Question about Televison & Video
If an LCD TV like this has sound with no picture (dark screen), that means that the inverter is not turning on. The inverter board is the part that supplies high voltage to the backlight system integrated with the LCD panel. Even if the problem is usually the inverter itself, the PSU and the main controller board must also be tested, as voltage line to inverter is delivered by one of the PSU lines (it works at different voltages), and is controlled by the main board.
Leave power cord disconnected for 15 20 minutes.
If you use a receiver box check the connection cables. Test the TV using different devices and inputs. This may not fix the problem, but it is part of necessary troubleshooting.
If there is sound but no video, then it is either the inverter or the PSU that is failing.
The PSU supplies DC power in different voltages. One of the output will supply power to the inverter, which is connected to the backlight system.
The inverter gets shut down, either because of a fault in the inverter board itself, or because it does not get power from PSU.
With no inverter the display will look completely dark.
Here general explanation of how an LCD can be tested: Testing LCD TV PSU and Inverter.
Here all parts for this set:ShopJimmy - Toshiba 32AV500U
Posted on Nov 22, 2010
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Posted on Jan 02, 2017
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