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
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:
here electonic parts with metal case removed:
I guess the metal case is to prevent electromagnetic transmition - can
I make more holes in a metal case without causing electromagnetic
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
You can purchase a 120V AC fan at an electrical store, but make sure it not
too fast or you will hear it. Most computer fans are 12V and will work with
just about any 12V converter that you laying around, or you can get one at
an electronics stores.
If it was me, I'd put a small fan in the lower right (viewed from the back)
section pointing towards the side (just below where the power cable
connects) to suck air from the inside. You can get those same style fans in
115 VAC (GOOGLE is your friend) so as not to have to deal with another power
supply. BTW, computer fans are usually 12 V not 5 V.
If it was me, I think I would try to figure out what is actually wrong with
it first. Fitting a fan is attacking the symptoms rather than the cause, and
if a component such as an electrolytic cap is failing, or a bad joint is
starting to show up, it is unlikely that its demise will be arrested for
good, merely by the addition of a fan. It's a bit like going to the doctor
and telling him that you get short of breath when you climb the stairs, and
his 'fix' for your problem being to suggest installing a stairlift ...
An intermittent problem such as is shown in your film, and that is clearly
heat related, should not be difficult to find, if you approach it armed with
a hair dryer, and a can of freezer. If it then proved to be an
'unrepairable' fault such as one of the LSIs, or even just a bad joint on
one, that you likely wouldn't be able to fix with basic home soldering
equipment, then you might consider that your TV has terminal lung cancer,
and the best you can do is to get what remaining life out of it that you
can, by installing that 'stairlift' !
On Sun, 03 Feb 2008 18:11:23 GMT, firstname.lastname@example.org wrote:
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.
Those bands are the most common failure mode for LCDs.
There is some kind connector inside with a lot of pins.
The heat is making them loose contact.
I don't think it's cost effective to repair, but if you
succeed let us know. I have 2 LCDs with this problem
that I'm going to dispose of in the spring cleanup.
Frys and other electronics shops have cans of "circuit
cooler" that can be used to chill a suspect part. You might
be able to pinpoint the part that has changed value over
time. I would tend to look at electrolytic capacitors
first, then stressed diodes or transistors.
Also, try repair shops that have worked on that model, most
likely it is developing a reputation that a tech has seen
before. try the electronics repair boards, or google that
model and "+trouble".
-- larry / dallas
I would try to troubleshoot the set to find the components that have
become thermo sensitive, and change them. Then I would put in a fan if I
thought the set was running too hot.
If you have some thermo sensitive components in the TV set, with time
they will keep degrading until they fail. At this point, the problem may
be more serious.
< email@example.com> wrote in message
Fluorescents are discharge lamps, the smallest in the world require
somewhere around 50V to draw an arc through the low pressure argon/mercury
fill. Cold cathode lamps used in LCD monitors require a higher voltage,
usually 500-1500V run with a 2-4KV ignition pulse. Any fluorescent
application with a low voltage power source uses an electronic inverter to
provide the required voltage and regulate lamp power.
On Sun, 03 Feb 2008 18:11:23 GMT, firstname.lastname@example.org put finger to
keyboard and composed:
I have no experience with LCD TVS (only LCD monitors), but I'm
wondering what is inside the tuner/IF can that warrants a heatsink for
this module? And why do the other chips require such massive heatsinks
when I see nothing of that kind in LCD monitors or digital STBs?
- Franc Zabkar
Please remove one \'i\' from my address when replying by email.
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