Question about JVC AV-35750 35" TV
I have JVC AV 35750 CRT TV and intermittently the picture becomes a single horizontal line. If I bang it, or off/on (after 30sec-1min), it comes back on. Sound is OK.
I am also seeing horizontal stray lines some times.
The TV is about 10 years old. Thank you in advance.
It's ring cracks on the solder joints of the vertical IC... IC421 i mounted to a small heat sink on the board. With the unit off and unplugged remove the board and locate IC421 (LA7832) and closely examine the pins connecting this component to the foil side of the board. You'll notice small rings around the footings that are actually open cracks in the solder, caused by heating and cooling over a period of years. Simply and carefully reflow some solder over these cracked joints, careful not to get the ic too hot in the process, and put it back together.. That should sole the problem...
Another problem we encounter a lot in the vertical deflection circuit of this unit are the two feeder caps C424 (100UF/35V) and C425 (470uf/35v).. If you're already there you might want to go ahead and replace these as well - save taking the back off again if they go bad..
Posted on Nov 13, 2007
Wow I miss these days.. Replacing 100UF caps for Vert. circuits on old RCA's and similar.. Got into Laptops now but happened-stanced on this website and the Premtech knows what hes doing.. (Remember the GE/SYL chassies w/ Cold joints in the integrated tuners)?.(snowed out) Thousands). Have fun guys and I'm here to help as well. (Laptops High end stereos, and Hi-def TV's only please).. (Hate telling people their toaster ovens are replacable.. (Blue haird's) Good posts!
Posted on Jan 13, 2008
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