TV picture rolls on AV input, but picture fine at RF input
Colour TV ( BPL LVR-20) was working fine until the day it's HT transformer went faulty due to high voltage on power line. I got it repaired and the TV is working fine on RF input but whe i try to connect DVD player or any other device through AV input of the TV set the picture is rolling vericaly (picture slanting /_/ ) audio is ok. the same DVD player worked fine earlier. hope if someone can help.
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Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
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Probably not. Better picture results are achieved with either S-Video, standard RCA AV cable (yellow-white-red), or YUV component cable (red-green-blue) (component output does not have audio - this requires extra cable to be connected). The video via either one of these 'AV' connections is stunning (based on a standard 16:9 LCD TV using a Panasonic DVD recorder).
RF tends to be lower quality - as opposed to AV/digital input. AV input/YUV component handles digital better. No one connects their DVD devices to their TV via RF (either directly to the antenna socket or with a modulator/attenuator) anyway. Because a VCR is mostly analogue, it will work fine with an RF connection, but DVD is digital, and so won't work as well, if at all.
RF also goes through the tuner in a TV, creating cross-interference, whereas AV is a direct input and is separate to the tuner.
I would say an RF modulator would not be designed to handle the output frequency that your DVD device generates. Throw the modulator out, or perhaps get another TV, or use RCA cables instead if the TV has AV inputs. Whichever is cheaper and easier, but don't use RF accessories except a standard antenna if/as required.
It could be due to the wii's current video settings, the previous owner would have had a TV that ran on different viewing options. The black and white picture is caused by having the Wii settings output at PAL 60Hz and the TV input at PAL 50Hz or vice versa (or NTSC). Try going to the wii settings menu and try a couple of different video settings until the colour comes :). If this does not work can you please post what connection you are using for ex. AV or composite.
The yellow must go to the video and the sound L&R to the audio inputs. If there is no video after selection of the AV, then it is possible that the input video amplifier is faulty. If there is a second AV2 port then use it or else you might need a modulator to connecct vis the RF input.
Other wise the set must be opened to check for failure off the video amp, protection diode at the input.
Me too! Apparently Diboss are no longer trading, so no help there. I am aware that these panels have a common power supply issue, the faulty chip is only available from China and the last one I fitted only lastest a couple of days. However the fault described above is not the same. I've checked the psu outputs; all are fine and nothing changes when the picture disappears, therefore I can assume that I'm not looking at a PSU fault. As Iain says above, it appears to be a signal link, however I have no picture on ANY input and without circuit diagrams I cannot find any component that's common to all the various inputs. This leads me to think that either the backlight, or the screen itself is faulty. I'll keep trying and if I get it sorted I will report back.