zalek wrote:

On Feb 3, 1:11 pm, 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


Thanks for all replies. This week I got very thin fan that can be
attached to a metal sheet that covers the circuit board that I think
is overheated. Here is PowerPoint (3mb) as it looks like on my TV:
http://www.evkosystems.kgbinternet.c...inghous-tv.pps
The fan is very quiet.
Now I have a problem - how to connect this fan to electricity. I have
a small power supply 5V, but if is difficult to find 110V AC after a
power-on switch. I see many open points on a circuit board, but even
it shows 5V, I am afraid to connect to a fan. What do you suggest?

Thanks,

Zalek
Hi,
From the board find a source for 5V or 12V DC depending on fan voltage.
You can include an in-line pico fuse if you wish. Thought about drilling
whole bunch of holes at the bottom/top of cover to increase the air flow?