Dell D825TM Service Manual

D-1 chassis color monitor
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SERVICE MANUAL

Picture tube
0.25 mm aperture grill pitch
15 inches measured diagonally
90-degree deflection
Video image area
(14" maximum viewing image)
Approx. 286.5 x 214 mm (w/h)
3/8
(11
x 8
Logical resolution
Horizontal: Max. 1280 dots
Vertical: Max. 1024 lines
Physical resolution
Horizontal: Max. 1024 dots
Vertical: Max. 768 lines
Standard image area
Approx. 270 x 202 mm (w/h)
(10
3/4
x 8 inches)
Input signal
Video
Analog RGB (75 ohms typical)
0.7 Vp-p, Positive
Sync
External HD/VD, Composite
Polarity Free TTL
Video Composite (Sync on Green)
0.3 Vp-p, Negative
SPECIFICATIONS
Power Consumption
Deflection frequency
1/2
inches)
AC input voltage / current
Dimensions
Mass
Design and specifications are subject to change without notice.
— 1 —
D825TM
N. Hemisphere Model
Equator Model
Chassis No. SCC-L06C-A
D-1
Maximum
110W
Nominal
80W, 273 BTU/h
Horizontal: 30 to 70 KHz
Vertical: 50 to120 Hz
100 to 120 V, 50/60 Hz, 1.8 A
220 to 240V, 50/60Hz, 1A
368 x 392 x 384.5 mm (w/h/d)
(14
1/2
x 15
Approx. 14.0 kg (30 lb 14 oz)

COLOR MONITOR

D825TM
D825TM
CHASSIS
1/2
x 15
1/4
inches)
R

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Summary of Contents for Dell D825TM

  • Page 1: Service Manual

    D825TM D825TM SERVICE MANUAL D825TM N. Hemisphere Model Equator Model Chassis No. SCC-L06C-A CHASSIS SPECIFICATIONS Power Consumption Picture tube 0.25 mm aperture grill pitch Maximum 15 inches measured diagonally 110W Nominal 90-degree deflection 80W, 273 BTU/h Deflection frequency Video image area (14"...
  • Page 2 D825TM POWER SAVING FUNCTION NOTE: If no video signal is input to the monitor, the This monitor has three Power Saving modes. "NO INPUT SIGNAL" message appears. After By sensing the absence of a video signal from the about 30 seconds, the Power Saving function...
  • Page 3 D825TM SAFETY CHECK-OUT (US Model only) After correcting the original service problem, perform LEAKAGE TEST the following safety checks before releasing the set to the The AC leakage from any exposed metal part to earth ground customer: and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microampere).
  • Page 4: Table Of Contents

    D825TM TABLE OF CONTENTS Section Title Page 1. GENERAL ................... 5 2. DISASSEMBLY 2-1. Cabinet Removal ............10 2-2. Service Position .............. 10 2-3. D,A and D1 Board Removal.......... 10 2-4. Picture Tube Removal ........... 11 3. SAFETY RELATED ADJUSTMENT ......... 12 4.
  • Page 5: General

    Warning Messages ..............12 Parts and Controls ..............5 Troubleshooting ..............12 The OSD (On-screen Display) System ......... 6 Dell Computer Corporation’s Environmental Program . 14 Resetting the Adjustments ............. 9 Appendix ................109 Precautions 6 u (POWER) switch and indicator (page 11) (RESET) button (pages 6 and 9) Resets the adjustments to the factory settings.
  • Page 6 Customizing Your Monitor Getting Started Customizing Your Monitor 3 Using the SCREEN OSD Adjusting the Settings Adjusting the Picture Brightness and Contrast You can adjust the convergence of the picture and cancel the 1 Using the COLOR OSD picture’s moire using the SCREEN OSD. Convergence is the alignment of the Red, Green and Blue Press the ¨...
  • Page 7 Customizing Your Monitor Getting Started Customizing Your Monitor 4 Using the ZOOM OSD 6 Using the SIZE OSD 8 Using the GEOMETRY OSD Resetting the Adjustments You can enlarge or reduce the picture size using the ZOOM You can adjust the picture size using the SIZE OSD. You can adjust the picture’s geometry using the GEOMETRY OSD.
  • Page 8: Warning Messages

    Customizing Your Monitor Additional Information Graphic Enhancement Mode Warning Messages (GEM) If there is something wrong with the input signal, one of the following messages appears. The input signal condition You can automatically change the characteristics of the picture to match the way you use your monitor with the Graphic INFORMATION “OUT OF SCAN RANGE”...
  • Page 9 Getting Started Additional Information Symptom Check these items You cannot adjust the monitor • If the Control Lock function is set to “ON,” set it to “OFF” using the OPTION OSD (page 8). with the buttons on the front panel Screen image is not centered or •...
  • Page 10: Disassembly

    D825TM SECTION 2 DISASSEMBLY 2-1. CABINET REMOVAL 2-2. SERVICE POSITION Two claws PUSH Cabinet PUSH A board D board Two screws (BVTP 4 x 16) 2-3. D, A and D1 BOARD REMOVAL A board Five screws (BVTP 3 x 12)
  • Page 11: Picture Tube Removal

    D825TM 2-4. PICTURE TUBE REMOVAL Demagnetization coil Two screws (BVTP 4 x 16) Tension spring A board Neck assy Deflection yoke Two degaussing coil holders Picture tube Four screws (Tapping screw 5) Stand assy (D board) Anode cap Two degaussing...
  • Page 12: Safety Related Adjustment

    D825TM SECTION 3 SAFETY RELATED ADJUSTMENT When replacing parts shown in the table below, the b) HV Hold-Down Check following operational checks must be performed as a 1) Using an external DC Power supply, apply the safety precaution against X-ray emissions from the unit.
  • Page 13: Adjustments

    D825TM SECTION 4 ADJUSTMENTS Connect the communication cable of the connector located on the D board on the monitor. Run the service software and then follow the instructions. 1-690-391-21 A-1500-819-A 3-702-691-01 Interface Unit Connector Attachment IBM AT Computer To BUS CONNECTOR...
  • Page 14 D825TM Receive White cross-hatch. Convergence Specification Adjust HMC and VMC at six-pole magnet. < 6 Pole Magnet> Horizontal and Vertical 0.30mm 0.24mm 0.30mm 0.30mm Focus adjustment Receive R.B. cross-hatch. Adjust focus (V) and focus (H) for optimum focus. Adjust H.TILT by swinging the DY neck right and left.
  • Page 15: Circuit Boards Location

    D825TM 5-2. CIRCUIT BOARDS LOCATION J D1 5-3. SCHEMATIC DIAGRAMS AND PRINTED WIRING BOARDS Note: • All capacitors are in µF unless otherwise noted. pF: µµF • When replacing parts shown in the table below, 50 WV or less are not indicated except for electrolytic.
  • Page 16 C N 3 0 5 + 5 V S T B Y + 5 V C N 3 0 7 G N D W H T R - O U T R - O U T + 1 2 V + 1 2 V R G B P R E - A M P...
  • Page 17 (VIDEO) J001 IC002 IC001 LM2405 CXA2055P CRT DRIVER PRE-AMP CN307 D301 :S-MICRO C301 1SS226 C_SYNC CONNECTOR STBY+5V R301 FL301 R304 CN301 C055 15PIN D-SUB BGND R204 :RN-CP B:CHIP :CHIP 250V SG001 C104 BLUE R_BKG S/H_R C015 1.2KV :CHIP C035 D201 R104 IC006 C201...
  • Page 18 0.7 Vp-p(H) 0.7 Vp-p(H) 0.7 Vp-p(H) 4.3 Vp-p(H) 4.5 Vp-p(H) 4.4 Vp-p(H) 45.0 Vpk-pk 45.0 Vp-p(H) 45.0 Vp-p(H)
  • Page 19 V-DF AMP :CHIP 250V 250V 2SA1175 BUFF Q604 C516 C525 C643 DTC114ESA R501 C523 0.0047 0.56 0.33 0.12 CN512 STBY CONTROL B-SV3405<D1-DELL>-D.. 250V 200V 250V 250V C605 C530 D649 0.36 S601 R503 250V 1SS133T 250V 6.8k R512 Q512 Q515 C642...
  • Page 20 5.3 Vp-p(H) 3.8 Vp-p(24MHZ) 5.1 Vp-p(V) 1.14 KVp-p(H) 5.3 Vp-p(H) 58.1 Vp-p(H) 1.3 Vp-p(H) 51.9 Vpk-pk 12.3 Vp-p(H) 10.9 Vp-p(H) 8.8 Vp-p(H) 11.6 Vp-p(H) 8.7 Vp-p(H) 0.9 Vp-p(V) 3.5-4.0 Vp-p(H)
  • Page 21: Exploded Views

    D825TM SECTION 6 EXPLODED VIEWS Note: • • Items with no part number and no descrip- Items marked " " are not stocked tion are not stocked because they are sel- since they are seldom required for routine The components identified by shading dom required for routine service.
  • Page 22: Packing Materials

    D825TM 6-2. PACKING MATERIALS REF.NO. PART NO. DESCRIPTION REMARK REF.NO. PART NO. DESCRIPTION REMARK REF.NO. PART NO. DESCRIPTION REMARK 3-861-616-21 MANUAL, INSTRUCTION 52 * 4-062-856-01 CUSHION (UPPER) 54 * 4-041-927-11 BAG, POLYETHYLENE 55 * 4-062-857-01 CUSHION (LOWER) 56 * 4-062-858-01 INDIVIDUAL CARTON...
  • Page 23 5-4. SEMICONDUCTORS EGP10D UF3ML-6505 RB441QT-77 EGP20GPKG23 UF4007G23 EGP30D TDA6103Q SB340L-6489 5TUZ52 SPB-26 CATHODE RD4.7ES ELIZ RGP02-20EL-6394 2SA1162-G CATHODE RD5.1ES CATHODE ERB91-02 3DL41A (LC6-15) CATHODE RD5.6ES-B2 GP08D HSS 82 RD8.2ES-B2 MUR160 RD10ES-B2 RGP02-17EL RD12ES-B2 RD18ES-BS RD27ES-B2 1SS119-25TD ANODE (GRN) ANODE CATHODE ANODE ANODE ANODE...
  • Page 24: Electrical Parts List

    D825TM SECTION 7 ELECTRICAL PARTS LIST The components identified by [ in this manual RESISTORS Note: have been carefully factory-selected for each • All resistors are in ohms set in order to satisfy regulations regarding X- REF.NO. PART NO. The components identified by shading...
  • Page 25 D825TM Note: Note: The components identified by shading Les composants identifies per un trame and mark ¡ ¡ ¡ ¡ ¡ et une marque ¡ ¡ ¡ ¡ ¡ sont critiques pour la are critical for safety. Replace only with part number specified.
  • Page 26 D825TM Note: Note: The components identified by shading Les composants identifies per un trame et une marque and mark ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ sont critiques pour la securite. Ne les remplacer are critical for safety.
  • Page 27 D825TM Note: Note: The components identified by shading Les composants identifies per un trame et une marque and mark ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ sont critiques pour la securite. Ne les remplacer are critical for safety.
  • Page 28 D825TM Note: Note: The components identified by shading Les composants identifies per un trame et une marque and mark ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ sont critiques pour la securite. Ne les remplacer are critical for safety.
  • Page 29 D825TM Note: Note: The components identified by shading Les composants identifies per un trame et une marque and mark ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ sont critiques pour la securite. Ne les remplacer are critical for safety.
  • Page 30 D825TM Note: Note: The components identified by shading Les composants identifies per un trame et une marque and mark ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ sont critiques pour la securite. Ne les remplacer are critical for safety.
  • Page 31 D825TM Note: Note: The components identified by shading Les composants identifies per un trame et une marque and mark ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ sont critiques pour la securite. Ne les remplacer are critical for safety.
  • Page 32 D825TM Note: Note: The components identified by shading Les composants identifies per un trame et une marque and mark ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ sont critiques pour la securite. Ne les remplacer are critical for safety.
  • Page 33 D825TM The components identified by [ [ [ [ [ in this manual have been Note: The components identified by shading carefully factory-selected for each set in order to satisfy and mark ¡ ¡ ¡ ¡ ¡ are critical for safety.

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