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If you are not familiar with electronics, do not attempt to repair. Whether you suffer fatal electrical shock! Instead, contact any experienced service technician, or the nearest service center.
LED BLINKING CODES
When an abnormality has occurred in the unit, the protection circuit operates and shuts off the power supply. The faulty area can be identified by the number of flashes of the Power LED at the front of the unit
SELF CHECK DISPLAY
- Self-check is used to automatically check the bus line controlled circuits of the Plasma display.
- To get into the Self-check mode, press and hold the Volume Down button on the front of the unit, then the OFF-TIMER button on the remote control.
- In case the H, HY or HZ boards are disconnected, “IC3699 - -” is displayed.
The Plasma Display Panel unit may develop a
failure, where the symptom is localized in a particular area of the screen. The
figure below can help localize the circuit board that is most likely to be
defective. In the example in figure , one of the two boards, C3 and D2 is
likely to be the cause.
- The use of a magnifying glass can help localize the defective printed circuit board. Use the magnifying glass to take a close look at the pixels of the screen.
- If the pixels are totally dark, the defect is most likely located in one of the following boards:
SU-Board
SD-Board
- Check the status of the LED located on the SC-Board; if the LED is dark, a malfunction of the SC-Board is suspected.
- Listen to the buzz noise of the SC board; if the buzz noise is not present, a malfunction of the SC-Board is suspected.
- Check the Scan pulse waveform at TPSC1. (Use TPSS1 of the SS-board to trigger the oscilloscope.)
- Verify the input signals at connector SC2, SC4, SC20 and SC21.
- Verify that the signals of the clock and serial data lines from the D-board are present at connector SC20 and SC21.
SS BOARD
No picture (black Screen) Case-2
No picture (black Screen) Case-2
- The use of a magnifying glass can help localize the defective printed circuit board. Use the magnifying glass to take a close look at the pixels of the screen.
- If the pixels are faintly lit, the defect is most likely located in one of the following boards:
SS2-Board
S3-Board
- Check the status of the LED located on the SS-Board; if the LED is dark, a malfunction of the SS-Board is suspected.
- Listen to the buzz noise of the SS-board. If the buzz noise is not present, a malfunction of the SS-Board is suspected.
- Verify the input signals at connector SS3 and SS1.
- Check the Scan pulse waveform at TPSC1 of the SC-Board. (Use TPSS1 of the SS board to trigger the oscilloscope.)
- Proceed to check the power sources at connector SS11, SS12 and SS33.
- Verify that the clock and serial data lines from the D board are present at connector SS33.
HORIZONTAL BACK BAR [COMPLETELY DARK]
The use of
a magnifying glass can help localize
the defective printed circuit board. Use the magnifying glass to take a close
look at the pixels in
the area of the black bar.
- If the pixels are totally dark, the defect is most likely located in one of the following boards
SU Board
(upper half of the screen only)
SD Board
(lower half of the screen only)
- If the pixels are dimly lit, the defect is most likely located in one of the following boards
SS2 Board
(upper half of the screen only)
SS3 Board
(lower half of the screen only)
Contd:
