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Light screen on emerson lf501em4f

The screen is very light.I had the main board repaired.It is still very light.I did a firmware update and that added a little bit of color, but the screen is still light.I can read the menu and there is a faint picture

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Posted on Jan 02, 2017

  • 148 Answers


Impacting the television can cause the video processor to come unmounted to the main board or the LCD panel inside to become disconnected. You need to take it in for repair.

Posted on May 24, 2008

  • 70 Answers

SOURCE: Philips Magnavox 37" LCD Flat

Disconnect the LVDS Cable that runs from the small signal board to the display panel and apply power,if the screen comes on,the Small signal board (aka Scaler Bd ) is the faulty board. other than that,all that's really left that has gone bad for me is the logic board.

Posted on Jul 07, 2009

  • 6993 Answers

SOURCE: My Toshiba 26HL67 will not


The issue you describe is consistent with a power supply board issue I don't think firmware update will fix this as this is a power problem. Also, how do you intend to update the TV's firmware when it would not power on?

The problem should be from the power board of the TV. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board.

I do not think it needs replacement, rather some defective capacitors are causing this issue.
Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like ""(look for electrolytic capacitors).
After replacing these capacitor(capacitors) most likely the normal operation will be restored.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

I hope this helps.

Posted on Jan 01, 2011

  • 11361 Answers

SOURCE: I've a LG 32LC56 that

Learn about T-CON board:

PDF download:

First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board.
if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having.

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors pictures:
Learn about bad caps:
Capacitors kit: he can make you a set of caps.
Or, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.

Posted on Jun 10, 2011

  • 85 Answers

SOURCE: Does anyone have a main board for the Hyundai PTV421, or a working mcu chip(u3) on the main board?

check rear of tv look for a service socket some have a small plastic cover if you find it you could go to manufacturers site and attempt a software update

Posted on Nov 21, 2012

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Those blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
If blinks continue without any pause, the main board is faulty.
Search the site by type in the "brand name" to your device, in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

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Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts.
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

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After main board replacement, a firmware update might be necessary. If you wish to get some details; visit the site linked here. Pull up older posts. Firmware (Software) update procedure of many popular brand TVs and other devices are given in detail.

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It could be a problem with anyone of the other boards. Regrettably, you have no real clue where the problem might be. Since you have no video or audio you might just want to check out the main board.

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The main board replacement should be accompanied with a firmware update. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
Firmware (Software) update procedure to many popular brand TVs and other devices are given in detail.

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It is the symptom of fault to its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

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Here is a used but tested part I found on ebay for a great price, most others wanted 60-70 dollars but this one is 20 dollars


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