Text preview for : MON95-002.pdf part of samsung all service bulletin monitor samsung - 2of3 zip



Back to : service_samsung02.zip | Home

SERVICE BULLETIN
PRODUCT: Computer Monitor BULLETIN: Monitor 95-002 MODEL: CSR5987

SUBJECT: CRT Substitution BACKGROUND: When replacing a CRT for this model, the vendor CRT may be substituted with either a Toshiba or Samsung.

SOLUTION: Parts must also be substituted in the heater and deflection circuits. Substitute parts are listed in the parts list below according to the CRT manufacturer.

PARTS LIST:
Location No.
CRT

15" Toshiba CRT
M36KUT23XX02 (CODE NO. : 897-250125AA) CAP-MPPF, 400V, 304J (CODE NO. : 916-656300TJAX) CAP-MPPF, 400V, 274J (CODE NO. : 916-656270TJAX) NONE

15" Samsung CRT
M36KUK35XX02 (CODE NO. : 897-250134AA) CAP-MPPF, 400V, 274J (CODE NO : 916-656270TJAX) CAP-MPPF, 400V, 224J (CODE NO. : 01518-343-224) REF-CF, 1/2W, 5%, 470 ohm (CODE NO. : 911-134707FF) REF-MO, 3W, 5%, 1.6 ohm CODE NO. : 911-311507LFXA) COIL, H-LINEARITY, 4.2uH (CODE NO. : BH27-20003A) ZENOR DIODE UZ5.6V (CODE NO. : 893-299004AE)

C447

C442

R324

R639

REF-MO, 3W, 5%, 4.7 ohm (CODE NO. : 911-314707LF) COIL, H-LINEARITY, 6.7uH (CODE NO. : 925-460187AB) ZENOR DIODE UZ5.1V (CODE NO. : 893-290031AB)

L404

D302

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 10-1

SERVICE BULLETIN
PRODUCT: Computer Monitor BULLETIN: Monitor 95-003 MODEL: CMG7377L

SUBJECT: CRT Substitution BACKGROUND: Samsung is supplying three different CRT manufacturers with the CMG7377L monitor. Parts differ in the heater, high voltage, and deflection circuits as well as the degaussing coil rating.

SOLUTION: The parts that differ from each other are listed in the parts list below.

PARTS LIST: See the back of this cover page.

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 10-1

Location No.
CRT

Hitachi CRT

SDD CRT

Mitsubishi CRT
(TYPE:M41KXH100X06) (CODE : 897-250171AA) FSW-17002A (CODE : BH26-10003A) REF-CF,100K, 5%,1/6W (CODE : 911-16100YA) REF-FUSIBLE, 2.2 (CODE : 2008-000002) TRANS-FOCUS, 100/850T (CODE : BH26-30018A) R-CAR, 2.2K, 1/6W (CODE : 911-142207QJAL) C-MPP, 250V, 274J 916-656270QJAL) SPARK GAP, 1KV (CODE : 04569-001-110) JUMPER WIRE

(TYPE:M41KVZ680X72) (TYPE:M41KUN36X01) (CODE : 897-250144CA(UQ) (CODE : 897-250183AA) FSW-17A002 (CODE : 923-460167BA) REF-CF, 180K, 5%, 1/6W (CODE : 911-161607YA) REF-FUSIBLE, 1..8, 5% (CODE : 911-611807LA) TRANS-FOCUS, 100/650T (CODE : 923-480157GA) REF-CF, 3.9K, 5%, 1/6W (CODE : 911-143907YA) CAP-MPP, 250V, 104J (CODE : 916-656100QJAL) DSP-301N (CODE : 04569-002-210) DSP-301N (CODE : 04569-002-210) D-COIL, 8.45MH,9.45 0HM (CODE : 925-460193CA) REF-CF, 18K, 5%, 1/6W (CODE : 911-151807YA) FSW-17002 (CODE : 923-460167BA) REF-CF, 220K, 5%, 1/6W (CODE : 911-162207Y) REF-FUSIBLE, 1.8, 5% (CODE : 911-811807LA) TRANS-FOCUS, 100/600T (CODE : 923-480167HA) REF-CF, 3.9K, 5%, 1/6W (CODE : 911-143907YA) CAP-MPP, 250V, 104J (CODE : 916-656100QJAL) DSP-301N (CODE : 04569-002-210) DSP-301N (CODE : 04569-002-210) D-COIL, 8.45MH,9.45 0HM (CODE : 925-460193CA) REF-CF-C, 27K, 5%, 1/6W (CODE : 911-162707YA)

FBT

R527

R616

T504

R215

C428

SK501

SK502

D-COIL

D-COIL, 102T, 12.6 OHM (CODE : BH27-10006A REF-CF, 18K, 5%, 1/6W (CODE : 911-161807YA)

R326

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 10-1

SERVICE BULLETIN
PRODUCT: Computer Monitor BULLETIN: Monitor 95-004 MODEL: CMB5477L

SUBJECT: CRT Substitution BACKGROUND: Samsung is manufacturing the CMB5477L with three different manufacturer's CRTs. Each type of CRT has parts that differ in the heater, brightness, and the deflection circuits.

SOLUTION: The parts that differ from each other are listed in the parts list below.

PARTS LIST: See the back of this cover page.

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 10-1

Location No.
CRT

Phillips CRT
TYPE : M36EDR320X (CODE : 897-250089AA) R-CAR, 10K, 1/6W (CODE : 911-151007YA) R-CAR, 15K, 1/6W (CODE : 911-151507AA) R-M, OXIDE, 1.5, 3W (CODE : 911-311507LFXA) R-CAR, 100K, 1/6W (CODE : 911-161007YA) JUMPER WIRE

Toshiba CRT
TYPE : M36KUT23XX01 (CODE : 897-250192AA) R-CAR, 15K, 1/6W (CODE : 911-151507AA) R-CAR, 10K, 1/6W (CODE : 911-151007YA) R-M, OXIDE, 1.2, 3W (CODE : 911-311207JF) R-CAR, 75K, 1/6W (CODE : 911-157507YA) R-CAR, 27K, 1/6W (CODE : 911-152707YA COIL-CHOKE, 100UH (CODE : 925-460192BA) R-M, OXIDE, 2.7, 3W (CODE : 911-312707LF) R-M, OXIDE, 3.9, 3W (CODE : 911-313907LF) R-CAR, 470, 1/2W (CODE : 911-134707FF) C-M, P.P, 1.6KV, 552-J (CODE : 916-944550YJAX) R-M, OXIDE, 180, 2W (CODE : 911-331807JF) NONE

SDD CRT
TYPE : M36KUK35X02 (CODE : 897-250134AA) R-CAR, 15K, 1/6W (CODE : 911-151507AA) R-CAR, 15K, 1/6W (CODE : 911-151507AA) R-M, OXIDE, 1.2, 3W (CODE : 911-311207JF) R-CAR, 100K, 1/6W (CODE : 911-161007YA) JUMPER WIRE

R209

R463

R461

R184

JP25

L403

COIL-CHOKE, 57UH (CODE : 925-460191FA) R-M, OXIDE, 2.7, 3W (CODE : 911-312707LF) R-M, OXIDE, 3.9, 3W (CODE : 911-313907LF) R-CAR, 470, 1/2W (CODE : 911-134707FF) C-M, P.P, 1.6KV, 552-J (CODE : 916-944550YJAX) R-M, OXIDE, 180, 2W (CODE : 911-331807JF) NONE

COIL-CHOKE, 100UH (CODE : 925-460192BA) R-M, OXIDE, 1.5, 3W (CODE : 911-311507LFXA) R-M, OXIDE, 1.5, 3W (CODE : 911-311507LFXA) R-CAR, 330, 1/2W (CODE : 911-133307FF) C-M, P.P, 1.6KV, 502-J (CODE : 916-354560YJAX) R-M, OXIDE, 75, 2W (CODE : 911-331807JA) RGP02-12 (CODE : 02169-206-297) R-M.F, 24K, 1/4W (CODE : 911-452405DA) R-M, OXIDE, 1.5, 2W (CODE : 911-311507JF) R-M, OXIDE, 1.5, 2W (CODE : 911-311507JF) H-LIN, COIL, 4.7UH (CODE : BH26-30027A) H-PULSE, TRANS, 1.5MH (CODE : BH26-30023A) C-POLY, 100V, 182-J (CODE : 916-164180LJAH) R-CAR, 4.7K, 1/6W (CODE : 911-144107YA)

R630

R631

R307

C461

R472

D428

R414

R-M.F, 22K, 1/4W (CODE : 911-452205DA) R-M, OXIDE, 1.2, 2W (CODE : 911-311207JF) R-M, OXIDE, 1.2, 2W (CODE : 911-311207JF) H-LIN, COIL, 4.9UH (CODE : 923-460191EA) H-PULSE, TRANS, 1.0MH (CODE : 923-460169DA) C-POLY, 100V, 102-J (CODE : 916-164100LJAH) R-CAR, 9.1K, 1/6W (CODE : 911-149107YA)

R-M.F, 24K, 1/4W (CODE : 911-452405DA) R-M, OXIDE, 1.5, 2W (CODE : 911-311507JF) R-M, OXIDE, 1.5, 2W (CODE : 911-311507JF) H-LIN, COIL, 4.9UH (CODE : 923-460191EA) H-PULSE, TRANS, 1.5MH (CODE : BH26-30023A) C-POLY, 100V, 182-J (CODE : 916-164180LJAH) R-CAR, 4.7K, 1/6W (CODE : 911-144107YA)

R444

R422

L407

T403

C419

R207

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 10-1

SERVICE BULLETIN
PRODUCT: Computer Monitor BULLETIN: Monitor 95-005 MODEL: Samtron SC-428PS

SUBJECT: Vertical Deflection Circuit Improvement BACKGROUND: The Samtron 14 inch computer monitor SC-428PS has no vertical deflection after power up due to IC301 (TDA4866) and R301 failing. The problem is likely to occur with the serial number range of A9524002821 to A9538025160. Serial numbers after A9538025160 use a different IC301 (TDA8351). These are not interchangable without making various circuit changes to meet the specifications of the new IC301.

SOLUTION: The counter measure to keep the original IC301 (TDA4866) from failing is done by improving the grounding on the monitor. Two ground lugs and two additional ground wires have been added. See the attached page for mounting procedures.

PARTS LIST: Below are the parts added to Serial Number Range A9524002821 to A9538025160 Location No. None Part No. 3621200274 Description Wireform UL1015-AWG 22 200 mm BK GND Lug 54 X 18 X 30 X 0.35T

None

3112400051

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 9-1

Mounting Procedure - Add a ground lug to point A and point D as in the figure shown below. Take the 200mm wires and route them through the holes labeled E and F in the main pcb as in the diagram below. The holes are located next to the IC301 heatsink. Solder the 200mm wires to the heatsink solder connection located nearest to the routed wire hole. The other end of the 200mm wires are to be soldered to the CRT ground wire as shown below.

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 9-1

SERVICE BULLETIN
PRODUCT: Computer Monitor BULLETIN: Monitor 95-006 MODEL: Samtron SC-428PS

SUBJECT: Vertical Circuit Modification BACKGROUND: The vertical output IC301 has been changed from a TDA4866 to a TDA8351. The circuit change was made with serial numbers higher than A95025160. The circuit change was made due to the failure of IC301 in some cases during power up. SOLUTION: The circuitry around IC301 was changed to meet the specifications of the TDA8351. PARTS LIST:
SN. A9524002821 TO A9538025160 Location No.
C306

SN. A9538026160 TO ? Part No.
1218204707

Part No.
NONE

Description
NONE

Description
C-CERAMIC 47PF, 50V R-CARBON 4.2K, 1/6W R-CARBON 220, 1/4W R-CARBON 1, 1W R-CARBON 1, 1W IC, TDA8351

R310

NONE

NONE

1412104229

R303

1413401021

R-CARBON 1K, 1/4W R-CARBON 1, 1/2W R-CARBON 0.5, 1/2W IC, TDA4866

1413402214

R304

1414201R01

1433601R0B

R307

141420R508

1433601R0B

IC301

2332290235

2332190339

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 11-1

SERVICE BULLETIN
PRODUCT: COMPUTER MONITOR BULLETIN: MONITOR 95-007 MODEL: CQB4147

SUBJECT: No Raster BACKGROUND:There is a delay in the 12V/DC operation. Due to the delay the 166V/DC line operates first when power is first applied to the monitor. This will affect the horizontal circuit and cause a surge, which in turn will cause Q403 and Q408 to short.

SOLUTION: Insert a IN4937 diode into location D300 and substitute R401 (33 ohm, 1/2W) with a 220 uH coil.

PARTS LIST:

Original Parts
Location R401 D300 Parts Code Description

New Parts
Parts Code Description

911-123307FF R-Carbon, 33, 1/2w None None

925-001001AN Coil, 220 uH 893-314937AC Diode, IN4937

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 12-1

SERVICE BULLETIN
PRODUCT: COMPUTER MONITOR BULLETIN: MONITOR 95-008 MODEL: SAMTRON SC-428PT/L

SUBJECT: No Raster BACKGROUND:There is a delay in the 12V/DC operation. Due to the delay the 166V/DC line operates first when power is first applied to the monitor. This will affect the horizontal circuit and cause a surge, which in turn will cause Q403 and Q408 to short.

SOLUTION: Insert a IN4937 diode into location D300 and substitute R401 (33 ohm, 1/2W) with a 220 uH coil.

PARTS LIST:

Original Parts
Location R401 D300 Parts Code Description

New Parts
Parts Code Description

911-123307FF R-Carbon, 33, 1/2w None None

925-001001AN Coil, 220 uH 893-314937AC Diode, IN4937

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 12-1

SERVICE BULLETIN
PRODUCT: Computer Monitor BULLETIN: MON 97-001 MODEL: CQB4147

SUBJECT: Reduce Q404 Failure Rate Causing No Raster

BACKGROUND: Q404 fails when the monitor changes from the DPMS Suspend mode back to Normal operation. Q415 is designed, in the circuit, to cut off horizontal drive to the base of Q404. This is achieved by turning Q415 on in the Suspend mode. In normal operation, Q415 is turned off. There is a delay in turning Q415 off by approximately 15 ms. This will cause an abnormal pulse at the base of Q404, causing damage to the transistor.

SOLUTION: The base current limiting resistance to Q415 has been changed by decreasing the values of R200 and R461.

PARTS LIST: ORIGINAL
Location No. R200 R461 Part No. 2001-000056 2001-000056 Description R-CF 4.7K, 1/6W R-CF 4.7K, 1/6W Part No. 2001-000043 2001-000029

NEW
Description R-CF 1K, 1/6W R-CF 100 OHM, 1/6W

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 5-1

SERVICE BULLETIN
PRODUCT: Computer Monitor BULLETIN: MON 97-002 MODEL: CMH7379L

SUBJECT: To prevent whistling sound from occurring.
BACKGROUND: A whistling sound is created from harmonic noise generated between T402, L402, and the main PCB near the Flyback Transformer. SOLUTION: Add a piece of rubber to insulate the main PCB solder side from the bottom metal shield. See Illustration below showing the section of the PCB where the rubber will be located.

PARTS LIST: Part No. BH61-30303A Description RUBBER

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 5-1

SERVICE BULLETIN
PRODUCT: Computer Monitor BULLETIN: MON 97-003 MODEL: CQB4147

SUBJECT: Improve the Horizontal Output Transistor Quality

BACKGROUND: The horizontal output for the CQB4147 has been changed as of May 1, 1997. The BU2508DF, which had been used prior to this date, has been failing intermittently due to a current surge from the 166 volt B+ line. The current surge is caused mainly from the DPMS off mode recovery. SOLUTION: The circuit has been improved by using a 2SC5149, which has a higher hfe than the originally used BU2508DF.

PARTS LIST: ORIGINAL
Location No. Q403 Part No. 0502-000007 Description BU2508DF Part No. 0502-000005

NEW
Description 2SC5149

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 5-1

SERVICE BULLETIN
PRODUCT: Computer Monitor BULLETIN: MON 97-004 MODEL: CFX1577L

SUBJECT: Vertical Positioning Shifted Off Center

BACKGROUND: Q302 and R327 fail in the vertical positioning circuit. The failure is caused by a current surge during power up and from the monitor recovering from an extended period in the DPMS Suspend mode.

SOLUTION: Replace Q302, Q303, and R327 with different ratings. Production went under these changes as of February 1, 1997. Observe the pin configuration when replacing Q302.

PARTS LIST: ORIGINAL
Location No. Q302 Q303 R327 Part No. 0501-000586 0501-000008 2001-000526 Description KSC945, 150mA KSC733C, 150mA R-CARBON, 1/6 W Part No. 0502-000006 0501-000294 2003-000590

NEW
Description KSC1507, 200mA KSA708, 700mA MO, 2W, 22 ohm

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.

REV8-1

SERVICE BULLETIN
PRODUCT: Computer Monitor BULLETIN: MON 97-005 MODEL: CMH7379L

SUBJECT: Q407 Failure Causing No Raster or Small Horizontal Size

BACKGROUND: Q407 fails due to a transient pulse and current when mode switching from DOS to Windows. This occurs with a Matrox video card installed in the computer.

SOLUTION: Add a sub-PCB assembly as in figures 1 and 2 and a snubbing circuit for the horizontal output as in figure 3.

PARTS LIST:

ORIGINAL
Location No.
NA NA NA NA NA NA

NEW
Description
NA NA NA NA NA NA

Part No.
NA NA NA NA NA NA

Part No.
BH92-50106J BH39-40355S 6003-000129 0401-000005 0402-000012 2003-000009

Description
SUB-PCB ASSEMBLY 4 PIN CBF-HARNESS TAPTITE SCREW 1N4148 DIODE UF4007 DIODE 220 OMHS, 1 WATT

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

Figure 1 Top View of the Main Board

Figure 2 Bottom View of the Main Board

Figure 3 Snubbing Circuits

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 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