Can a bad power board in a samsung tv cause flickering in the screen?

If your QN75Q60TBFXZA screen keeps flicking and cycling, it could be caused by a few different issues, even if you already changed out the CPU board:

1. Check the power cable to ensure that it is securely plugged in and that the outlet is working properly.
2. Check the cable connections on the back of the TV to ensure that they are all securely plugged in.
3. Check the power supply to ensure that it is functioning properly. If the power supply is faulty, it can cause the screen to flicker and cycle.
4. Check the main board to ensure that it is functioning properly. If the main board is faulty, it can cause the screen to flicker and cycle.
5. Check the power supply cable connection to the main board. If the cable is loose, damaged or not properly connected, it could be causing the issue.
6. If the problem persists, consider contacting Samsung customer service or a technician for further assistance.

It's important to note that screen flickering and cycling can be caused by a malfunction or damage in the power supply, the main board or even the backlight. It's also important to check that all the connections are secure and that no damage has been made to the cable or the board during the repair process.

HI Ray....unhook the plug going from the power to main board and see if you get backlights when you plug the set in, if you do chances are you have a bad replacement main

I'd look at a bad panel, the defective panel damaged your main, replacing that got it working somewhat but if it's on very long I'm guessing you will damage the main board you replaced. Try unhooking the ribbon connectors one at a time and see if half the picture works ok, if so you definately have a bad panel

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This is a power supply and/or possibly inverter(s) board bad capacitors. Since the audio is affected it could be both. Be aware that attempting to repair it yourself could cause irreparable damage to your TV.

When the screen flickers on and off it usually comes from the power supply or backlight inverter being bad. For your TV, the backlight inverter and power supply unit are combined. As you can see in the picture attached it's the white part on the right side that has gone bad. You will need to replace that board. LN40B550K1F Samsung LCD TV Repair Guide

the problem with these sets (all brands) is it could be any board in the set or even the panel used for the display---

The screen flicker than go blank,does it still have power to the tv set?Yes,than this cause only can be causes by only 2 boards in the tv can causes this problems,if tv power still stable for the set.The T-CON board it shorting out and dying for this problems to happen or worst case causes the Main board tv Tuner signal board it dying.The T-CON board the priced it is cheaper and could cause this problems too.Tries change this T-CON board first,see what happen.This board T-CON board sit at the bottom in the middle of the LCD screen panel to decodes pictures pixel before it go onto the LCD screen panel.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish T-CON board for the replacement.

This tv seem to have two problems.The problems that the tv take a long time the tv to turn on,the tv power supply board have dying capacitors most likely.That the board where the power a/c cord plug into it.The picture flickers badly this problems is harder to determine because this causes by two backlight buffers boards X,Z buffers boards could be either one it is dying.This tv should get an estamate by a shop or shops and repair it by them,bcause the tv must have to be doing replacing x munbers capacitors components to the tv power supply board and alot more work to trouble shoot and to detrmine which of the buffers boards it is the causes of to the picture screen to be badly flickers and replacing it.

I had the same issue occur on my ln55c650 and they had to replace the power supply pc-board. Seems some issue with power module in the TV rather than the side panels. Luckily for me, TV was still in warranty.