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Hitachi le49a509 led tv black screen. I can see the menu screen with a flashlight test. There's 3 boards in the back. Tcon, power supply and main board. Which is the problem?

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  • Hitachi Master
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Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Posted on Dec 04, 2016

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6ya6ya
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Posted on Jan 02, 2017

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caroldon
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SOURCE: lg lcd can a bad tcon board kill all power

Yes , it can be a short on the board that will ask the SMPS unit to protect the power so as to switch off. So even with a multi-meter check you will be able to trace the short on the board, the drivers or any capacitor that is cutting off the power which must solve the issue.

Posted on Dec 15, 2011

gopakumarg43
  • 74198 Answers

SOURCE: lg led tv backlight

Fault with 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. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Posted on Feb 05, 2015

Terry Corrow
  • 10875 Answers

SOURCE: I have audio but. No video on my vizio model e47oiao I've seen where there is a led board but my tv only has power supply board and main board using a.flashlight I can see the menu board any ideas

if you dont have any clue,take it to someone that does or damage your tv

Posted on Mar 26, 2015

skippy101
  • 143 Answers

SOURCE: I got a 55 inch Samsung flat panel tv model # UN55D6000Sf Version H302 with standby light blinking 1 time in repeat. I have changed the power supply board, main board & tcon board but still no luc

since you have replaced the main parts in the tv already it is safe to say you have bad led strip these can be tested with a 12v dc power supply

Posted on May 30, 2015

claudeinmo
  • 9098 Answers

SOURCE: How do I fix my Samsung 40 LED TV that has sound but no picture?

Samsung 60-Inch 1080p 120Hz Slim Smart LED HDTV ...

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Posted on Oct 16, 2015

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1 Answer

I have a LE49A509 Hitachi Television that will turn on but the screen is black. At least the blue light comes on and stays on but no picture at all. What is wrong and how can I fix it


Do flashlight test to see if you can see a picture. If so the issue is with the tcon board. If no picture with flash light issue is with the inverter board that powers the led's.

Aug 26, 2017 | Hitachi Televison & Video

1 Answer

Samsung UN65EH6000FXZA (Version YH02)


There is three possibilities:
1. Defective back lights LED strip.
2. Defective LED driver section integrated in the main power supply.
3. the main board.

How to check it:
1. You need a LED back lights tester to check the strips, or open the panel, use a 3.7 V DC power supply to test each LED diode separately.
2. Use a multi meter to test the out put DC voltage from the connector to the LED strip between the + & - for each section, (like 1+/1-, 2+/2- etc.) it should read 140 - 220 V DC. (need power up the TV).
3. Un-plug the cable between the main board & the power supply, power up the TV, if you get the back lights light up, the main board is bad.

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Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

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1 Answer

Hitachi led tv no picture but has sound


hi, the led or leds in the panel may shorted, thanks

shaun

Feb 12, 2017 | Hitachi Televison & Video

1 Answer

Hitachi le55a6r9a has audio but no picture. When you shine a flashlight on the scree, you can see a dark image. Which piece needs to be replaced?


Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Feb 07, 2017 | Hitachi Televison & Video

1 Answer

LED TV has sound but no picture?


Sounds like it can be because of the faulty LED's. The LED is drawing over current for the power board that's why the fault arise again. There would be no fault in main board or the TCON board.
If you wish to get some details; check the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/

Jun 03, 2016 | Televison & Video

1 Answer

No picture on tv but does have sound


Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electro-medical.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

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