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Old 07-04-2014, 08:43 AM   #1
MayorOfBBQ OP
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Joined: May 2014
Location: ASHEVILLE
Oddometer: 242
Quick question about flat screen tv

I got a free cheap Sansui LCD from work as an incentive for hitting some numbers

It's not the best but it's bigger than my old one and it was free

Can one of you AV experts tell me why this tv gets brighter when I push the volume button and the bar pops up??

The tv get quite a bit brighter for a second.. Then dims again as the volume bar disappears from the screen?

I have adjusted brightness, contrast, sharpness but it seems generally too dim EXCEPT when adjusting the volume?

I have even found myself even running the volume up and down during dark scenes of dim shoes like GoT

And info?


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Old 07-04-2014, 01:04 PM   #2
Oldenuftaknowbetter
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Joined: Nov 2013
Location: Fresno, CA
Oddometer: 137
Quote:
Originally Posted by MayorOfBBQ View Post
I got a free cheap Sansui LCD from work as an incentive for hitting some numbers

It's not the best but it's bigger than my old one and it was free

Can one of you AV experts tell me why this tv gets brighter when I push the volume button and the bar pops up??

The tv get quite a bit brighter for a second.. Then dims again as the volume bar disappears from the screen?

I have adjusted brightness, contrast, sharpness but it seems generally too dim EXCEPT when adjusting the volume?

I have even found myself even running the volume up and down during dark scenes of dim shoes like GoT

And info?


Sent from my iPhone using Tapatalk
Most LCD sets have a "Backlight" adjustment, this and "Contrast" will brighten the picture. "Brightness" is actually black level, turning it up will wash out dark parts of the picture, turning it down too far will crush blacks, so you lose detail in dark parts of the screen.

Each pixel on an LCD is actually a filter that allows light from the backlight to pass through in different colors and degrees of brightness. Black is achieved by blocking light from the backlight, something no LCD panel can do completely. For this reason most all LCD sets have a circuit that analyzes the incoming picture and automatically dims the backlighting during dark scenes to improve black levels. This "auto contrast" may be what's causing the set's light output to increase when the volume graphic is overlaid on your screen.

Look for adjustments for the backlight and some means of controlling that auto contrast feature. If blacks look gray turn down the brightness until you just start to lose detail in dark scenes.

Also be aware that a set advertised as just "LCD" uses cold cathode fluorescent arrays behind the LCD panel. Sets advertised as LED still use an LCD panel, but use LEDs to light up the panel.
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