Troubleshooting; Self Diagnosis Operation; Check Point; A Board - Sony SS-SP50FW Service Manual

3-1. Self Diagnosis Operation

Check Items
Panel Communication error
FAN Abnormal
Temp. Abnormal
Voltage Abnormal *
*: There is abnormal state in any of 5 V/9 V/3.3 V/Vs/Va/12V that is output from the G board.

3-2. Check Point

3-2-1. A Board

LED symptoms
1. No LED flashing
Cause 1: G board can't supply 5 V.
(Check 3 and 4-pins of the CN9 on the A
board.)
→ Check the connector, or replace the G board.
Cause 2: Pattern on the A board is short.
→ Replace the A board or H2 board.
2. Only red LED lighting (No power on)
Cause 1: Check the 5 V line from the G board to the A
board.
(Check 1-pin of the CN9 on the A board.)
→ If the 5 V line is abnormal, check the
connector, or replace the G board. If it is ok,
replace the A board.
Cause 2: Micom halt
→ Replace the A board.
3. Only amber LED lighting (No power on)
Cause 1: Micom halt → Replace the A board.
4. Repeated blinking from red to green LED
flashing (No power on)
Cause 1: A board is damaged.
→ Replace the A board.
Cause 2: G board can't supply another voltage.
→ Replace the G board.
5. Blinking red LED many times.
Refer to Section 3-1.
FWD-50PX2
Section 3

Troubleshooting

Status
Power Off → LED Blinking 2 times
Power On → LED Blinking 3 times
Power Off → LED Blinking 4 times
Power Off → LED Blinking 5 times
Raster symptoms (If LED is ok)
1. No raster
(First check back raster if plasma display
panel is on)
Cause 1: If it is ok, replace the A board.
Cause 2: If it is not, replace the G board or plasma
display panel.
2. No raster at special mode.
Cause 1: Replace the A board.
Cause 2: If there is no raster after inputting the DVI
signal, check EDID.
3. Abnormal raster
Cause 1: When you change A board, it is abnormal.
→ Plasma display panel has problem.
Sound Symptoms
1. You can't hear sound output
Cause 1: Check 1 and 3-pins of the CN1 on the L board. If
it is ok, replace the L board.
The 3-pin of CN1 is the L/R output terminal of
the audio signal. Check the signal using the
oscilloscope. If there is no signal, the A board is
the cause of the trouble. Otherwise, the L board
is the cause of the trouble.
Cause 2: If it is not, replace the A board.
2. Abnormal sound
Cause 1: Replace the L board.
3-1