Vizio P42HD BAD PANEL?????

[jgrice53]

hi all, my first time here. i really want to thank anyone that can give me some insight on this plasma. I have a vizio plasma p42hd from a local university with no picture, and no o.s.d. panel does light when turned on for a few seconds and then it stays lit but very dim. front panel l.e.d. lights amber then green and stays on, the z-sus heat sink would get warm but the y-sus would stay cold. the fs152 on the y-sus was open but all other fuses were good, replaced fs152 and now all the voltages are spot on 5v, 16v, 60va, except the 185vs is at 200v. all P.S. voltages were spot on so I replaced the y-sus. after replacing the y-sus, the tv will power on, with led going from amber to green, screen lights up for a few seconds then goes faint with no video, no graphics. now the z-sus and the y-sus heat sinks stay cold. all the voltages are still spot on. the service manual says to replace the graphics board, (which i have done 2 times), and if that doesn't correct the problem it is a bad panel. is the service manual right, even with a panel that lights up? I have checked the voltages on the power supply over and over, i have replaced the graphics board, the z-sus and y-sus and the left and right buffers. of course all the replacements were supposed to be from working tv's with damaged panels. I do not have a lot of experience with plasmas and i would like to know if a panel can light up with the z-sus and y-sus heat sinks remain cold and have a defective panel? i really could use any help anyone can offer. thank you in advance

[tom66]

Re: Vizio P42HD BAD PANEL?????

PLEASE! Paragraphs!
What happens if you put all of your old boards back in?
I have never seen bad panel w/ no picture on these LG plasmas, except when they are cracked. Usually in such a case though they buzz loudly.

[jgrice53]

Re: Vizio P42HD BAD PANEL?????

i have not tried putting the original boards back in. If you get close to the y-sus you can hear a little buzzing. but theat is with the back cover off.
i can tell neither the z-sus or the y-sus is drawing any current because they both are cold and at V.is at 200v instead of the 185v that they should be.
the boards that have not been replaced are the P.S. the bottom buffer and the input control.

[jgrice53]

Re: Vizio P42HD BAD PANEL?????

in a dark room you can see the screen is dimly lit with what looks like the 4:3 mode instead of 16:9, a few inches on the left and right side of the screen that remain black

[jgrice53]

Re: Vizio P42HD BAD PANEL?????

Hi tom66, I followed your troubleshooting suggestion and unplugged the TV and then disconnected the z-sus and plugged the TV in and when I turn it on all I get is a quick flash of light on the screen and then it goes black. I get the same thing when I do the same thing with the y-sus and either of the buffers. I also re-installed the orignial z-sus and y-sus with no change. i sure am hoping you have other ideas that i could check. thanks