Question about Sony FD Trinitron WEGA KV-32HS510 32" TV

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Dark screen on all inputs, OSD clear

The screen was a little dark, despite the brite and contrast being all the way up. The OSD had no problem but any other input did. I turned the screen up enough on the flyback to see the retrace lines and turned it down till I could not see them anymore. This sent unit into overload protection mode and shut unit down. I am currently waiting the 4 hours for the hard reset to occur since I cannot see anything. Unit dooes not show any of the 9 service codes on the Timer LED when started or turned off. Could this be a bad flyback or the B board problem?

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Re: Dark screen on all inputs, OSD clear

Luminance is missing or the brightness. try to inspect the board at the back of the CRT see if there is an open resistor

Posted on Jan 15, 2007

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The screen becomes dark after I turn it on.

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This sounds like low screen voltage(A1)try adjusting the a1 voltage bottom control on flyback transformer if you have a voltmeter, voltage on crt base possible market screen or A1 shoud be beteen 350/500 volts when making adjustment remember to take into account current taken by meter If voaltage will not adjust flyback transformer will have to replaced

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I have a panasonic television that is very dark, the other colors are okay but when it goes to nights scenes, its very dark can this be repaired, the model number is ct-25G6E

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*The brightness control setting determines how bright your picture will be. *The contrast control sets the gain of the video circuit. This determines the difference between dark and light scenes. Low contrast settings make the picture "hazy". High contrast settings make the picture more distinction between dark and light scenes. *The sharpness control determine the frequency response of the video circiut. High sharpness settings give better resolution but also shows more noise in your picture. Lower sharpness settings smoothe out the picture removing noise but also fine detail. It needs to be set for the best all around picture. *Picture Enhancement is pre-set adjustments which give you different picture qualities. You just select the one you like. Stargazer

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2 Answers

Try # 2... Green Fog

The green gun in your picture tube is set a little too high. If you are experienced in removing the back cover of TV's,etc., you may try to find the drive and/or bias controls either on the circuit board that plugs on to the neck of the picture tube or mounted on the main circuit board of your TV. These controls are usually labeled. If you can find them, locate the green bias or drive control and back it down a little while watching the picture through a mirror. A slight adjustment may correct your problem.tJIS IS CALLED GRAY SCALE ADJUSTMENT. BE CAREFUL THERE ARE SOME HIGH VOLTAGE CIRCUITS NEARBY. WORK WITH ONE HAND AND USE AN INSULATED TOOL TO MAKE ADJUSTMENTS I hope this may help you.AGAIN BE CAREFUL!! Stargazer

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