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Toshiba smart tv; 50L4300U; two horizontal lines appear and the the focus is reduced when this happens. It happens every few seconds; what could cause this issue?
Frequently lose focus and lines appear on all stations and devices
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If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
T con board is responsible for digitizing picture info and what you see on screen. Any crazy items, distortion, are derived from there.
See if you can one on ebay - often the boards are parted out from other sets.
Sounds like back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/
Some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
this problem is caused by a faulty ir of cap's . First is c408 on the board it is a 100uf @ 35v i replaced with same uf and @ 50v , Second is a 2.2uf @250v and is c410 on the board replace both and your off to the races.
here's something you can try...remove the back and notice that there are ribbon cables (FRAGILE!) on the right and left side...alot of times these cables develope bad connections and cause the lines you see...other times the panel will be suspect. Removing these ribbon cables and reseating them have helped me determine in the past if it is a bad connection...or a bad panel
You need to consider the following tips herein as follow:
1) Field collapse (horizontal white line on screen) R710 dry joints. Same as C2146TN & C2546TN problem solved with thanks to Mike G & Barty. Power off/unplug. Get to circuit board underside with aerial socket up-R710 is near top and right of centre-cluster of 4 joints best resoldered
2) Picture is horizontally narrowed and deformed Capacitor C2913 (390nF, 250V) on the deflector PCB had lost capacity
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