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Model # CN55XB7250 T201707015A I REPLACED VIDEO & T-CON BOARDS STIL HAVE BLACK SCREEN. (ALTHOUGH I DID HAVE A QUICK FLASH WHEN U REPLACED THEM, NOW NOTHING) I WAS TOLD TO CHECK INVERTER BOX... HOW AND WHERE IS THAT?

Posted by Donna Jo on

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Brad Brown

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  • Televison & ... Master
  • 18,438 Answers

Who makes that unit? There is nothing on the model number.

Posted on Jul 30, 2020

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5 Related Answers

coyotedave

  • 280 Answers

SOURCE: Soyo 32'' power supply is good checked it in another tv

Check caps and look for fuses there should be two.. Check continuity on transformers and if you find one that is open that's it. You can sometimes replace the transformer with one from another board. don't have to be same brand..

Posted on Mar 27, 2009

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Jonathan Larson

  • 130 Answers

SOURCE: dell 2005fpw flash problem

Often this is a capacitor problem, there have been many problems with them as of late. http://www.badcaps.net/forum post here and they will be able to help you out.

Posted on Jun 12, 2009

Tyler Bearor

  • 367 Answers

SOURCE: screen flashes on blue then goes black, sound ok.

Are you still having trouble?Please let me know.Thank You very much!
Tyler

Posted on Oct 07, 2009

welcomejee

Shahid Electronics

  • 10594 Answers

SOURCE: The standby light just

Hi,
Standby light would be flashing for few times then pause/ stop for three seconds and again flashing.
How many times standby light flashes in this tv?
Count its flashes and let me know to provide you info about possible cause of problem.
Thanks.

Posted on Nov 23, 2010

eagle338

eagle338

  • 4889 Answers

SOURCE: right side of samsung ln52a580p

This is not an issue with the main board . Its a clear case of faulty LCD controller board or the LCD panel itself is faulty(most likely). I suppose the sound is not affected?

Posted on Feb 15, 2011

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1 Answer

Lg tv blink codes


Take the screen off connect power and watch LEDs if any don't flash its LEDs only needed to change faulty strip if they all flash its probably t con boards.

Oct 28, 2017 | LG Televison & Video

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Tv problems lg and vizeo


Power Issues Troubleshooting
*NOTE* LG & Vizio TVs must be plugged in for 5 minutes before it will turn on*
1. Inspect ALL Ribbons and connectors. Any tears or bad connections between boards must be replaced FIRST
2. If you have any of these boards, it should be the first board to be replaced
A) T-Con Board - Video Problems (No Video with standby light on, audio but no video, grainy, distorted, or color problems in screen)
B) X or Y Buffer Board (Plasma TVs only) - Standby light is on but no power
C) Backlight Inverter / LED Driver - No Video with standby light on
3. Main Video Board
- Standby light is on but no power
- Either video or audio does not work (if no T-Con in TV. If audio but no video it is T-Con)
4. Power Board - No power AND standby light does NOT turn on. If standby light is on try other boards above
5. Panel - No power, distorted picture, lines, slow motion, half screen, faded in / out. Panel problems are usually not worth replacing the panel.

on May 22, 2015 | LG Televison & Video

1 Answer

Samsung smart tv no picture and sound. Replaced T-CON and Main Board. Same result. Any ideas?


did you change power supply? how many times does light flash (red) you didnt change the power supply did you use a vom on connections?

We Are Here To Help !!!
Donal Deane MCSE,ASE,CPO

Aug 18, 2017 | Samsung Televison & Video

1 Answer

I have a LG LED TV 55LS4500UD that no longer works after a storm. It won't turn on and no standby light. I have pics of the circuit boards. I would like to know which board to replace?


Power Issues Troubleshooting
*NOTE* LG & Vizio TVs must be plugged in for 5 minutes before it will turn on*
1. Inspect ALL Ribbons and connectors. Any tears or bad connections between boards must be replaced FIRST
2. If you have any of these boards, it should be the first board to be replaced
A) T-Con Board - Video Problems (No Video with standby light on, audio but no video, grainy, distorted, or color problems in screen)
B) X or Y Buffer Board (Plasma TVs only) - Standby light is on but no power
C) Backlight Inverter / LED Driver - No Video with standby light on
3. Main Video Board
- Standby light is on but no power
- Either video or audio does not work (if no T-Con in TV. If audio but no video it is T-Con)
4. Power Board - No power AND standby light does NOT turn on. If standby light is on try other boards above
5. Panel - No power, distorted picture, lines, slow motion, half screen, faded in / out. Panel problems are usually not worth replacing the panel.

Apr 11, 2016 | LG Televison & Video

1 Answer

Tv repair.for plasma tv


No screen boards found. Do you mean any of these?
Types of TV Boards Every TV uses a collection of various boards to perform every function imaginable in a television. The boards work together to produce sound and images on a television screen. When certain mechanisms in a TV fail, it might be time to start testing different boards to see if they are functioning properly.

Main Board

The main board is the central hub of a television circuit system. The easiest way to identify a main board is to find the board with the various video and audio inputs/outputs. Generally speaking, main boards also contain a tuner, HDMI, USB, and S-video port. Main boards are one of the largest boards in a television. Main boards might also be referred to as a motherboard, main module, or an A/V board.

Power Supply Board

Another large and important board inside a television is the power supply board.. Usually found in the center of the TV, the power supply board has several connectors that supply power to the other circuit boards. It can contain transformers, large capacitors, and integrated circuits. There is usually a table on the power supply board indicating the different voltages it produces in addition to the signal names.

Inverter Board

Found on LCD TVs, inverter boards are used to mount the LCD backlight. These are smaller boards, usually shaped like long thin rods. If an LCD TV's screen is dark, distorted, or difficult to see, it can be the result of a defective inverter board. Inverter boards fail when inadequate power is not allowing current to pass through the backlight bulb.

Timing Control Board / Logic Board

The timing control board, known as the T - CON board,, is typically only found on LCD and LED TVs. Plasma TVS, on the other hand, use a logic board.. The functions of the logic and T-CON board are similar, as each functions to digitize the information it receives from the TV's processor. This allows the screen to display images on the pixel level. When the T-CON or logic board fails, the screen images may become distorted, leading to pixelation and the appearance of lines on a television. On a logic board, there are slotted connectors on all four sides, while T-CON boards have connectors on just two sides.

X-Sustain and Y-Sustain Boards

Also known as the X-SUS and the Y-SUS, the x-sustain and y-sustain boards only appear in plasma screen TVs. The x - sustain board might also be called the Z-SUS. These boards function similarly, producing proper screen images. Although they serve pretty much the same function, the two boards work independently of each other. The x-sustain board activates all the display lines at once, while the y - sustain boardaddresses all the individual lines of display. When one board breaks down, it probably will not affect the functionality of the other. However, it might be a good idea to have both replaced because X-SUS and Y-SUS boards have a relatively short life span anyway. A failure of one could mean an impending failure of the other.

Buffer Boards

B uffer boards are also only found in plasma screen TVs. Connected to the y-sustain board, a buffer board works to turn output to the plasma display. Common defects of buffer boards include the burning and shorting of power lines.
TV Boards Buying Guide

Nov 28, 2015 | Hitachi P50H401 50 in. Plasma HDTV

2 Answers

LG 50ln5200-ub led TV . Has no picture but great sound . What is the problem ? I did the flashlight test and can see the faint picture which tells me the backlighting is out . This tv model is a Black...


usually bad power supply, Where did you source your part? return/exchange it. Bad LEDs/ possible but not as likely, Tcon working if you can see images with flashlight. You must also have backlight on signal from main board ,check for 3 to 5v on labeled connecter on power supply. UPDATE---47" & 50" LN series. This model has had LED problems if your TV acts as described by Mr. Hughes in is answer to this problem you have bad LEDs

Feb 16, 2015 | LG 50 Inch LED TV 50LN5200 LN5200 Series...

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