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You can adjust the brightness control on your 19PR19 Philips Tv. For that you have to go to picture contol menu
Do it as follows
To adjust your TVs picture control, select a channel and follow these steps.
 Press the Menu Button on the remote control to display onscreen menu.
 Press Cursor up or Cursor Down button until the word Brightness is hilighted. For each press of Cursor Up or Cursor Down button you can go through Colour, Picture, Sharpness, Tint, Colour temp etc, depending on the adjustment you want to make.
 Press Cursor right or Cursor Left buttons to increase or decrese the selected option. Ok.
This problem can result from the aging of various components within your set, in general with older TVs, particularly sets of 15 years or older for example tend to suffer from capacitors that degrade - effectively reducing the maximum level of picture illumination available. Another issue for old sets that have been used extensively is that of the picture tube's electron gun aging, over time the gun produces fewer electrons to fire at the phosphor coating hence causing less "glow" - this can be sometimes improved by adjustments to the tube. All in all the set may require a decent service to ***** what aged components need replacing. Some later TVs do have a trimpot on the flyback transformer to allow the tube's brightness to be increased, but most older sets lacked this feature. SHARP did have this feature on many of it's 90s TVs but it needs to be adjusted with care by suitable techs due to the dangerous voltages present.
This problems are on the video board,that connected to the CRT.The video IC inverter,all the capacitors around it.Some of the capacitors,that help to divert the colors are dead.Don't mess with the CRT Yoke,put it back to the original mark and tighteen it before,u misalign the three colors guns for good.
Brightness settings on any TV made since the early to mid 90's (besides tiny cheap B&W TVs) will have the settings in an on-screen menu. Sometimes the menu is accessible through buttons on the TV itself, but always accessible through the remote control. If your TV does not have the ability to get to the settings menu from the TV controls itself, you will need the original (or compatible) remote control for the set, there is no other option.
It could also be that the set is just dying; it's an older set, and certainly would be a possibility.
You would go into the menus to adjust the picture settings. Press the menu button repeatedly until you get the 'video' menu hilighted, then press the 'select' or enter or whatever button chooses, and then use the left and right arrows to adjust the settings, and the menu button to advance to the next selection. tom
Try the reset on the remote. Press this key twice to restore factory settings. The TV will automatically start Channel Search and clear all customized settings. These features will automatically reset:
? Picture/Sound Adjustments: Color, Tint, Contrast, Brightness, Sharpness, Color Enhancer, Tone, and Surround Sound
? Channel Memory
? Audio to Stereo
? Caption to OFF
? V-Guide to OFF
? Aspect Ratio to 4:3 (normal)
? Menu Language to English ? Sleep Timer (if previously set)
? Video to TV (if previously set) If desired, personal settings can be made again using the menu options