Samsung TV Keeps Restarting (Model: Samsung 55" Smart TV UA55KU6000K)
Symptoms:
- Samsung TV (55" Smart TV) is restarting every 5 seconds with no picture and a black screen
- Suspect either backlight malfunction or LCD Panel itself is cracked somewhere
Findings:
- LCD Panel is having cracks near bottom right-side corner, causing short circuit at LCD Panel Driver Board.
- This fixing (bypassing few pins at ribbon cable) only resume the TV screen to be able to display, but unable to solve the LCD panel cracked issue. Thus, the TV screen display is deteriorated (slightly red in colour) at the right-side screen.
- New TV LCD panel from Samsung costs RM2xxx, which is NOT WORTH for a repair. This TV is still able to work temporarily while waiting for new TV purchase.
Videos:
- Samsung TV is restarting every 5 seconds with no picture and a black screen
- Samsung TV able to resume working (with deteriorated screen at right-side)
Photos:
- Flip over the TV, unscrew all the screws at the back cover of the TV
- Identify the Power Supply Board (right), Control Board (left, with built-in T-CON), and Panel Driver Board (bottom, with 2 ribbon cables connected from Control Board)
- Disconnect the Power Supply Board supply output cable to Control Board, turn on the TV, the backlight is turned ON, means backlight is working fine. Turn off the TV, reconnect back the supply output cable.
- Disconnect the 2 ribbon cables from Control Board to Panel Driver Board, turn on the TV, the backlight is turned ON, followed by a sound from the speakers, means Control Board is working fine. Turn off the TV, reconnect back the 2 ribbon cables.
- Analyse the ribbon cable, by disconnecting 1-by-1. Use cellophane tape to mask some of the pins on ribbon cable, then turn the TV on and off to identify if the TV screen is working or not (repetitively for many times). Finally identified only 2 pins that needs to be masked (to isolate short-circuit caused by cracked LCD panel) at the right-side Panel Driver Board.
- Upon completed fixing, turn on the TV, you can see clearly the cracked LCD panel (located near the bottom right-side corner)
Tools:
- Screwdriver
- Scissor
- Cellophane Tape
Cost Involved:
- Free (Although unable to fix the cracked TV panel screen, but at least able to make the TV to display again without restarting, with deteriorated screen display.)
Reference: