Got this fairly new 60" 4K Smart TV for free. The backlights flashed on power up and then gave a one blink code. Finding the service manual online confirmed one blink is bad backlights. TV is a bit rare so I couldn't find replacement strips online.
Opening up the panel, instead of probing all 20 strips, I video recorded the flash and searching through the frames found that one row was out. The left and right strips were individually wired and I found two bad LEDs on the left strip. I replaced with 3V Samsung compatible ones (same footprint) but they were a bit brighter and a little more yellow. I checked the right strip and it tested fine. This TV uses local dimming and it is controlled row by row.
With the TV reassembled, the picture looked great but if the image was light and bright, I could see the spots of the repaired LEDs. There was also a fleck of dirt trapped under the panel. Since I couldn't find strips, I figured I would move the repaired strip to the bottom row where it was less visible and remove the dirt.
Taking apart the panel a second time, I missed a screw in the bezel so when I lifted the TV upright, I pushed down on the panel and ended up cracking it.
More painful then when I tripped carrying at UN46EH5300 and my head went through the panel.
In the afternoon, a friend brought back a 50LN5750 to get the LED strips repaired a second time. I had put in used strips and lowered the backlight level to 60% about a year ago. I lifted the TV upright from the end which flexed the panel and cracked the corner inside the chassis. I have done dozens of the LN series without damaging them previously.
Parts for both TVs including LED strips for the Panasonic available on Ebay.
Opening up the panel, instead of probing all 20 strips, I video recorded the flash and searching through the frames found that one row was out. The left and right strips were individually wired and I found two bad LEDs on the left strip. I replaced with 3V Samsung compatible ones (same footprint) but they were a bit brighter and a little more yellow. I checked the right strip and it tested fine. This TV uses local dimming and it is controlled row by row.
With the TV reassembled, the picture looked great but if the image was light and bright, I could see the spots of the repaired LEDs. There was also a fleck of dirt trapped under the panel. Since I couldn't find strips, I figured I would move the repaired strip to the bottom row where it was less visible and remove the dirt.
Taking apart the panel a second time, I missed a screw in the bezel so when I lifted the TV upright, I pushed down on the panel and ended up cracking it.
More painful then when I tripped carrying at UN46EH5300 and my head went through the panel.
In the afternoon, a friend brought back a 50LN5750 to get the LED strips repaired a second time. I had put in used strips and lowered the backlight level to 60% about a year ago. I lifted the TV upright from the end which flexed the panel and cracked the corner inside the chassis. I have done dozens of the LN series without damaging them previously.
Parts for both TVs including LED strips for the Panasonic available on Ebay.
Attached Files
I am new to this forum but not new to forum world. I come from Automotive end of side which is my main passion in life. Give the automotive nature, I love fixing and restoring things and I have in the past fixed many simple electronics, soldering, etc.. but this is a bit more involved so I found this forum, and I am very glad I did.
Comment