Samsung tv cycles on and off. Replaced the Y main or Y sustain and it didnt solve the problem.

Did it work with the Y-sustain board replaced? Likely if it did not work then there is an issue with the capacitors on the Y-sustain board and the power board. Check these caps for failure and replace them with the exact type. Likely the caps are blown and cause voltage loss in one or both boards.

At first review of your problem the first thought occurred to me is that it may be a bad main/power supply...not familiar with new tv's but wondered if it was a simple as replacing a wire or something. You have said you replaced the main board. At first I didn't think that was necessary but apparently it's a fairly common course of action. That seems like a lot for a faulty power switch...but there's more to it than I realized. I found this excellent youtube video with some expert instructions on how to resolve, hosted by shopjimmy.com; you have referred to this source & I'd suggest it's about the best that's out there to find solution to your situation...seems something isn't switching over right & the tv clicks several times then goes into standby...thereby have to replace the faulty ??? I'd say capacitor but now adays the composite of the boards are alot different. This video link is the best solution. I hope it helps https://www.youtube.com/watch?v=n54IurMvr6o

On lots of Samsungs, the Y-board controls the picture

Hi Doug Rudnik,

First of all thank you for contacting Fixya.com regarding on your TV problem.

You've mentioned that you can hear a sound for 1 sec and then the unit immediately turned off and there's a constant red LED lit. The symptoms you've described indicates that the main board of your unit is working fine and it automatically shuts off because it sensed malfunction on image boards. The constant red LED means that it is on standby mode only.

Now, since you've replaced the power supply board but still the symptoms persist, then the suspect is either the X or Y sustain board but high chance that the fault came from the Y sustain board based on my experienced. Y sustain board is located on the left side of your unit while the X sustain board is on the right side if you are facing the rear cover. These boards has a ceramic fuse(white color) and pico fuse(looks like resistor), please check the continuity of the fuses to determine which board gone to malfunction. If you found an open fuse to Y-sustain board then you need to replaced it. Blown fuse means that the circuitry on its line gone to excessive current.

I would advice you also to inspect the electrolytic capacitors on these boards. Most of the time loud pop came from a blown capacitor and has a physical indication of fault like bulged/dome at the top and can be easily identify through visual inspection. It can give you an idea also which board gone to malfunction. See sample picture below of faulty electrolytic capacitor with bulged dome at the top.






Here's the link for X and Y sustain board.

Y sustain board

X sustain board



Hope I've gave you an idea what's going wrong to your set.

Have a nice day and take care!

Kind Regards,

Jdvillanueva

Hello,

Problem is in either power supply or the Y-Sustain board.

The Y-Sustain is a relatively large board out of which go connections to the side of the display; it's therefore closer to either the left or the right side of the display, has at least one rather large heat sink on it and fat power cables connecting it to the main power supply.

Often there are fuses on that board - one or more. Check those.

if they are blown you can try to replace them, but expect them to blow again - usually the whole board needs to be replaced.
Hoping this will help in solving the problem......

Hello,

Problem is in either power supply or the Y-Sustain board.

The Y-Sustain is a relatively large board out of which go connections to the side of the display; it's therefore closer to either the left or the right side of the display, has at least one rather large heat sink on it and fat power cables connecting it to the main power supply.

Often there are fuses on that board - one or more. Check those.

if they are blown you can try to replace them, but expect them to blow again - usually the whole board needs to be replaced.

Good luck in solving the problem....

Hello,

Problem is in either power supply or the Y-Sustain board.

The Y-Sustain is a relatively large board out of which go connections to the side of the display; it's therefore closer to either the left or the right side of the display, has at least one rather large heat sink on it and fat power cables connecting it to the main power supply.

Often there are fuses on that board - one or more. Check those.

if they are blown you can try to replace them, but expect them to blow again - usually the whole board needs to be replaced.

Good luck in solving the problem also be careful in handling the set because it contain high voltage....

Hi,

You can solve this type of problem by opening the television, but caution must be taking to ensure proper troubleshooting, because the panel contains high voltages.
Problem is in either power supply or the Y-Sustain board.

The Y-Sustain is a relatively large board out of which go connections to the side of the display; it's therefore closer to either the left or the right side of the display, has at least one rather large heat sink on it and fat power cables connecting it to the main power supply.

Often there are fuses on that board - one or more. Check those.

if they are blown you can try to replace them, but expect them to blow again - usually the whole board needs to be replaced.

often that needs to be done in a service center as there are some adjustments to be made after replacement.

Hope this will help in solving the problem....

Scott,
Not at all crazy! The Samsung/Akai lines seem to have numerous problems with their Y and Z sustain boards and upper/lower Y driver boards (aka buffers). That and power supplies are generally the largest percentage of the problems in those units. That said, I'm a bit confused looking at the p/n you referenced. I don't see that as being a Samsung number belonging to a Y-sus board. Usually they start with BPxx-xxxxxx..
Lastly, while you might have every ability to replace the Y-sus board if the buffers are bad and you don't replace them you could simply burn up the sustain board when you power it up... Installing the buffers is a bit more complex than the sustain board so be really careful there...\
Good Luck
Bill