I have a Sony KV-32HS510 that is 4 years old. Since new it has occasionally restarted after I turn it off. It now won't come on at all. If I leave it unplugged for several days and power it up it will blink 4 times, but after that when I turn it on it'll blink only 7 times. Is this worth repairing or should I look at it as an expensive lesson and not but Sony again? Thanks for any help.
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Re: No power or sound and 7 blinks
This behavior may be the power supply but that may not be the
problem. Modern power supplies are designed to shut down or cycle if the current
drawn exceeds the design level which indicates that something the supply
services has died. For gear made in the period of 2003-2006 and stock that is
still on hand from that period, may contain electrolytic capacitors that have
defective electrolyte, a chemical used in the manufacture of higher value
capacitors. The electrolyte was made from a stolen Japanese formula and
improperly cloned in . . . where else? China. There is no way to identify the problem parts besides the date
code if present. There are tons of electronic devices in service that will die due
to this problem. If you are adventurous, you might pull the plug on the set, gain
access to the innards, and with good light, inspect any boards inside. You are looking for components that are almost always cylindrical
and mostly installed upright at 90 degrees to the board with leads passing
through to the solder side. This same type of component in smaller dimensions is still used in
a horizontal package with leads bent down and passing though holes to the
solder side. The latter are becoming more rare since they don't lend themselves
well to robot assembly. Many (not all) will show signs of pregnancy when they fail,
bulging unnaturally when compared with others. Now and then, there may be
traces of a crystalline deposit around the end where the seal failed from
internal pressure. These will have values listed on them in uFd & VDC and
sometimes, a plus/minus number lying about the precision. The important ones will be near a shorter, stubby, ferrite core transformer, not the tall one attached to the picture tube. Some also have a date code (rarer) that will look like four
digits: 2403 = 24th week of 2003 Most electronics suppliers have a stock of the various values
but if they have a date code at all, try to get only those made before 2002 or
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Blinking of standby light in Sony TVs are fault indications. You just count the exact number of blinks occurs at a time after switch it ON. Switch it ON and OFF by its front panel power switch, and not by the remote control handset. Do this for at least four times, count the number of blinks, confirm and inform me. I can then locate the fault section of your Tv, seometimes even to the exact point of fault too. OK
I have seen this flashing before, this could be an indication that the picture tube is weak, what happens is that if the white balance is off there is a circuit called akb it monitors the kathode of each gun and if they are not in balance it will attempt to balance it out. if it can't the picture will begin to flash, sometimes in some models the power light will blink 5 times. On some models the power light will only flash if the tv gives up trying to compinsate for white balance and shuts off compeletely. If you see the tv shutting off with 5 blinks then you know for sure it is time for a new set.
If the blink repeats the same number of times (up to 6 or 7) between pauses, the number of blinks is a trouble code. Determine that number (count), then search this site and the web for your TV model and that code. Also look on the rear of the set for the chassis number, and search on that keyword.
The 7 blinks indicate a high voltage shutdown condition. This means that the high voltage has exceded 33,000 volts. This is usually due to a power regulator problem. The regulator in this set is probably an STRSxx (I don't have a listing for your model) and shouldn't cost more than about $25 or so. If the picture was good prior to the failure and you can replace the part for less than $150 or so, it is probably worth it.
It is impossible to guess at the parts without actaully troubleshooting the set with the proper setup.
From past experience, the areas that the fault for this normaly is, are the horizontal output ampliifer, main power supply, and sometimes there may be a problem with the vertical deflection amp.
In the horizontal output stage, with this set many times I have seen the flyback and output transistor go defective. When there aer problems in these areas, most of the time the power supply is damaged.
What is interesting, is ou say that this set is about a year old. In actual fact, this model is about 5 to 7 years old.
Considering the age of the set, I would be seriously looking at getting a new set rather than put money in to this one. This model is obsolete, and many of the parts for it are no longer availabe.
Blinking what - how many times before it pauses and then blinks the next set?? Sonys have an error code of blinking to help isolate the problem... (count the number of times it blinks before pausing and let me know).