PANASONIC TH-42PHD5 – PANASONIC TH-50PHD5 PANASONIC TH-42PHW5 – PANASONIC TH50PHW5
PANASONIC PLASMA TV TROUBLESHOOTING
TROUBLESHOOTING
No picture (black Screen)
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.
1. If the pixels are totally dark, the defect is most likely located in one of the following boards:
a) SC-Board
b) SU-Board
c) SD-Board
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.
1. If the pixels are totally dark, the defect is most likely located in one of the following boards:
a) SC-Board
b) SU-Board
c) SD-Board
1. Check the status
of the LED located on the SC-Board; if the LED is dark, a malfunction of the
SC-Board is suspected.
2. Listen to the buzz
noise of the SC board; if the buzz noise is not present, a malfunction of the
SC-Board is suspected.
Suggestions: 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.
Verify that the signals of the clock and serial data lines from the D-board are present at connector SC20 and SC21.
No picture (black Screen)
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:
A) SS-Board
B) SS2-Board
C) S3-Board
A) SS-Board
B) SS2-Board
C) S3-Board
1. Check the status of the LED located on the SS-Board; if the LED is
dark, a malfunction of the SS-Board is suspected.
2. Listen to the buzz noise of the SS-board. If the buzz noise is not present, a malfunction of the SS-Board is suspected.
3. Verify the input signals at connector SS3 and SS1.
2. Listen to the buzz noise of the SS-board. If the buzz noise is not present, a malfunction of the SS-Board is suspected.
3. Verify the input signals at connector SS3 and SS1.
Suggestions: Check
the Scan pulse waveform at TPSC1 of the SC-Board. (Use TPSS1 of the SSboard 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 Dboard are present at connector SS33. Note: It is easier to measure input levels at connector C33 of the C3- Board instead of connector SS33.
Verify that the clock and serial data lines from the Dboard are present at connector SS33. Note: It is easier to measure input levels at connector C33 of the C3- Board instead of connector SS33.
Horizontal Black Bar (Completely
dark)
Note: 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. 1 If the pixels are totally dark, the defect is most likely located in one
of the following boards:
a) SC Board
b) SU Board (upper half of the screen only)
c) SD Board (lower half of the screen only)
2. If the pixels are dimly lit, the defect is most likely located in one of the following boards:
a) SS Board
b) SS2 Board (upper half of the screen only)
c) SS3 Board (lower half of the screen only)
a) SC Board
b) SU Board (upper half of the screen only)
c) SD Board (lower half of the screen only)
2. If the pixels are dimly lit, the defect is most likely located in one of the following boards:
a) SS Board
b) SS2 Board (upper half of the screen only)
c) SS3 Board (lower half of the screen only)
Vertical Black BarSince the C2 board contains
the serial to parallel converters for the picture data that drive this portion
of the screen; the most likely cause for this defect can be localized to the
C2-Board or the D2-Board
Vertical Black Bar
Suggestion: Since the
C3 board contains the serial to parallel converters for the picture data that drive
this portion of the screen; the most likely cause for this defect can be localized
to the C3-Board or the D2-Board
No OSD but it has video.
Suggestion: Check signal on the D1 board.
Suggestion: Check signal on the D1 board.
Burned image
(pattern) is visible.
(pattern) is visible.
Activate the scroll bar or run the set with a
white raster for at least fifteen minutes.
BOARD LAYOUT
