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Table of Contents
Related Manuals for Daewoo 715B
Summary of Contents for Daewoo 715B
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Page 1: Service Manual
Service Manual XGA COLOR MONITOR Model : 715B DAEWOO ELECTRONICS CO., LTD. -
Page 2: Pin Connector
PIN CONNECTOR Signal Green Blue GND - Red GND - Green GND - Blue +5Vdc Arrangement of 15-pin D-sub connector GND - H.Sync GND - V.Sync Bi-directional Data (SDA) Horizontal Sync Vertical Sync (VCLK) Data Clock (SCL) CAUTIONS FOR ADJUSTMENT AND REPAIR •... -
Page 3: Operation And Adjustment
OPERATION AND ADJUSTMENT Control Panel A D J U S T SELECT MENU MENU • Launch OSD(On-Screen Display) MENU window. SELECT • Select a sub Menu & function. • Move a sub Menu & function. • Increase the value of any selected function. •... -
Page 4: Key Process
Key Process MENU SELECT MENU MENU MENU OSD OFF • When you choose the icon on the OSD window, you can exit the OSD screen. -
Page 5: Osd Functions
OSD Functions ICON CONTROL FUNCTIONS Adjust the position of the display horizontally (left or right). H. POSITION Adjust the position of the display vertically (up or down). V. POSITION H.SIZE Adjust the display width (horizontal size). Adjust the display height (vertical size). V.SIZE Adjust the vertical linearity. - Page 6 ICON CONTROL FUNCTIONS Choose different preset color temperatures or set your own customized color parameters. COLOR TEMP Adjust the red gain. RED GAIN Adjust the green gain. GREEN GAIN Adjust the blue gain. BLUE GAIN Adjust the red bias. RED BIAS Adjust the green bias.
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Page 7: Alignment Procedure
ALIGNMENT PROCEDURE Standard Adjustment Conditions 1. Power source voltage : AC 120V, 60Hz/AC 220V, 50Hz. 2. Aging : Take at least 20 minutes warm-up time. 3. Signals. Video : Analog 0.7Vpp 75Ω terminal positive polarity Synchronizing : TTL Level Negative/Positive Separate/Composite Deflection frequency Horizontal Frequency : 30KHz - 70KHz Vertical Frequency : 50Hz - 160Hz... - Page 8 (h) Select the R, G, B gain on the OSD menu and adjust the +/– key to get the color coordinates in X=0.281±0.02, Y=0.311±0.02. (i) Adjust the sub contrast (ABL) control to get the screen luminosity to 30.0 Ft/L. 6. Static Convergence Adjustment (a) Apply a magenta cross hatch pattern on display.
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Page 9: Troubleshooting Hints
TROUBLESHOOTING HINTS 1. No Character No Character Are the Change the Contrast & Contrast & Brightness control to Brightness Controls maximum maximum Is whole Refer to No Raster screen bright? No Raster Is CRT Check the peripheral circuit Cathode (Rk, Gk, Bk) of CRT Board signal level Rk, Gk, Bk... - Page 10 2. No Raster No Raster Is Heater Is CRT Trouble in Voltage (CRT PWB) heater red-hot? about 6V? Turn the Brightness Trouble in Refer to trouble in & Contrast control power supply power supply unit. circuit to set Maximum Is whole Trouble in power screen bright? supply circuit...
- Page 11 3. A Missing Color One color is missing Is input signal Check video signal normal? cable or video card. 0.7Vpp Is the output of pre-amp Trouble in IC801 or its (IC801, KA2500) ambient circuit pin 21, 24, 26 all normal? Trouble in Is video video output...
- Page 12 4. Abnormal OSD Font Abnormal OSD Font * If menu key selected. Is menu Trouble in Is Heater key selected? Heater voltage Voltage about 6V? Is OSD Font line. exist? Refer to trouble in P.S.U One color is Troubie in missing IC803 or its ambient circuit...
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Page 13: Horizontal Output Circuit
5. Horizontal Output Circuit Trouble in Horizontal output circuit (No Raster) Is the B+line voltage Trouble in 175V line. over 175V? Is the H-out waveform of IC501 Trouble in IC501 normal? Is the Gate wave form of Trouble in Q551, Q552 Q553 normal? Is the Drain Trouble in Q553... -
Page 14: Unstable Picture
6. Unstable Picture 6-1. Horizontal Unstable picture Is H.Sync Check H.Sync Out of input pin of IC501 Micom or its ambient correct? circuits. Trouble in IC501... - Page 15 6-2. Vertical Unstable or Abnormal picture Check PWR – 13V – 13V DC line ambient circuit. correct? the output 45Vp-p Check V.DY waveform of IC401 and ambient circuit. (pin 5) normal? Is the output pulse Check the IC401 of IC501 (pin 4) or ambient circuit.
- Page 16 7. Focus Monitor remains unfocused Check Focus VR in focus acceptable? Trouble in Focus circuit (FBT)
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Page 17: Dynamic Focus
7-1. Dynamic Focus * Check after adjusting the static focus Focus is poor ORION : 300V 150V finely by VR in FBT waveform Is the 1. Check the CRT socket waveform of the or connector wire DF pin in FBT 2. - Page 18 8. Convergence Poor convergence convergence Adjust static on the center area convergence bad? Refer to Adjustment procedure of convergence Adjust D.Y convergence on the Location fringe area bad?
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Page 19: Abnormal Picture
9. Abnormal Picture 9-1. Horizontal Size Abnormal H.Size Is the HV 25.8KV? Adjust the HV VR601 Check the IC501 and R503, C507... -
Page 20: Vertical Size
9-2. Vertical Size Abnormal V.Size Check the IC401 changeable the the 3.5Vdc of pin and its DC voltage of 4 of the IC501? IC401 pin 1? ambient circuit Trouble V.OSC/ Check the IC501 and Deflection Circuit its ambient circuit Refer to V.OSC/Deflection circuit... -
Page 21: High Voltage Output Circuit
10. High Voltage Output Circuit Trouble in H.V circuit (No Raster) Trouble in power 175V line supply circuit voltage normal? Is Q601 Trouble in Q601 or FBT Gate waveform normal? Is Q604, Q603 Trouble in Q603, Q604 Base waveform 12V Line normal? Is IC601 pin 10... - Page 22 11. Side-Pincushion Circuit Side-Pincusion distortion is excessive or barrel Select the side-pincushion icon on OSD menu, and adjust acceptable position. Check IC501 or Is the pin 5 their ambient circuit waveform of IC501 (pin 13, 14) correct Trouble in IC501...
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Page 23: Power Supply Unit (Psu)
12. Power Supply Unit (P.S.U) Trouble in P.S.U power switch Switch on Check the power cord outlet fuse F001 and diode D001, D002, O.K? D003, D004 Trouble in D001, D002, voltage of T001 D003, D004, C004 and pin 8 130V TH001. - Page 24 Is voltage Trouble in D103 or of C117 14.3Vdc? horizontal Part. Trouble in D643 or vertical voltage of C643 Part. -15Vdc? Is voltage of C112 Trouble in D105 25Vdc? P.S.U O.K...
- Page 25 VIDEO VIDEO OUTPUT PREAMP AMP & BIAS OSD IC KA2500 TDA9532 KS2508 H,V SYNC. SCL, SDA SCREEN H. VTG V. DRV. AMP FOCUS V. DY SDA,SCL MICOM TDA9302H EEPROM 24C08 KS88C6224 H. OSC TILT & CIRCUIT V. DRV. uPC1888CT H,V SYNC. SDA,SCL 110V,175V,24V, 13V, +/-12V,HT...
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Page 28: Information Of Part Description
INFORMATION OF PART DESCRIPTION Important Safety Notice Components identified with the International Symbol have special characteristics important for safety. When replacing any components, use only manufacturer’s specified parts. Abbreviation of Description RESISTOR Description Allowance ± 1% ± 5% ± 10% ±... -
Page 29: Electrical Parts List
ELECTRICAL PARTS LIST ! have special characteristics important for safety and x-ray radiation. The components identified by mark These should be replaced only with the types specified in the parts list. PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC B001 5PB13890-- COIL BEAD BI3890 C204 CXCH1H330J C CERA 50V CH 33PF J (TAPPING) - Page 30 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC C540 CMXF2D364J C MYLAR 200V MPP 0.36MF J (TP) C811 CCZF1H104Z C CERA 50V HIKF 0.1MF Z C541 CMXF2G154J C MYLAR MPP 400V 0.15MF J C812 CEXF1H100V C ELECTRO 50V RSS 10MF (5X11) TP C542 CMXF2G104J C MYLAR MPP 400V 0.1MF J C813 CCZF1H104Z C CERA...
- Page 31 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC D603 DZN4148--- DIODE 1N4148 AUTO 52MM L531 5MH0000075 COIL H-LINEARITY TRL-715B D605 DER206---- DIODE ER206 L801 5CPZ101K02 COIL PEAKING 100UH K (AXIAL 3.5MM) D607 DZN4148--- DIODE 1N4148 AUTO 52MM L802 5CPZ101K02 COIL PEAKING 100UH K (AXIAL 3.5MM)
- Page 32 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC Q704 TKSC5042F- TR KSC5042F R235 RD-AZ103J- R CARBON FILM 1/6 10K OHM J R001 RC-2Z105J- R CARBON COMP 1/2 1M OHM J SR37 R237 RD-AZ124J- R CARBON FILM 1/6 120K OHM J R002 RS01Z333J- R M-OXIDE FILM 1W 33K OHM J (TAPPING) R238 RD-AZ623J- R CARBON FILM 1/6 62K OHM J...
- Page 33 PART-CODE PART-NAME PART-DESC PART-CODE PART-NAME PART-DESC R542 RD-AZ103J- R CARBON FILM 1/6 10K OHM J R632 RD-4Z563J- R CARBON FILM 1/4 56K OHM J R543 RD-AZ104J- R CARBON FILM 1/6 100K OHM J R633 RD-AZ391J- R CARBON FILM 1/6 390 OHM J R544 RD-AZ183J- R CARBON FILM 1/6 18K OHM J R641 RD-AZ103J-...
- Page 34 R CARBON FILM 1/6 100 OHM J SW005 5S50101Z01 SW TACT KPT-1115VM 1C-1P R828 RD-AZ101J- R CARBON FILM 1/6 100 OHM J T001 5RM0000102 TRANS SMPS DWT-715B R829 RD-AZ106J- R CARBON FILM 1/6 10M OHM J T002 5RY0000004 TRANS SYNC DST-710C R830 RD-AZ106J-...