| Electronics > Repair |
| PLD getting hot |
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| kraka:
--- Quote from: fzabkar on September 25, 2024, 08:07:19 pm ---Have you measured the output voltages at VR1 - VR5 ? --- End quote --- Excuse me, but what is VR1 and VR5 ? I can only inject Voltages (No more that 5 Volts- Now i learned my lesson...) off board. |
| fzabkar:
VR1, VR2, VR3, VR4, VR5 are 5 linear power supplies (+/- 5V, +/-8V, +3.3V). |
| kraka:
--- Quote from: fzabkar on September 25, 2024, 10:06:32 pm ---VR1, VR2, VR3, VR4, VR5 are 5 linear power supplies (+/- 5V, +/-8V, +3.3V). --- End quote --- I just measured the +8 and +5 Voltage Regulator's input and output. Inject : 12 Volt Input for both : 12 Volt Output for +8 : ~8 Volt (7.90) Output for +5 : ~4 Volt (3.88) measurements on board-Card (for Regulators), off motherboard (for Card) I do not know how to inject -12 Volt... OK, I learned how to do it. Inject : -12 Volt Input for both : -12 Volt Output for -8 : -8 Volt Output for -5 : -5 Volt As i can see from the datasheet of +5, the minimum output is 4.75 Volt and as you can see i got 3.88. It is a new one because i have, already, replaced the old one. Before replace it, again, is there else that maybe cause this wrong output ? |
| Ice-Tea:
I don't understand what you mean by injecting a voltage. But that +5V rail is not fine. To be precise, it looks like it sits above one diode above 3V3. From the keying of your PCI card, it seems like it is supposed to wotk in 3V3 and 5V PCI environments but that measurement looks like it behaves like a 5V driver on a 3V3 bus. Maybe. I don't remember enough about the PCI spec, especially not about how dual voltage cards are supposed to work to help. |
| kraka:
--- Quote from: Ice-Tea on September 26, 2024, 11:44:39 am ---I don't understand what you mean by injecting a voltage. But that +5V rail is not fine. To be precise, it looks like it sits above one diode above 3V3. From the keying of your PCI card, it seems like it is supposed to wotk in 3V3 and 5V PCI environments but that measurement looks like it behaves like a 5V driver on a 3V3 bus. Maybe. I don't remember enough about the PCI spec, especially not about how dual voltage cards are supposed to work to help. --- End quote --- I am sorry, but i have modified my previous post @fzabkar. Can you please re-read it ? When i am saying injecting Volts to the Card, i mean this : I have a Voltage Supply Station, in which i can variate Voltage output. This Device has two probes, one red one black. So, i connect the black one to the GND of the Card, and the red one to the Cards pin which is made to accept whatever Volts i want at this time. Then i switch the Volt selection switch to the Volt i want and as Voltages are created, then current flows in to the Card. At the same time i am measurement with the help of my multi-meter, the voltage comes in and out from the component i want to diagnose. |
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