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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 xenon. 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 .You all know the daylight fluorescent bulbs you use in your house .Just imaging millions of them inside in your plasma screen. Each one controlled by brightness and color . That is what your plasma screen is.
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.
TYPICAL bad PLASMA SCREEN symptoms
1 Flashing red dots or pixels on the screen when it is cold (after warm up it goes away ) - bad screen
2 distorted colors on part of the screen - LEFT OR RIGHT CORNER -BAD SCREEN
3 COLORED VERTICAL LINES ON PICTURE
4 flashing red dots on some part of the screen
90% SCREEN PROBLEMS - NOT REPAIRABLE
10% ON PANELS 42V6 AND 42V5 (YOU HAVE a 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 VERY 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 experience 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!!!!!!)
LED TELEVISION REPAIR
THERE IS NO BIG DIFFERENCE BETWEEN LED TV AND LCD TV REPAIR . SAME POWER SUPPLY , MAIN BOARD ,T-CON AND LCD PANEL ON FRONT
THEY DON,T USE INVERTOR BOARD ANY MORE AND CCFL LAMPS INSIDE LIKE IT WAS ON LCD TV .
256 OR MORE LED DIODES LIGHTS UP YOUR LCD SCREEN INSTEAD OF 6-10 CCFL LAMPS. YOU GOT BETTER BALANCE BETWEEN BLACK AND WHITE ON PICTURE AND SMALLER ELECTRIC BILL.
LED TELEVISION IS SIMPLIFIED VERSION OF LCD TELEVISION . DOES NOT REQUIRED ANY SPECIAL KNOWLEDGE ( IF YOU ALREADY KNOW HOW LCD TV WORKS).
USE LESS ENERGY AND HAS A LITTLE FASTER VIDEO PROCESSOR.
| | | LCD or PLASMA?
Technically LCD.
- no overheating problem
- no burn in image problem
- low electric bill
- not so many hard working parts
- proven technology
- twice as light
plasma tv failure symptoms
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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 immediately 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
changing in size vertical colored lines
horizontal lines white or colored
no video from one of the inputs
no sound
no video but has menu lettering on screen AUDIO / VIDEO MAIN
some channels not working properly
just '' snow '' on screen BOARD
no video but has a gray colored screen
wan,t to turn off
picture distorted after while
intermittent sound
wan,t bring the menu on screen
shots down for no reason
dark image on part of the screen
burn in image
static image from previous seen channel or show PLASMA PANEL
clears in few minutes
turn on and shots down
flashing red dots when it is cold (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 !!!!
Some Real Repair Cases in Real Life in our Shop
PLASMA AND LCD TV REPAIR TIPS
panasonic 42" plasma REPAIR
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" REPAIR
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 REPAIR
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 REPAIR
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 REPAIR
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 REPAIR
tv turns on ,got picture ,but shots down for no reason in 20-40 min
found - signal "turn 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 TV REPAIR
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 changed internal parameters after 2 years of work.(need a bit more current to start and run)
CURE ---- installation 2 resistors,1 capacitor and 1 zener diode to lower start current
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SONY KDL-40V2500 lcd tv REPAIR
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 REPAIR
No picture ,no sound ,screen does not lights up
Found burned yppd-j018c on y sustain board and open fuse 4a
new IC solved the case
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VIZIO GV42L HDTV LCD TV REPAIR
no picture ,no sound
bad main board
changing ic u11 solved the problem
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HITACHI 42HDT52A REPAIR
doesn,t turn on
bad ja05958 main board
changing ic i106 solved the problem
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LG 42" LCD TV REPAIR
has video, no sound
not responding to remote control and front panel buttons
responding when you push remote control and front panel button same time
bad infrared sensor (killed by WINDEX using to clean the screen)
changing IR sensor + restart factory sound settings in service menu solved the problem
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POLAROID 46" LCD TV REPAIR
no power
found blown capacitors in power supply + bad 3.3v voltage regulator on main board + 5v switching SMD MOSFET on main board
after change - life is normal again .
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VIZIO P50HDTV10A REPAIR
powers on ,has sound ,no picture
on y sus board found dead yppd-016c integrated ic
all fuses -ok
changing IC solved the case
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SONY 46 " LCD 4100 MODEL REPAIR
POWERS ON, NO SOUND ,NO VIDEO ,BACKLIGHT IS OK
FOUND - WHEN YOU UNPLUG ONE OF RIBBON WIRES GOES TO LCD SCREEN FROM LCD CONTROL BOARD
TV SHOWS THE PICTURE BUT HALF OF SCREEN
WHEN YOU PLUG IT BACK PICTURE SHOTS DOWN COMPLETELY
DEAD SCREEN (NOT WORTH TO FIX IT)
LOW QUALITY SCREEN DESIGN
OFTEN SCREEN PROBLEMS - THAT IS A SONY
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case today 10.24.2010 DELL W4201CHD REPAIR
POWERS ON BUT NO PICTURE
FOUND --- SHORTED TOP BUFFER BOARD, Y SUS BOARD NOT WORKING EITHER
CHANGING TOP BUFFER BOARD + ONE MOSFET ON Y SUS BOARD
SOLVED THE PROBLEM
NO ACTIVE COOLING SYSTEM INSIDE (POOR DESIGN + NO COOLING SYSTEM
THIS MODEL WILL WORK NO MORE THAN 5 YEARS ( Y SUS WILL AUTOMATICALY DIED IF THERE IS ANY PROBLEM WITH ONE OF THE BUFFER BOARDS - MY OWN OPINION )
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VIZIO VP50 HDTV20A REPAIR
TURNS ON, NO PICTURE , SHOTS DOWN IN 25 SEC
FOUND --- 2 BUFFER BOARDS (TOP AND BOTTOM) SHORTED
PAY ATTENTION ON BUFFER BOARDS ON THIS MODEL !!!!!!!!!!!!!!
80% OF PROBLEMS ON THIS MODEL --- BUFFER BOARDS
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POLAROID FLM-3232 REPAIR
TURNS ON, SCREEN BLACK , NO VIDEO
FOUND - ON MAIN BOARD VOLTAGE 1.8 VOLT FOR MICROPROCESSOR
IS 1.25 VOLT ONLY
CHANGING + 1.8 VOLT REGULATOR ON MAIN BOARD (AS117) SOLVED THE PROBLEM
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HITACHI 55HDT52 REPAIR
TURNS ON , NO PICTURE
FOUND - MISSING Vs AND Va from power supply
changing 50n50 mosfet and 2.2 ohm resistor in power supply solved the problem
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SHARP 26" LCD LC-26SB24U REPAIR
SOMETIME WORKS ,SOMETIME NO POWER ,NO VIDEO
FOUND - MISSING ALL VOLTAGES FROM POWER SUPPLY EXEPT STAND BY +5V
BAD RELAY 5V IN POWER SUPPLY
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LG PLASMA 50PC5D REPAIR
TURN ON ,NO VIDEO ,NO SOUND , WILL NOT TURN OFF
FOUND - MAIN BOARD NOT WORKING PROPERLY ( MISSING +3.3V voltage regulator FOR HDMI CONTROLLER)
CHANGING HDMI MICROPROCESSOR / CONTROLLER ON MAIN BOARD SOLVED THE PROBLEM
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HITACHI P50T501 REPAIR
TURN ON AND OFF IN 2 SEC. NO VIDEO /NO SOUND
FOUND - BURN M807(LOCATION) IC ON ND60200-0047
NEW IC 3294F SOLVED THE PROBLEM
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PHILIPS 42PF7220A/37 REPAIR
TURN ON ,AFTER 2 SEC -OFF ,NO VIDEO / NO SOUND
FOUND --- Y SUS SHORTED (POWER SUPPLY GOES TO PROTECTION MODE)
CHANGING C5041 ,D5022 ,Q5010 ON Y SUS + FOUR IC SN755867 ON
LJ41-02760A SOLVED THE PROBLEM
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sanyo
dp26648 26 " lcd tv
no video , has background light
remove all the parts and reattached cable between main board and lcd control board t-con - solved the problem
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Magnavox 32mf231d REPAIR
no video / no sound
after testing -- found power supply not working
transistor 10n80 in power supply shorted
after replaced 10n80 mosfet - normal performance
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Toshiba 42hp66 REPAIR
no video / has sound
after testing - not working z sus board
changing yppd-c018c ic and fuse 4a on it solved the problem
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Vizio vp422 hdtv10a
after 5- 10 min no picture ,has sound,no menu,flashing lines only
after checking - main board not working properly
we install main board from vp423 hdtv10a -works perfect
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Vizio gv47l hdtv 10a REPAIR
intermittent problem - sometime it is working good
sometime- no video, no sound
found - main board , u5 voltage regulator mps 1117 (1.8 volt)
after changing u5 on main board - back to the life
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Vizio lcd tv vx37l hdtv10a REPAIR
turn on , no video ,vertical lines no sound , wan,t to turn off
main board not working
open fuse +12 volt line on main board , fmps1117 regulator on main board drop voltage to 2.1 volt instead 3.3 volt (input 5 volt)
after changing fuse and regulator on main board - works perfect
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Vizio p42 hdtv10a REPAIR
turn on ,has video .flashing dots all over the screen ( milky way)
adjustment VSET on y sus - works but 50 % of dots still there
other adjustments on y sus board -- no help at all.
changed 053b y sus board -- same problem.
changed logic control ----- bingo !!!!!!!!!!!!!!!!!!!!
077b logic control board (all smd capacitors on logic control board - high ESR. )
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TOSHIBA 42HP66 REPAIR
turn on ,no video , some changing in size vertical colored lines ,
one of the driver IC on buffer board 117a extremely hot
dead buffer 117a board
changed 6871xxxx117a buffer board.
tv back to the life
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PANASONIC TH-50PZ85U
turn on , shots down in 3 sec , 10 times light on front panel
bad power supply - FAMOUS ETX2MM704MG
MISSING Vs and other voltages
i am not going to show this time all problems this power supply has ,because there are people making money on fixing it. We respect that .
But this time - we did extreme "facelifting" way , you can,t see it anywhere in internet. That is our way ,and we do not sell that . THIS INFO IS FREE .But you have to be a electronics repair handyman .
We changed ETX2MM704MG on ETX2MM706NG power supply
Yes , it is completely different board , but has exactly same connectors with no change ,and 706 is more powerful board with same output voltages ans sygnals.(no need to adjust ) and cheaper .
ETX2MM704MG main power board and small stand by power supply were removed and 706ng (contains two board on aluminum chassis) installed.
it is a little bigger in size , you have to modify couple holders to tight the board. We install one extra holder to tight power supply to aluminum casing of plasma panel .
In our case it fits perfect. all wiring connectors are the same
Some wires got to short to reach connectors , but we always can just increase them in length . Soldering skills required !!!!!!!!!!!
After change - works perfect . no adjustment .
We hope PANASONIC can and will install 706ng power supply on 50" plasmas instead 704mg .
ready project picture http://i1177.photobucket.com/albums/x359/torba67/IMG_0539.jpg
model th-50pz85u with installed 706ng power supply..
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PANASONIC TH-42PZ77U REPAIR
" face lifting " on famous power supply ETX2MM681MF same story as above but this time we install TNPA3911 POWER SUPPLY instead ETX2MM681MF wires on connector p12 need to be increase in length ,rest of it the same
connector p9 need modification
screws holders need to be modified also
same voltages ,same control signals
if you do not have etx2mm681mf power supply you can do tnpa3911.
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PANASONIC TH-42PZ80U REPAIR
NO POWER 10 BLINKS
DEAD POWER SUPPLY LC0719-4001DC
INSTEAD LC0719-4001DC WE INSTALL ETX2MM747AF POWER SUPPLY
THIS PROJECT FOR EXPIRIENCE REPAIR TECHS ONLY
P12 CONNECTOR COMPLETLY MODIFIED
REST OF CONNECTORS ARE THE SAME
+ 15 V , +60V WE INJECT IN TO P12 CONNECTOR
USING P35 CONNECTOR ON 747 BOARD
NO ADJUSTMENT
SAME VOLTAGE
SAME CURRENT
BOARD HOLDERS HAS BEEN MODIFIED ALSO
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Panasonic TH-50PX600U REPAIR
panasonic power board ETXMM610MEF
no power ,shots down in 2 seconds
found missing Va voltage
instead 610mef power supply we install TNPA3911 (SAME VOLTAGE ,SAME CONTROL SIGNALS, SAME CONNECTORS)
NO ADJUSTMENT NEEDED.
NEW BOARD NEED TO BE UPSIDE DOWN AND P12 CONNECTOR NEED EXTENTION 3-5 " ( TO SHORT)
2 BOARD HOLDERS NEED MODIFICATION.
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VIZIO VX37L HDTV10A REPAIR
TV IS ON - BLUE SCREEN FOR 2 SECONDS AND SHOTS DOWN.
FOUND--- ONE OF THE CCFL LAMPS INSIDE THE SCREEN BURNED.
AFTER LAMP CHANGE - WORKS PERFECT
TO KNOW WICH LAMP IS BAD YOU HAVE TO SHOT DOWN PROTECTION ON INVERTOR BOARD .(PIN 15 ON IC OZ9966SN - 10-20 K RESISTOR TO GROUND)
TURN ON ,AND YOU WILL SEE BURNED OR BAD LAMP .
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vizio VX42LHDTV10A REPAIR
| -------------------------------------------------------------------------------------------------------------------- vizio VX42LHDTV10A no video , no sound
found - missing 24 volt and 12 volt from power supply. original power supply DPS-283AP is dead.
DPS-283AP not available in shop , customer need it extremely fast . problem solved by installing DPS-319AP power supply from other model.
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VIZIO VX32L HDTV10A REPAIR
VIZIO VX32L HDTV10A PICTURE-OK SOUND -OK
REMOTE CONTROL DOESN,T WORK .
FOUND - SHORTED SMD CAPACITOR 1 MKF ON INFRARED SENSOR BOARD. SOLVED BY REMOVING CAPACITOR FROM THE BOARD. --------------------------------------------------------------------------------------------
HITACHI 55HDT52 REPAIR
Turn on and shots down in 5 seconds
found blown IC M801 on buffer board ND60200-0033
SOLVED by changing sn755866 IC on buffer board
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SAMSUNG HP-S4253 REPAIR
HORIZONTAL LINES ON PICTURE ,sometimes picture -ok
sometimes - no video
found blown capacitor c5065 on Y SUS board
changing capacitor solved the problem
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12.12.2011 VIZIO L32 HDTV10A REPAIR
No power
Power supply is dead DPS-199AP
Cristmas time - customer need it fast , no original power supply in shop
install FSP201-3M01 power supply solved the problem.
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SAMSUNG LN-R238WA REPAIR
Redish background light ,shadows on picture ,vertical lines
found oxidation on LVDS cable connectors (main board side)
cleaning connectors on t con and main board and LVDS cable solved the problem
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VIEWSONIC VX2835WM REPAIR
NO POWER, no blue light on front
original PSM217-404-H-R IS DEAD (HARD TO FIND)
Install DPS-210 POWER SUPPLY BRING UNIT BACK TO LIFE
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