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Crown ctt3207w dark picture

I have checked the back lights they are all lit but the pic is on just visible with the brightness etc all turned up full does anyone have any idea what could be causing this problem i am having trouble getting a service manual for this set

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On the driver board below the power board check the fuses one of mine had blown

Posted on Jun 12, 2010

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Crown ctt3207w LCD TV won't recognize the PC source anymore


I would check the cables inside the unit. One of them could have come loose during the move.

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Please try reducing the contrast a little and increasing the brightness till the dark shots are clear. Please also check the back light setting. It should not be too low.This should make all the dark scenes clearly visible if it only a setting problem. In case the overall brightness has reduced, please consult a local TV Tech.

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Have you checked all the back lights. If not check it. Replace the faulty ones. If you wish to get some details, check the site linked here. Pull up older posts. Check the site in 'Mosaic' view. It will make search easy. http://electronicshelponline.blogspot.com/

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The best picture settings depend on several factors, including personal preference and lighting conditions. Are you watching in a brightly lit room or in the dark? If there is light, is it coming from behind you or from one side? Or from above?

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1 Answer

I have 20 inches tv there is a sound but no picture,it so dark picture


Since you say dark picture visible, then : Brightness control setting!

Check the resistors on the neck PCB. If you find the resistance value of these resistors high, replace them.

If No EHT is found then also there won't be a picture visibility.

1. Open the back cover and see whether you can observe a faint filament glow in the picture tube neck, close to the picture tube socket.
If there is no glow E H T circuit failure.

2. If the glow is observed check picture tube grid voltages grid no. 2. as said above.

( the points referred above are all for technical people)

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1 Answer

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check the heater voltage (H) of Flyback to display tube (CRT) is available, or check the parts 'resistors' = (0.5 to 1 Ohm), through which the voltage. confirm whether burned or not connected. or the easiest is to see the back end of the CRT tube, whether such bright lights? when lit it indicates there is voltage to the heater.

When lit, you try to turn and raise the "Screen Adjustment" on the Flyback Transformer (FBT) near/under " FOCUS Adjustment ". your TV screen light will grow brighter as rotated to the right / upgraded. image will appear visible on the screen, but not too bright.

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1 Answer

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