Hi all, Im also having trouble with some double sided tape and a bezel-less LCD. I ordered 3M VHB tape - although I did order it from ebay.... It was incredibly stretchy and didnt stick well at all. Is it likely that I just got fake crap quality tape? Is there any other comparable tapes I can look at? (Tesa, etc) as Im having trouble getting a small qty of 3M VHB tape from any reputable retailer here. My other option is try try and glue it with T-7000 glue; does anyone have positive experience doing this on a bezel-less screen?


Thanks

Baz...

Hi all

Just to tidy this up, and to potentially help someone else in the future..... I went ahead and ordered a new power supply board, and that fixed my problem.

Im just waiting on some 3M double sided tape to arrive so I can properly put everything back together. Can anyone suggest what I should use to fully remove the old double sided tape residue from the back of the LCD panel? and what process I should use to clean the back of the PCD panel and the backlight diffuser so that I dont have any marks inside the screen?

Cheers

Baz...

Hi all

I finally had some more time to do some further investigation - disassembled everything again so I could get to things fully. My TV has 2 separate LED strips, each with 92 LEDs. Looking at the circuit diagram, and by testing, each of the 92 LED strips has 4 individual strings of 23 LED's. I managed to light each string individually by jumpering the different pin combinations through. In each case when I checked current readings they were somewhere between 0.4 and 0.7 mA as it "warmed up", and then settled around 0.5 to 0.6. The LED's were all lit, but to my eye...

Its only a cheap UNI-T meter, but its definitely DCA - was a pain in the butt to get those measurements as I ended up taking them between the ribbon cable traces and the terminal header. I might have another look at them later to triple confirm - but thats why I checked 2 separate lines...

You can certainly see the backlight, as the construction of this model has a solid piece of glass as the chassis, with the white "diffuser" panel simply fixed to it with adhesive, and the LCD panel fixed in front of this (all just with double sided tape). I still have the LCD panel loose...

JohnCT[USER="245503"]JohnCT[/USER] and for what its worth, the TV is actually 3 years old now - because its been sitting under a bed for the last 2 years forgotten about!

I checked both ribbon cables and they looked pretty good to me - nice and clean and all the contacts looked in good condition.

I also managed to check current readings on 2 different lines, however I only read 0.5mA (on both). Assuming my readings are correct (Im pretty sure they were well connected and stable), theyre obviously incredibly low - but enough to light the LED's?

I also isolated the power supply board from ground, and that made no difference.

Would you have any suggestion from this point as to whether it would likely be a power supply board...

Thanks for the fantastic info [USER="245503"]JohnCT[/USER] I havnt had a chance to get back to it today but I will check the currents and see whats happening. The TV came from my in-laws; long story but it was a warranty claim that was written off when it failed after 12 months - around the same time that Panasonic pulled out of the Australian TV market. The in-laws got a full credit refund and bought a Samsung TV instead. They were watching it one day and it just went dark. They left it for a few hours turned off and then restarted it and it worked for a session, but since then...

Hi all

While I have quite a decent background in electrical & electronic troubleshooting & repairs, this is my first time stripping down an LCD TV for repair.... I have inherited a 3yr old Panasonic LCD which has a picture, but it is quite dark (too dark to be watchable - but still quite easy to see; I didnt need a torch to see it).

I started by checking and trying to adjust all of the picture and backlighting levels, but that made little to no difference. I also did a factory reset.

From there I envisaged that the backlighting wasn't working, however...