Hi Guys,
I've been given another of these cheap LCD TVs, which basically works, but has some problems.
The main problem is that the set states that there is 'No Signal' when DTV (Digital Tuner) is selected, despite the fact that my digital signal is very good (works fine & shows good levels on my main TV and DigiBox). DTV Tuning cannot be selected in the menus (it skips this option), so it's impossible to do a channel search. However, Analogue tuning works; it can be selected and searched OK, but, for obvious reasons, does not find anything. Pressing a channel no. while in DTV (1, 101 etc.) brings up a channel description bar with the channel name, but again, the signal level is shown as zero. Anybody got any idea how digital tuner switching is done - is this likely to be the Tuner/Main Board, or maybe the IF Board that's at fault?
Another problem is that the brightness is low, but this seems to be normal for these sets, as the last one I had was exactly the same. High brightness scenes look OK, but low brightness scenes are very dark. The Inverters and backlight can be seen to be working. Brightness is set to 100%, but going above 65% actually has little or no effect. Adjusting the Contrast level up/down does not help either. Although I've included some photos (100% brightness), it's very hard to show the true brightness level, as the camera tends to compensate for this.
Anybody got any ideas, know a way to reset one of these to Factory Defaults, or got a Circuit Diagram? Any help would be much appreciated. Thanks.
I've been given another of these cheap LCD TVs, which basically works, but has some problems.
The main problem is that the set states that there is 'No Signal' when DTV (Digital Tuner) is selected, despite the fact that my digital signal is very good (works fine & shows good levels on my main TV and DigiBox). DTV Tuning cannot be selected in the menus (it skips this option), so it's impossible to do a channel search. However, Analogue tuning works; it can be selected and searched OK, but, for obvious reasons, does not find anything. Pressing a channel no. while in DTV (1, 101 etc.) brings up a channel description bar with the channel name, but again, the signal level is shown as zero. Anybody got any idea how digital tuner switching is done - is this likely to be the Tuner/Main Board, or maybe the IF Board that's at fault?
Another problem is that the brightness is low, but this seems to be normal for these sets, as the last one I had was exactly the same. High brightness scenes look OK, but low brightness scenes are very dark. The Inverters and backlight can be seen to be working. Brightness is set to 100%, but going above 65% actually has little or no effect. Adjusting the Contrast level up/down does not help either. Although I've included some photos (100% brightness), it's very hard to show the true brightness level, as the camera tends to compensate for this.
Anybody got any ideas, know a way to reset one of these to Factory Defaults, or got a Circuit Diagram? Any help would be much appreciated. Thanks.
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