Question about Jensen Q2749J 27" TV

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Picture problem The picture is very dark...seems to flash/vibrate...? tube problem

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Usualy this is a power supply, or video processing fault, or CRT bias circuit fault. The set has to be properly troubleshooted to determine the fault.

Jerry G.

Posted on Apr 19, 2008

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My tv screen is to dark how do I lighten the picture


If your TV has already fully adjusted in brightness set up?, and there will be no good picture results?...try to adjust the "SCREEN-Screw" at the flyback slowly. If the picture still dark'?. the picture tube has need to rejuvenate.

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I have an old Orion TV134R . The picture is so dark on it that I need night-vision goggles to watch it . How can I brighten it up? I don't have the original remote control. Thank you.


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Dark display - sony trinitron kv27ts27


In the Sony TV a dark display is generally a bad picture tube. I have seen many of these and thought I could correct it with a deflection repair. I would next put the main board in another TV and saw that the board was just fine.The TV had a good picture.You can bet you have a picture tube that is bad!

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Picture's too dark no matter how much i turn the contrast or picture up its still too dark


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1 Answer

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1 Answer

Picture is dark


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

Feb 14, 2008 | Zenith C27A24T 27" TV

1 Answer

Sanyo ds31590 picture's very dark and red


sounds to me that your picture tube needs rejuvenated.
You will need to get it done by a tech.
mechanical doesn't mean a thing when it comes to electronics.
Mechanics when working on electronics, end up costing more damage when you end up taking it to a tech.

Oct 23, 2007 | Sanyo DS31590 31" TV

1 Answer

Tv Flashes


key2life316,
Your TV has a bad picture tube = no reasonable repair possible......time to go shopping!....................T.

Guest,
Your TV has a bad pix tube + a blown power supply!!
Time to move on ........T.

Aug 25, 2007 | Sony KV-35S42 35" TV

2 Answers

Picture is dark


Does not seem like a bad tube alone. Could also be that the Video output Transistors Supply Filter capacitor having dried out. It is a 100mfd 160V capacitor, which on replacement will improve the brightness of the immage. And yes, you could also try increasing the heater voltage (Filament Voltage)of the Pictuire tube, this will definitely increase brightness, but will reduce the life of the Picture tube. You gotta think - 10 year old TV, should I repair or exchange and get a new one???

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1 Answer

Dark picture


How old is the TV? More than 6-7 yrs? Then it's time to do a trade in. But if you are very attached to it, get a Technician to recondition the Picture Tube. This may give it life for another couple of years. You could also ask a technician to check the DC filter Capacitor for the HT line to the Video Drive circuits. Over time this capacitor dries out and also causes a darkening of the picture. It is normaslly a 100 mfd 160V capacitor.

Sep 08, 2006 | JVC AV-27D303 27" TV

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