LG Plasma bottom half screen black

[Catfish]

Hi, I have spent a few days sorting through threads before asking for help so hopefully I won't ask too many stupid questions. Please accept my apologies in advance as I am not a Tech.

I have an LG 1080P 60 inch Plasma TV and the bottom half of the screen is black. It has been playing up on and off like this for twelve months. It seems to be play up more frequently in summer. I live in Australia (no I don't know how to wrestle crocodiles, I don't ride a kangaroo, but I can handle a bloody big snake), and have contacted a tech who is going to charge $150au just to pick the set up before even looking at it.

After reading a few threads, pics and videos on the web and then looking at some of Tom's service manuals(thanks Tom) it seems the problem may be with the Y sustain and or buffers. As I an typing this the set is working perfectly again, but it won't be long before it starts playing up. I haven't attempted to take the back off yet, but that will be the next step. I very good with my hands and I am tech minded, but this is not my area. I know nothing about TVs. I am hoping for some advice first. Firstly am I possibly on the right track and where should I go next. Is it also possible that the ribbon cables are the problem and what should I look for when I take the back off given I only have very basic knowledge. If I can do the work myself I will. And I guess my next question will be, where should I go looking for parts. Thanks in advance for any help and advice. Please see pics below. Oh and this web forum rocks

[Catfish]

Re: LG Plasma bottom half screen black

It looks as though only one of my pics uploaded. Please see the others

[tw2005]

Re: LG Plasma bottom half screen black

Ysus and lower buffer is probably the place to start, reseating connections, checking for cracked solders. Could be failing components which in an intermittent situation can be hard to find.

Is that a 60PS70

[freakaftr8]

Re: LG Plasma bottom half screen black

Ran into this before. Some jackass that replaced the lower buffer board on an LG never clasped the cable locks. The picture was hit-and-miss where you a tap on the back and see the picture come back and then disappeared in areas. Needless to say all the arcing that was going on over the long period of time almost destroyed the Y ribbons. Luckfully with the concoction of a pencil eraser, MR. Cleans magic eraser and some rubbing alcohol and I was able to clean them up to the point where I managed to get the screen to work again.. Hopefully this isn't your problem. That was a bloody nightmare to repair.

[Catfish]

Re: LG Plasma bottom half screen black

Thank you both for your replies.

Is that a 60PS70

In answer to your question, It is a 60PS40FD Manufactured in April2009. It an old set by today's standards I know, but I want to get as many hours out of it as I can. It takes two people to lift, so getting around the back is going to be interesting as there's not a lot of space to move behind.

Tw2005 as you also live in QLD can you please advise the best place to go looking for parts if need be?

I will keep updating as I progress. I should have the back off before the end of the week when I get time.

Oh btw, I purchased the set brand new, so the back has never been taken off since I purchased it in 2009. At least we can rule out some jackass tinkering with it.

[tw2005]

Re: LG Plasma bottom half screen black

Thank you both for your replies.


In answer to your question, It is a 60PS40FD Manufactured in April2009. It an old set by today's standards I know, but I want to get as many hours out of it as I can. It takes two people to lift, so getting around the back is going to be interesting as there's not a lot of space to move behind.

Tw2005 as you also live in QLD can you please advise the best place to go looking for parts if need be?

I will keep updating as I progress. I should have the back off before the end of the week when I get time.

Oh btw, I purchased the set brand new, so the back has never been taken off since I purchased it in 2009. At least we can rule out some jackass tinkering with it.

I suspect these models share the same driver boards. 60PS40FD(Version 60PS40FD-AA-AAULLH) 60PS60FD(Version 60PS60FD-AA-AAULLH)
60PS70FD(Version 60PS70FD-AA-AAULLH) 60PS80FD(Version 60PS80FD-GA-ANRLLH)

I'm going to assume they all use the same main IC on the mainboard. If so that's generally how these die I believe so if you are patient you may snap up one that's dead on Gumtree, otherwise It'd be a matter of fault finding, get the board number and start looking , ebay etc. There's a couple of recyclers in Australia now but they charge like wounded bulls in my opinion.

You could probably get something working for a $300-$400

I'm seeing $50 / buffer and $150 for the ysus and $90 for the zsus

[Catfish]

Re: LG Plasma bottom half screen black

Thank you.

Will the Zsus need to be replaced as well?

I'll get back here with an update once I've got the back off and go from there. The fact that it seems to play up more frequently in the heat is interesting and it may be a connection that is the problem.

[tw2005]

Re: LG Plasma bottom half screen black

Thank you.

Will the Zsus need to be replaced as well?

I'll get back here with an update once I've got the back off and go from there. The fact that it seems to play up more frequently in the heat is interesting and it may be a connection that is the problem.

DOubt zsus will be needed just a bit of extra info.