howie
Junior Member
Posts: 87 
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Post by howie on Dec 13, 2015 16:56:56 GMT -5
This is a LED flatscreen that uses a 19VDC brick for a power supply. I have not been successful in finding anything useful to help in the repair. I have followed power down to the small LED board and confirmed power to the board. There is a 4 wire connector on the board with red, orange, brown and black. Black and brown seem to be grounds and I'm showing 4.99 volts on the red and 4.89 volts on the orange. I would think the standby led should be lit. Help oh yee master of the electrical.........stuff.  |
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Post by mastertech on Dec 13, 2015 19:11:30 GMT -5
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howie
Junior Member
Posts: 87
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Post by howie on Dec 15, 2015 5:41:31 GMT -5
Is there a way to test that part in the first link before I order it. He's asking $15.00 for a -$4.00 part but I can't seem to find it local. |
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howie
Junior Member
Posts: 87
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Post by howie on Dec 15, 2015 7:04:37 GMT -5
Is it safe to assume part of his fee includes programming and some markup?
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Post by mastertech on Dec 15, 2015 21:03:44 GMT -5
The board repair is pretty cheap so it cannot be much of a repair. Could be the Eeprom replacement. The only thing you can check on the eeprom is for a short to gnd.
Most likely that eeprom is preprogrammed. Most tv ones are. So buying one from a basic supplier is probably blank and would not work.
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howie
Junior Member
Posts: 87
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Post by howie on Dec 16, 2015 5:42:18 GMT -5
The board repair is pretty cheap so it cannot be much of a repair. Could be the Eeprom replacement. The only thing you can check on the eeprom is for a short to gnd. Most likely that eeprom is preprogrammed. Most tv ones are. So buying one from a basic supplier is probably blank and would not work. I did get a reply back from the eeprom supplier and he suggests that if there's no stdby led that it's the power supply. It's a 19 VDC brick that works on another device. I have power all over the board but it's totally unresponsive. |
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Post by mastertech on Dec 17, 2015 12:10:57 GMT -5
Well the standby led is usually turned on by the processor and a properly working eeprom is usually required for the processor to work so I cannot fully agree with that statement.
But without a schematic I cannot really say where is what. I would go to the main processor and see if it is receiving power. You can find which pins should have power with a datasheet of that ic, if one is available.
Also, see if you can trace back the standby led lines and see what they connect to.
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howie
Junior Member
Posts: 87
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Post by howie on Dec 20, 2015 7:26:09 GMT -5
Well the standby led is usually turned on by the processor and a properly working eeprom is usually required for the processor to work so I cannot fully agree with that statement. But without a schematic I cannot really say where is what. I would go to the main processor and see if it is receiving power. You can find which pins should have power with a datasheet of that ic, if one is available. Also, see if you can trace back the standby led lines and see what they connect to ordered eeprom. Worst case I wasted $15.00. That is as far as I will go with it. |
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howie
Junior Member
Posts: 87
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Post by howie on Dec 29, 2015 16:43:48 GMT -5
Just whacked the eeprom in and IT'S ALIIIIIIIIVE!!!
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Post by mastertech on Dec 31, 2015 15:32:45 GMT -5
Hey, great job. Glad it worked out for you. |
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