Panasonic TC-L42E50 42" LCD TV turns on, backlight, no picture or sound

[pixelSHREDDER]

My neighbor left me this TV because it was supposedly broken, all I knew about it was that there was no visible damage on the LCD panel itself, so I decided to give it a whirl. At first, I got the 10 blinking lights error; when I looked it up I found that it meant that one of the boards on the back was likely failing.

First, I replaced the Main Board TNPH1006 2A; after that, the blinking light went away. Now it would turn on, seem to be operating normally, but even though the backlight came on, there was no picture or sound, and it didn't seem to respond at all to the back panel buttons (other than Power).

Next I tried replacing the T-Con Board 6870C-0402C, the LG 6917L-0082C LED Driver 3PHCC2002D-H, and the Power Supply Board TNPA5608 2P (which came from a TC-L47E50, but from what I understand is compatible with my unit as well). None of those board replacements changed anything.

I tried factory reset using a third-party remote, which I can only assume had its Menu button programmed correctly because holding it down along with the Vol-Down button caused the set to reset (presumably back to factory settings, but without picture I can't tell the difference).

I'd really like to solve this little mystery of mine (and get something out of my $100+ parts investment) - does anyone have any ideas of what to try next?

[pixelSHREDDER]

Re: Panasonic TC-L42E50 42" LCD TV turns on, backlight, no picture or sound

Bump because I took off the side panels on the LCD itself and found two more boards attached directly to the panel; they're basically the only boards on the thing I haven't replaced yet. Is it even possible to replace those? Or could something else be the problem?

[tom66]

Re: Panasonic TC-L42E50 42" LCD TV turns on, backlight, no picture or sound

There is a good chance the panel is bad, as it appears to be a common fault on these - if so it would not be economical to repair (sorry)

Liquid damage is the most common way these fail, so if you've taken the panel apart already, check around the bottom of the LCD driver boards (no they cannot be replaced, sorry) for signs of corrosion, liquid etc.

[pixelSHREDDER]

Re: Panasonic TC-L42E50 42" LCD TV turns on, backlight, no picture or sound

Aw damn.... that's exactly what I found when I checked near the bottom of the panel - what looked like whitish powder in a drip pattern along the bottom. Guess that means I'll be putting my replacement boards right back up on eBay :/ Thanks for the help, though!