Question about Westinghouse LTV-20V4 20 in. EDTV-Ready LCD Television
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Posted on Jan 02, 2017
The simplest problem would be the failure of the backlight.
In case you don't already know it, there is one, and they may or may not last forever.
Also, there is an extra power supply to produce the high voltage the lamp needs to fire that may have failed.
Sometimes, you can look at the screen from an angle to see if there is any sign of movement.
If you can see program material causing a change in the faint image, then you can be pretty sure it is one of the two problems mentioned.
Posted on Sep 01, 2008
This problem is with fair certainty the
Modern power supplies are designed to shut down if the current drawn exceeds the design level which indicates that something the supply services or the supply itself has died.
If you are adventurous, you might pull the plug on the set, allow the set to sit overnight, gain access to the innards, and with good light, inspect any boards inside. If you see one that has few ICs but many more larger discrete parts, this will be the power supply.
You are looking for components called electrolytic capacitors 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.
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 after 2006.
The larger caps will probably be OK since the failure is likely related to functions other than brute-force filtering. A pretty good 'rule of thumb' is to replace any caps you see bulging that are 100 uFd or less.
If you choose to replace these yourself, you will need a quality soldering iron with a small, preferably iron-plated tip, rosin core solder and a sponge which when wetted is used to frequently wipe oxidized solder from the tip this should be kept bright and clean and fresh tinning will keep it that way.
You should also buy some solder 'wick' with the iron; this is used to place on the solder you wish to remove and then heated with the iron. Properly used. the wick will absorb nearly all of the solder from the lands from which you wish to remove a component.
Posted on Oct 07, 2008
Hello, if the remote is a universal remote you will most likely need to input the Sony codes. Another option is to purchase an original remote at firstname.lastname@example.org, the price for the remote is $15 plus $5 shipping and handling.
Posted on Jan 26, 2010
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