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zalek zalek is offline
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Default Repairing LCD TV - Westinghouse LTV-32W3

On Feb 3, 2:01 pm, wrote:
On Sun, 03 Feb 2008 18:11:23 GMT, wrote:

I am trying repaire my LCD TV Westinghouse LTV-32W3. I purchased it 1
1/2 year ago - it worked OK for about 1 year. After warranty expired
it works OK for about hour, after 1 hour the following symptoms
appeared:
http://www.evkosystems.kgbinternet.c...Bad-TV-2-1.wmv
The TV on the left is a good one, on the right Westinghouse LTV-32W3


I come to conclusion that some parts in the TV are getting too hot. To
test my theory I removed TV's back cover to allow better air
circulation - now TV is working without problem. What I want to do is
to install small fan to make a better cooling.
I am not a TV technician, so here are my questions:


electronics parts that are getting hot are enclosed in a metal case:
http://www.evkosystems.kgbinternet.c...v/IMG_0014.JPG
here electonic parts with metal case removed:
http://www.evkosystems.kgbinternet.c...v/IMG_0017.JPG
I guess the metal case is to prevent electromagnetic transmition - can
I make more holes in a metal case without causing electromagnetic
interferrence?


I plan to put inside a small fan, similar to one used in computers -
can you recommend one?
Can you recommend simply converter from 110 AC to 5V(?) DC to power
this fan?


Thanks,


Zalek


A fan will only solve the problem temporarily.

Why? Because the TV worked okay for over a year before developing this symtom.
That means something has changed or deteriorated. You have what is called a
"thermal intermittant". That's a problem that shows itself when things get
either hot or cold. The problem is either a solder connection that is going bad
or a component that is failing. If it is a component that is failing, it may be
stressing other components at the same time.

You are ultimately not going to win this one. That much is certain. If the TV
isn't worth a trip to the shop for a proper diagnosis and repair, then you have
nothing to lose except the time and effort. Even with your makeshift
work-around, it's days are numbered. The problem will get worse until there is a
more profound failure.


Well - I tried to repair it - the technician kept it on for over 1
hour, but the TV worked OK. I noticed that the temperature in his shop
was much lower then in my apartment - I told him, but technician gave
up and refused to give estimate. I enjoy to play with electronics
gadget, so even my project will fail - for me it is fun.

Zalek