Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default sanyo dp42647

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
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Default sanyo dp42647

On Sat, 11 Aug 2012 19:39:43 +0000, OQUINN
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
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