Sanyo DP46840 - Right side of screen darker than left, horizontal lines on bottom

[Zudo00]

Hey there, i have a Sanyo Dp46840 that I got from my neighbor. It has two problems. The first being that the right side of the screen is darker than the left and the second being that it has horizontal lines running through the bottom half of the screen. I've taken it apart and checked the t-con board and reseated all connections and that didn't seem to fix it. Should I try a replacement T-con board? Another thought that it may be the backlight converter, but I am not entirely sure.

[nomoresonys]

Re: Sanyo DP46840 - Right side of screen darker than left, horizontal lines on bottom

tcon might be worth a shot, if you can get one cheap enough.

[johnboy1313]

Re: Sanyo DP46840 - Right side of screen darker than left, horizontal lines on bottom

It's the panel. All DP46848s are junk.

[Zudo00]

Re: Sanyo DP46840 - Right side of screen darker than left, horizontal lines on bottom

Alright, reseated everything, dusted everything and I do mean everything, down to the backlight inverter and now the horizontal lines are gone but the dark on the right side is still there.

[drussell]

Re: Sanyo DP46840 - Right side of screen darker than left, horizontal lines on bottom

Since you at least managed to clear up the picture, it's probably not a fatally wounded panel, which is good.

It could be a backlight issue. Some of the backlight on the right hand side may simply not be illuminated. If it is LED, it could be some LEDs out. If it is CCFL, could be a bad tube or insufficient voltage from the inverter to the tube or leakage (arcing) of the wiring leading to that end of the tube. I've seen all of those or combinations.

[Zudo00]

Re: Sanyo DP46840 - Right side of screen darker than left, horizontal lines on bottom

I saw on the sticker of the back of screen itself that its a CCFL, were it a bulb, would it be easy to replace/cost effective? I got the tv free so i don't mind spending some to fix it up if I can.

[freakaftr8]

Re: Sanyo DP46840 - Right side of screen darker than left, horizontal lines on bottom

Press on the tab bonds on the top of the panel. It honestly looks like a panel issue to me. Turn brightness all the way up and look at red on the picture are they bleeding or faintly smearing if so it's definitely tab bonds but just looking at the picture I can tell you It's tab bonds already

[Zudo00]

Re: Sanyo DP46840 - Right side of screen darker than left, horizontal lines on bottom

I turned the brightness all the way up and now, the dark spot looks normal. I've got company over now, I'll take the panel off later and try the tabs, but hopefully its not that.

[Zudo00]

Re: Sanyo DP46840 - Right side of screen darker than left, horizontal lines on bottom

And now weirdly enough after letting it stay on for abit, the screen flickered and the darkness swapped to the left side instead of the right, so i guess that rules out a bulb.

[drussell]

Re: Sanyo DP46840 - Right side of screen darker than left, horizontal lines on bottom

And now weirdly enough after letting it stay on for abit, the screen flickered and the darkness swapped to the left side instead of the right, so i guess that rules out a bulb.

Actually, I would say that sounds more like a bulb, it's just now brighter at the other end. Less likely to be arcing in the wiring at one end but possibly still be a faulty tube or low voltage from the inverter not fully lighting the tube.

I would think it is much less likely to be a tab bond issue since that's not going to magically change sides whereas a partially lit tube could flicker and blink the bright end from one end to the other, especially as the temperature changes.

You'd really have to be able to observe the tube to be sure.

Just my thoughts....

[nomoresonys]

Re: Sanyo DP46840 - Right side of screen darker than left, horizontal lines on bottom

shimmed a single tab bond on a jvc, is ok now, the symptom was like a dark blob moving from one side to the other, then just went dark after a while.

[Zudo00]

Re: Sanyo DP46840 - Right side of screen darker than left, horizontal lines on bottom

Well what'dya know..It was a tab, pressed it and it fixes itself. Already fixed it up, taped a piece of old intertube on both sides and shut it and voila, tv works. Tab was the first one on the right.

[Zudo00]

Re: Sanyo DP46840 - Right side of screen darker than left, horizontal lines on bottom

Press on the tab bonds on the top of the panel. It honestly looks like a panel issue to me. Turn brightness all the way up and look at red on the picture are they bleeding or faintly smearing if so it's definitely tab bonds but just looking at the picture I can tell you It's tab bonds already

IS there a way to fix this myself, or is it lost?