Display Defects; Unusual Pattern On Display; All, Or Half Of The Screen Is Not Shown; Data Tcp Ic Examination - Philips PDP42V7 series Service Manual

EN 16 5. LGE PDP
5.2.2

Display Defects

All, or Half of the Screen is Not Shown

• In case the entire screen is not shown:
1. Confirm if the 8-pin connection of the X to Z board is
plugged in correctly.
• In case half of the screen is not shown:
1. On the XR board:
– Confirm if the 60-pin connection of the CTRL board
to the XR board is plugged in correctly.
2. On the XL board:
– Confirm if the 5- pin connection of the XR board to
the XL board is plugged in correctly.
– Confirm if the 60-pin connection of the CTRL board
to the XL board is plugged in correctly.
3. Replace relevant X board.
Notes:
Relationship between Screen and X board:
Screen
Left half of the screen
Right half of the screen
Display
No Display
Figure 5-31 Screen display "1/2 display"
Vertical Parts of the Screen are Missing
1. This can be related to a problem between Data TCP and X
board.
2. Confirm that the connector of the Data TCP is well
connected to the X board (it corresponds to the part that
screen that is not shown).
3. Confirm whether the Data TCP is failed (inclusion
examination with the naked eye of blown ICs or others).
– If the IC failed: replace the module.
– In case of X board shorting or open PWB pattern: when
TCP IC is not defective, replace the X board.
Notes:
• Example of screen display (anyone of the 14 Data TCPs
can be shown).
Figure 5-32 Screen display "Vertical parts missing"
• How to examine Data TCP IC
– Change [1] "Va Power" into CATHOD, [2] "GND" into
ANODE, and then examine the diode in forward or
reverse direction.
Service Modes, Error Codes, and Fault Finding
X-board
Right X-board
Left X-board
F_15590_008.eps
060605
All
Partial
Not at all
F_15590_009.eps
040705
– Examine with the naked eye traces of blown ICs [3] or
others.
Figure 5-33 Data TCP IC examination

Unusual Pattern on Display

1. In case of generating unusual pattern of Data TCP IC unit
as shown in below picture, there is problem in the signal
(CLK, data STB) or connector that is input of Data TCP IC.
2. In case of "Case 1":
– Confirm the connection between Data TCP connector
and IC.
– Replace the relevant X board.
3. In case of "Case 2" or "Case 3":
– Confirm the Data TCP connectors and the connection
from CTRL to X board.
– Check the CTRL board and X board.
– Replace the relevant X board or CTRL board.
4. In case of "Case 4" or "Case 5":
– Check the connector from CTRL board to X board.
– Replace the relevant X board or CTRL board.
– Check the connection between Z and XR board (8-pin),
and between XR and XL board (5-pin power
connector).
Figure 5-34 Case 1
Figure 5-35 Case 2
F_15590_010.eps
040705
Unusual screen comes out
about one TCP IC quantity or more
F_15590_011.eps
040705
Unusual screen comes out
about 1/2 of screen or equal
distances of all screen
F_15590_012.eps
040705