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Aiwa tv 21 219

KSuddenly my tv picture became dim even after keeping brightness and contrast full.Local mechanic told that picture tube had become old and weak it couldnot be made better.He made a bit better but not ok. Please help.Saroj

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  • Daewoo Master
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If CRT is weak, it should be replaced. There is no repair to it.
Gopakumar Gopalan Google

Posted on Apr 14, 2014

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: help....all the characters on tv are green

Hi. When TV has one color only, Unplug CRT Socket. if voltages for cathodes within 10% of each other, Problem is with CRT. check green video amp on crt socket, it may be shorted or leaky, if ok have crt checked for short involving the green cathode.

Posted on Mar 20, 2006

TVtechmaniac
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SOURCE: The picture on my JVC TV is too dark

On the inside of the TV, on the flyback transformer there should be two controls. Turn the one that says "screen" very slowly clockwise while looking at the pix. The pix should get brighter as you turn it up- if you go to far you will see lines in the pix or the TV may shutdown.

Posted on Aug 30, 2007

  • 579 Answers

SOURCE: Tube TV - one thin horizontal line of bright light

Vertical defection failure. Common failure. Pretty easy to repair ($50-75?). However, my general rule of thumb is not to waste any more money on TVs over 10 years old. Too much other stuff in there ready to fail as well.

Posted on Jan 24, 2008

  • 275 Answers

SOURCE: Hitachi Ultravision Digital TV dark picture

Looks like

1. A Cold solder in the Video Output stage power supply.

2. A bad Electrolytic Capacitor in the above Video Output stage.

I generally do not waste time in attempting to locate faulty capacitors. There will be only 6-8 pf them in the above stage / section,m and the klot of them would collectivelyt not cost more than 3-4 $ equivalent, in india. Just blindly replace the lot, and the set is ready in 30 mins.

Dunno how much they will cost in your country. Try to look for a 100mfd, 160V Capacitor. Close your eyes and replace. generally does the trick.

Posted on Apr 09, 2008

  • 30 Answers

SOURCE: old tv only shows half picture

it looks like some caps are bad in the set.
Have it serviced by a TV repair shop

Posted on Aug 03, 2008

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Mitsubishi TV 65 inch rear projection. WS 65809 I went thru the convergence ic chip replacement years ago. Love the TV. My problem now is that the brightness goes from full bright to full dim then...


The old Mitsubishi units had a super capacitor in the logic circuit instead of a backup battery. This capacitor became leaky over time, causing the problem you describe among others. Number one symptom is set has audio and dark or black picture when powered up. As the super cap charges to full voltage, picture comes and goes.

Nov 27, 2014 | Televison & Video

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Why LCD TV have No Picture only sound


Flat-panel LCD TVs have a lifespan newly approaching 100,000 hours on average. The lifespan of an LCD TV is generally longer than that of similar-sized plasma televisions. Some manufacturers even claim that their LCDs can last upwards of 100,000 hours when used continuously under controlled conditions (e.g., in a room with "standard" lighting conditions and 77&deg; temperatures throughout). Just how realistic such claims are is debatable. After all, whose living room has no windows and remains at a perfectly comfortable 77 degrees year-round? <br /> In any case, the pictures on fluorescent backlit LCD TVs will show some "wear" because they are generated by powerful lamps, which, like any lighting appliance, will dim over time and with use. The picture you see will dim ever so slightly as the backlighting bulbs dim. One other consideration is that CFL fluorescent backlighting will change colors over time. This will change the white balance on your TV and cause color calibrations to be thrown off. <br /> Therefore, the most important thing to consider when it comes to the lifespan of your LCD TV is the actual lifespan of the light source in your LCD. LCD TVs last as long as their lightsources do. So, the lightsource in your LCD TV is the critical component of your LCD display unit. Newly introduced LED backlit LCD TVs will have the best long term performance. LED backlighting is superior in that the white balance of the TV will not be affected by changing bulb color over time. It's a more consistent bulb technology and will also maintain its brightness longer. <br /> The edge lit version of LED TVs will use far less energy while local dimming LED backlighting will be more accurate and present a better picture while using more power. We believe that local dimming LED backlighting will be slightly less stable from a life span standpoint. <br /> To ensure the integrity of your lightsource for the duration of your LCD display's lifespan, you will definitely want to adjust the CONTRAST setting of your LCD TV. Too high of a CONTRAST level will prematurely age your lightsource because it will have to work harder to maintain such light intensities. Your best bet is to keep your CONTRAST set appropriately for the conditions under which your view your LCD display. Brighter ambient light levels require slightly higher CONTRAST levels, while lower ambient light levels demand less CONTRAST <br /> If there is sound but no picture, only sound it has more chances of faulty back light repairable from Service Support. <br /> Hope this helps, if so do rate the solution. <br />

on Jan 08, 2011 | Sony BRAVIA KDL-40S2010 40 in. LCD...

1 Answer

I have an old Sharp flat-tube tv. The picture is bad, it's very dim even though the brightness setting is all the way up.


If the "contrast" is also turned up, then, the tube is toast and needs replacement. A local repair shop can quote you so you can determine if it's cheaper to purchase a new t.v. or not.

May 09, 2014 | Sharp Televison & Video

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Proscan 37lb30qd


This could be one of two things. The backlight is dimming. There are tube lights in the unit and they slowly burn out. The way to tell is if the picture turns a shade of orange slowly comes on to full brightness. It could also be the inverter. The inverter is the board that powers those lights.

Jul 14, 2013 | Televison & Video

1 Answer

Tv dims after turn on


is the auto contrast on? If room is bright it will dim to compensate for brightness.

May 26, 2012 | Panasonic TCP50UT50 Smart Viera 50 Class...

1 Answer

MY TV PICTURE HAS GONE A LITTLE DARKER AND ADJUSTING BRIGHT, CONTRAST, COLOR,ETC. DOES NOT HELP


How long u have this RCA analoge tv?Around 10 years or more and used it like about 5 or 6 hrs everydays?Yes,than ur tv it is losing CRT tube radiation cohetion.As times go bye years in years out the tv CRT-(tv tube) radiation will slowly dying out,Tv actual pictures will lost some of it luster and it brightnesses to the tv auctual pictures.Brightnesses of CRT tube will get darker and darker until the tv actual pictures barely it is watchable anymore.Contrast,Brightness and Colors adjusting more will help some.But u have to take this tv aparts and take a Flat scerw driver turn up a little bit more of the tv HV-(high voltage) SCREEN button on the FBT-(flyback transformer) to make any big differences of the CRT tube brightnesses.The FBT-(flyback tranformer) is the big block of plastic with a red wire with a black cap hook up to the tv CRT-(tv tube).This adjustment on of the FBT,HV-SCREEN button will help the tv CRT-(tv tube) last another year or two.

Aug 16, 2011 | RCA TruFlat 27F520T 27" TV

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Dark picture on wega lcd


Yes, if this TV has a bulb it is likely to be the bulb.

I am not familiar with this exact model, but other LCD Projection TV will show dim picture after some time. Expected life of the lamps is about 2yrs. After 2yrs the picture will become dim. After 5yrs I am suprised it is even working.

Dirt doesn't cause this problem unless your are a smoker or have the unit "literally" outside. DO NOT try to clean it or let someone tell you to do it because it will cause more problems than it fixes.

May 07, 2009 | Sony Grand WEGA KF-42SX300 42" LCD TV

1 Answer

Colors (tube tv) periodically become bright and flicker


this sounds like one of the tubes is shorting out ,or have you or do you know if your tv tubes have been serviced and the fluid checked in them reciently.i know sone tv proj carries some kind of solution in the tubes to keep them running cool ,call a service rep or the panasonic co and ask them tech support

Apr 16, 2009 | Televison & Video

1 Answer

Picture to wide


This trouble symptom picture wide or"blooming", the picture becomes dim even with the brightness control full on,and there is an abnormal enlargement of picture or raster.Usually,the enlargement is uniform,but there may be some defocusing.In some circuits,the brightness control operatesin reverse(rotating the control for an increase in brightness produces a decrease) after reaching a critical point on the control. If the picture wide is not accompanied by insufficient width(a symptom of horizontal output failure) the probable cause is a high volatge circuit ony,particularly the HV rectifier and HV winding.Any circuit problem that reduces but does not completely eliminate the high-voltage output to the picture tube second anode can cause overscan. The most likely defects are leaking high-voltage capacitors,defective high voltge tube rectifiers,leaking high voltage leads,defects in high voltage circuit protective resistance,and shorted turns in high voltage winding of the flyback transformer.

Hope this may help you;

DON'T FORGET TO RATE:

Regards,

Sep 06, 2008 | Toshiba 32AF45 32" TV

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