Well, finding this site is somewhat discouraging since it seems like this power cycling issue is fairly common for any brand of flat screen TV's no matter what model. But, I still want to see if it's something that I can fix. I'm a retired software hack so my hardware skills are limited, but I am mechanically inclined and I can solder PC boards when necessary. Testing is limited to a multi-meter at this point as that's all I have.
I've been going through dozens of threads on this topic for different TV's. It seems that most of the time, the problem is with the panels themselves, but I'm hoping that's not always the case. Here's what I've tested so far:
Samsung UN55KS800DFXZA ver. AA02
Power Board: BN44-00878A (on board)
Main Board: BN94 10960Y (on sticker)
1. Power board - connected only to the backlight, main board disconnected. Backlight stays on while plugged in.
2. Power board - connected to the backlight and main board. All other connectors on the main board disconnected. Power cycling continues again.
3. I've just begun to take measurements off of the connectors on the power board so I don't have that data just yet.
4. Reseated all cables and visually inspected them for burns or damage, with nothing found. Also, visually inspected both boards without finding any obvious burnt parts ore bulging caps.
This lead me to believe that the problem is not the panel, but one of these boards and most likely the main board (or firmware on the main board). It doesn't seem like it's a panel problem so far, but I haven't taken enough off to see the LED strips, etc. Does this sound like a more likely scenario than a bad panel?
I'm still continuing my investigation and learning along the way, but I wanted to see if my thinking is on track or not.
TIA
I've been going through dozens of threads on this topic for different TV's. It seems that most of the time, the problem is with the panels themselves, but I'm hoping that's not always the case. Here's what I've tested so far:
Samsung UN55KS800DFXZA ver. AA02
Power Board: BN44-00878A (on board)
Main Board: BN94 10960Y (on sticker)
1. Power board - connected only to the backlight, main board disconnected. Backlight stays on while plugged in.
2. Power board - connected to the backlight and main board. All other connectors on the main board disconnected. Power cycling continues again.
3. I've just begun to take measurements off of the connectors on the power board so I don't have that data just yet.
4. Reseated all cables and visually inspected them for burns or damage, with nothing found. Also, visually inspected both boards without finding any obvious burnt parts ore bulging caps.
This lead me to believe that the problem is not the panel, but one of these boards and most likely the main board (or firmware on the main board). It doesn't seem like it's a panel problem so far, but I haven't taken enough off to see the LED strips, etc. Does this sound like a more likely scenario than a bad panel?
I'm still continuing my investigation and learning along the way, but I wanted to see if my thinking is on track or not.
TIA
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