Assessments - 1, GPA: 4
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Abnormal Picture 9-1. Horizontal Size When the VR601 is changed, is the H.size changed? No Yes Check pin 15 of IC501 and its ambient circuit (D604, R605, R606, R607) It isn't out of order. Is the H.Size about 295mm at VGA mode and Min. H.Size in OSD Menu? No Yes 1.Check B+ section of TDA9109 and its ambient circuit. 2.Check Q601 and its ambient circuit. Abnormal H.Size 25 9-2. Vertical Size Is changeable the DC voltage of IC401 pin 1? Check the IC401 and its ambient circuit Check the IC501 and its ambient circuit No No Trouble V.OSC/ Deflection Circuit Refer to V.OSC/Deflection circuit Yes Is the 3.5Vdc of pin 23 of the IC501? Yes Abnormal V.Size 26 10. High Voltage Circuit Trouble in Q574 or FBT Is Q574 base waveform normal? Yes Yes Trouble in Q572, Q573 12V Line Is Q571 collector waveform normal? Yes No Trouble in Q571 Is Q501 emitter waveform normal? Yes No Trouble in Q501, Q502 Is IC501 pin 26 waveform normal? Yes No Trouble in power supply Is IC501 pin 29 voltage about 12V? No No Trouble in IC501 ambient circuit. Is the input H.Sync correct? Yes Yes No Trouble in H.V circuit (No Raster) Trouble in H.Sync Trouble in power supply circuit Is B+(45V) line voltage normal? No 27 11. Side-Pincushion Circuit Side-Pincusion distortion is excessive or barrel O.K Select the side-pincushion icon on OSD menu, and adjust acceptable position. Yes Check IC501 or their ambient circuit (pin 14, 15, 16) Is the pin 24 waveform of IC501 correct Yes No Check IC501 or it's ambient circuit. Trouble in H.V Sync Is the waveform of IC501 pin 1, 2 Yes No No 28 12. Power Supply Unit (P.S.U) Is the voltage of IC001 pin 3 16V? Replace R004 Replace C005 No Is voltage of C101 80V DC? Trouble in D101 or Video Part No Is voltage of C113 120V DC? Trouble in D108 or Video Part No Is voltage of T001 pin 6 130V (370V)? Trouble in D001, D002, D003, D004, C004 and TH001. No Is the waveform of IC001 pin 1correct? 400Vpp (620Vpp) Trouble in T001, IC001, IC101, PH001 and D005 etc. No Trouble in P.S.U Is power switch on? Switch on No Yes Yes Yes Yes Yes Yes Yes Is voltage of C103 45V DC? Trouble in D102, D103 or B+ Part No Is fuse F001 O.K? Check the power cord outlet and diode D001, D002, D003, D004 No A 29 Is voltage of C106 8.7V DC? Trouble in D106 or Q103 No Is voltage of C104 13V DC? No Yes Yes Yes Is voltage of C105 -13V DC? Trouble in D105 or vertical Part. P.S.U O.K Trouble in D104, IC102 or horizontal Part. No A 30 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 75 terminal positive polarity Synchronizing : TTL level Negative/Positive Separate/Composite Deflection frequency Horizontal Frequency : 30KHz - 69KHz Vertical Frequency : 50Hz - 160Hz Pre-Adjustment 1. High voltage Adjustment Adjust 26 kvdc between Anode cap and ground at a cross hatch pattern of 31.5KHz by using VR551. 2. B+ Adjustment (H.min size) (a) Receive a cross hatch pattern of 31.5KHz (b) Set the H-Size control to the minimum. (c) Adjust H-Size to 295mm by using VR601 Main Adjustment 1. Setting the Controls Set the value of items as following. Contrast : Max. (OSD value up to 100) Brightness : Center (Set the OSD value to 50) 2. H.size, V.size, H.phase, V.position, Pincushion, Trapezoid Perceive the cross hatch pattern of Factory preset mode. H.Size, V.size, H.phase, V.position, Pincushion, Trapezoid are adjusted at each mode. In Factory, Auto Alignment was done at each mode. Therefore, Factory preset mode has it’s own value according to each control. 3. Focus (a) Set brightness control to center and contrast control to MAX. (b) Receive all “H” character pattern of 60KHz mode signal. (c) Adjust the Focus control of FBT to obtain best Focus (static focus and Dynamic focus). 4. Geometric Distortion Adjustment. (a) Receive the cross hatch pattern of VGA mode signal by using the signal generator. (b) Pin balance, Parallelogram are adjusted the best geometric status. (c) Repeat the adjustment at each mode. 5. White Balance Adjustment (a) Receive a full white pattern of 60KHz mode. (b) Select 9300°K on the OSD Menu. (c) Set the bright control and contrast control to the maximum and receive the all black pattern. (d) Adjust the FBT screen VR to get the screen luminosity to 1 Ft/L. (e) Select the R, G, B Bias on the OSD menu and adjust the ADJUST +/– key to get the color coordinates in X=0.281, Y=0.311 (f) If the screen luminosity is changed adjust the sub brightness control to get the 1 Ft/L screen luminosity. (g) Set the brightness control to the center and contrast control to the maximum. (h) Receive a full white pattern. (i) Select the R, G, B gain on the OSD menu and adjust the ADJUST +/– key to get the color coordinates in X=0.281±0.03, Y=0.311±0.03 (j) Adjust the sub contrast control to get the screen luminosity to 34 Ft/L/ (k) Select 6550°K on the OSD menu and set the bright control and contrast control to the maximum and receive ...