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| VPCEH (MBX-247) 1.5V is completely short https://vlab.su/viewtopic.php?f=55&t=19046 |
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| P.zonouz [ 10 фев 2014, 16:01 ] | |
| Заголовок сообщения: | VPCEH (MBX-247) 1.5V is completely short |
Hi. There is a MBX-247. It turns on then off again. I found the there is short circuit on 1.5V. I tossed 1.5V from PQ24 ( pin 1,2,3) but there is very short. (0.6ohm). Voltage drops and I used high Amperes Lab PS(10A) but again nothing going Hot. It is like Connect + & - probes directly. It is very strange. any advice to find the problem? |
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| Mender [ 16 фев 2014, 14:23 ] | |
| Заголовок сообщения: | Re: VPCEH (MBX-247) 1.5V is completely short |
It is impossible to have 0,6 ohm resistance and don't have any heating parts. With 10A current, you will have 60W power dissipation! After PQ24, 1,5V supplies VRAM. Connect PS properly and check again. |
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| Chazy-Chaz [ 16 фев 2014, 15:18 ] | |
| Заголовок сообщения: | Re: VPCEH (MBX-247) 1.5V is completely short |
Mender писал(а): It is impossible to have 0,6 ohm resistance and don't have any heating parts. Disagree. 0,6 Ohm is too low resistance and more than enough to heat any part on a motherboard. Mender писал(а): With 10A current, you will have 60W power dissipation! 60W dissipation would blow up anything! You meant to say 6W (0,6Vx10A=6W) ? It is still pretty enough to heat even big BGA chip. Don't hurry and seek better. |
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| Mender [ 16 фев 2014, 15:53 ] | |
| Заголовок сообщения: | Re: VPCEH (MBX-247) 1.5V is completely short |
Chazy-Chaz писал(а): 0,6 Ohm is too low resistance In compare with? Long thin wires and bad connections? May be... Chazy-Chaz писал(а): You meant to say 6W (0,6Vx10A=6W) P=I^2*R. |
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| Chazy-Chaz [ 16 фев 2014, 16:52 ] | |
| Заголовок сообщения: | Re: VPCEH (MBX-247) 1.5V is completely short |
Mender писал(а): P=I^2*R. Sorry, you're right. P=U*I=I^2*R. |
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| P.zonouz [ 17 фев 2014, 03:04 ] | |
| Заголовок сообщения: | Re: VPCEH (MBX-247) 1.5V is completely short [РЕШЕНО] |
Solved!! there is jointed ball under on of V-RAMs.Picked Up, so it is OK. |
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