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TV was fixed just after removing Samsung's rear snap cover.
This curved TV's construction is rather interesting. When the snapped on back is removed, rest of the TV will relax the curvature. Top of LCD panel is loose as it wants to straighten out against the slightly curved bezel. Snapped back provide most of the curvature shape. So just simple disassembly of rear cover will allow the rest of the TV frame to relax its curvature. Thats probably what fixed it but no idea which connection. 4x LEDs are edge lit.
Maybe PSU->backlight connector didn't have a good contact?...07-23-2025, 12:34 AM -
Edge lit LED TV has 1/4 section backlight out. Replaced the LED bars and sharing the findings on the original 10k hour LED bar.
These are 6V LEDS (reads ~5.4+ on my LED tester) New bars read about 147V per 1/2 of each bar. Clearly original LED bar has some problems- One section is 153v with a dead LED so clearly built up resistance
- One section flickers but magically fixed itself after driving individual LEDs. All done with an LED tester so don't know if would work driven by PSU backlight circuit and how long it would last
- Connector pin to test pad resistance is nearly 0 ohms.
07-07-2025, 12:18 PM -
Failure Symptom
No picture, just red vertical stripes. Google search shows quite common problem for these recent Vizio M series although red vertical stripe pattern may differ. Some call it "Netflix" boot screen haha.
Where is the short?
Panel has 4x buffer boards. Quickly found the 1/4 panel buffer board with the problem by selectively disconnecting buffer board flex cables.
Having recently fixed another Vizio with similar symptoms that was a shorted ESD diode array ( link ) Probed the ESD diode array but... -
I’ve got this Ancel BA-101 battery tester for a few years now and discovered an issue testing flooded car batteries. The damn thing reads always low compared to other battery testers. I mean low in the tune of 25 to 30%! AGM’s read comparable within margin of error. I wonder if all these have the same problem or mine is defective somehow?...
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TV runs, backlight on, have sound and no image (dark grey/blue/black LCD)
Disconnected right (looking from rear of TV) tcon-buffer board cable, LCD left half displays.
No shorts on right buffer board.
Started masking tcon-buffer board signals... (connection #1 in main board pic) about 20+ pins from top of connector... LCD fully displays with some anomalies.
Gradually reduced # of masking signals... eventually down to 1. Removed that... LCD works perfectly.
No obvious damage on right buffer board 3x COF to the panel like another 43" LG fixed ( link ) with...
Working...
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