Question about Sony FD Trinitron WEGA KV-30HS420 30" TV
We have been encountering a problem with our Sony KV30HS420 TV recently. Everything will be working fine and all of a sudden the screen will fade out to black. The little red light on the front of the tv at the power switch will start blinking. All we have to do is hit the power button on the remote and it will fire back up and everything will be fine again. The problem is intermittant and it can be anywhere from five minutes to umpteen hours before the problem recurs. I cannot speak for the sound since it comes through the seperate sound system. This seems to be more frequent when the set is first turned on and has been sitting off for a long time. Any assistance would be greatly appreciated. We have had this set for about two years and need to decide whether it is worth fixing, or replacing.
The problem is very common the blinking power indicates bad soldered or theres a loosen part somewhere around in the power supply or in the IC system. i had encountered before with this kind of problem what i did i just resoldered the board that i mention aboved then the problem solved.
Posted on Feb 20, 2007
Sounds to me like a bad solder connection. I would suspect the crt filiments first, since you said it fades out. Could be bad solder connections any number of places.
Posted on Feb 11, 2007
I have the same problem please help
Posted on Feb 21, 2010
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Posted on Jan 02, 2017
The most common problem (I have fixed lots) is the Vertical amplifier has developed a loose connection. It probably just needs resoldering. As things expand it makes and looses connection you picture goes in and out. The vertical chip is a large black chip that gets hot, over time it degrades the solder until a connection is damaged. Most newer sets have a protection circuit that senses the lack of height, and shuts down the picture tube to save it. When the picture dropped to a line on older TVs and left that way too long it would burn a line into the face of the picture tube. You then had to have the picture tube replaced along with the vertical amp. it's kinda like a screensaver for your TV.
Posted on Feb 02, 2008
Hello,For model KV-40XBR800,
Pls check following area.
Low HV Shutdown:
On the D Board.
Check IC8004/pin 7 should be 7.4v.
Check IC8006/pin 2 should be 2.5v if lower will trigger shutdown by causing pin 1 to turn on.
Check IC8006/pin 3 reference voltage 2.2v.
IC8006/pin 1 normally at 0v. If high
turns D5007 ON which turns the latch circuit Q6532,
Q6530, and Q6527 ON and turns the AC relay RY6501 OFF.
And NOTE: 6 blinks also can be Low B+ protection.
Unregulated 7.5 v from the power supply to 5v reg IC504 on the A Board. 5v to M Board Q2314
to CPU IC2300/pin 43. If 5v missing set will shutdown with 6 blinks.
Posted on Oct 15, 2008
Symptom shows Lamp is weak in result and causing restart of TV again and again. Your TV requires new lamp as per following part number...
A1085447A* LAMP BLOCK ASSY XL-2200U
It is available in Sony Accessories Store for $200 and replacement procedure is written in instruction manual of TV.
Always buy Sony original lamp for TV and avoid aftermarket / cheap lamp for TV safety.
Posted on May 18, 2009
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