LG 50LA6970-ue tv picture keeps coming on and off yet audio is fine

[akobtan]

Hello everyone,

I have a 50LA6970-ue lg tv. With any kind of input (antenna, hdmi, etc..) the audio works fine, but the image keeps turning on then going black then coming back on then going black, etc.. This cycle of image coming and going keeps happening as long as the tv is on. I checked removed the backcover and checked the backlights while the tv is on, and nothing happens to them even though the problem is still there on screen. I measured the 3.5, 12, and 24 voltages from the power board and they all seemed fine. I tried changing the tcon board with a new one, but the problem is still happening.

I am a newbie DIYer, but in my humble opinion I suspect the problem is very different from normal panel issue symptoms I see online, and I have a feeling there is something else at work here that could be more easily fixed. From what I read, panel issues are not worth fixing due to cost and unavailability of gear for a DIYer.

I can create a video of the problem if that helps. I would appreciate your guidance on this issue.

[nomoresonys]

Re: LG 50LA6970-ue tv picture keeps coming on and off yet audio is fine

Test the voltages at the connector on the powerboard with EVERYTHING hooked up, it's the connector that the cable from powerboard to mainboard hooks into, most times there's a legend/map nearby that gives the expected voltages, you measure them with your mutimeter, set meter to 20 vdc then report them, put neg probe on chassis metal ground, pos probe on pin of connector, measure in standby take note, leave probes where they are then power on tv and again take note of voltages, report them here, example pin 1-ps-on-0 volts standby-power on-3.3 volts.