Question about Televison & Video
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Posted on Jan 02, 2017
SOURCE: Emerson EWL20S5 20 in.
This TV has a network of diodes connected
to a PROTECT-1 line monitored by the control IC. If any circuit pulls
this line low, the control IC turns the system OFF. The diodes act to
isolate all the circuits from each other, its called a diode-OR circuit.
You can troubleshoot by opening a diode which disconnects a circuit from pulling the line low. I had a hunch the EL backlight board was bad, so after opening that protect line the power stayed ON.
I found a bad .068uF 250V cap on the transformer primary, it measured .002uF. I've replaced the cap and the other two on the other transformers just for good measure.
It probably took more time than the TV is worth, but my friend's Mom will be happy, and thats worth it.
I hope this helps, look around for the service manual, it can be found online.
Posted on Jan 15, 2008
I had the same problem. Mine gave out in 4 months. Those boards are hard to find right now. Google the the board# BA71FOFO1042 and someone like (buyjimmy.com) I think will sell TV parts. If not, you can fix the board itself like I did. Mine was a bad inverter transformer. If you need the parts# for anything let me know, I have the Service Manual for the TV. Good Luck
Posted on Jan 25, 2009
1. On the power inverter board unplug all 6 wires that go to the LCD screen.
2. Test each of those ports for resistance.( the one without the resistance is the bad one.)
3. Or, test each port for Voltage output ( this will happen very briefly since the TV will turn itself off automatically).( The one without voltage will be the bad one).
Posted on Mar 21, 2009
Tries websites like Shopjimmy.com,Ebay.com.To buy a whole refurbish LCD inverter board.No,body will sell it to u in by componnents to componnents.
Posted on Apr 24, 2010
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