Question about Sony Televison & Video
If you wish to get some details; check the site linked here. Pull up older posts.
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Posted on Dec 30, 2016
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Posted on Jan 02, 2017
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
try to fine tune your tv using the remote control, or, if you had knowleged in electronics adjust the sound IF transformer using a wood stick or plastic don't use a metal in adjusting the IF
Posted on Oct 10, 2008
SOURCE: too dark sony model kv21gmr1
Warning: The following procedures should be done by an expert.
1.First step is to check the physical condition of the set.Before starting troubleshooting try to resolder the board and find any cold or loss solder.Then after plug the set and see if the filament of the tube glows.If not the trouble is in heater circuit.
2.After seeing the filament if it glows, check the CRT socket and open it.If you can see a sign of terminal decay such as greenish unwanted element on terminal surface,replace the CRT socket.
3.If replacement does remedy the problem check RGB drivers and resolder or replace jungle IC.
4.Try also to adjust the screen adjustment found in the flyback transformer.
5.Another possible cause is the vertical IC.Adjust the screen to full and see if their is a white horizontal line on the screen.If so the problem isin vertical circuit.
Posted on Jul 13, 2009
SOURCE: Panasonic Quintrex 32" 100Hz CRT
I had this problem on my 42" Philips. Just got it yesterday and worked fine on the tv stand. As soon as I mounted the TV to the wall via wall mount system, I had the exact same issue you did. Figured it out today.
The wall mount was putting pressure against the center of the back of the tv (tv set had a slightly rounded back plate, and the mount was a flat plate). As soon as I put spacers (part of the wall mount hardware set) between the wall mount braket and the tv so there was no contact except at the mounting holes, the tv worked fine.
My theory is the pressure pushed the tv back plate against some board components which caused them to overheat (no air flow); or put pressure on internal connectors. I dont know.
Hope this helps, may not apply to your situation.
Posted on Sep 18, 2009
SOURCE: Sharp CX80H6
This style of failure with the CX80h6 and indeed other CX80 & SX80 series SHARP 80cm sets is usually due to problems with the PIP (picture in picture) sub-board. This small board plugs vertically into the main left hand PCB (seen from rear of set) and is sealed in tin-plate for RF shielding. I've had two CX80h6 sets recently with this exact failure and both had problems with the PIP sub-board. One needed a new regular on the board while the other had a dry joint on the connector. This sub-board is not available from SHARP anymore, but in most cases the failed component is a discrete that usually can be sourced in it's own right. So this sub-board is where I think you should start your fault finding.
Posted on Aug 15, 2010
Tips for a great answer:
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Feb 03, 2011 | Sony KV-20FV12 20" TV
Oct 17, 2009 | Sony FD Trinitron WEGA KV-32FS120 32" TV
Oct 19, 2008 | Sony BRAVIA KLV-S40A10 40 in. HD-Ready LCD...
Jan 14, 2007 | Hitachi C29-F200 29" TV
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