20 Most Recent LG 37LP1D 37 in. LCD Television - Page 2 Questions & Answers

The 3.4 should be for the microprocessor area and comes from the standby portion of the power supply-----that voltage should be on all the time so look carefully where it comes from---some sets use a op-amp IC to switch it on etc and others a relay---Like a car with no power or voltage start at the battery working outwards.With that voltage missing the set should have no operation at all.

What you most likely have is dried out capacitors in the power supply. When you un-plugged the set and everything had a chance to discharge, the capacitors in question could not charge up again, causing the problem you have. Any local service center should not have a problem repairing it. I do them all day long. It might not be very old, however, the power supply runs 24/7 as long as you have it plugged in to a live outlet. I tell customers to connect it to a switched outlet, meaning when you turn off the light switch that particular outlet is dead, creating longevity for the power supply.

I also tried re-soldering joint L781 on the main power control board (see Solutions #2 and #7). It worked. My 15 inch Dell flat panel LCD is working again, white screen gone. The solder around the pin did looked different to to the other joints...a very slight gap around the pin as though it wasn't contacting properly. To locate L781, look at the bottom of the PCB (the side with the soldering) with the power plug socket at the edge closest to you. L781 is in the top left quadrant of the board, about 2 inches in from left, 1 inch down from the top. For good measure, I also tried the solution that suggested trimming a millimeter of the end of the two data ribbons that plug into the smaller control board, although I couldn't see anything wrong with the data ribbons. I did this at the same time as resoldering L781 so not sure if it made any difference.

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i have the same problem with the closed captions... i believe to turn off the captions you have to use the remote. press the CC button repeatedly until closed captioning turns off. in my case i lost my remote so i am unable to use the method to solve the issue. Can someone please confirm that this works. so i can buy a replacement remote. Thx

If the closed caption is shaded out in the menu, this usually means closed caption is not an option. Closed caption can not be turned on if the TV is on component, RGB, DVI, Or HDMI inputs. The closed caption will need to be turned on by using the set-top box or other device that is connected to TV inputs. or if the tv is connected directly to the cable line or anteanna

Tries unplug the tv for an hour,replug it back in.Go to tv Menu,go to PICTURE,go down to resetting.The tv Tuner board should resetting it back to Factorry setting.All the HDMI setting should work now.Not,than than the Tuner board is dead.Tries websites like Shopjimmy.com Ebay.com to buy a refurbish Tuner board for the replacement.

Black screen means the backlight inverter is not working due to not haveing the 24vdc feeding it becuase of bad power supply, or the inverter board has blown fuse, short circuits, etc,
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com

could be your main power board going bad...

It seems that your unit has some sort of Video side, PSU fault, or a problem to the Video section that is shutting down the Power Supply Unit, PSU. This happens so that no further damage, and possible fire will occur.
You need to take the unit to a reputable service centre/man and ask for a firm "Quote" for the work to be done.

CHECK IF YOUR CABLE CORD IS ALL THE WAY IN AND TRY IT OR YOUR CABLE COMPANY TURNED IT OFF.