Medion B1997PNST Manuel de service

19-inch Color MonitorB1997PNST (MD 1998LE)Service ManualR

Product SpecificationsPage 8MD 1998LE (B1997PNST)2-4 Display Power Management Signal (DPMS)Note: These power-saving states exceed the Environmental P

Operation Theory Page 9MD 1998LE (B1997PNST)3 Operation TheoryThis is an I2C-bus fully digital controlled multi-sync color monitor, compliant with VE

Page 10 Operation TheoryMD 1998LE (B1997PNST)controllable by I2C bus. SDA and SCL signals coming from microprocessor feed to pin 19 and pin 18 tocont

Operation Theory Page 11MD 1998LE (B1997PNST)2. In protection mode or out-of-range situation, HUNLock will send 5 V pulse to saturate Q706, then pin

Page 12 Operation TheoryMD 1998LE (B1997PNST)voltage.2. RegulationThe DC O/P voltage is proportional to the auxiliary voltage, so I802 pin 2 senses t

Operation Theory Page 13MD 1998LE (B1997PNST) Horizontal dynamic focus3-6 Video Amplifier Section1. RGB signal inputs are terminated by R501, R

Page 14 Alignments and AdjustmentsMD 1998LE (B1997PNST)4 Alignments and AdjustmentsThis section of the service manual explains how to make permanent

Page 15Alignments and AdjustmentsMD 1998LE (B1997PNST)4-2 Alignment Procedures4-2-1 High Voltage AdjustmentCONDITIONDisplay image : Crosshatch patter

Page 16 Alignments and AdjustmentsMD 1998LE (B1997PNST)+8 7 6 5 4 3 210111CRTFRONTP91) Setup Bolt 2) Bow Magnet 3) Band 4) 2-Pole Magnet5) Spacer 7)

Page 17Alignments and AdjustmentsMD 1998LE (B1997PNST)Note : The 4-pole magnets and the 6-pole magnets interact, making dot movement complex.4-2-5 De

Service Manual Versions and RevisionCopyrightCopyright 2000 LiteOn Technology Corp.All Rights ReservedThis manual may not, in whole or in part, becopi

Page 18 TroubleshootingMD 1998LE (B1997PNST)5 Troubleshooting5-1 No RasterMeasureH voltage of B+at T402 onPWB-MAINNo RasterCheck voltageof cathode,he

Page 19TroubleshootingMD 1998LE (B1997PNST)5-2 Function Key AbnormalRepair powersupplyReplace X701YesCheck 5V fromI810 regulator?Power ON/OFF again a

Page 20 TroubleshootingMD 1998LE (B1997PNST)5-3 Vertical Scan (Raster is one horizontal line)Replace I301.Check pin 12 & pin13 waveform atI401Yes

Page 21TroubleshootingMD 1998LE (B1997PNST)5-4 R.G.B. Video Amplifier AbnormalCheck B+(pin17, pin36)YesCheckthe waveform at the I501pin 29, pin 32, p

Page 22 Recommended Spare Parts ListMD 1998LE (B1997PNST)6 Recommended Parts ListNote:1. The components identified by “ “ mark are critical for X

Page 23Recommended Spare Parts ListMD 1998LE (B1997PNST)No. Location Part Number Description21 Q802 6426002201 FET N-CHNL SSH 10N 80A22 I501 64420242

Page 24 Block DiagramMD 1998LE (B1997PNST)7 Block DiagramP502BLD701LEDINDICATIONS702KEYSCANI701NT6861AUI704DDCE2PROMI702I703E2PROMDEG CKTLINEFILTERBR

LITE-ON TECHNOLOGY CORP.5 F, No. 16, Sec. 4, Nanking E. Road, Taipei, TaiwanTel: 886-2-25706999 Fax: 886-2-25706888URL:// www.liteontc.com.twPrinted i

Page 1MD 1998LE (B1997PNST)Table of Contents1. Precautions...

PrecautionsPage 2MD 1998LE (B1997PNST)1 PrecautionsPlease follow these safety and servicing precautions to prevent damage and to protect against pote

PrecautionsPage 3MD 1998LE (B1997PNST)1-1-3 Product Safety NoticesMany electrical and mechanical parts in this chassis have special safety-related ch

PrecautionsPage 4MD 1998LE (B1997PNST)d) Plug monitor power cord to the Hi Pot tester terminals.e) Turn on tester and watch the indicator or beeper.f

Product SpecificationsPage 5MD 1998LE (B1997PNST)2 Product Specifications2-1 SpecificationsNote: Above specifications are subject to change without p

Product SpecificationsPage 6MD 1998LE (B1997PNST)2-2 Signal Cable Pin ConnectionsTable 2-1. Signal Cable Pin AssignmentPin Signal Pin Signal1 Red vid

Product SpecificationsPage 7MD 1998LE (B1997PNST)2-3 Timing ChartThis section describes the timings that the computer industry recognizes as standard