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#41 |
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![]() Where should the voltage come from on the 5th leg A6069H?
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#42 |
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![]() looks like it comes from c7901.
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#43 |
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#44 |
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![]() I see, ok check c7906, r7909, r7919, d7904.
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#45 |
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![]() make sure the resistors are the correct value and not open.
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#46 |
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#47 |
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![]() Use data sheet. Pin 7,8 are the startup voltage
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#48 |
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#49 |
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#50 |
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#51 | |
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![]() Quote:
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#52 |
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![]() 9.1 Startup Operation
Figure 9-1 shows the circuit around IC. Figure 9-2 shows the start up operation. The IC incorporates the startup circuit. The circuit is connected to D/ST pin. When D/ST pin voltage reaches to Startup Circuit Operation Voltage VST(ON) = 38 V, the startup circuit starts operation. During the startup process, the constant current, ISTARTUP = − 2.5 mA, charges C2 at VCC pin. When VCC pin voltage increases to VCC(ON) = 15.3 V, the control circuit starts operation |
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#53 | |
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#54 |
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![]() CAP c2 (C7907) i change but nothing changed
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#55 |
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![]() Check pin 5 diode, resistor and cap.
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#56 |
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#57 |
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![]() If all components off of pin5 are good. May have bad ic.
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#58 |
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![]() What is the voltage on pin 4 of ic7903, this is the FB (feedback) voltage.
Is R7907 ok? IC7801 will not effect ic7903. IC7801 is the pfc driver ic. and is not active in standby Last edited by R_J; 05-19-2022 at 11:38 AM.. |
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#60 |
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