Question about Toshiba 50H72 50" Rear Projection Television

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Picture (video) jumps from bright to dim

Picture will be nice and bright, then suddenly it dims, but not completely black. Basically too dim to watch. "Menu" callup presentation not affected - it does not dim when the picture dims. Tried reseating the video boards and connectors with no effect. Turning set on and off sometimes restores the bright picture, sometimes not. Problem occurs regardless of which input is used (cable, front A/V, rear A/V). Continuous watching never seems to restore the bright picture. Trying to analyze it with the Toshiba print is a nightmare.

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I figured it out myself. R243 was intermittently open. Replaced it, and now we can watch the Super Bowl.

Posted on Jan 29, 2009

  • Robert Hero Aug 22, 2013

    Where the Hell is R243 ??? Which board ?

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SAMSUNG TV HL-85687W picture is dim


(Please check your model number - it appears to be incorrect, I believe it's HL-S5687W)

1) How old is the lamp? (how many hours on it)
2) Is the lamp an original equipment lamp, or aftermarket?

It's either the Lamp itself (it's not common for a sudden reduction in brightness), -or- the Lamp Ballast has gone bad. This is the power source for the Lamp, and although they usually die completely when they do go, sometimes they will act just as you have described... they fail into a "low power" mode.

If the lamp IS an original mfr lamp, and if it's nowhere close to being near "end of life", then I'd say it's likely the Ballast.

Prices for the original Samsung lamp run around $100 onamazon and others.

The Ballast p/n BP47-00037A has a cost of around $50 to $100 online.

Google those p/n in "Shopping"

The Ballast can be replaced without great knowledge, but will require some dis-assembly, and CARE.

WARNING - Dangerous, and even lethal voltages are present inside your TV set. Do not attempt this unless you are trained in these kinds of repairs. Leave the TV unplugged for several hours (or preferably a full day) before attempting such repairs.

Jan 12, 2013 | Samsung HL Projection Televisions

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I have sony 50E200A,there is problem with colour combination/mixing....green colour is too bright.please tell me how to resolve this problem.thanks


You need to calibrate the colors

The first step in calibrating your television lies in paying attention to your surroundings. Sit in the same spot you'd normally sit in to watch your TV. Then, make sure the lighting is at the same level you'll be using to watch movies: setting your TV to overcompensate for a brightly-lit room may give you distorted results. Watching in complete darkness may cause undue eyestrain, but a dim, diffuse light behind or to the side of your LCD TV is best. Just make sure to avoid any glare or reflection on the screen.

Next, be sure your display has "warmed up" for at least a half hour before attempting any calibration; this is to ensure that all the components of the display are at normal operating temperature and best approximate normal viewing conditions. You can take this time to familiarize yourself with the various display controls on your particular TV--get the manual out if you have to. The better you know which controls are available on your LCD TV, the better your end results will be. Though different manufacturers give different names to the controls, these are the levels you'll be adjusting:

  1. Black Level, normally found on the Brightness control
  2. White Level, usually called Contrast or Picture
  3. Sharpness, or sometimes Detail
  4. Color Saturation, usually labeled Color, or maybe Chroma
  5. Color Tint, also known as Hue

Beyond these basic settings, many modern TVs come packed with so-called "picture enhancements" which in reality do nothing but spoil an otherwise accurate, lifelike picture. Take a moment to dig through your TVs menus and disable any of these "features." What you're looking for is anything labeled edge enhancement or detail enhancement, flesh tone or color "correction," etc. This is a broad generalization, but basically anything not listed in the five controls above can be safely turned off. Another thing to check for is often called a "Picture Mode," or something similar: in reviews, we often find best results from a Movie or Cinema mode, which usually gives the most accurate picture with the least "enhancement." A Normal mode is a safe bet when this isn't available, but definitely avoid anything called Vivid, Dynamic, or Sports mode.Sports mode may make the grass look nice and green, but unless you're watching The Masters, it's probably not that green in real life; Sports mode is just ruining the color.

On a similar note, have a look at the options available for your LCD TV's backlight settings. Like many of the settings, the backlight is probably set to its highest brightness, which is probably too bright for comfortable extended viewing, and shortens the lifespan of your LCD TV as well. Drop this setting down at least to it's "normal" value, or even try out the Low Power or Power Saver option if it's available (in dimly lit rooms).Finally, a word about Color Temperature. Without getting into the rather complicated science behind it all, Color Temperature basically refers to the peak wavelength of a light source, which affects the color tint given to images which should be "pure" white. Suffice it to say that while most video is produced to what's called a "6500K Standard," (6500 degrees Kelvin), not every TV comes out of the box set to display that standard properly. In fact, factory settings are very rarely are set close to 6500K.

Dec 12, 2010 | Sony Projection Televisions

1 Answer

The picture is almost hazy and is kinda dim. picture not bright??


have you tried to take off the front screen and clean the lens and mirrors yet? if this is a philips 9or a magnavox you will most likily need to change the fluid inside the picure tubes

May 08, 2010 | Projection Televisions

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IM A TV TECH. I HAVE A SONY LCD KP-60XBR800 I HAVE NO RASTER. POWER OK, MENU OK BUT NO RASTER ON TUNER, TUNER VOLTS OK,CAN YOU HELP ME PLEASE. THANKS my email sergioaguirre0182@hotmail.com


check the high voltage with the screen control turned up high where there is no raster. suspect problem within the video circuit where there is no high voltage or defective picture tube.some time when the screen is black and the screen control advanced,you can see if the tv has video or vertical or horizontal problems on the screen.service the high voltage circuit if there is no raster or high voltage is seen.no raster can be caused by the no heater or filament in the CRT.---- a defective picture tube can cause many problems, such as, poor brightness ,missing colors,intermittent picture,poor focus,a single-colored raster,arching in the gun assembly,retrace lines in the picture,negative picture,chassis shutdown,noheater or filament lit and no raster to name a few.an open filament or heater can cause no picture or no raster symptom.a defective CRT can have an extremely bright screen.loose particles of the cathode element can lodge between the grids and cause an intermittent black and white picture. simply tap the ends of the CRT gun assembly and notice if the picture begins to flash off and on.---- with a leaky picture tube after turn on the raster dims and get extremely bright.a dim picture with no green in the raster can result from a bad green assembly. a heater-to-cathode short can cause a raster to change colour or a result in no raster at all.replace the picture tube if there is severe arching in the neck of CRT. excessive brightness with retrace lines and a vertical collapse to a thin line can be caused by a bad coil on the neck board of the picture tube.rejuvenate the picture tube when there is very bright green screen. check for the resistance change on the resistors of the CRT neck board for an excessively bright picture with retrace lines.excessive dust inside the CRT spark gaps within the picture tube socket can cause the very bright raster and the chassis shutdown.a defective video amp,luminance buffer,or reference transistor can cause a bright picture with retrace lines. -------- for getting any required parts to replace you can get it from www.radioshack.com or from www.partstore.com or from www.shopjimmy.com --------- thanks.please do rate the solution.thank you for using fixya.keep updated.

Sep 06, 2009 | Projection Televisions

1 Answer

Replaced wd-62525 lamp, picture dim


Cleaning the mirrors will not increase the brightness much. I would double check the lamp setting in the Menu and also the setting of the picture and brightness settings. Many times these are adjustable independently for different inputs. Besides this, I would look at the Ballast and or the Power Supply to cause the problem. I would recommend a professional to look at it if it is not correctable from the Main Menu of the set.
Hope this helps,
Skyassoc

Jul 17, 2009 | Mitsubishi WD-62525 62" Rear Projection...

1 Answer

Best settings for moderate to low light viewing?


Using your remote, click the "video" button (mid area, Right hand side) and adjust the brightness, contrast, etc., to your liking. Only you know what you like. If your picture can be "plenty bright enough"...then just make the necessary adjusts to whatever looks best to you. If your picture is "very dim" no matter what the video settings are, you need a complete cleaning of all lens, mirrors, and screen...and possibly a new lamp.

Apr 16, 2009 | Mitsubishi WD-62525 62" Rear Projection...

1 Answer

Magnavox HDTV very dim


hi i have a philips 42 pfl5522d and need a new screen can you get me one..

Mar 16, 2009 | Philips Magnavox 50ML8105D 50" HDTV DLP TV

2 Answers

Screen is dim/dark picture


Time to replace your DLP lamp!  Expensive ($200 and up)!  Good luck!

Jul 31, 2008 | Sony Grand WEGA KDP-65WS550 65" Rear...

2 Answers

Dim picture


If decide to do yourself, ya only have to do the green and blue ones, the red light spectrum won't allow fungal growth. Pull whole CRT assembly out to prevent spilled/leaking glycol from onto lower main boards

Sep 04, 2007 | Philips Magnavox 51MP392H Rear Projection...

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