REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Wednesday, 20 March 2019

PLASMA TV SCREEN DISPLAY FAULTS & POSSIBLE REASONS - HOW TO EXAMINE DATA-COF IC

PLASMA TV SCREEN DISPLAY FAULTS & POSSIBLE REASONS - HOW TO EXAMINE DATA-COF IC



CHECK METHOD OF SCAN IC
  • Change the Vpp Pin into ANODE and GND Pin into CATHODE and then test the Diode with forward or reverse direction.
SCREEN DISPLAY PROBLEM FOR SCAN FFC
  • It’s may be a problem between Scan FFC and Y B/D.
  • Check the connection of Y B/D and Scan COF.
  • If the Scan IC is failed, replace the Y DRV B/D.
SCREEN DISPLAY FORM
THE SCREEN HAS A VERTICAL LINE WITH REGULAR GAP [A vertical stripe flash at especial color]
  • This is a problem about control B/D.
  • Replace Control B/D.
SCREEN DISPLAY FORM
A DATA COPY IS HAPPENED INTO VERTICAL DIRECTION
  • In this case, it’s due to incorrect marking of scan wave.
  • Replace a Y DRV B/D or Y SUS B/D.
Screen Display Form.
THE SCREEN HAS ONE OR SEVERAL VERTICAL LINES
In this case, It isn’t a problem about controller B/D or XB/D.
It may cause followings.
  • It’s out of order a panel
  • Open or short of DATA COF FPC attached panel
  • It’s out of order a DATA COF attached panel
  • Replace Module.
Screen display form
SCREEN HAS ONE OR SEVERAL HORIZONTAL LINES
In this case, it isn’t a problem about controller B/D or XB/D.
It may cause followings.
  • It’s out of order a panel
  • Open or short of SCAN FPC attached panel
  • It’s out of order a SCAN IC attached panel
  • Replace Y DRV B/D
 Screen Display Form

THE SCREEN DISPLAYS INPUT SIGNAL PATTERN, BUT THE BRIGHTNESS IS DARK.
  • In this case, Z B/D operation isn't complete.
  • Check the power cord of Z B/D.
  • Check the connector of Z B/D and Controller B/D.
  • Replace the Controller B/D or Z B/D.
DISPLAYS OTHER COLORS PARTIALLY ON FULL WHITE SCREEN OR HAPPENS DISCHARGE PARTIALLY ON FULL BLACK SCREEN
  • Check the declination of Y B/D set up, set down wave.
  • Check the declination of Z B/D ramp wave.
  • Measure each output wave with oscilloscope (more than 200MHz) and compare the data with below figure data.
  • Adjust the Y B/D set up(Test-up:B/C - VR1)/setdown(Test-down:D uSEC - VR2) and Z B/D ramp(Tramp:F/G - VR3) declination by changing VR1/VR2/VR3.
  • Measuring Point of Y B/D : P4 (Connector P4 36 pin)
  • Measuring Point of Z B/D : B37 (SUS_OUT).
CENTER OF THE SCREEN IS DARKER THAN A EDGE OF THE SCREEN AT FULL WHITE PATTERN
  • In this case, it’s a problem about Z B/D ramp wave.
  • Check the connection cable of Z B/D and CTRL B/D.
  • Replace the Z B/D.
 Screen Display Form
DOESN'T DISPLAY A SPECIFIED BRIGHTNESS AT SPECIFIED COLOR
  • Check the connector of CTRL B/D input signal.
  • Replace the CTRL B/D.
DATA-COF IC CHECK
It Generates Unusual Pattern of Data COF IC unit
  • In case of generating unusual pattern of Data COF IC unit as below picture, there is problem in the check that is input into Data COF IC
  • In case of <case 1, 2, 3>  - confirm the connection of Data COF connector  - replace the relevant X B/D
  • In case of <case 4, 5>  - confirm the connector that is connected from CTRL to X B/D  - Replace relevant XB/D or CTRL B/D
REGULAR STRIPE GENERATED ABOUT QUANTITY OF ONE DATA-COF IC OR MORE
  • In case of generating regular stripe about the quantity of one Data COF IC, there is problem at the output of output flatworm of X B/D. In case of generating regular stripe about the quantity of two Data COF ICs, that means the data which is conveyed from CTRL B/D is not conveyed well.
  • Confirm the XB/D connection connector plugged in well. Correspond to unusual screen.
  • Replace relevant XB/D or CTRL B/D.
Relationship between screen and X B/D
Screen X B/D
Left Bottom of the Screen 4/7 ó Right X B/D
Right Bottom of the Screen 3/7 ó Left X B/D
Screen Display Form.
Posted By: FRANK at 06:51
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