There are several things that could be the problem, as usual. However I did manage to get a set working with the following characteristics:
- Set powered on ok and displayed the Acer logo fine.
- All of the inputs had very low brightness and poor colour.
- The backlight was working and appeared bright.
- The picture was barely usable with brightness/contrast set maximum.
I figured the issue here was a loss of the picture settings in the eeprom in the unit. So I set about to find how to get to the factory menu to set these things. This assumes you can get a menu to display on the set.
To enter factory mode on the remote control press menu/menu/234/menu. You will see the menu displayed with some info in the top bar that is normally not shown.
Then on the front of the TV press Volume- and Channel+ at the same time and hold until the factory menu appears.
You may see that the RGB gain and bias values are low or 0.
If that is the case set the colour temperature mode to Standard and then adjust the RGB gain and bias values to the following:
R gain: 434
G gain: 482
B gain: 484
R bias: 270
G bias: 270
B bias: 264
Then set the colour temperature to Cold and enter the following values:
R gain: 434
G gain: 482
B gain: 484
R bias: 270
G bias: 300
B bias: 310
Similarly, for Warm adjust the values to:
R gain: 434
G gain: 482
B gain: 484
R bias: 300
G bias: 280
B bias: 264
Then, if this was the problem, the picture should be fairly adequate.
Hope this works for you...
BTW I must give some credit here to another poster who provided a similar solution to a different problem here:
http://www.fixya.com/support/t154524-tv_losing_its_channel_memory
Hey guys Im in Australia and was given one of these flat screens but the previous owner played with the settings for RBG gain and bias. SO hence a bad picture. Ive tried the settings suggested but on this model they only go up to 255 for each . Any help would be greatly appreciated. Cheers Dave
Craig here again.
I should add to this that there is a set of parameters for each of the video sources that the TV has, and that will be the input source that is selected before you enter the factory menu. You will probably need to adjust all of the input sources when you reprogram the TV. Some of the modes have settings that go only to 255, in which case I generally set them to 127 for half-range to start. I recall that the source that you are adjusting will be indicated in the banner at the top of the factory menu.
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