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LG 42LD520-UA does not show picture, but sound is working fine. This behavior is not consistent.

I have LG 42LD520-UA TV for more than six years. It was working fine till now, from last couple of weeks, the TV does not show picture (most of the time) but sound is perfect and you can perform any remote function, can switch channel, change input settings, cast from a device. The power LED is off when TV set is off. When I press the power button, the power LED blinks to red, and then to blue, and nothing on the screen. You don't see the LG logo and date/time screen either. You can hear the sound, and the back light on the set is on. But if you keep the TV set on for 30 minutes, and then turn it off. Wait for few seconds and then turn it on, the TV will turn ON, and this time you can see the LG logo. There seems no problem to display. No flickering, no blackening, or any sign that picture tube is going to die. Any help is appreciated. Best regards Thanks for the prompt reply. I just wondering why this behavior is not consistent. .

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If you have sound then you have to go through the flashlight test which is the first step in the blank screen fault with sound. If video is fine then you have to test the LED Backlight supply voltages if your are familiar and good in the electronic repair. First you have to check if bulging capacitors in the LED Backlight drive voltage circuit, replace them which most probably the reason when you turn it OFF & ON after keeping the TV ON for 30 minute. In case if capacitors are good then you have check the backlight LEDs which most probably not required in you case as you can see the logo by switching OFF & ON after 30 minutes operative. Attached videos and links may help you for the repair and replacement of backlight LED strips or LEDs itself depending on the type of LED strips used in your model. https://www.youtube.com/watch?v=Z1DEkSguWtg
https://www.youtube.com/watch?v=YgaL6X6eSaU
https://www.youtube.com/watch?v=EZVQKEp6jxk
https://www.youtube.com/watch?v=T2FboV-1PJg
https://www.youtube.com/watch?v=2pyuXwNkBMA

Posted on May 10, 2017

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Posted on Apr 23, 2017

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ELECTREPAIRUSA@ELECTREPAIRUSA.COM

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http://electronicshelponline.blogspot.com/

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I have an LG 22LG30-UA monitor that I would like to use to show PPT via the USB port. Can this be done? The USB port says "Service Only"


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The manual for the LG 22LG30-UA is available from the product support page: http://www.lg.com/us/support-product/lg-22LG30-UA . Scroll down to the Manuals section The direct link to the manual is currently http://www.lg.com/us/lgecs.downloadFile.ldwf?DOC_ID=KROWM000189658&what=MANUAL&fromSystem=LG.COM&fileId=KROWM000189658.pdf&ORIGINAL_NAME_b1_a1=eng.pdf .

I hope this helps.

Cindy Wells
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1 Answer

I have an LG 42LD520-UA and it doesnt do anything no lights nothing just wont turn on


AC out is good? Otherwise check the main AC fuse on the power supply module, see picture here:
http://assets.shopjimmy.com/media/catalog/product/cache/1/image/5e06319eda06f020e43594a9c230972d/s/j/sjeay60990201.jpg

The fuse is located on the top right (white cylinder with red band), the fuse is soldered in.

Parts for your TV;
http://www.shopjimmy.com/catalogsearch/result/?q=LG+42LD520-UA

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:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
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
Parts: www.shopjimmy.com
Parts: www.interliquidparts.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.

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1 Answer

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