Question about Sharp Flat Panel Televisions
Online research suggests the power supply on my Sharp LC-46D64U is bad (power LED blinks 2x/sec and OPC LED blinks 1x/sec). Power supply p/n is DPS-304BP-1 (a/k/a RDENCA235WJQZ).
The symptoms are when you plug in A/C, the relay clicks once and then the front panel LED blink. Activating the power switch on the set results in same behavior (i.e. relay click & LED blink).
Visual inspection of the p/s board does not show signs of any failed/damaged components, hot spots, cold solder joints, or smell - it looks just fine. I'm out of warranty.
I would like to confirm the p/s is indeed the problem before buying a replacement. I haven't found any schematics/technical info to aid in troublshooting. Voltage measurements indicate the primary side is getting good 120VAC from the DC-2541-1A (a/k/a RUNTKA317WJQZ) board & I've measured some 5VDC and 3VDC points on the secondary side, but I have not found any 15VDC or 60V or any other voltages (which I suppose could be due to the fact p/s is not "starting" up).
Does anyone have a schematic or technical information or suggestions on troubleshooting the p/s so I can purchase a replacement board with confidence?
Buy the green light going on means Standby is ok. Next, would be to locate the plug coming from the main board to the power supply and find the post that says PO which means power on. With your meter on that post, press the power button as see if the reading goes High, if it does then the main board is able to turn on the power supply. Next, find the plug on the power supply that goes to the inverter( the long board on the side) remove it and see if you have 24 volts coming out of the power supply when you press the power. If you do, then the inverter board is bad, if you don't have 24 v, then the power supply is bad. There are NO diagrams available for these set other than a flow chart if you can find one. A regular svc tech does'nt need a manual for these anyway.
Let me know how you do Kathy ?
Posted on May 17, 2009
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