Question about Televison & Video
I allready change the crt socket but still not in focus.
Hi. In almost all flyback trafo's there is a potmeter(knob) where you can adjust the focussing voltage. In some cases however, there is a separate HV potmeter with a connection to the flyback trafo. Normally there are two wires coming out it it. One for the acceleration anaode (25-29 kV) and another mostly thinner wire going to either the CRT socket (4-5 kV), or this divider unit with focussing potmeter. Servicecodes won't help here. These are only for geometry, ctr bias etc.
Posted on Nov 20, 2014
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Posted on Jan 02, 2017
SOURCE: hy-21n08 schematic diagram
For what? Brand name? Model number? Check the site linked below. There are some schematics. If you can't find your's, send your email address to me by Fixya. Please provide the exact brand name and model number of the set. If I've it, I'll surely send a copy of it to you by return mail.
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. You can also click the [Home] tab to see the latest updates. It will make search easy. There are more than 1350 posts to different brand TVs now. Pull up older posts there or make a search by typing in the brand name of the device in the "Search Box", at the top right of the display window
Posted on Dec 04, 2012
You can check it by reducing the value of the resistor, connected to ground at one end of the deflection yolks' vertical scan out windings. Usually, this resistor will vary a value of 1.2 Ohms to 2.2 Ohms. But, if you reduce this value too much, to say at about 0.15 Ohms or so, there is a possibility of damaging the vertical scan output IC.
So, do this very carefully. It is a trial and error process.
Check it with gradual reducing this value of this resistor; by 0.25 Ohms at a time. Wish you success. I hereby advice you, assuming that the horizontal width of the picture is OK.
If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy Pull up older posts. Surf the site with patience.
Posted on May 05, 2014
Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
Posted on Oct 29, 2014
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