I have a problem with my tcl 21f5s crt tv..I has a vertical retraces at the top and single line on the middle..the upper part of the video is cut..I have already replaced bulged eletrolytic capacitors and vertical out ic for some open pins..however it remained the same..I need your help pls.tnx

SOURCE: LG vertical failiure vertical line at the bottom of the crt

replace the vertical driver ic and the proccesor ic

SOURCE: av32d305 yaa retrace line on the top of the picture

yes on the top of the picture

SOURCE: CRT TV vert section

Hi,

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.

SOURCE: TOP RETRACE LINE IN THE SAMSUNG CRT TV MODEL CB5081Z

you are going to find a open filter capacitor right at the vertical output chip (usually a 220 uf at 25-35 volts) that is open or low in value.

If the set is run like this it will soon destroy the output chip.

The Knight

• 76851 Answers
• Posted on Nov 22, 2012

SOURCE: apex gt2715 vertical sweep capacitors

Check the filter capacitor to the power supply to vertical output section. Normally, this supply will be provided by LOT. Check the rectifier diode and smoothing capacitor. Replace all the electrolytic capacitors [5 or 6 of them] in the vertical output section. It will be the best remedy. Never forget to replace the supply smoothing capacitor described above.
Visit the site named 'Electro-help' for more details. Click this link. View it in "Timeslide" or "Flipcard" option, which can be selected from the drop down box menu by the [Sidebar] tag, at the top left corner of the display window. It will make search easy. There are more than 1250 posts to different brand TVs now. Pull up older posts there.