My panasonic tv 21 model TC-21P2A a problem picture, color, brightness, is very low

Is it plasma

Try these settings:

Picture Mode: Movie
Contrast: 100
Brightness: 44
Sharpness: 20
Color: 50
Tint: 50
Backlight: 7
Color Tone Warm1
Digital NR Auto

Detailed Settings
Black Adjust Low
Dynamic Contrast Low
Gamma -1
Color Space Auto
Edge Enhancement On
xvYCC Off

White Balance
R-Offset 21
G-Offset 20
B-Offset 21
R-Gain 0
G-Gain 21
B-Gain 26

My Color Control
Pink 20
Green 15
Blue 15
White 15
Auto Motion Plus 120hz: Low

Check for any loose solder points at its base card.

That can be the T-CON board problem or it is not getting clean DC feeding it. It will require in-depth troubleshooting to be 100% sure.
http://s807.photobucket.com/albums/yy352/budm/LCD%20panel/

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: www.interliquidparts.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.

Do you have access to a test pattern or color bar ? .If you have a THX certified DVD ( some Walt Disney movies ) it will have calibration setup guide in the DVD menu.Or else you have to buy a calibration DVD if you are serious about your TV setup.
First you have to set the contrast and brightness using the Grey-scale pattern. Seven set of vertical bars slowly progressing from white to black. If set right you should be able to make out all the seven bars with out each merging ( or overlapping ) into the other. You will be able to see the line of demarcation between each vertical bars. Then set the color to taste.
If you do not want to purchase the above mentioned DVD disc a close setup figure for your Panasonic TV would be
Picture Mode = Standard ( Normal )
Picture ( Contrast ) ---- 50
Brightness ---------------- 50
Color ------------------------ 33
Sharpness ---------------- 50
Hue ------------------------- In the middle
This setting should give you a decent picture quality assuming your TV is new.

Find what the low and high numbers are and set them to the middle, e.g. 0-10 set on 5 This is the optimized condition from the engineers. Then you can increase or decrease each parameter to your likings.

What kind of cables are you using to hook up the DVD to the TV? Are they they composite, component, or S-Video? What are the connectors you're plugging both ends of the cables into labeled? Are you plugging the audio cables into the TV or directly into the sound system?

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