Samsung CSR5987, Сервисный бюллетень

Страница: 20 / 22

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 NEW
Location No. Part No. Description Part No. Description
NA NA NA 0403-000366 ZD 7.5V
JP104 NA JP104 2001-000028 R-CF(S), 100 ohm, 1/2W
SGR1 4715-000106 300V, Surge Absorber 4715-000102 200V, Surge Absorber
SGB1 4715-000106 300V, Surge Absorber 4715-000102 200V, Surge Absorber
SGG1 4715-000106 300V, Surge Absorber 4715-000102 200V, Surge Absorber