Question about Sharp Aquos 65" LC-65D64U LCD TV
Where on the power board sold I check for the standby voltage? There are two power boards mpf3930 and mpf3931. I have no standby led. Thanks
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Posted on Jan 02, 2017
First of all you should weight the cost benefit of repairing the set versus purchasing a new one.
Depending on the size and model of tv, it may be more prudent to simply cut your losses and buy a new tv rather than spend money swapping out circuit boards in the hopes of repairing a set in questionable condition already. Main / Power Supply / LCD Controller boards will typically run you about $100 each to replace, so weight that against the purchase price of a new tv that comes with a warranty.
Given that, if you are still intent on trying to repair the tv, and it does since you have gone out and acquired a service manual, there are steps you can take.
First of all the service manual should give you some idea what the blink pattern means on the front panel lights. Look that up first.
It does sound power supply board related, but bad capacitors are not always as obvious as the tell-tale bulging or gunk-leaking ones.
Use the manual to find out what voltages you should be getting out of which wires coming off the power supply board. In general, some will be 5VDC, some will be 12VDC, and some will be 24VDC. Test them with a multimeter and see if you are missing any.
Obviously this test requires you to have the unit plugged in and powered up with the safety covers removed. I cannot stress enough the potential dangers involved and if you are not confident with that level of maintenance, I would recommend you leave the live power tests to the trained technicians.
You said you didn't see any bad capacitors, so you may want to just unclip, pull out and then reseat all the multi-wire connector you can get to in case one of them just has a bad connection.
Good luck in the troubleshooting.
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Posted on Feb 15, 2011
check if their is a signal on voltages around 3.3v at the inverter board if none their is a problem in the board which is in the processor.
Posted on Aug 31, 2012
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