Question about RCA HD50LPW175 50" HDTV
I was given this TV by the original owner who had the same problem with th LCD panel lights flashing 5 times then shutting down. He ordered a replacement bulb, but that didn't fix it. When he inquired about further on site repair the price discouraged him so he gave me the TV. I am a computer repair tech with some electronics experience ( ex-military avionics tech ). After on line researching I ordered and replaced the Light engine ( inverter/ballast ). The previous inverter had ~ 336 VDC input and no output and a forums user said it was bad. The new unit didn't fix the problem, and also has no output. Does anyone have a repair manual or schematic for this machine? I'm working blind and am not a TV repairman, though this seems like it should be repairable. Also, can the existing lamp be continuity tested ( previous owner sent the replacement lamp back when it didn't fix the problem ). The original lamp tests as open with a multimeter and it seems the filament should be a closed circuit unless there is something I'm not aware of in the design. Any help or tech literature would be greatly appreciated. Thanks
Before read this, keep in mind that this is not your model and parts are not the same. This is just to let you know the steps to take. Sorry don't have the schematic for your set, but maybe this will help in checking. I'm Ex-Army myself and Veteran of OIF and OEF.::::1. (Lamp may light and go out) suspect bad lamp part # 915P020010 2. Check for 12-volts DC at J-9 connector pin 4 on the Engine Driver PCB, if missing check for an open F9A09 on the Power PCB, if it is open replace F9A09 part # 283P127060 and the Light Engine part # 939P977010 3. (Lamp may light and go out) Check for 5-volts DC at J-9 connector pin 1 and 2 on the Engine Driver PCB if low or missing check C9A37 and C9A38 both 3300 UFD 10 V on the Power PCB (part # 930B921002) 4. At power on the lamp turns on and off three times and then the unit shuts down with a red lamp LED (lamp error). Replace the Light Engine part # 939P977010 5. Lamp enable line at J14 pin 6 does not switch to 5 volts after turn on, 12 and 5 volt supplies are good. Suspect the Light Engine part # 939P977010 6. Lamp enable line at connector J14 pin 6 on the Engine Driver PCB switches to 5 volts after turn on and does go to 0-volts (low) after 5 seconds, 12 and 5 volt supplies are good. Suspect the Lamp Power PCB (ballast) part # 939P978010 7. Lamp enable line at connector J14 pin 6 on the Engine Driver PCB switches to 5 volts after turn on but does not go back to 0-volts (low) after 5 seconds, 12 and 5 volt supplies are good. Suspect the Light Engine part # 939P977010
Posted on Aug 26, 2007
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