Black horizontal lines across bottom 1/3 of screen
Model is 27GT271. Shows a band of distortion (scan lines spaced out) about 2" high at about 5/8 down screen, then picture is normal until about 4" from the bottom where distortion re-occurs all the way to the bottom.
Occasional, picture snaps back to normal for a brief period. But always eventually reverts to distortion pattern mentioned above.
Re: Black horizontal lines across bottom 1/3 of screen
This is due to vertical section failure. Change the vertical supply rectifier diode and supply filters. Then check zener diode leakage in pumpup circuit section. Also check any electrolytic capacitors leakage in vertical section. If it is old model tv change vertical height, vertical lenearity presets also. I hope given details useful to you.
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This is a failure in the vertical amp section. One way to troubleshoot it is to get a can of freeze spray and use it on the suspect components. The other way is to inspect all the solder joints on the amp. Last would be to check voltages on the board. Since it does change with run time, it is being affected by heat.
That problem is usually cause of faulty capacitors on the power supply board..
Just follow this instruction to fix your TV..
1. Open the back cover of your TV. 2. Look at the power supply board..Its normally connected to the power cord.. 3. After that,,try to look at the actual image of capacitors if it is bulged on the top so that you can easily determine the bad capacitors.. 4. After that,,try to replaced the bad capacitors using soldering iron and soldering lead..replaced the capacitors only with the same type ratings and value.. 5. Some of the capacitors not bulged so its better if have a capacitance meter
Yes, You are correct, it does not seem to be problem with the CCD. Insted it seems to be with shutter control or apparture control mechanism of the camera. Normaly there is one single cable carring signal to the shutter blade mechanism and the diaphram control. If this cable is damaged it shows the same symptoms as you have described in your mail. Get in touch with an expert camera repairer.