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Re: PICTURE DARK
I had the same problem soI decided to go ask at our local tv shop Panasonic warranty place and he was nice enough to tell me the problem .
So for everyone reading .. these had a defect with some of the disc
capacitors they used on the CRT board it as 2 on there .
The second problem is with the ``YC`` chip . panasonic sets have many unusuall malfunctions caused by this chip such as a black & white picture or brightness problems . unfortunatly my set has a bad chip .
There we all learned something today . he invites you to contact a
Panasonic ``rep`` he will tell you the same thing .
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Try to adjust the screen voltage a little up. It sounds that either screen voltage has been gone low, or the sub brightness setting have some fault in circuit. See the screen control adjustment potmeter. It is Attached with line output transofrmer shown above. There will be to adjustment potmeaters, marked as 'screen' and 'focus'. Adjust the screen, the lower one, to a little bit, and try.
Turn the brightness up slightly and turn the contrast on the highest setting. There may also be settings to control wether your projectin on a wall or on a screen. Make sure these settings are correct to your setup.
If it is dark because of an adjustment the "picture" adjustment would make a difference.
The most likely cause of a dark picture on this type of set would be the lamp getting near the end of it's life. This set should use part number, A-1606-034-B and is something you can probably change yourself, check your owners manual, it shows how. Follow the instructions and remember to have the power chord unplugged while you are changing lamp and to put the lamp door back on the set before you connect the power chord again.
Depending on the age of the TV, it might be power supply related. Check Mains smoothing cap or others in the area. Video circuit is also a possibility. Tube would be the last option to look into depending on the age of the set, Good luck,JUS004
This RCA set uses the CTC187BD chassis. Look on the back of the set and to the right of the cable connector you will see 2 controls sticking out, one on top of the other. The top control is for focus and the bottom one is screen, or overall brightness. If these controls have been turned clockwise then you will have a bright, fuzzy picture with white lines (retrace lines) through it. Tune in a channel with white letters on the screen and turn the top (focus) control until the letters are crisp and sharp. Go into the menu and turn the contrast and brightness all the way down, and then turn the bottom control (screen) until you can just see the picture, just above the point where the picture is too dark to see. Go back into the menu and reset the contrast and brightness and the picture will be back to perfect.
*The brightness control setting determines how bright your picture will be.
*The contrast control sets the gain of the video circuit. This determines the difference between dark and light scenes. Low contrast settings make the picture "hazy". High contrast settings make the picture more distinction between dark and light scenes.
*The sharpness control determine the frequency
response of the video circiut. High sharpness settings give better resolution but also shows
more noise in your picture. Lower sharpness settings smoothe out the picture removing noise but also fine detail. It needs to be set for the best all around picture.
*Picture Enhancement is pre-set adjustments which give you
different picture qualities. You just select the one you like.
In my case, the adjustment was available from outside the TV. Sortof. On the rear of the TVabout 2 inches to the right of the coax in, there are two vertical slits on a little protrusion. Inside the slits are the two adjustment screws. The lower screw adjusts brightness, the upper screw adjusts focus.
I spend 30 minutes popping the case apart just to find that I could not access the adjustment screws from inside. Lo and behold, they made them easily accessible from the outside. On a side note, I have never seen a TV designed as poorly as this on the inside. You have to literally reach in and unplug things just to get the back off. All the electronics save the tube itself are mounted to the rear chassis. On all other TV's I've seen (taken apart, rather), all the electronics are in the FRONT part of the chassis so that they move WITH the tube.