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SERVICE BULLETIN
PRODUCT: Computer Monitor BULLETIN: MON 97-007 MODEL: CMB5477L
SUBJECT: Flyback Transformer Revisions
BACKGROUND: Samsung instituted new revision flyback transformers as of October 24, 1996. The new flyback transformer will prevent intermittent no raster conditions. The revised flyback transformers that have been applied to the latest production runs will have resistance values changed in the x-ray protection and the high voltage adjustment circuits. SOLUTION: When replacing a flyback transformer refer to the parts list below. The resistance values should be changed accordingly. If the resistance values are different from the flyback transformers listed below, intermittent no raster or shutdown conditions will exist. Refer back to the original parts list and schematic located in the service manual for any flyback transformer without a revision number or label on it. PARTS LIST: ORIGINAL
Location No. T402 Part No. BH26-10303V Description REV.04 FSA15A003 SAMSUNG 1/4W, 86k ohm 1/4W, 3.9k ohm 1/4W, 4.3k ohm Part No. BH26-10303V
NEW
Description REV.05 & REV.06 FSA-15A003 SAMSUNG 1/4W, 91k ohm 1/4W, 4.7k ohm 1/4W, 3.3k ohm
R516 R411 R412
2004-001319 2001-000054 2001-000722
2004-001349 2004-000899 2004-000698
Disclaimer: This information is provided "as is" without warranty of any kind either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.
REV 8-1
SERVICE BULLETIN
PRODUCT: Computer Monitor BULLETIN: MON 97-008 MODEL: CFG9637
SUBJECT: Video Pre-amp (LM1205) Failure Causing No OSD
BACKGROUND: The OSD blanking input stage of IC101 (LM1205) shorts to the Vcc input stage due to CRT discharging and surge current.
SOLUTION: Add a 7.5V zenor diode between pin 13 of IC101 and ground (cathode to pin 13 and anode to ground). Replace jumper wire JP104 with a 100 ohm ½ watt resistor. The resistor will act as a delay and improve the R,G,B surge absorbers discharge effect. Replace the 300V spark gaps at each of the Red, Green, and Blue cathodes of the CRT with 200V surge absorbers.
PARTS LIST: ORIGINAL
Location No.
NA JP104 SGR1 SGB1 SGG1
NEW
Description Part No.
0403-000366 2001-000028 4715-000102 4715-000102 4715-000102
Part No.
NA NA 4715-000106 4715-000106 4715-000106
Description
ZD 7.5V R-CF(S), 100 ohm, 1/2W 200V, Surge Absorber 200V, Surge Absorber 200V, Surge Absorber
NA JP104 300V, Surge Absorber 300V, Surge Absorber 300V, Surge Absorber
Disclaimer: This information is provided "as is" without warranty of any kind either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.
REV 8-1
SERVICE BULLETIN
PRODUCT: Computer Monitor BULLETIN: MON 97-009 MODEL: CMB5477L
SUBJECT: Video Pre-amp IC101 (LM1207) Failure
BACKGROUND: IC101 becomes damaged from arcing within the CRT during electronic discharge.
SOLUTION: Add a 300V spark gap in between the G1 grid of the CRT and ground. This will aid in reducing the discharge effect from the CRT.
PARTS LIST: ORIGINAL
Location No.
NA
NEW
Description
NA
Part No.
NA
Part No.
4715-000106
Description
300V, Surge Absorber
Disclaimer: This information is provided "as is" without warranty of any kind either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.
REV 8-1
SERVICE BULLETIN
PRODUCT: Computer Monitor BULLETIN: MON 97-010 MODEL: CQA4147, CQB4147
SUBJECT: No Raster
BACKGROUND: D618, which is the rectifier diode for the 166V line, burns due to a reverse peak voltage that occurs when power is turned off.
SOLUTION: A snubbing capacitor must be added in parallel with D618 in order to prevent this from occurring. This capacitor should be added to all CQB and CQA chassis as a preventative maintenance.
PARTS LIST: ORIGINAL
Location No.
C643
NEW
Description
NA
Part No.
NA
Part No.
2201-000012
Description
C-CERAMIC DISK, 220pf, 10%, 1KV
Disclaimer: This information is provided "as is" without warranty of any kind either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.
REV 8-1