sanyo dp42647

[OQUINN]

Has anyone worked on this model tv. Ive checked the voltage and it wa
correct. It has no picture at all but the sound works fine. When i tur
the set on it will light up then go to a dark screen. The channels wil
change and volume will adjust. Does anyone know what this is. I learne
this is a common problem with this model and hoped someone could tell m
what they have learned about it. Thanks in advanc


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OQUINN

 

On Sat, 11 Aug 2012 19:39:43 +0000, OQUINN
<OQUINN.a6c7248@diybanter.com> wrote:

Has anyone worked on this model tv. Ive checked the voltage and it was
correct. It has no picture at all but the sound works fine. When i turn
the set on it will light up then go to a dark screen. The channels will
change and volume will adjust. Does anyone know what this is. I learned
this is a common problem with this model and hoped someone could tell me
what they have learned about it. Thanks in advance
The symptoms indicate a backlight problem. It is probably an inverter

failure, but could be a bad CCFL.

A quick check on eBay shows there seem to be at least three different
inverters used on this TV. The inverter is usually supplied as part
of the LCD panel, so a defective one must be replaced with the
identical type.

I sould suggest comparing the resistances of the secondaries of the
inverter transfomers. Many of these problems are due to an open or
shorted transformer.

PlainBill