Sanyo DP50749 50inch plasma tv picture issues

[gillisfire]

I have had this tv for about 3 yrs now. The picture started acting up and going dark. I found that if I put a fan (and eventually an a/c duct) blowing up towards the main board, the tv would work with no issues. So because of this I thought the main board was going bad. I eventually got lucky and found the correct board on line and replaced it.

Well it turns out the main board wasn't the problem. The tv still works ok for a little bit, but eventually the picture starts getting dark again. So now I am back to square one. What is the next thing I should look for that may cause the picture to go dark. I am open to any suggestions since I am a newbie at this.

[tw2005]

Re: Sanyo DP50749 50inch plasma tv picture issues

probably need a little more info and a picture of the display when it's normal and one when it dims.

Looks like this model could be panasonic,LG or Samsung based which may also help in working out what's wrong especially if it's a common issue based on the panel it may have.

If I was to have a guess, I'm expecting it won't be a panasonic panel and maybe Samsung?

A bad Xmain if Samsung or Zsus if LG could cause a dim picture. Some voltage checks may give a clue but really need to know what the boards are that in it to maybe find another model's service manual to get some specs.

I know some of the panasonic stuff, not real knowledgable on the LG/Samsung but good chance someone else has experienced a similar issue.

A photo of the layout of the boards may be handy for everyone too.

[tw2005]

Re: Sanyo DP50749 50inch plasma tv picture issues

Is this the same Tv that you first posted back in november with the samsung parts?

https://www.badcaps.net/forum/showth...hlight=dp50749

If so, you'd be better off adding to that post so all the previous history can be read plus there's photos already uploaded for that one.

[tw2005]

Re: Sanyo DP50749 50inch plasma tv picture issues

You could try disconnecting the Vs cable from the Xmain and if the display is the same as when it has these dim issues, that may give a clue it could be Xmain related. I don't know if this will cause a shutdown but might be worth a shot for isolating the cause.

[gillisfire]

Re: Sanyo DP50749 50inch plasma tv picture issues

Tw2005, sorry that was my thread with the Samsung based unit. I thought posting a newer thread would be better but I went ahead and updated the older one. When I get a chance this weekend I will try and disconnect the Xmain and post some updated pictures.