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Scan IC Check
Check diode value of the right side part of the output pin.
Figure 5-20 Scan IC output diode check
5.1.6
Mis-discharge Defect
Most of mis-discharge appearance is a problem of the Y-DRV,
Y-SUS, or Z board.
Check these boards when mis-discharge occurs.
Figure 5-21 Mis-discharge
Checking Order
1. Check the Y-SUS and Z-SUS signal cables.
2. Check if the Y-DRV IC is defective.
3. Check the Y-SUS board voltages (-Vy, Vscw).
4. Check if the Y-SUS and/or Z-SUS IPMs are defective (see
paragraph "How to Check an IPM" below).
5. Replace the Control board.
How to Check an IPM
Forward direction
Measure between:
•
GND (+) and Sus-out (-).
•
Sus-out (+) and Vs (-).
When both test diode values are over 0.4 => OK.
Reverse direction
Measure between:
•
GND (-) and Sus-out (+).
•
Sus-out (-) and Vs (+).
When all test diode values are infinite => OK
Service Modes, Error Codes, and Fault Finding
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5.2
Detailed Module Check
5.2.1
No Display
The Screen Does Not Display a Picture
1. Check whether on the CTRL board LED (D12, D13, D14)
070705
is turned "ON" or not.
2. Check the power and signal cable of the CTRL board.
3. Check if the X, Y, and Z boards are plugged in correctly.
4. Check the connection of the X, Y, and Z boards to the
CTRL board.
5. Measure the output wave of X, Y, and Z boards with an
oscilloscope (> 200 MHz) and find the troubled board by
comparing the output wave with the figures below.
–
Measuring point for the Y board: TP ("Waveform" on
the Y-Driver board).
–
Measuring point for the Z board: TP (bead B28).
6. Check the SCAN (Y side) IC.
7. Check the DATA (X side) TCP IC.
8. Replace the CTRL board.
LGE PDP 2K6
5.
Figure 5-22 IPM check
EN 17
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