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| Lenovo Thinkpad L530 (Intel) No Power https://vlab.su/viewtopic.php?f=58&t=99331 |
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| cygron [ 06 фев 2020, 07:04 ] | |
| Заголовок сообщения: | Lenovo Thinkpad L530 (Intel) No Power |
Lenovo Thinkpad L530 No Power Problem. Connect with adapter and adapter light goes out. 19V line is short. I do not have schematic of this model. So i remove PR4002 Resistor (Fig-1) and connect with DC Power Supply to find short (hot component). Found shorted Capacitor near CPU and Replace with good one. But when i connect with adapter, it short again. Found Other capacitor near CPU short again. So i check Capacitor (Near CPU) with Multimeter and found 19V. When i connect Adapter (or) Power Supply, 19v is also here in CPU Supply Volt line (Fig-2). I think CPU Supply Volt may be 1V or nearly. But in this laptop 19v is there in CPU Supply Volt Line. I don't know Why? Please help me to find this kind of short. Fig-1 https://drive.google.com/open?id=16UWvg ... TPJ1DD28pR Fig-2 https://drive.google.com/open?id=12eOWh ... RTBV9gHiyf Lenovo Thinkpad L530 (A) https://drive.google.com/open?id=13hkrq ... VDW56yoiEJ Lenovo Thinkpad L530 (B) https://drive.google.com/open?id=18Q1-l ... 1uGeYUqjzl |
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| jocker [ 06 фев 2020, 08:07 ] | |
| Заголовок сообщения: | Re: Lenovo Thinkpad L530 (Intel) No Power |
check upper mosfet`s in cpu power (pu4301 pu4303 ?). |
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| cygron [ 07 фев 2020, 19:50 ] | |
| Заголовок сообщения: | Re: Lenovo Thinkpad L530 (Intel) No Power |
First of all, thanks for your help. I found bad mosfet (PU4301). But i do not have this type of mosfet. So i tried to replace with some N-Channel mosfet by wire connection. Now laptop is power on but no display. CPU Core voltage is ok (about 1.1V). But a few minutes run replaced mosfet is so hot and wire connection is loose. Any short remain on motherboard? Or need to replace same type of mosfet. https://drive.google.com/open?id=1-j0dT ... a7vN8yiSxY https://drive.google.com/open?id=1OemCV ... _DJgwvT1AB |
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