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Plasma Repair Answers | | | The basic idea of plasma display is to illuminate a colored gas substance to form an image. What you see on the screen is burning gas between two pieces of glass. The gas substance is called neon or xeon. Average estimates for the screen to last is 40,000 to 60,000 hours. The plasma screen (PDP) contains a complex structure which has millions and millions of colored pixels. Each pixel is powered by tiny electrodes and has its own gas and color .
Plasma TV problems
| | |  Usually plasma TV problems start with the screen. If the plasma screen is broken or crashed, it's not repairable any more . It needs a new plasma screen replacement, which may cost you more then the plasma TV itself. ( new screen run ..2 -3k in real life .) Budget management !!! Protection front screen (glass on front) can be easily replaced and not so expensive as PDP panel behind it. If you have just protection screen damage your screen(PDP panel) will work without any problem . Plasma screen contains - aluminum base and two pieces of glass with gas between them ( gas inside not rechargeable ). Pixels with gas , controlled by small electrodes . Each pixel contains 3 colored sub pixels : they are green, blue and red. Plasma screen works in 2 steps:
--- gas ignition
--- picture development
IGNITION - power supply >logic control > Z or X sustain,> screen
PICTURE DEVELOPMENT - power supply>,video control board or scaler > ,logic control board>y sustain > x sustain > buffer boards >screen
Common problems with plasma panels - electrodes damage inside, change gas parameters, drivers on ribbon connectors damage.
90% SCREEN PROBLEMS NOT REPAIRABLE
10% ON PANELS 42V6 AND 42V5 (YOU HAVE CHANCE)
Burn-in image:
| | |  This is an Image you can see on top of the normal picture. It's usually displayed as dark lines or a dark area on the screen. Burn-in image developers: TV in-service in airports, libraries, restaurants, hotels, security networks, bars, all public places. If your plasma TV displays an image that's not moving (static image) for a long time, it will develop burn-in spots. This issue is not repairable and you will need a new screen (PDP panel) . That's why for all those restaurants, bars, and public places, it's better if you use an LCD type TV, not a plasma. For example, a Panasonic plasma TV was in a King County bar for 6 months on a sport channel and it developed a burn-in sport channel image. The estimated cost for this type of problem would be $2,500.00. Be smart and save your money !!!!
Vertical or horizontal lines or bars - 2-3" wide:
| | |  There is 60% of chance you will need a new screen. The problem you may have is dead driver (part of a screen) or poor connection between plasma glass and ribbon wire connector. There is some solution for it but not for long time. PDP panel and address driver on it not separated. If one of 26-40 drivers is going out, you need new screen. It is a real question why manufacturers don't separate expensive PDP panel ($2000 and more) and $40 driver IC on it. It is easier to replace a small $40 part than the entire screen. So far they just ignore this issue. Future plasma panel will be aluminum + glass + gas only.( no more drivers on it ) Other common problem with lines on screen -- buffer boards , high ammount of failure for these boards due to poor electronic design
1-- voltage needed to operate controllers on buffer board just to high for small SMD IC
,2--- they are not strong enough to drive address electrode). In future it will be changed for more reliable parts .
Other problems
| | |  | Other problems: A plasma TV is a very hard working device. It is working harder than any TV that has been built before, and as a result - it produces a lot of heat. 75% of technical problems in our shop on plasma TV's are caused by overheating problems. If there is no active cooling system, most of them die in the first 3-6 years. Always ask at the store before buying if there is a cooling system inside. No cooling fans inside = no long life. That is a major rule about plasma TV. Just some advice from real experience: Company names that ignore cooling system - PHILIPS, DAEWOO, some SONY models. A real test in shop - PHILIPS 42 pf7220a/37. After 10 hours of work without cooling system, some of the components on power supply board were out of temperature balance. Vs voltage changes up to 2 volts plus . This may lead to overheating problem and cause other permanent damages. How long will it last? You know. | | Plasma with Cooling System |  | | Plasma without Cooling System | | | | Power supply: The most hard working board in a plasma TV, it develops voltage to supply all components, high current + high voltage. Input fuse is 10 A. Not so many TV's in TV history use input fuse - 10 A. Very sensitive for input AC voltage and output DC voltage. It is a good idea to check your electric outlet before you hook up YOUR plasma. Perfect electric connections are the second major rule for plasma. A real example – a Sony 42" plasma was in service on sparking electric plug in apartment. The result: dead power supply, wiped EEPROM memory, and a repair cost of $470. Save your money:
---don't use cheap extension cords,
---open wires,
--- 100-year-old electric outlets.
Keep in mind that plasma needs twice as much input current as any TV on market.
Common power supply problems:
- hard to turn on,
- stops working after a while,
- does not turn on at all,
- flashing pixels on screen. | | | Logic control, X, Y sustain, buffer boards: controls picture, fires the gas, and many others functions. Common problems include negative image, no image, vertical or horizontal stripes on picture, turns on and than turns off, and many more. Technically they are complitely new electronic devices, nothing before built to compare with.It is always better to relace both sustain boards on any models (on SONY,TOSHIBA,LG you must - no choice).
| | | Care:
- cooling system (if it's not installed by manufacturer)
- good electric plugs
- don't leave plasma on one channel for a long time (2-6 days)
- magnetic fields does not affect on plasma screen like on older TV's
- don't use plasma TV on the same electric line with other powerful units such as
vacuum,
electric motors,
plasma cutter ,
welding equipment.
- NO ELECTRIC GENERATORS - ANY TYPE ANY BRAND (PLASMA IS TO SENSITIVE TO INPUT AC VOLTAGE) !!!!
| | | Major brand or "exotic" brand name?
Major companies build their own product, their own components, and have their own electronic design. They have experienced customer support.
They drive electronic industry forward.
They spend money on a research.
They know what they doing. "Exotic" companies - don't (they do copy and paste!!!!!!) | | | LCD or PLASMA?
Technically LCD.
- no overheating problem
- no burn in image problem
- low electric bill
- not too many hard working parts
- proven technology
- twice as light
no power POWER SUPPLY
hard to turn on BOARD
no power light on front panel STAND BY POWER
turn on after 20 min BOARD
turn on and immediatly shots down
flashing pixels on screen
turn on but no video and sound
negative image
tv turns on and shots down in 2sec X or Y or Z
flashing pixels on screen
dark image SUSTAIN BOARDS
has sound but no video
screen goes black and then return to normal picture
vertical color lines on screen no video
vertical color lines with video
vertical bars on screen
horizontal lines on the image
picture goes red after while
just left part of screen working
just right part of the screen is working LOGIC CONTROL
vertical and horizontal lines on screen
part of screen not working
some functions not working BOARD
no video but has sound
functions not working at all
turns on and shots down no video ,no sound BUFFER BOARDS
part of screen not working
black vertical bars on screen
smell burn
no video from one of the inputs
no sound
no video but has menu lettering on screen AUDIO / VIDEO MAIN
some chanels not working properly
just '' snow '' on screen BOARD
no video but has a grey screen
dark image on part of the screen
burn in image
static image from previous seen channel or show PLASMAPANEL
clears in few minutes
turn on and shots down (PDP)
intermittent change of colors or brightness
Plasma TV contains a few dangerous voltages that can electricute you in seconds . v s = 203 volts,v a =173 volts, Don't feel like you can walk on the water , better pass it to experience technicians, there is no parts inside need your attention and no parts easy to replace.
new!!!
real repair cases in real life in our shop
panasonic 42" plasma
tv turn on , got picture and turn off in 5 seconds
was found - line +15 volt from power supply to main video board after 5 sec overloading and send power supply to protection mode.
bad left speaker (unusual case, one in 6 years).
panasonic plasma 50"
tv works on HDMI input only ,no others input ,front panel buttons not working at all, on remote control on/off only
was found - missing software on internal flash memory
bad tuner board
maxent lcd tv 26"
tv turns on and got crazy vertical lines on the screen
was found - microprocessor on main board loose connections on bottom row
solution - hot air soldering station ( reballing)
pioneer 50" plasma older model with separate receiver box
tv turns on and got bright green flashing screen
was found - Y sustain board working out of control
bad SMD MOSFET 30n60
philips 42pf7220a/37
tv turns on and off in 2 seconds , no picture ,no sound
was found - missing Vs voltage from power supply
bad connection under plastic connector c221
element 32" LCD TV
TV TURNS ON ,no video , no sound
was found - +12 v in real life just +8.5v , +24v just 15volt
bad optocouple in power supply .
PHILIPS PFL37XXXXXXX LCD TV
tv turns on ,got picture ,bt shots down for no reason in 20-40 min
found - signal "on /off "develops on microprocessor for no reason
bad front panel infrared sensor board (SMD capacitors are leaking)
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VIZIO 42" LCD
MASTER AND SLAVE INVERTOR BLOWED UP AFTER FEW DAYS(2-10) BD9897 BLOWED UP 4 TIMES ON SAME TV IN 7 DAYS
FOUND start voltages and current to high for this schematic (poor design) ,CCFL lamps change parameters after 2 years of work.
installation 2 resistors,1 capacitor and 1 zener diode to lower start current
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SONY KDL-40V2500 lcd tv
Turns on for few second ,screen lights up ,and shots down
Found bad transformer on invertor board (upper board)
new transformer solved the case.
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VIZIO P42HDTV10A plasma tv
No picture ,no sound ,screen does not lights up
Found burned yppd-j018c on y sustain board
new IC solved the case
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