back of it.

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sitnlisten - yes it does appear your pix tube is getting weak,but we may be able to turn up the flyback alittle to brighten up the picture.If you take the back off you will see the flyback-large black unit with a wire going to the round rubber cap on the back of the pix tube.Look at the flyback there are usually 2 adjusters one marked focus the other screen,just turn up the screen a little bit at a time.If you turn this up too much you will wind up with retrace lines on the screen.You may also want to check the pcboard ass'y for a sub bright adjust,and same thing small adjustments.If this don't help your pix tube may be too far gone.I hope this helps. cooltek Feb.1/08

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Hi This could be one of three possibilities, one the High Voltage Screen Adjustment is off, Two the Picture Tube is Weak, or Three there is a problem with the Video Drive Amp/Amps, these are things that should be checked or adjusted by a qualified technician, especially the High Voltage Screen Adjustment, hope this helps.

Apr 15, 2007 | Zenith H36F46DT 36" TV

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