Thursday, January 17, 2013

HYUNDAI H-PDP4203 / P42LV6-T1 _ PLASMA _ TROUBLESHOOTING





NO PICTURE

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A screen doesn't display at all and condition of black pattern or power off.
  • Check whether the CTRL B/D LED (D10, D11, D12, D13, D17) is turned on or not.
  • Check the power and signal cable of CTRL B/D.
  • X B/D, Y B/D, Z B/D is well plugged in.
  • Check the connection of X B/D, Y B/D and Z B/D to CTRL B/D.
  • Measure the output wave of X, Y, Z B/D with oscilloscope(more than 200MHz) and find the trouble of B/D by comparing the output wave with below figure.

  1. Measure Point fo Y B/D : TP(Bead B103)
  2. Measure Point fo Z B/D : TP(Bead B37)
  3. Measure Point fo X B/D : COF TP

  • Check the SCAN(Y side) IC
  • Check the DATA(X side) COF IC
  • Replace the CTRL B/D.

HITCH DIAGNOSIS FOLLOWING DISPLAY CONDITION

4/7 or 3/7 of the screen doesn’t be shown
  • Confirm the power connector of X B/D is well plugged in which is correspond to not showing screen.
  • Confirm the connector that is connected between CTRL B/D and X B/D correspond to not showing part.
  • Replace relevant X B/D.

Relationship between screen and X B/D
Screen X B/D
Left of the Screen 4/7 <--> Right X B/D
Right of the Screen 3/7 <--> Left X B/D

SCREEN DISPLAY
The screen doesn’t be shown as Data COF (Include not be shown part of Data COF quantity or a part)
The problem between Data COF and X B/D is more possible that the screen is not be shown as data COF.
  • Confirm the connector of Data COF is well connected to X B/D. Correspond to the part that screen is not showing.
  • Confirm whether the Data COF is failed and replace X B/D

Example of the screen display form.  (Anything of the 7 Data COF can be shown beside below pictures)


TO CHECK A DATA COF

If 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
SCREEN DISPLAY
  • Regular Stripe is generated about the Quantity of one Data COF IC or more

  1. 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
  2. In case of generating regular stripe about the quantity of two Data COF IC, that means the data which is conveyed from CTRL B/D doesn’t conveyed well.
  3. Confirm the XB/D connection connector plugged in well. Correspond to unusual screen.
  4. Replace relevant XB/D or CTRL B/D.

Relationship between screen and X B/D
Screen X B/D
Left of the Screen 4/7 <--> Right X B/D
Right of the Screen 3/7 <--> Left X B/D

The screen display has a problem for Scan FPC.
  1. It’s may be a problem between Scan FPC and Y B/D.
  2. Check the connection of Y B/D and Scan FPC.
  3. If the Scan IC is failed, replace the Y DRV B/D.
SCREEN DISPLAY
TO CHECK SCAN IC

Change the Vpp Pin into ANODE and GND Pin into CATHOD and then test the Diode with forward or reverse direction.

THE SCREEN HAS VERTICAL LINES WITH REGULAR GAP [A VERTICAL TYPE FLASH AT SPECIAL COLOR]
  • This is a problem about control B/D.
  • Replace Control B/D.
SCREEN DISPLAY


A DATA COPY IS HAPPENED INTO THE 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 FORMS

The screen has one or several vertical line
  • In this case, It isn't a problem about controller B/D or X B/D.

It may cause followings.
  1. It’s out of order a panel
  2. Open or short of DATA COF FPC attached panel
  3. It’s out of order a DATA COF attached panel

  • Replace Module.
SCREEN DISPLAY FORM

The screen has one or several horizontal line
  • In this case, it isn’t a problem about controller B/D or X B/D.
  • It may cause followings.

  1. It’s out of order a panel
  2. Open or short of SCAN FPC attached panel
  3. It’s out of order a SCAN IC attached panel

  • Replace Y DRV B/D
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.
The screen displays other color 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.
  1. Measuring Point of Y B/D: B103 (SUS_UP)
  2. Measuring Point of Z B/D: B37 (SUS_OUT)
A center of screen is darker than a edge of 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.
DISPLAY FORM
If doesn’t display a specified brightness at specified color
  • Check the connector of CTRL B/D input signal.
  • Replace the CTRL B/D.
There is a flickering picture displayed or no picture , but the green LED lights
  • Check or replace the LVDS cable.

There is a black screen in the TV mode
  • Check the FPC cable (between socket P201 and P203)

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