Insignia NS37D20SNA14 Weird Intermittent LED Backlight

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • bluerider
    New Member
    • May 2014
    • 2
    • Canada
    #1

    Insignia NS37D20SNA14 Weird Intermittent LED Backlight

    I've got 2 of these Insignia LED TVs with the same problem - LED backlight was off - audio and all other functions were good. Removed LED backlight connector from power supply, re-seated, and backlight now works....for about a week, then same problem. Re-flowed solder around connector and driver components. Again worked fine for a week, then same problem fixed by re-seating backlight connector! Any ideas?

    Thanks!
    Tags: None
    • CapLeaker
      Leaking Member
      • Dec 2014
      • 8133
      • Canada
      #2
      Re: Insignia NS37D20SNA14 Weird Intermittent LED Backlight

      maybe the backlight cable shorting out?

        Comment

        Previous template Next

        Related Topics

        Collapse
        • C152Heavy
          Samsung LN46C630K1F – Intermittent Backlight, BN44-00341B Power Board
          by C152Heavy
          Samsung LN46C630K1F – Intermittent Backlight, BN44-00341B Power Board

          Summary for TL-DR readers:
          • Backlight is intermittent, may come on with TV boot or not. No flickering, never fails during TV on.
          • Have obtained Samsung schematic & service documents - Can upload if helpful.
          • Have read ALL applicable threads
          • C1818 and CP820 replaced as low hanging fruit
          • CN802 data taken for normal and failed BL operation. SUMMARY: Pin 2 - 5vDet = 3.52 @normal, 0.0 @BL fail. Pin 6 - EPWM = 1.631 @normal, 1.058 @BL fail.
          • VCC pin (18) of PFC...
          01-11-2023, 02:53 PM
        • triplefour
          UN65TU700DF picture and sound but no backlight. BL tests ok but repl. PSU didnt fix!
          by triplefour
          this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
          i tested the backlight with my LED tester and it lights up both strips. one of them reads 100v and the other reads 63.7v.
          unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
          according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even...
          09-13-2023, 10:43 PM
        • howardc64
          Insignia NS-43D420NA20 backlight on no display - LCD panel burn failure
          by howardc64
          Eventually discovered a burn mark near lower corner of LCD. Here is a summary
          • Backlight on, no image
          • Disconnect right buffer board (view from front), left side display comes on
          • Masked off pin 7+8 (both ~12,5v on both left and right buffer board) from t-con to right buffer board (view from front) display works but have some lines
          • Buffer board is pretty simple
          Removed the front bezel to examine edge of the glass. Found burn mark on lower right (view from front). Plastic bezel covering the burn mark region shows heat signature on the inside surface facing the LCD panel. Last 2 pics. Bright...
          07-11-2025, 04:04 PM
        • szogun
          Weird problem with keyboard backlight in Thinkpad T470
          by szogun
          I`ve bought two T470, both of them has a backlight keyboard, and in one of them (lets name it computer A) it doesn`t work.
          There is no "welcome light up" and no reaction to Fn+Space combination. My first suspect was the keyboard itself, so after checking the connectors, cleaning them na ribbons which didn`t help, i`ve swapped the keyboard as i have second computer (lets name it B)

          From now, things are getting weird.
          Both of keyboards started to work as it should. Welcome light up, switching on and off, changing brightness etc.
          Computer B with keyboard...
          10-02-2021, 02:08 AM
        • DanPoka
          Guide me through repairing a Dell p2210f LCD ccfl backlight monitor
          by DanPoka
          I bought this p2210f dell monitor to fix. Schematic is the same as p2210.
          Behaviour is that monitors comes on but then backlight switches off almost instantly. If I look with flashlight I can still find the "No signal message". So definitely a backlight issue. Trying to advance the issue I proved that the protection circuit is switching off the backlight by shorting out C3 and resistor to disable the INL chip then re enable by removing the short.
          This is where it gets interesting. When I disassembled the monitor to solder leads on c3 capacitor I noticed the backlight flickered...
          02-15-2025, 05:05 AM
        • Loading...
        • No more items.
        Working...