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Автор |
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Petr Marek
[ТС]
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Заголовок сообщения: USB circuit repair on motherboard Добавлено: 04 фев 2021, 00:43 |
Я тут случайно |
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Зарегистрирован: 02 фев 2021, 09:39 Наличности на руках: 0.00
Сообщения: 0 Откуда: Praha
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Hi, I have a motherboard on which there are two outputs for the front USB (USB1, USB2) and one of them is broken (USB1). According to the multimeter, I found that the voltage and ground pins are OK. Data pin 6 has a significantly lower voltage drop across other components. The other pins have the same loss as the USB 2 connector, however, any USB outputs on the USB1 connector doesnt work, so there will probably be more errors in the USB1 circuit. What does this finding suggest?
Последний раз редактировалось Petr Marek 04 фев 2021, 01:23, всего редактировалось 1 раз.
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mia
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Заголовок сообщения: Re: USB circuit repair on motherboard Добавлено: 05 фев 2021, 09:45 |
Продвинутый форумчанин |
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Зарегистрирован: 14 сен 2018, 18:14 Наличности на руках: 1,279.27
Сообщения: 2530 Откуда: Odesa,Ukraine
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Maybe. Observe visually, check with a multimeter the tracks of the printed circuit board and the connected components (resistors, capacitors, etc.) from the connector pins to the ic's. But keep in mind that always, especially modern USB devices, you need to connect to the rear connectors for stable operation at high speeds. Patch cables from the front motherboard connectors to the front connectors on the case increase overall length, which negatively affects connection stability and speed.
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mia
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Заголовок сообщения: Re: USB circuit repair on motherboard Добавлено: 27 фев 2021, 00:29 |
Продвинутый форумчанин |
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Зарегистрирован: 14 сен 2018, 18:14 Наличности на руках: 1,279.27
Сообщения: 2530 Откуда: Odesa,Ukraine
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Petr Marek писал(а): The second pin from the bottom of the left side of the RN 32 is the affected one with different value. Determine where it is connected. On this forum, you need to indicate the model of the device with the marking. Perhaps there is a schematic diagram on the Internet.
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mia
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Заголовок сообщения: Re: USB circuit repair on motherboard Добавлено: 03 мар 2021, 09:13 |
Продвинутый форумчанин |
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Зарегистрирован: 14 сен 2018, 18:14 Наличности на руках: 1,279.27
Сообщения: 2530 Откуда: Odesa,Ukraine
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Some motherboards have protective components on the data line, such as overcurrent fuses and/or overvoltage suppressors. If they are on your board and if they have fulfilled their purpose, they can affect the measurement results. There are enough working ports on the board, except for one. If there are no other complaints about the board, accept the loss of one port. To test the resistor assemblies RN, their problem leads must be disconnected from the rest of the circuit. This can be done, for example, by cutting the printed track, and then repairing it with a piece of wire by soldering.
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Страница 1 из 1 [ Сообщений: 22 ] |
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Вы не можете начинать темы Вы не можете отвечать на сообщения Вы не можете редактировать свои сообщения Вы не можете удалять свои сообщения Вы не можете добавлять вложения
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