Shutdown; Intermittent Bar Across Screen (C_P0223).pdf

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CONFIDENTIAL
Service Bulletin
Computer Monitors
â
CSI-111
Sony Service Company
National Technical Services
A Division of Sony Electronics Inc.
Park Ridge, New Jersey 07656
223R1
Model:
CPD-100ES, CPD-200ES
No.
Subject:
Shutdown; Intermittent Bar Across Screen
Date:
April 26, 1999
Symptom:
(111X)
Unit exhibits black bar across screen followed by shutdown condition. Symptom
occurs after warm up or with low AC input. Q602 Switching Regulator Output in the
power supply circuit may fail due to excessive stress. The stress may be caused by
faulty protection components D603 or R609 or C620/R609 Wire Jumper.
Solution:
If the customer complains of this symptom, then please perform the following
procedures to check Q602 and the protective components D603, R609, and the
C620/R609 Wire Jumper.
NOTE: The following components (or equivalent) may be required to complete the
procedures listed below.
REF
DESCRIPTION
PART NUMBER
Q602
TRANS IRFIBC40
8-729-926-79
D603
Diode RD18ESB2
8-719-110-49
R609
MO 0.22
W
5% 3W
1-216-381-11
C610
CER 560 pF 10% 50V
1-102-115-00
NA
2.5 Inch No. 22 AWG Jumper
Wire Type FR-1 or VW-1 or F
And CSA Certified.
1-900-801-67
DEAD UNIT TROUBLESHOOTING PROCEDURE
1.
Remove AC power and access the D Board.
2.
Discharge the AC Rectifier Cap. C620.
3.
Measure the resistance of R609. It should be 0.22
W
±5%.
4.
Check Q602 for shorts or excessive leakage.
5.
Check D603 for open condition or excessive leakage.
6.
Check C610 to verify the value is correct.
7.
Replace any failed or incorrect components.
8. Assemble the unit and verify basic operation.
The Dead unit Troubleshooting Procedure is completed.
Continue to the Over Current Condition Detection procedure.
CONT.
Reference: FPR: T0609, R. Blanchard, J. Grose
PRINTED IN USA
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Computer Monitors Service Bulletin No. 223 R1
OVER CURRENT CONDITION DETECTION PROCEDURE
1. Connect the computer monitor AC input to an Isolated Variable AC power supply.
Set the AC supply to 120 VAC.
2.
Apply a flat field video input signal in Mode 7. Check the picture dimensions.
3. Vary the AC input power supply voltage from 120 VAC to 95 VAC. Check if the
picture horizontal size gets smaller when the AC input level is decreased.
CAUTION
The following Steps require measuring signals in the active AC input circuits.
These circuits include hazardous voltage levels. Use an oscilloscope with a
Floating Ground. Use the Floating Ground method only with suitable
equipment and careful procedures. Avoid body contact with conductive parts.
4. If the horizontal size is reduced in Step 3, then use a Floating Ground
oscilloscope to measure the waveform at pin 7 of IC601. The peak voltage should be
less than 0.8 volts. Refer to the following illustrations.
Correct Waveform on Pin 7 of IC601
5. If the waveform exhibits a peak voltage greater than 1.0 volts, then over current
protection will occur. Refer to the following illustration.
CONT.
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Computer Monitors Service Bulletin No. 223 R1
Incorrect Waveform on Pin 7 of IC601
The Over Current Condition Detection Procedure is completed. Continue to the Over
Current Condition Correction Procedure if required.
OVER CURRENT CONDITION CORRECTION PROCEDURE
1.
Remove the AC power and access the D Board.
2. Discharge the AC Rectifier Cap. C620.
3. To correct the over current condition, remove the brown jumper wire found between
T601 and Q602. Refer to the following illustration
4. Either replace the jumper wire with a good one, or dress the wire and pin connector
with solder. Insure that the solder flows into the wire and remains inside the pins. Re-
solder the Jumper Wire to the D-board. Check that there are no cold solder connections.
5.
Assemble the unit. Verify correct operation in all modes and AC voltage conditions.
LOCATION OF C620/R609 JUMPER
C620/R609 JUMPER
The correction procedure is completed.
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