SERVICE MANUAL TOSHIBA LCD-AD194TW THESE DOCUMENTS REPAIR SERVICE INFORMATION ONLY.EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES, ERRORS OR OMISSIONS.
Monitor Block Diagram Flat Panel and CCFL Drive. CCFL backlight Main Board Power board RS232 Connector (Include: adapter, inverter) For white balance adjustment in factory mode Keyboard AC IN HOST Computer Video signal, DDC 100~240V AD194TW TOSHIBA Page 5 of 62...
Press the power button to turn on the monitor, the power indicator will light up. 3.2 CONTROL BUTTONS 3.2.1 KEY CONTROL Power On/Off Auto Adjustment OSD Menu for Clock, Phase and H.V. Position Volume +, - & Menu Select 3.3 ADJUSTING THE PICTURE AD194TW TOSHIBA Page 6 of 62...
4.1 INPUT SIGNAL CONNECTOR PIN NO. DESCRIPTION PI N NO. DESCRIPTION Red Video Green Video Detect Cable Blue Video RS232 RS232 DDC-Serial Data DDC-Return H-Sync R-Ground V-Sync G-Ground DDC-Serial Clock B-Ground D-SUB 15 PIN CONNECTOR AD194TW TOSHIBA Page 7 of 62...
< 60A peak at 264 VAC and cold starting Leakage Current < 3.5mA No advance effects (no loss of information or defect) Power line surge with a maximum of 1 half-wave missing per second AD194TW TOSHIBA Page 9 of 62...
ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK Input voltage 10.8 13.2 Input current FOR 4 LOAD Output Current Iout FOR 1 LOAD Frequency FOR 1 LOAD Start voltage 1430 Vrms RL=CCFL Protect delay time AD194TW TOSHIBA Page 10 of 62...
Input signal 2-ch LVDS System 3.05 Power consumption(W) Optimum viewing direction 6 o’clock Contrast ratio 550:1(typ.) Viewing angle 150(H) x 135(V) Response time 8ms(typ.) Luminance 250cd/ m² Power supply voltage LCD panel signal processing board:5V AD194TW TOSHIBA Page 11 of 62...
7、 Disassemble connect pins of the main board to panel, showed in Fig.15,16. 8、 Remove the bezel, showed in Fig.17. Do not scratch the panel. 9、 Disassemble the screws that fix the panel, showed in Fig.18,19. 10、That’all, the process is over. 5.2.3 Pictures: Cushion (Fig.1) (Fig.2) AD194TW TOSHIBA Page 15 of 62...
5.3 SOFTWARE FLOW CHART AD194TW TOSHIBA Page 19 of 62...
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16) Display "No connection Check Signal Cable" message. And go into standby mode after the message disappear. 17) Program the scalar to be able to show the coming mode. 18) Process the OSD display. 19) Read the keyboard. Is the power key pressed ? AD194TW TOSHIBA Page 20 of 62...
Replace Power board and Check Replace U401 (TSUM57AK) Inverter control relative circuit Re-do White balance adjust Note:1. If replace “MAIN-BOARD” , Please re-do “DDC-content” programmed & “WHITE-Balance”. 2. If replace “Power Board” only, Please re-do “ WHITE-Balance” AD194TW TOSHIBA Page 37 of 62...
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If Bklt-On no-response when the power switch Pin10 PWM signal control dim 0V-5V turn on-off, Replace U401 TUSM57AK Replace power board to new-one and check Replace Power board the screen is normal? & Re-do white balance AD194TW TOSHIBA Page 38 of 62...
OSD is unstable or not working Connect Key Pad Board Is Key Pad Board connecting normally ? Replace Button Switch Is Button Switch normally ? Replace Key Pad Board Is Key Pad Board normally ? Check Main Board AD194TW TOSHIBA Page 39 of 62...
Repeating the start voltage Check the auxiliary voltage is bigger than 10V smaller than 20V 1) Check IC901 2) Check ZD901, Q902, Q903…OVP circuit Check IC901 pin8 PWM wave Check IC 901 Check Q903,R919, T901,D910,D912,ZD904 AD194TW TOSHIBA Page 40 of 62...
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Check the pin19/20 of U201 have saw tooth wave Check ZD201/ZD202 Check the resonant wave of pin2 & pin5 for PT201 Check Q204/Q208 Check the output of PT201 Change PT201 Check connecter & lamp AD194TW TOSHIBA Page 41 of 62...
6、Adjust the BLUE of 9300K on factory window until chroma 7120 indicator reached the value B=100 7、Repeat above procedure ( item 4,5,6) until chroma 7120 RGB value meet the tolerance =100±2 B、Adjust 7200K color-temperature 1、Switch the Chroma-7120 to RGB-Mode (with press “MODE” button ) AD194TW TOSHIBA Page 42 of 62...
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6、Adjust the BLUE of SRGB on factory window until chroma 7120 indicator reached the value B=100 7、Repeat above procedure ( item 4,5,6) until chroma 7120 RGB value meet the tolerance =100±2 E、Press reset key and Turn the Power-button “off to on” to quit from factory mode. AD194TW TOSHIBA Page 43 of 62...
PE BAG FOR MANUAL 45G 88606 TS PE BAG FOR BASE 45G 88626 TS PE BAG FOR MONITOR 50G 600 2 HANDLE1 50G 600 3 HANDLE2 1186 SMALL TAPE 1211 A 铝箔胶带 1901 A 铝箔胶带 AD194TW TOSHIBA Page 45 of 62...