Question about Sony Televison & Video
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Posted on Jan 02, 2017
The problem I was having was that the vertical deflection was
collapsing on itself from the top. I'm a tech and I am visiting web
sites who experience similar problems with the Magnavox 20 MT4405 in
hopes of saving them time and money."Starsong" has the right answer.
Replace electrolytic capacitor #2465. It is a
10 microfarad electrolytic capacitor rated at 160 volts. Although the existing capacitor appeared good,in circuit and out, the charge-discharge time was flat as compared with a new capacitor. Plus, when the capacitor is in circuit with full voltage applied, the capacitor leaks too much. The cost of the capacitor should be under $2. It should take under a half an hour to replace. Be certain to let your set rest, unplugged, for at least a half hour before attempting to replace this capacitor. There are high voltage present around the crt even after the set is turned off. The high voltages can cause serious bodily harm. I would suggest a tech discharge the anode on the crt with a high voltage probe passing through a volt meter and running to ground. You will need a soldering iron, solder ******, solder, and I like to use a little flux for good adhesion of component to board.
Posted on Dec 06, 2008
SOURCE: Picture Problem
This is a problem (one of several) caused by poor solder connections on the circuit board. RCA uses the metal shield can surrounding the tuner circuitry (the area where the cable connector is located) to provide several ground connections. Many of these connections go bad (cracks form) and the missing ground connections cause the "picture shrinking" you see. Other problems are loss of tuning, set that intermittently turns off or on by itself, set that won't turn on at all, and even more.
The repair involves removing the circuit board and flipping it over so you can remove a metal cover on the bottom, repairing the several (many) affected connections, and then reassembling. This is a relatively easy repair for someone with soldering experience and the right tools (both a high-heat soldering gun and a low-heat iron are needed). But because of the fragile circuit traces in the repair area it is possible to do more harm than good if you don't know what you're doing.
RCA produced a service bulletin several years back detailing the areas to be repaired (although they still refused to admit they just hadn't soldered the places adequately to begin with). I'm not home now so I can't check my files but I'll see if I can find a link and add a comment later. When I was in the service business we charged around $60 for the repair. You might want to get an estimate from a shop (they should already be familiar with this trouble). Or if you're looking for a reason to buy a new set, try the repair yourself. If you're successful you've saved yourself the money. If not, it wasn't working anyway!
Posted on Feb 02, 2009
SOURCE: I have a Flat screen
Are the lines all the way across the screen? or just a few? Solid black - or trannslucent?
Horizontal drive has either data, voltage, or control problem from the pixel registry circuit......get it serviced before the problem spreads causing further damage.
However, in all likelyhood, the panel itself is bad. The Bravia line has had a bad rap about the faulty displays, and at $1800 replacement (plus labor) - it may be time to call SONY direct to complain!
Posted on Apr 02, 2010
That symptom may cause by the main board or t-con board, I suggest you do software up grade first.
Posted on May 07, 2010
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