Training Manual

1 Training ManualCourse: CRT-01 CRTT roubleshootingDiagnostics and TroubleshootingRecommended Troubleshooting & Repairing Guide: LED & LCD TV Repair Tips ebook More information on T-con Board & Mainboard Secret Repair Tips! LCD TV Repair Tips & Case Histories Collection of LCD TV Repair Tips Vol-3 LCD/LED Monitor Repair Case Histories by Jestine Yong LCD/LED & 3D TV Repair Membership Site Plasma & 3D TV Repair Membership Site Projection TV & DLP/LCD Projector Repair Membership Site Troubleshooting & Repairing LCD TV Guide Plasma TV Repair Guide- Display Fault Troubleshooting Basic LCD TV Repair Secrets Revealed LCD Monitor

2 Repair Guide Vol .1- 10 Trus Repair Case Histories of LCD Monitor SMPS-Switch Mode Power Supply Repair Guide Testing Electronic Components like a Pro- For Beginner Please visit: Table of Contents1. Inside the Repair Analysis CRT Related (black, white, burn, dust); color mixing;shadows; line - popping noise fro the CRT gun; rasternoise; intermittent focus; intermittentbrightness picture; sound is present; heater filamentsare color in convergence; color screen is out of with retrace lines (normal or lowbrightness), no or no picture; sound is present, limitedbrightness level contamination or incorrect colors, typicallyat the picture, no sound, HV will not turn DEAD Unit Troubleshooting (DEADor PIXX).

3 7 CRT No Picture or Dark PictureTroubleshooting (NPIX or PIXS)..9 Poor Emission, , Hot Arcing, No Color, IntermittentPicture, Jiter, Raster Only or RetraceLines (ARCS, PIXC, PIXI, PICJ,PIXL)..11 PIXL, PIXI, PIXK PICC OR ARCS - Damage Caused by Convergence / Beam LandingTroubleshooting (PIXD, PIXW).. Convergence / Beam CRT Convergence Geometric Distortion(PIXD, PIXW).. Geometric Focus Troubleshooting (PIXF).. CRT Convergence Axis Axis AX-1 Chasis PCB Interconnections and Functional DescriptionsChapter 1 - Inside the CRTFIGURE 1-1 - EXPLODED VIEWSOCKET BASEAPERTURE GRILLELECTRON GUNPHOSPHOR &CARBON STRIPES12/5 1-2 - TOP VIEW OF ELECTRON Repair Analysis FlowchartChapter 2 - Repair Analysis FlowchartRepair damagedpart of this point.

4 Check for for visibledamaged partsor looseconnectionsOK= Set returned to CustomerYesNoNGNGAge unitFIGURE 2-1 - ANALYSIS FLOWCHART12/3 sent to tocheck the reportedfaultCheck forphysicaldamageIt is likely to havecaused theproblemTest TVRepair usingservice bulletinAge set &monitorYesNoNGOKNoYesOKNoCheck forservicebulletinsAge unitNoRepair DamageYesGo to next pageTurn set ON toobserve fault ortest Repair Analysis FlowchartFIGURE 2-2 - ANALYSIS FLOW (CONTINUED)12/3 voltagesBoard connectionsFuses*Refer to informationsheetDEADNo PictureNo Sound(PIXX)EIA CodeNo PictureDark Raster(NPIX, PIXS)EIA CodeWill set turn on?Step 1Is bright Rastervisible?

5 Step 2 CHECKH eatersBoard voltagesBoard connections*Refer to informationsheetNoCHECKB oard voltagesBoard connectionsGround connections*Refer to informationsheetPicture Condition: Noisy Intermittently turns off Black & white only No videoStep 3 Raster onlyIntermittent pictureJitter - JumpingNo colorArcingEIA CodeYesYesCHECKF ocusLandingConvergenceGeometry*Refer to informationsheetCHECKS pots, scatchesColor spotsShadows, lines, etc.*Refer to informationsheetIs picture qualitypoor?Step 4 YesNoIs there a flaw onoutside surface ofinside of the screen?Step 5 CRT blemish,Physicaldamage(APPR)(DAMG)EIA CodePicture distortedPicture noisyOut of focusPoor colorWrong color(PIXD) (PIXF)(PIXW)EIA CodeNo43.

6 CRT Related SymptomsChapter 3 - CRT Related SymptomsSpots (black, white, burn, dust); color mixing; shadows; line kinksCause:Flaw on or behind phosphor affecting the overall appearance of the Code: APPREIA Description: Appearance defectCTV Description: Visual defectArcing - popping noise from the CRT gun; raster noise; intermittent focus;intermittent brightness changesCause:Current leak, stray electrons. Particles in the electron gun cause intermittent current leakage Code: ARCS; PIXI; PIXJEIA Description: Arcing; Intermittent picture; Jittery/unstable pictureCTV Description: Arcing; ShortNo picture; sound is present, heater filaments are ONCause:Cathode emission; short; low vacuum.

7 The cathode emission may be weak; grids may be shorted; may beintermittent or Code: NPIXEIA Description: No pictureCTV Description: White balance, shortNo color in pictureCause:CRT short at cathode or grids causing a defect in B board (video drive).EIA Code: PIXCEIA Description: No color in pictureCTV Description: Short53. CRT Related SymptomsPoor convergence; color distortionCause:CRT gun is not perpendicular to the CRT face - physical damage; internal IBR resistor is damaged. Colordistortion may consist of colored shadows in the Code: PIXDEIA Description: Picture distorted/noisyCTV Description: ConvergenceGeometric distortionCause:CRT gun is not perpendicular to the CRT face - physical damage; internal IBR resistor is Code: PIXDEIA Description: Picture distorted/noisyCTV Description: GeometricEntire screen is out of focusCause:Leak current between G-3 and G-4.

8 This may be constant or Code: PIXFEIA Description: Picture out of focusCTV Description: FocusRaster with retrace lines (normal or low brightness), no videoCause:Short between grids (typically G1 and G2). G2 drive circuit may become Code: PIXLEIA Description: Raster is present, but no pictureCTV Description: ShortDark or no picture, sound is present, limited brightness level adjustmentCause:Poor emission due to shorted grids or vacuum leak. Sound is present, but the picture is weak or cannot Code: PIXSEIA Description: Dark pictureCTV Description: White balance63. CRT Related SymptomsColor contamination or incorrect colors, typically at the :Purity beam landing; DY ring magnets; CRT magnets; degauss defectiveEIA Code: PIXWEIA Description: Poor or incorrect colorCTV Description: LandingSymptom/Cause: Mislanding, purity shiftNo picture, no sound.

9 HV will not turn :Vacuum leak; broken neck; frit leak; open filament heaters. Main fuse may be Code: PIXX, DEADEIA Description: No picture, no soundCTV Description: Broken CRT, open heaters74. DEAD Unit Troubleshooting (DEAD or PIXX)Chapter 4 - DEAD Unit Troubleshooting (DEAD or PIXX)CRT CausesNo HeatersTurn the power ON and visually check the 4-1 FIGURE 4-2 Broken CRTLook for damage to the neck of body of the 4-3 - BROKEN CRT84. DEAD Unit Troubleshooting (DEAD or PIXX)Table 4-1 DEAD Unit (DEAD, PIXX) Possible causes other than the CRT Symptom CHECK ITEMS COUNTER MEASURE Power cord plugged in / Power on ? Plug in / Turn power on Fuse Change fuse Anode cap position Connect anode cap securely if off Check G2 level If too high (2 flash OCP), lower H-out may be defective.

10 If too low (5 flash AKB) will occur. Adjust for correct level. Check B+ voltage Check for short circuit to GND. AE-5A may be low H-out (2 flash OCP). Power IC problem. The fuse may be broken replace fuse. Check FBT soldering connection Re-solder bad connection. Check for crack board near FBT Replace board Check M board connection Secure M board, insert correctly. Check service bulletin information Implement fix as per bulletin. No Picture / No Power Check DY connection Check if DY connector is inserted into the board correctly. 95. No Picture or Dark Picture Troubleshooting (NPIX or PIXS)Chapter 5 - No Picture or Dark PictureTroubleshooting (NPIX or PIXS)Poor Emission, VacuumAdjust the Cathode drive and G-2 level and check for brightness , Hot ShortWith CRT socket off, check each CRT pin for a short with another pin.