I have a Toshiba 20DL74 LCD TV & when i power on the unit no picture
comes up only audio, unit was never dropped or nothing a like - can
someone let me know what could be wrong with it? Thanks in advance

It is impossible to be a fortune teller with electronic equipment. The fault
can be anything from a failed driver board, to the power supply. The set
would have to be properly troubleshooted by a trained technician using the
proper tools and service information.

--

JANA
_____


"Animal" wrote in message
ups.com...
I have a Toshiba 20DL74 LCD TV & when i power on the unit no picture
comes up only audio, unit was never dropped or nothing a like - can
someone let me know what could be wrong with it? Thanks in advance

Animal wrote:
I have a Toshiba 20DL74 LCD TV & when i power on the unit no picture
comes up only audio, unit was never dropped or nothing a like - can
someone let me know what could be wrong with it? Thanks in advance

There is an internal failure that is causing no picture.

The ONLY troubleshooting a non-trained person can do with an LCD device
that has no apparant picture at all is to shine a bright flashlight on
it to see if a picture is actually there but not visible due to a
backlight or backlight inverter failure.

Even if it can be determined that the backlight has malfunctioned, a
non-trained person will not have the knowledge or equipment to actually
troubleshoot the real electronic failure.

Ok - kool lady & gents - Sorry Jana - I didn't mention it before - I've
been a service tech w/ Audio systems, DVDs & TVs down to component
level before, i gave it up (8 years ago) and started repairing pc's -
I've never been in a LCD tv before and it looks very different from a
reg tv - BUT - the parts inside are mostly plugin boards so to find the
defauted board shouldn't be that hard providing someone in this group
knows which board to replace or part without actually troubleshooting
the unit (by repetitive problems). When I was repairing units in the
past & cust tells me the problem with the unit in question i would know
off the back what was wrong with it without using any troubleshooting
equipment - using equipments is only to confirm your outcome unless
you have to do adjustments that require you to use the equipment.

dkuhajda
thanks for the tip but you don't have to be a qualified electronic
tech to install this part go ahead copy and paste following link
http://www.lcdpart.com/doc/inverter_installation.html - but the
internet now a days its awesome - notice the following "it does not
require any technical skills" now im narrowing it down to the
defective part and I haven't used any equipment - just the internet,
unless you consider the internet as piece of equipment - actually it
is...

Mike - right on - are you a tech? I do second that opinion that
you mentioned - a true tech - without the mumbo jumbo "you have to
be a certified tech to---" would tell you well the inverter backlight
can be defective or what is the voltage on pin - etc....

Okay yes - I've noticed that when all my lights at home are off I
do see a very faint picture & the channel display upper right side of
LCD. So if I do see a faint picture can this be the backlight
inverter? Thanks in advance.

If you wanted to actually repair the defective inverter, which is
usually possible and typically has less than $5.00 in total parts, then
you want to be a technician. I usually repair 95% of the failed
inverters for less than $1.00 worth of parts. In order for it to be
cost effective to actually repair the inverter the replacement inverter
has to cost more than $30.00 and the needed repair parts to fix it need
to be on hand the first time the unit is opened up.

Since you see the faint picture, then you have already narrowed down
the problem to the lamp, the inverter, or the circuit to turn on the
inverter.

You can guess that it is the lamp or the inverter and order and replace
both and chances are very high that this will fix the problem. I am
not sure you can buy the inverter as a complete part from Toshiba and
at what cost, you can do the web searches to find out.