Beovision 3 (8803) standby ok - no picture - no sound

Have you tried a factory reset? I had a similar problem my TV was stuck on standby (red light only) I did this

1. Turn on the TV.
2. Wait approximately 40 seconds for the TV to completely start up.
3. On the TV remote control, press and hold the UP ARROW button

and it worked!

ok sir you have defective power supply at hot side section! and the power oscillstion circuit! your unit need to diagnos to know the exact defective parts!

hi this fault could be down to capacitor in the power supply, they bulge or go leaky, you need to take the back off the tv, to have a look. try and find a tv tech in your area hope it helps

regards
shaun

It will be best to contact any service technician, rather than do more.

Same issue with - Panasonic TH-50PX70A , power UP with red standby, then power ON by remote - only Gives GREEN led blinking 35-40 times, followed by solid green led with no no picture no sound.
>> Solution; unplug Plasma from AC 10-15min, then plug in & power on to Red standby led,, At this point - Power ON tv while holding down both -Volume Down and F (function Select) buttons (front panel door) at the same time turns picture ON,all ok.

the high voltage or flyback transformer is not working.the sound runs off a separate fixed power supply.if you run your hand across the screen,is there static?that would mean the high voltage is ok but there is another circuit fault

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. Pull up older posts.
http://electronicshelponline.blogspot.com/ Type in this key phrase " my service table today " in the search box at the top right of the the home page, to get gathered some pages which has the details of practical experiences of the author of that site. The search result might display about 20 Nos of related posts. Press the "All posts" at the bottom of the list, then you can select them one by one.

Unplug the TV for maybe 10 minutes, then turn it on. Sometimes these units simply need to recycle. If that doesn't work, you've likely got serious problems.

projection bulb needs replacement

vertical red line on screen - I have a Hitachi plasma 42HDs69