Question about Televison & Video
Posted by Anonymous on
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Posted on Jan 02, 2017
When a red crt goes out and wont light its usually another reason such as a transistor or even faulty CRT pc board that causes it since the set powers up the other two tubes. Go to this link and leave them an email and list the model number and tell them the symptoms they will help you out with it, they are real good with the RCa sets. If the red tube was shot it would cause the set to go into shutdown or throw red retrace lines across the screen. Heres the link,
Posted on May 21, 2008
SOURCE: My CRT TV has false colours.
The set needs degaussed this is common issue, most tv's have a degaussing coil in them, but they are very weak and will not correct extreme issues. It is possible the internal degaussing coil has stopped functioning. If this is one of these sony 40" crt's this is a big problem. and any metal near by will cause gausing of these tubes. Have a tech come out and degause your tube. A technician will have a very powerful loop coil that will clear the problem with one or two passes. But if it returns, check for perminant magnets near the set like large speakers or any other thing, this can also be caused by a child;s toy with a magnet it it if the child has rubbed it across the screen. This is not a destating issue and can be corrected easly.
Posted on Sep 03, 2009
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I would suspect the trouble is one of two things---a shorted device like an IC on the board at the end of the picture tube---most sets use either 3 transistors, one larger IC or 3 individual chips---first thing is to examine the soldering on that board looking for any broken connections.
If you can find a schematic for the set voltage checks will pinpoint where the issue is---an old trick if uses 3 transistors or 3 chips is to identify which is green and swap it for one of the other 2 if numbers on them are identical.
Second and fatal possible reason is the green gun in the CRT picture tube is shorted---almost no way around that as the tube itself would have to be replaced---most modern shops are able to test the tube and determine if shorted or not.
Posted on May 03, 2012
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. Pull up older posts.
Type in this key phrase " my service table today " in the search box at the top right of the display window of the home page, to get gathered some pages which has the details of practical experiences to the author of that site.
Posted on Jun 22, 2016
If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ Circuit diagrams of SMPS section of many popular brand devices are given. Search the site by type in the "brand name" or the STR number of your device, in the "Search box at the top right of the Homepage" to get gathered related posts.
Posted on Sep 30, 2016
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