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Текущее время: 21 ноя 2024, 16:08
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Сообщения без ответов | Активные темы
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Assassin
[ТС]
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Заголовок сообщения: GTX1070 Founders - no Memory Voltage, with external Memory-Power all fine Добавлено: 19 авг 2020, 21:08 |
Интересующийся |
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Зарегистрирован: 14 май 2020, 20:12 Наличности на руках: 78.21
Сообщения: 61 Откуда: germany
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Hello there, i have here a GTX1070 with an error in memory power supply. i have already testet the whole card - direct connect a external Powersupply that deliver 1,5V with 20A - and card works fine with it.
i have already swap the R33 coil, the dual N Mosfet and the PWM Controller also - withaut any change in error. Controller is a default Founders memory controller, a 7J=3D (7J=xx) - with is a renamed RT8816A controller. i have already checked near all things around the controller. No shorts in any capacitor, no shorts in Mosfet gates. Measurements are: PVCCC: 5V EN: 1.8V RTon: 550 kΩ against VIN (12V) PSI: 0.8V VREF: 2.0V VRefIN: 1.52V OCSET: 77kΩ VID: 1.8V (no PWM) Bootstrap C: 97nF RGND: 0.2Ω against ground VSNS: 33Ω against Ground or 0,2Ω against VOut (memory voltage after R33 coil)
i have also dissconect the OCSET/SS pin from external SoftStart resitor/capacitor, and it will only rise to 163mV, but in datasheet it should be rise to over 2V. so i think the controller is in error state directly after start. Both gates from dual N mosfet is forcfully held low
so what can be happened here?
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Страница 1 из 1 [ Сообщений: 2 ] |
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