Question about Televison & Video
SAMSUNG CRT TYPE COLOR TV MODEL CS568BS NO PICTURE&SOUND RASTER OK I CHANGED TDA8842 IC NO IMPRVMNT RGB OUTPUTS ABOUT 0.8 VOLTS PLEASE GIVE ME ADVISE HOW TO SOLVE PROBLEM.
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Posted on Jan 02, 2017
SOURCE: JVC Vertical Problem
You need to adjust the vertical height in the Service menu.Press the SLEEP TIMER key and set the SLEEP TIMER for ｢0 MIN｣. Then press the DISPLAY key and VIDEO STATUS key of the remote control unit at the same time to enter the Service menu.In SERVICE MENU, press the FUNCTION ▼/▲ key to select any of the SUB MENU items. (The letters of the selected items are displayed in yellow.)You want #2 DEF - go to sub-menu and look for the height adj. FUNCTION / key Setting (adjust) the SETTING VALUE of the SETTING ITEM. When the key is released the SETTING VALUE will be stored (memorized). EXIT key Returns to the previous screen.
Posted on Aug 22, 2007
SOURCE: CRT TV vert section
Vertical linearity is more of a DCV bias issue rather than feedback or AC coupling. Hence it would be more apt to suspect resistors rather than capacitors. Of course, it is also possible that the large IC that drives the Vertical output maybe at fault (least likely) but often would have trimpots for adjustment. Most current designs do away with trimpots and rely on self correcting (feedback loop) which is simply a resistor in the 100k range. In certain instances, it could be a thermistor or resistor or diode limiter attached to the yoke itself.
Best would be to use a service manual or at the very least a schematic diagram with voltage readings and compare actual on PCB against schematic.
If you could post back the make & model or preferably the chassis number of the TV, might be able to comment back known common vertical issues.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FixYa.
Posted on Jun 06, 2008
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