LG 60PV450UA is this a bad Plasma Display

[Lisalisa101]

Hi I just picked this TV up its a LG 60PV450UA plugged it up and had sound but no picture until I looked closer. Please see the attached pic. this at the bottom left hand corner. Is this a bad plasma display? The tv shows no signs of being hit or anything. Is this a common failure mode on Plasmas? Thanks for your help and ROLL TIDE

[Lisalisa101]

Re: LG 60PV450UA is this a bad Plasma Display

No one can help me with this?

[Lisalisa101]

Re: LG 60PV450UA is this a bad Plasma Display

The image is of snow at the bottom left corner and the rest of the screen is black except with some spots of snow all over the screen when it is set to ant input. Anyone please.

[freakaftr8]

Re: LG 60PV450UA is this a bad Plasma Display

It looks like a zsus fault. Can we get clear pictures of the ysus and zsus boards? Mostly on the zsus there are these reddish colored coils. On the bottom of that board the solder is known to fracture and not make connection which can cause this symptom.

[Alastair E]

Re: LG 60PV450UA is this a bad Plasma Display

Aye--Doubt its the panel....

It'll be a Sustain board or voltage way off type of fault. Check those ERC coils as suggested and check the various voltages as per Panel Label....

[Lisalisa101]

Re: LG 60PV450UA is this a bad Plasma Display

Reflowed the Solder on the coils on both boards no change. The picture just looks odd it looks like a mirror that the coating on the back of it has flaked off. With the lights off you can see little spots of snow all over the screen and in and the bottom left Corner see that as shown in the picture you can see snow this about 4" x 3". When a y or z sus board fails can it cause this type of failure?

[PowerAmpFreak]

Re: LG 60PV450UA is this a bad Plasma Display

Let it run for 10 minutes then check the heatsink of Z-SUS for heat.
Probably they are cool and some failure in the Z-SUS makes the powerpart of the Z-SUS non operational.

[freakaftr8]

Re: LG 60PV450UA is this a bad Plasma Display

Hold on a second mirror coating Has flaked off? Are there any cracks in the screen? Better yet post a picture of the screen in its present condition with good lighting

[Alastair E]

Re: LG 60PV450UA is this a bad Plasma Display

Hold on a second mirror coating Has flaked off? Are there any cracks in the screen? Better yet post a picture of the screen in its present condition with good lighting

Haha--No!

He said--It LOOKS like a mirror with peeling coating--Not that it IS a mirror with peeling coating!

Looks like severe mal-discharge to me....

[Lisalisa101]

Re: LG 60PV450UA is this a bad Plasma Display

The screen has no cracks or even scratches on it. Alastair what is mal-discharge?

[Alastair E]

Re: LG 60PV450UA is this a bad Plasma Display

'Mal-Discharge' is any condition that causes the plasma gas to not completely fire properly usually insufficient excitation voltages across the panel or the timings of the square-waves or priming ramp/reset ramp applied from Y-SUS or the square-wave from X-SUS to the panel from each side not in correct sequence and time to each other--Timing and sequence are seldom the issue Loss of part or all the wave is usually the cause...

Mal Discharge really is a very broad description for a variety of cruddy image problems, from hardly noticeable--to no picture at all--with spots like you have...
Look st the bright side--You got Something on the screen, so the near vacuum of the panel is OK!

Causes are usually a failure of part or all of one or both the Sustain Boards, or loss/reduction of the voltages used in the generation of these waves/pulses/ramps....

[Lisalisa101]

Re: LG 60PV450UA is this a bad Plasma Display

ok so if the Vacuum was lost there wouldn't be any picture at all correct

[Alastair E]

Re: LG 60PV450UA is this a bad Plasma Display

Correct.

The panel sandwich is nearly a complete vacuum. There is a small amount of gas, Xenon and Argon plus others mixed in there--but at very low amounts--meaning the panel is near a vacuum. This is needed because extremely high voltages would be needed if they were at atmospheric pressures.

As the panel is made being a close sandwich with the cells closed off at the top by the screen front, its possible in some cases with certain panels to have a crack/leak of air Into the panel, which will cause a black patch that spreads out and gets worse with time.

This is rare though, When cracked normally the air gets all over pretty quick, leaving no picture, and a buzzing noise when turned on....

Atmospheric Pressure (Std Atmosphere Sea Level), 1013.2mb, Normal Panel Internal Pressure much less than 1mb.....

[Lisalisa101]

Re: LG 60PV450UA is this a bad Plasma Display

So do you think that one of these places that repairs the z sus board can fix this problem?

[Nick's Tvs]

Re: LG 60PV450UA is this a bad Plasma Display

Possibly, and it would at least get your board tested to know for sure if the issue is indeed coming from the Z-sus or somewhere else.

[Lisalisa101]

Re: LG 60PV450UA is this a bad Plasma Display

Just wanted to update everyone it was the Zsus board. Thanks for everyone's help.

[ljintexas]

Re: LG 60PV450UA is this a bad Plasma Display

There are many other components that the coils can take out when over heated..Nick replaced a ton of things on my board.

[ReeceyBurger123]

Re: LG 60PV450UA is this a bad Plasma Display

Them Coils are a nightmare, they can kill the fets on the Ysus board (had it on a 42pj350) and on these it seems they can kill the fets on the Zsus. Crappy Lg engineering here though they should have added rivets to them Coils but no they chose not to

[ljintexas]

Re: LG 60PV450UA is this a bad Plasma Display

LG...Lifes Good!! For the TV Repair Techs! LOL!!

[Alastair E]

Re: LG 60PV450UA is this a bad Plasma Display

Life's good....

Hmm LG.

Originally it was Lucky-Goldstar. Then this crappy life's good bull!