Sunday, May 8, 2011

Should I replace / repair one or both sustain boards in my plasma TV?

 Dear Coppelltvrepair,
I have a blown fuse on my YSUS board, but not on the ZSUS. Do they need to be replaced in pairs, or can we just fix the YSUS? Thanks!!

- tightwadcowboy1954

We get this question all the time and we give the answers all the time, so once and for all we'll post the answer here and just point people to it.

Right answer: It depends.


Short answer: Yes - service both.

Long answer: Read below.



What are sustain boards and what do they do?
 
Every plasma TV that we know has two sustain boards - Y-SUS and Z-SUS (also sometimes called X-SUS).
Below is a picture of a randomly picked plasma which shows their location, which is again the same in all plasma TVs that we have seen this far. You can click on the image to see it in full size.

Y-Sustain and Z-Sustain have very similar functions, but, as can be seen, the YSUS is a bit larger than the ZSUS. It also produces output that goes into what's called YSUS BUFFER board(s) which in turn output to the plasma display whereas the ZSUS outputs directly to the plasma display.

It is because the YSUS does a little more work than the ZSUS. Roughly said, while the ZSUS activates all display lines at once (thus affecting the whole display at the same time) the YSUS, with the help of the buffers, is able to activate (technically address) the individual lines on the display.

Other than that, though, they do pretty much the same thing.

The two boards work together on the display in order to produce proper images, however they do not need each other in order to function. In other words the function of one does not affect the function of the other.
They work on the display practically independently from one another, only in a fashion synchronized by another board, so that you get to see what you want to see.

Direct conclusion from the above is that with some exceptions

When one sustain board fails it does not affect functionality of the other.
In other words if your YSUS failed that should not and usually do not affect your ZSUS and the other way around.

The most notable exception that I can think of is when one of the boards takes power from the other and not directly from the power board. This is the case in some LG 50'' models where the ZSUS 6871QYH044 takes power through the YSUS 6871QYH039; when YSUS fails it may burn the fuse and thus cut ZSUS from power.

Technically, however, ZSUS' functionality is still not affected in this case - the board is functional, only the power to it is cut.

Which is to explain and underscore that functionality of one sustain is not affected by the other.
Still, it is affected by something completely different, which suggests
It may still be better to service or replace both sustain boards at the same time.
Here is what it is:

Sustain boards are the hardest working boards in plasma TVs. Many of them, especially those designed in the early plasma technology years - 2001 to 2005 - are improperly designed and/or improperly built so that they work at too high temperatures.

As you should know from your basic physics course matter expands when its temperature raises and shrinks when temperature lowers. 
The higher the temperature differences, the bigger the physical difference.

This cycle of expansion and shrinking , let's call it thermo-cycle, is also affecting other properties of the matter than its size. It also changes its electrical and mechanical properties.

Those changes are practically aging of the matter and, most simply put

Most plasma sustain boards have practically limited life
To summarize: because they work on too high temperatures, their expansion/shrinking is too drastic and that leads out to too limited life expressed in failures every several years.

Is it a design failure? Or is it simply badly built semiconductors?

Was it done on purpose? Or was it just another side of the wild competition leading to lower quality?

I won't discuss those here. But I'll return to the question at hand: 
What happens with your sustain boards during their life time?

Well, they wear out, that's what happens.

The example I like to give is two car tires on the road.

Road and friction do to car tires what marginal thermo-cycles do to semiconductors (and everything else actually).

So you've had two tires that have been working side by side for so long that they both got very worn out. You didn't see the treads, but if you were to look maybe you would have seen them.

And one sweet day one of your tires just couldn't take it anymore and blew. Just from wearing out.

Car tires - and semiconductors - are never really exactly the same, so they'd rarely wear out in the exact same way and burst out at the exact same time.

But you can make a very good guess as to the condition of your other tire or sustain when one of them bursts.

Granted,
sustain boards are NOT car tires after all
You don't risk your life or someone else's life  when you watch TV.

Often the second sustain board would fail fairly soon after the first - hours to days.

About equally often it may take weeks.

It would be unusual to take months, but it is not unheard of.

Hopefully you get the point.

This is also why it is better to have a board serviced than replaced with a used working board
Of course it is best to replace it with brand new one, but this is often prohibitively expensive or even impossible. I personally wouldn't advise anyone to spend $250 for a brand new sustain board on a 42'' or even 50'' plasma TV made in 2005 or so. It's flat out insane, first because TV prices dropped a lot since then and second because we know now that soon that TV is likely to need at least another board replaced. $500 for service of a TV that can be replaced for $600? Thanks, but no thanks!

Service, on the other hand, ensures (when properly done) that the power components will be replaced with new ones.

Replacement with a used board obtained from a chop-shop like Discount-Merchant, ShopJimmy or eBay is going to replace one used board with another used board...with very short life expectancy.

You do the math.

21 comments:

Tracy said...

Dear Coppelltvrepair, I have a Sanyo Plasma tv DP42746 and it was working great, then one day the tv would not display any sound or picture. The tv does power up and the green light in the right lower corner lights up, but no sound or picture. I took of the back panel and noticed the error code light was green also, not blinking, the fuses showed continuity, and no capacitors appeared to be dome shaped. I did notice a white paste had melted out from under the biggest heat sink on the y-sustain board. It leaked onto the fuse ,below the heat sink and IC, and onto the power connector. I tested the y-buffers as you described and both showed 595Mohms in the reverse direction, and infinity in the right direction. There is also a buzzing sound coming from the heat sink that leaked the white paste. Should I just get the y-sustain board repaired?

Unknown said...

I have an LG 60pz550 I was watching a movie, took 10 seconds to get a glass of water when I came back the sound was still normal but the screen was black. I was told to replace the Zsus EBR73561701 should I also replace Ysus EBR73561201and the bufferboards EBR7356100 and EBR73560801 looks like this model has two buffer boards under the other Also would you have the parts or know where to purchase I have looked every where online all are out of stock

Unknown said...

Unkown don't know what outcome you had. I have the same 60PZ550. Researched much like you after having the same issue but what is driving me to change the Y SUS is after many searches a symptom of the Y SUS failure is the TV will occasionally power it self off and right back on. This starting happening shortly before we starting losing the picture. Post said that this symptom would be result of Y SUS failure. $150 new and I found it at the LG certified part distributor for the Mid West out of Ohio. Wish me luck

charlie puth said...

thanks for post

kutta song said...

Super Bowl LI will be the 51st Super Bowl and the 47th modern-era National Football League. The Touchdown Tour is a way to excite the Houston community about the 2016-2017 football season culminating in Super Bowl LI.
Super Bowl 51
Super Bowl 51 Live
Super Bowl 51 Live Stream
Watch Super Bowl 51
Watch Super Bowl 51 Live
Super Bowl 51 Live Online

Jhon Gabigel said...

Super Bowl 2017
NFL Super Bowl 2017
2017 Super Bowl
2017 NFL Super Bowl
Super Bowl 2017 Game
Super Bowl 51
Super Bowl 51 Live

xyxy said...

Super Bowl 2017 Live


NFL Super Bowl 2017 Live


Super Bowl 2017 Live Stream


Super Bowl 2017 Live Streaming


Super Bowl 2017 Live Free


Super Bowl Halftime Show


Watch Super Bowl 2017

zzzzzzz said...

Grammys
Grammy
Grammy 2017
2017 Grammy
Grammys 2017
2017 Grammys
Grammys live
Grammys live Stream
Watch Grammys
Grammys Awards
Grammy Awards
Grammy Awards
Grammy Awards 2017
59th Grammy Awards
59th Annual Grammy Awards
Grammys Awards 2017

Atikur Rahman said...

Biggest Awards Oscars 2017 Live Stream Online Watch Full Show Coverage ,Time, Date, Red Carpet HD Video In Any Device.Get the latest news about the 2017 Oscars, including nominations, winners, predictions and red carpet fashion at 89th Academy Awards Oscar.com.

Oscar 2017
Oscars 2017
Oscars 2017 Live
Oscars 2017 Live Stream
Watch Oscars 2017

xyxy said...

UFC 209: Woodley vs. Thompson 2 is an upcoming mixed martial arts event produced by the Ultimate Fighting Championship that will be held on March 4, 2017. Event information, results, video, and fighter information for UFC 209

UFC 209


UFC 209 Fight Card


UFC 209 Live


UFC 209 Live Stream


UFC 209 Start Time


UFC 209


UFC 209 Live

Brian Hockly said...

UFC lightweight Marc Diakiese is putting out a strong message of tolerance and acceptance, become the first fighter for the world's largest MMA. CONOR McGREGOR has been pictured with Manchester United star Wayne Rooney as talks of a superfight with Floyd Mayweather rumble on.
UFC 209
UFC 209 Live , UFC 209 Fight Card
UFC 209 Live Stream , UFC 209 Fight

RONDA ROUSEY was battered by Amanda Nunes in her long-awaited UFC comeback bout - here are some of the best pictures from the fight. Born in Sweden, Hermansson (14-3) looks to bounce back from his first UFC loss, a submission defeat to Cezar Ferreira that snapped .
UFC 209
UFC 209 Live Stream , UFC 209 Live
UFC 209 Fight , UFC 209 Fight Card

RUna SP said...

Following having a few days and nights with mid-major March Madness championship game titles claiming the college or universityMarch Madness Live hockey spotlight, the Power 5 March Madness Live Stream conference tournaments learn to take center stage today. These kinds of are the games that will help define how a bubble and the rear end of the NCAA March Madness Bracket Tournament bracket shakes away.
March Madness 2017
On Wednesday, Syracuse, New mexico, March Madness 2017 Live California, TCU, Ohio Express, Wake Forest, 2017 March Madness Virginia Technical, Texas Tech, Xavier and The south all play game titles NCAA March Madness that will either help solidify their at-large berth/seed or make Selection Weekend more of an stressed day. march madness schedule

One other quick note: I moved Gonzaga back up to the top seed line after a third thoroughly impressive win over a very good Saint Mary's team in the WCC name game. That's not overall, though. The Pac-12 competition champion march madness schedule 2017 could easily turn out there by the end of the week, particularly if the winner of the Arizona/UCLA semifinal beats Or in it game.

Staven Jobs said...

As the glimmer of March Madness 2017 (NCAA Tournament) becomes a raving fire, we're sure that you intend to sign up with numerous individuals to see the most exciting college basketball event of the year! Below's how you could see March Madness 2017 HD 1080p 720p on any of your gadgets such as apple iphone, iPad, Android, Mac/PC, Apple TV, etc.
March Madness

March Madness Live

March Madness Live Stream

March Madness 2017

March Madness 2017 Live

ncaa March Madness

ncaa march madness live

ncaa tournament

March Madness Bracket

ncaa final four

Enjoy March Madness 2017 Live on TV with Cable
The simplest way to catch a total amount of 68 teams including to play basketball video games is to watch them on a cable with NCAA Tournament membership. Channels airing March Madness 2017 like ESPN, AMC, TNT, TBS, Food Network, Sling TELEVISION, and also Roku TV will bill $20 monthly with no contract.
March Madness

March Madness Live

March Madness Live Stream

March Madness 2017

March Madness 2017 Live

ncaa March Madness

ncaa march madness live

ncaa tournament

March Madness Bracket

ncaa final four

After paying, all subscribers could enjoy unrestricted real-time streaming protection throughout the whole males's basketball championship 2017 on TV.

Neuro Moon said...

Idaho: Despite the fact a Tar High heel sandals sacrificed inside ACC match semifinals, on the list of Duke on the rules meant for much of the main 50 percent. Justin Fitzgibbons, who's formulated a good experienced outside game, together with a foul-free Joel Berry II are definitely the keys.
March Madness

March Madness Live

March Madness Live Stream

March Madness 2017

Certainly, we understand Indicate Number of has not constructed a final Four. This group, stored using accomplished scorers which might moreover shut all the way down attackers, can be your partner's initial
March Madness 2017 Live

ncaa March Madness

ncaa march madness live

ncaa tournament

March Madness Bracket

ncaa final four

Irrespective of whether you’re still on the wall with that 8-9 online game, or simply would like a total feeling on your Final Four choices, we’ve became everyone protected by having a ranking of all 68 squads inside the contest. Anybody can with certainty help make your choice with all those mid-major darlings you’ve become eyeing with regard to ticked-off probable.
March Madness

March Madness Live

March Madness Live Stream

March Madness 2017

March Madness 2017 Live

ncaa March Madness

ncaa march madness live

ncaa tournament

March Madness Bracket

ncaa final four

Villanova: The top general seed products. Despite the team’s location with the toughest location (the East, with matchups vs Duke together with SMU looming), Villanova’s three-man bothersome center with Jalen Brunson, Josh Hart and Kris Jenkins has the possible to help reiterate for the reason that national champs.

Atikur Rahman said...

We give a moment of silence for these five matches that we anticipated but did not make it to the final WWE WrestleMania 33 lineup. At WWE Wrestlemania 33, Taker will step into the ring with Roman Reigns, who has promised repeatedly that he will retire The Deadman. WWE WrestleMania 33: 10 Returns That Could Happen ... As such, Michaels was given his first Wrestlemania match.

Wrestlemania

WWE Wrestlemania

Wrestlemania 33

WWE Wrestlemania 33

Wrestlemania 33

Wrestlemania 2017

WWE Wrestlemania 2017

Wrestlemania Live

WWE Wrestlemania Live

Wrestlemania Live Stream

WWE Wrestlemania Live Stream

Wrestlemania 33 Live

Wrestlemania 33 Live Stream

WWE Wrestlemania 33 Live

WWE Wrestlemania 33 Live Stream


Get WWE WrestleMania 33 results & updates, including 2017 winners and WWE video highlights of the best matches from WrestleMania 33 this year.

Atikur Rahman said...

The Masters Tournament, also known as The Masters or The US Masters, is one of the four major championships in professional golf. The Masters is scheduled for the first full week of April, and it is the first of the majors to be played each ye

Masters Live

Masters Live Stream

Masters Golf Live

Masters Golf Live Stream

Watch Masters

Watch Masters Golf

Masters Leaderboard

The Masters Leaderboard

Masters Live

Masters Live Stream

Masters Golf Live

Masters Golf Live Stream

Watch Masters

Watch Masters Golf

Masters Leaderboard

The Masters Leaderboard

Masters Tournament 2017 live coverage from Augusta National Golf Club at CBSSports.com. Watch the tournament live, choose cameras and get live stats.

RockBD said...

Thanks To Watch The Masters 2017 Live Stream, one of the most prestigious tournaments in golf, is set to take place this week at Augusta National Golf Club from April 6-9.

Masters 2017

The Masters 2017

Masters 2017

The Masters 2017

Masters Golf

UFC 210

UFC 210

We already know Tiger Woods won’t be Masters 2017 Live participating in the 2017 Masters, but there are still intriguing questions entering this year’s tournament.

Larry D. Sloan said...

A week after Chavez vs Canelo went toe-to-toe in an instant classic, boxing fans get another star-studded fight when Saul “Canelo” Alvarez (48-1-1, 34 KOs) and Julio Cesar Chavez Jr. (50-2-1, 32 KOs) meet at the T-Mobile Arena in Las Vegas.
Canelo vs Chavez Jr Live

Chavez Jr vs Canelo Live

Chavez Jr vs Canelo

Canelo vs Chavez Jr Live

Larry D. Sloan said...

A week after Chavez vs Canelo went toe-to-toe in an instant classic, boxing fans get another star-studded fight when Saul “Canelo” Alvarez (48-1-1, 34 KOs) and Julio Cesar Chavez Jr. (50-2-1, 32 KOs) meet at the T-Mobile Arena in Las Vegas.
Canelo vs Chavez Jr Live

Chavez Jr vs Canelo Live

Chavez Jr vs Canelo

Canelo vs Chavez Jr Live

Yeran mana said...

Are you going to watch the Kentucky Derby 2017 live online via app, on TV or in person? You have the Kentucky Derby games? Do not hesitate to leave your comments, reflections and opinions in the next section.

Kentucky Derby 2017

2017 Kentucky Derby

Kentucky Derby 2017 Live

Ky Derby 2017

Canelo vs Chavez

Chef Bobby Flay will not be the only one who promotes delicious food at the Derby. Tasty BuzzFeed and have partnered with NBC. BuzzFeed publishing live and tasty Derby stories has created a series of videos for those looking for the perfect Derby party dish. Watch the video for the tasty chocolate bourbon balls perfect for any part of the Kentucky Derby.

Mild Pegg said...

bart easy earning system

bart easy earning system

bart easy earning system

Post a Comment