I have a Lg 55 uf6450-UA tv with no audio, no display, a flickering screen with a red light that blinking 3 times on the display when I power the unit on. This occurs temporarily when the tv has been unplugged for a while. The voltages on the power supply board at this time on p201 connector -pin1-3.3vdc pwr-on, pin 3-0 Grd, pin 5- 13.2,vdc pin 7-13.2vdc
pin 9-0v Gnd, pin 11-3.4vdc. All the readings are steady on the connector.
At the Test point 13.2v a steady 13.2vdcvolts. The voltages at P 801 the Led connector read LED+ 154vdc, LED-23vdc, led+ 319-346vdc not steady, led- 0v. I tested these points with the red positve lead & the black lead grounded to the chassis.
I also checked the voltages on the Main board connector coming from the power supply board Pin 1- 3.3vdc. Pin 5 -13.3vdc. The Led on the Main board(near the orange sticker c2314) is lite while the Tv is powered on.
The audio connector JK3800 no led lite is display.
The flickering stops after turning the tv on and off a few time but the red light still blinks 3 times when turning on the tv. The only voltages that changed when the flickering stops on the power supply connector p201 DRV-ON pin 11- 0vdc and the p 801 connector LED+ 138 vdc, LED- 10vdc, led+ 138 vdc, led- 0vdc.
I disconnected the P801 connector on the power supplyboard to the LEDS. The voltage on the power supply board LED+ 138vdc, LED- 0v, led+ 138vdc, led- 0vdc.
In need of locating a schematic for Lg 55 uf6450-UA tv
I think I have burnt out LEDs which is causing the incorrect voltages at the LED connector. I am not sure if repairing the LEDs will fix this TV since the main board is unavailable. Please help.
Any advice would be greatly appreciated.
pin 9-0v Gnd, pin 11-3.4vdc. All the readings are steady on the connector.
At the Test point 13.2v a steady 13.2vdcvolts. The voltages at P 801 the Led connector read LED+ 154vdc, LED-23vdc, led+ 319-346vdc not steady, led- 0v. I tested these points with the red positve lead & the black lead grounded to the chassis.
I also checked the voltages on the Main board connector coming from the power supply board Pin 1- 3.3vdc. Pin 5 -13.3vdc. The Led on the Main board(near the orange sticker c2314) is lite while the Tv is powered on.
The audio connector JK3800 no led lite is display.
The flickering stops after turning the tv on and off a few time but the red light still blinks 3 times when turning on the tv. The only voltages that changed when the flickering stops on the power supply connector p201 DRV-ON pin 11- 0vdc and the p 801 connector LED+ 138 vdc, LED- 10vdc, led+ 138 vdc, led- 0vdc.
I disconnected the P801 connector on the power supplyboard to the LEDS. The voltage on the power supply board LED+ 138vdc, LED- 0v, led+ 138vdc, led- 0vdc.
In need of locating a schematic for Lg 55 uf6450-UA tv
I think I have burnt out LEDs which is causing the incorrect voltages at the LED connector. I am not sure if repairing the LEDs will fix this TV since the main board is unavailable. Please help.
Any advice would be greatly appreciated.
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