Question about Sharp AQUOS LC-37D40U BACKLIGHT INVERTER BOARD PN: IM3826-1

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I have a sharp LC-37D40U that will not power on. The power light blinks 1 time every second. I held the input and volume - button while plugging the TV on and the TV cuts on and then cuts right back off, no buzzing sound is heard at all. I believe it is either the lamp or the inverter board by researching this site. How can I test which component is bad or just continue troubleshooting from this point?

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OK if you have blinking red light.

Try to open the cover then disconnect the inverter board after that try to power it on again..

If the light stays in blue (LIT) and of course you don't have picture or backlight you have faulty inverter board that need to be replace.

Posted on Nov 08, 2012

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 8457 Answers

SOURCE: power light blinking green and cannot turn off or display anythin

power inverter board is dead.
need a new one.

Posted on Sep 14, 2009

eagle338
  • 4889 Answers

SOURCE: I have Sharp Aquos LC-65D64U

It sounds like a backlight inverter to me. I am 99% sure. The buzzing noise you mentioned kind of confirms that, so does the backlight turning off. If you want to test them, then you are gonna need a multimeter. I will see if I can find a schematic in my collection, but be aware that this is a highvoltage device we are dealing with. May not be a good idea to test it yourself if you have never worked on electronics before. The sets hold nasty voltages for several days after its turned off and unplugged, and can injure you if you are not careful. I don't mean to scare you but its my job to tell you. If you want to proceed then I'm game.

Posted on Nov 01, 2010

vernonallen5
  • 134 Answers

SOURCE: I have a Sharp LC-46E77UN

THe problem is in the set top box. Or common called the tuner box. IT looses the 5 volts to the main display and thus the monitor will go into a shut down state. THESE boxes are factory repair only and must be sent off to repair.

Posted on Feb 20, 2011

40longyears
  • 275 Answers

SOURCE: Sharp Aquos LC-37d40u made a

That sounds like a dead power supply. Smell it to see if it stinks like it overheated.
There are 4 13v connector pins that can be spliced into from one standard spliced wall wart.
Common is negative if you study the mobo by scratching off the paint. Both fuse tracks for instance are positive, there are two more positive pins.

Posted on Feb 22, 2011

budmrtn
  • 11361 Answers

SOURCE: I am currently working on a Sharp Lc37sb24u. I was

Did you check the service manual troubleshooting guide yet. You can try disconnecting the power to the inverter board and see if it will stay on and have sound.
Service manuals:
http://elektrotanya.com/?q=showresult&what=Sharp%20LC37SB24U&kategoria=&kat2=all

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

Posted on Oct 27, 2011

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1 Answer

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These 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.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
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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How do i locate which lamps/inverters are bad?


If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/

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1 Answer

No picture on TV


Not sure if you saw Tom's Guide
at Sharp lcd tv power button flashing

(1) 4tinyhearts said:
I unplugged the TV and held the buttons down and it continued to flash. I continued to hold down the two buttons and replugged it in again and it worked. TV back up and working.

(2) lastditcheffort said:
Unplugged it. After looking for a new tv online I decided to try getting it to work. So, plugged it back in and held down the power button, a red light came on, held down the power button again and an orange light came on, held down power button again and green light came on and tv powered on. This was simply a case of trial and success!

(3) Nateinportland said :
unplug, hold power button, plug in. If that doesn't work, unplug all the HDMI cables, unplug the power, hold power button, plug back in.

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How many times do this standby light blinks at one time switch On? Count it carefully. These are called blinking codes, and from the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit stage inside the TV. If you wish to get more details about these blinking codes, check this link.http://electronicshelponline.blogspot.com/
Pull up previous posts by its left sidebar, or type in the brand name and model number to of your set, to its search box, and press 'Enter' or view it in Mosaic / Timeslide option.

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1 Answer

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1 Answer

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Good Day, texxastam;

Do this:

1. UNPLUG TV
2. HOLD IN VOLUME DOWN &INPUT buttons on TV
3. Plug in the TV. (the TV will turn itself on).
4. A blue "K" should now be showing on the TV screen, release the buttons.
5. Press and release the VOLUME DOWN & CHANNEL DOWN buttons simultaneously on the TV. (A blue service menu will appear on the screen).
6. Using the remote, press the DOWN SELECT button once. (The highlighted line should read INDUSTRY INT (+CAUSE) OFF
7. Using the remote, press VOLUME UP once (OFF changes to ON).
8. Press ENTER. After a few seconds the screen turns green and shows - Industry INIT success - at the top of the screen.
9. Unplug the AC cord for 10 seconds then plug back in.

Good Luck, big IRISH.

PS; I did not make this up... it's from SHARP> again good luck...you may have to do this several times....too...get the timming down.

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you can try resetting the tv by
1. unplugging it
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3. if you here a click, the tv has been reset

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