Proscan 40' LD45Q shadow image

[whatusername]

Hi all I picked up this TV last night it appears the picture is a bit fuzzy and has ghosting or convergence issues what do you think it could be? i have not opened the TV yet

[tom66]

Re: Proscan 40' LD45Q shadow image

I don't see anything particularly wrong with that image.

[whatusername]

Re: Proscan 40' LD45Q shadow image

if u look at the bar hat says no signal u can see instead of it being a full blue bar it has white outline on top and black outline on bottom like its misaligned

[Davi.p]

Re: Proscan 40' LD45Q shadow image

This is a joke? Is a normal shadow graphic effect.

[tom66]

Re: Proscan 40' LD45Q shadow image

That is just a fake 3D effect. Stylistic choice. I don't see any fault there.

[whatusername]

Re: Proscan 40' LD45Q shadow image

This is a joke? Is a normal shadow graphic effect.

no not a joke the guy that sold me the tv told me the image is fuzzy sometimes and sometimes it is normal. I guess i will hook it up to a cable box first and see if i can get a fuzzy pic.. Sorry i did not know that it was a normal image i thought that was what he was talking about.. i will update when i see the fuzzy image

[whatusername]

Re: Proscan 40' LD45Q shadow image

ok so i finally got around to checking the video on the tv and im not liking what i see.. im thinking bad panel but i could be wrong.. pic 1 vertical lines pic 2 colors are all wrong almost like negative effect pic 3 ghosting from menu evident pic 4&5 blacks are blue color are all wrong

so what u guys think?

[whatusername]

Re: Proscan 40' LD45Q shadow image

further research on this tv tells me its actually a bad t-con i will update when i replace it

[whatusername]

Re: Proscan 40' LD45Q shadow image

still working on this tv i finally broke down and bought a board from ebay since my brother procrastinated these past 3 months on it and the new board is worse than the original.. on the above pics it would show solorized imiges hinting on a bad t-con vs lcd panel right? now with the new board i got a white washed screen kinda like that samsung one i posted up a couple months back but if i unplug the tcon i got a normal lit black screen. does that mean the panel is ok? or what is a sure fire easy way to test for a noob with only a dvom as tools?

[tom66]

Re: Proscan 40' LD45Q shadow image

I recommend you post a picture of your T-con, it is possible you have a GAMMA chip fault (AS15 IC failure) it seems about 9/10 T-cons off eBay also have this fault.

[whatusername]

Re: Proscan 40' LD45Q shadow image

Hey tom nice to see u again.. i am familiar with the as15 ic issue which i tried to replace on my original board myself and ruined the board by causing a solder bridge on some legs then trying to remove it ruined the trace on the pcb lol so i bought this one. if it is bad i will have to return it but i dont want to keep getting boards if its a bad panel which i believe its not. i was just looking for re assurance but i will post a pic of the current screen issue

[tom66]

Re: Proscan 40' LD45Q shadow image

You can check the gamma voltages, if they don't fall into a nice gamma curve you know you have got a bad board.

[whatusername]

Re: Proscan 40' LD45Q shadow image

here are the pics

[tom66]

Re: Proscan 40' LD45Q shadow image

Fairly sure that's a gamma fault. To confirm there are some test points to measure.

But we need a clear, focused photo of the far right of the board. We need to be able to see the small text around components.

[whatusername]

Re: Proscan 40' LD45Q shadow image

here you go

[tom66]

Re: Proscan 40' LD45Q shadow image

OK, you need to test on volts DC, the points marked VGAMA1 thru VGAMA22. The TV should be switched on, and the board should be installed,and red probe on the VGAMA point, black on the chassis.

[whatusername]

Re: Proscan 40' LD45Q shadow image

oh how much am i looking for?

[whatusername]

Re: Proscan 40' LD45Q shadow image

the ranges were all over the places ranging from right to left they went from 15v all the was down to 0.2 volts on the left side

[tom66]

Re: Proscan 40' LD45Q shadow image

We need the exact voltages, a range of 15V to 0V is not unexpected but it is more important that they are in order and follow a curve.

[whatusername]

Re: Proscan 40' LD45Q shadow image

ohhh dam thats gonna b hard cuz they r tiny but i will try my best to keep them in order