Set was working fine then turned it on and all I recieved was a horizonal white line across the center of the picture.
After a few minutes the picture would appear.
Any ideas with part numbers and appox cost to fix
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Re: Horizonal White Line
Your problem could be one of the common ones as this set has loads of bad solder connections. Your problem is most likly the verticle output IC connections or the B+ feed componets have bad solder connection on them. In some cases though the Output IC is defective and will need to be repalce. if you have no soldid state repair or soldering skills play it safe and get a pro to assist you in this repair. It should not cost you more then a hundred bucks or so and thats the high end. good Luck, And Merry christmas.
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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. http://electronicshelponline.blogspot.com/ Type in this key phrase " my service table today " in the search box at the top right of the the home page, to get gathered some pages which has the details of practical experiences of the author of that site. The search result might display about 20 Nos of related posts. Press the "All posts" at the bottom of the list, then you can select them one by one.
In most cases the following parts need to be replaced I think the part location numbers are accurate
IC421 LA7832 ( vertical output IC )
Capacitor C424 100UF @35v
Zener Diode D422 MTZJ75-T2
Resistor R541 1.8ohm 2watts
I noticed a bright horizonal line about 1/4 in.wide centered in the middle running from side to side. Audio is fine. This just all of a sudden happened it was not gradual.
it is due to vertical section failure.
please minimise bright to protect crt.
1 check supply to vertical section.
2 check for ic failure in vertical section
3 check vertical output section parts.
Is it fixable or dumpable?? Please HELP!!!!
yes it is fixable
it is common problem not major one.
The several thin white lines at the top of the screen is the warning that the vertical output IC is not getting the boost voltage it needs to run correctly. The IC cannot operate for long like that and shorts out inside, which is when the vertical collapses altogether and you get the thin white line through the center of the screen. The good news for your son is that he had nothing to do with that, and it has nothing to do with the cable F connector. The set needs to be serviced by an experienced tech who will restore the boost supply and replace the vertical output IC, and when I do that I charge $75 but techs in your area will vary, so be sure to ask around.