Re: LG 50PV400 Have Sound but No Picture

Ok,bringing this post back from the dead,lol,haven't had much time lately,but am ready to do some more testing.

I've checked the y-buffers for shorts and don't appear to have any,I also ordered a tested set from ebay,with no change when installed,still no picture at all.

VSC on the Y-sus board is supposed to read 150v as per sticker,but with either set of y-buffers I have,hooked up,the VSC jumps from 150v to 190v and is not adjustable with them hooked up.If I unhook the buffers,the VSC drops to the right 150V,and...

Re: LG 50PV400 Have Sound but No Picture

I know nothing about this stuff,i'm learnin.....but the training manual says to never run set with just P121 disconnected,which is the ribbon cable connecting the 2 upper\lower buffers,and also never run the set with P213 disconnected which is the ribbon cable going from y-sus board to lower buffer,and P221 which again is the ribbon cable going from the bottom buffer to the top buffer...says damage will occur.Here's a paste from the manual.Its stated in a couple other spots through the manual NOT to run the set with those just disconnected,to...

Re: LG 50PV400 Have Sound but No Picture

Ok......now I think we're getting somewere..!!..

With both side Y-buffers totally removed,I got a reading of VSC-155V(remember I was playing with adj),and I was also able to adj the voltage this time,so put it to 150V where tag said it was supposed to be.

-Vy stayed the same at 190.2V tag says 190V

So do you think its safe to say I need to order up a set of Y-Buffers..??

This site rocks..!!!..

Re: LG 50PV400 Have Sound but No Picture

Ok,i'll get at that soon and report back....glad I found the training manual on this site......as with this set I cant just unhook them,it says in manual they have to be completely removed or damage will result.

Re: LG 50PV400 Have Sound but No Picture

Wow...Thanks for the quick reply.......Ya,I always like to try and fix whats broke,kind of a dying art these days.

Ok,have done some readings and this is what I have found.

Power supply Vs tag reads 203v,I get 205...Va tag reads 55V,I get 55.2

Y-Sus board VSC tag reads 150V,I get 191.3.....-Vy tag reads 190V,I get 190.2

Z-Sus board Z-Bias tag reads 130V,I get 129.5


So the only reading that appears to be off is the VSC on the Y-Sus board,and while keeping...

Ok,about 2 weeks ago the tv all of a sudden had a dark thin vertical line from top to bottom,almost in the middle,just a little more to the left.It is a bedroom tv so didn't much care,as was still watchable.

Well last night we were watching it and all of a sudden the display went dark,like it was turned off...but the sound was still working...uh oh....turned it off,left it for a minute,tried it again..same thing...sound works but nothing on the screen...all buttons work as usual,can turn vol up\down..tv turns on\off ok...just no picture..tried dif input,same thing.

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Re: New Members - please post your introductions here

From Belleville,Ontario....hoping to get some help testing a tv.