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LG42LD490, This is my model, the standby red light pulses when switched on, it shows the LG logo on screen only and no picture or sound, the PSU Board works, as I bought another that made no change.

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  • Carl Purchase Apr 25, 2015

    The red light keeps pulsing at same intervals, the remote control works just to put the LG logo on, there is nothing else the remote can do. It won't put which source like PC, scart or hemisphere etc.

  • shaun taylor May 04, 2015

    hi sounds like mainboard fault

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 44 Answers

SOURCE: Hi. My Philips flat TV will not show any picture

I had the Same issue. on a 50PF9431D/37 set. Many Plasma Set's use a LJ44-00118A PS-505-PH Power supply from Samsung. Known to have this common problem. If you can, or have a friend that can Solder components?. Unplug your set remove the back panel & locate your power supply. It will be the PCB in the center of the set just above the Video/Audio connections. http://www.shopjimmy.com/power-supply-unit-lj44-00118a-from-philips-50mf231d-40.htm. Is a Link to a photo of the PCB. Make a note of the locations of all cable connections then unplug them all. Un-install PCB, Check all Fuse first. I believe their is 5 or 6 of them on the PCB. Then replace the two 3300uf 10v 105C Radial capacitors at C8060 & C8059. Look to see if the Caps are deformed and or split at the top. The location of the caps are in the Lower bottom edge of the PCB. A local shop may Carrie them if not, digi-key has them. Part # http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=493-1754-ND. Total cost was $7 with S/H.

Posted on Jun 25, 2009

dsacco86
  • 1077 Answers

SOURCE: 42 LG plasma no picture but sound. found internal

Sounds like it started "Protection Mode" because of a failed electronic part inside the TV. When this happens, the TV will keep turning itself OFF or will not turn ON at all. This keeps the other parts inside from being damaged. Most likely the TV has a power supply related problem. The common part to go bad for flat panel screens circuit board that powers the screen itself. Most manufactures call it a Backlight Inverter Board.
But, I can't say what is 100% the problem because I can't actually look at the tv over the internet. I can only make guesses with the symptom.

You have a few choices:

1. Best thing to do, if you can find and purchase a Service Manual over the internet; It will help you diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you circuit diagrams, schematics, test points, and part# lists.Usually, cost under $20. Its the best repair guide material for fixing TVs. And most cases the new part cost less than $15 by searching on the internet with the part number.

2. Pay a TV shop to do the repairs. It maybe costly, but get an estimate of how much they will charge. That way you can decide if it worth repairing or replacing the whole TV.


I hope I shed some light on the subject for you.

Posted on Jul 21, 2009

  • 1 Answer

SOURCE: LG 19 LH 2000 no picture or sound

i have exactly the same problem and my tv is just 2 weeks old !!
any soloutions?

Posted on Jan 22, 2010

  • 1 Answer

SOURCE: loud pop...LG Model 50PQ30-UA Standby light blinks on/off

this **** dont mother ******* work **** ALL YALL HOES how u like that

Posted on Sep 20, 2010

  • 145 Answers

SOURCE: My LG model # 37LC2D won't turn on. The green

Hello there,

I believe the Audio/Video Inputs/Outputs could be going out .

If you are using the HDMI try the Component cables and connections or AV cables with the S-video

if you swap the cables around and the problem is still there let me know and we try a few more steps thank you and don't forget to Rate

Posted on Jan 26, 2011

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1 Answer

LG symbol on screen flashes on once and red light blinks twice slowly, no sound either. What does 2 blinks indicate ? please advise


Corrupted firmware. A firmware update is necessary. 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://electronicshelponline.blogspot.com/

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Sounds like main digital board fault. 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://electronicshelponline.blogspot.com/

Sep 06, 2015 | LG Televison & Video

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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...

1 Answer

TV turns on to splash screen LG logo, but won't boot any further. Red LED light pulses at the bottom of the TV, but never fully 'boots up' to the Blue LED light.


Sounds like corrupted firmware. A firmware update is necessary. Get the latest firmware, and update it. Contact the authorized service center to get the latest one. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Dec 03, 2014 | LG Televison & Video

1 Answer

Lg led tv has sound but no picture


suspect either a back light power board issue or main power board to back light board issue...also, is it under warranty ?

Dec 28, 2013 | LG Electronics 47LS4600 47" LED HDTV

1 Answer

Red standby light come on,the sound only comes on,.


means the backlight on your tv is out, if you shine a torch to the tv when its on and giving sound, do you get an outline of the picture? if so then probably the inverter board or the psu is bad,check for bad caps

Dec 09, 2013 | Televison & Video

1 Answer

Hi there, i have a baird lcd model j047baird\r\nthe fault i am having is, it stuck in stby. power supply look fine all voltage is there. if i disconnect the lead j5 from main board to invertor the screen...


there is 2 problems that makes this tv have standby fault.. so here they are,!

1.)main av board ---the 8 leg eeprom loses programing just under LVD CABLE TO SCREEN -£14.99 from a guy or if you can program yourself 4.99 for the flash to reprogram,.

2.)POWER SUPPLY FAULT IS MLT199TL PSU. (UA4)AREA, SG3525AN (16 leg) Regulating pulse width modulator.

the first fault all votage at psu will be there ,, 5v / 12v / 24v

the second fault psu will have 5v standby but no 12v or 24v this will stop the secondary from fireing up.. hope this helps.

Jul 31, 2011 | Televison & Video

1 Answer

Toshiba 32wd98b


Hi
Problem is probably PSU REGULATOR, STRF6668B.
I wouldnt recomend you repairing this yourself as there may be other components that will require checking.
You could end up blowing the replacement regulator.

http://dysonmanuals.llc.nu/

Apr 12, 2008 | Televison & Video

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