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Re: Poor picture quality
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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It sounds that the main power supply section to your TV has the fault. The horizontal thik lines that appears crawling down across the screen should be of video 'HUM'. Have you replaced the main filter capacitor at the power supply section? If not, replace it along with the main rectifier. The AC power is rectifed by a bridge and applied ot this main filter capcitor. It will have a capacitance value between 120 to 350MFD 450VDC. Check this section. Measure the rectifed DC voltage acorss this main filter capacitor. It should be around 350VDC, if your home power supply line is 220VAC. If it is 110AC, this DC voltage will be around 165VDC; and it should be. If rectified DC voltage found lower than the input AC voltage, replace the rectifier bridge. In some sets, this bridge section have four diodes. Some other circuits, a bridge rectifier stalk may be used.
I too would like to know the solution to this question...we are having the identical problem and Sony doesn't seem to know how to fix it. Although, the picture from the DVD player is perfect, the pictures for cable & video games are terrible. Very frustrating!
hi, Is there is white horizontal thine line on all over the screen then the screen voltage of you TV is high. Can be caused by bad base socket in the picture tube neck, faulty focus/screen block. Check the two things. You can see the base socket at the picture tube neck replace all the three base sockets for the three CRTs. if problem remains then you have to replace the focus/screen block. focus/screen block is one through which you can adjust the screen voltage and focus voltage. If the potentiometer in side it have some problem then this problem can occur. Have added the image for two items for your reference.
THI IS THE INTERNAL CIRCUTRY FAULT BEST YOU
call the service person and dont try to open it other than in side of TV SET HAVING Hazard of electrical shock be handle most care fully .
and check video board and all.
whenever you see horizontal line please reduce brightness of your tv for safety of crt.
your problem in vertical section only mostly due to loose contact in
connector,print or loose components.
TRY ADJUSTING THE SCREEN CONTROL ADJUSTMENT AT THE BOTTOM OF THE FLYBACK TRANSFORMER.THIS SHOULD REMOVE THE RETRACE LINES AND ANJUST THE HASY LOOK TO THE PICTURE IF NOT YOU HAVE A BAD CAP IN THE SCREEN CIRCUIT .LOOK FOR A 10MFD/250V CAP IF FEEDS THE NECK BOARD ATTACHED TO THE PICTURE TUBE 200V DC.