Question about Televison & Video
Although most HD TVs are 120 VAC devices, they actually have step-down power transmission sectios that take the line voltage from the wall outlet and turns it into the 13.8 VDC needed to run the HD TV. So, what does this have to do with the price of tea anywhere? The answer is that if you look at the output side of the power supply circuit, you will see the 13.8 VDC power signal appearing. That voltage, though, is there to tell you that power is available.
Now, take a look at the power supply circuit either in the owner's manual (if it is supplied) or on the lid of the power supply in the HD TV itself (warning, only open this device if you are familiar with and comfortable with working with voltages and a DC volt meter) and you will see at low-amperage circuit -- in the 1 to 5 amp range -- and a high-amperage circuit -- up to 20 amps. This is the important circuit because it drives the TV.
You will have to go into this device while it is on, so extra careful that you stay away from the AC input. You can look at the DC output because it is low-voltage.
Placing the probes of a volt-meter (in the appropriate range setting) across with the black (-) lead to ground and the red lead on the high-amp positive lead, measure the voltage. You should read 13.8 VDC or a similar reading. If you do not see any voltage on this terminal -- which I suspect the the case -- then you will have to replace the power supply. If you feel comfortable handling this repair, you can do it yourself. I would suggest taking it back to the store where you bought it and have them fix it -- to keep the warranty intacty -- or have them send it back to the manufacturer.
Posted on Nov 26, 2014
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Posted on Jan 02, 2017
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Mar 11, 2011 | Toshiba Televison & Video
The 42RV530U is known to develop problems in both the power board and the main board.
You can check out our power board repair service at
and I'd also recommend that you search for 42RV530U at http://blog.coppelltvrepair.com as we will eventually release an article on how to test the board.
Hope this helps.
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