Sounds like The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
SOURCE: No sound on some channels
Hi,
Check in the menu to see if the audio is on SAP. If it is change it to Stereo. Hope this helps
SOURCE: Have no volume on only one channel on Panasonic TH-42PX60U
Try the SAP - same thing happened to me and had to cycle through the audio tracks to get audio back on for that one channel. Good Luck!!!
SOURCE: I have had my 40 inch Samsung LCD for
I have come across that problem about 8 times in the past, only solution to your problem is to have the main board replaced.
SOURCE: no digital yet tried to retune but greyed out.
Just got through to Samsung support. Turns out the freeview card had frozen and needed a reset. To do this put tv on standby. then press in serries these buttons on the remote: 'info' 'menu' 'mute' 'power' TV will then turn on with a default screen. Press 'arrow down' button untill you reach option 12 'reset' . then push the 'right arrow' and tv will reset and start in plug and play mode and commence a scan when you've set the time. Just retuned mine and its back to normal. Hoorah!!! :-)
SOURCE: Panasonic TH-50PZ80U tv, error- 2 blinks
1. Reseating the connector P25 may solve the problem. If it does not.
2. Unplug the unit andd disconnect the connectors A5, A6, and A7. Apply power to the TV. If a White screen comes up and all voltages check normal, replace the P board.
3. If the TV stays on after isolating the SC board, then replace the SC board and the D board; it is likely that the fuse on the D board is blown.
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