support device or system, or to affect its safety or effectiveness. PRODUCT STATUS DEFINITIONS. Definition of Terms. Datasheet Identification. Product Status. Fairchild Semiconductor 78R12 datasheet, 1A Fixed 12V Low Dropout Voltage Regulator (1-page), 78R12 datasheet, 78R12 pdf, 78R12 datasheet pdf, 78R 78R12 Datasheet PDF Download – LOW DROPOUT VOLTAGE REGULATOR, 78R12 data sheet.
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Electrical Parts List 3. This manual may not, in whole or in part, be copied, photocopied, reproduced, translated, or converted to datsheet electronic or machine readable form without prior written permission of Samsung Electronics Co. All other trademarks are the property of their respective owners. If a picture does not appear, fully rotate the brightness and contrast controls clockwise and reinspect. Check the following circuits.
Datashfet circuit, Horizontal output circuit. Yes Check and replace IC No 1 IC Pin 1 waveform is right? Yes Normal operation No Replace Main board. Yes IC Pin 4 voltage exists? Yes Check IC Pin 6. Check and replace IC No 2 IC Pin 1 output voltage exists?
No Refer to No Power Supply. No Check 12V line. Does Horizontal paluse signal appear at at Pin 26 of IC?
No Datasyeet and replace IC Check some parts around IC Yes Check Q, Q, T Yes Check and replace Q, Q No Check and replace Q IC Pin 12 input exists and varies with different patterns? No T Pin 8 output exists? No Check and replace T Yes IC Pin 26 output exists and varies with different patterns? No Replace failed part.
78R12 Datasheet Fairchild Semiconductor pdf data sheet FREE from
No Replace the T No Check the signal cable connection. Yes 16 IC Pin 21, 24 and 26 outputs are right? Yes 17 IC Pin 1, 2 and 3 outputs are right? No Check C, C, 78e12 Check CN Pin Yes 20 IC Pin 17 input is right? Check CN Pin 8. No Check IC Pin 41 and No Check the button. RL operation is right? Yes Check D-coil and TH No Q base input is right?
78R12 Datasheet, PDF – Alldatasheet
Yes Check and replace Q No IC Pin 4 output is right? Yes Refer to Shut down. No LED is green color? No Check power supply. Yes Scan failure Yes Check horizontal, vertical deflection system and check power supply secondary voltages. Yes Check Video board.
datwsheet No Check signal generator. No Refer to No Video. No Check IC Pins 15, 16 and Yes Is G2 voltage right? No Check D, D and Q Yes Is Heater voltage right? No Check D, Q and T Yes Is G1 voltage right? Is G2 voltage right? Yes Is blank pulse on Pin 17 of IC?
No Check Video Cable. Yes Signals at Pin 28 and 29 of IC are right?
PDF 78R12 Datasheet ( Hoja de datos )
Yes Signals at Pin 1 and 2 of IC are right? Yes Check circuits on Main board. Is the convergence now within spec? Yes Done No Readjust convergence. Yes Aging monitor and check for focus change. No Refer to Dynamic Focus Failure. Check the CRT Socket. Is 87r12 focus circuit right? Yes Replace the CRT and verify focus. Yes Done No Degaussing circuit is right?
No Refer to Degaussing Failure. Yes Replace CRT and verify purity.
C-AL ,uF, 16V Vrms 1 2 3 4 pin Table