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| XFX RX 580 Not turning on, missing Vcore, low 5V Repair | |
|---|---|
| Device | RX 480, RX 580, RX 590 |
| Affects part(s) | 5V LDO LM1117 |
| Needs equipment | multimeter, soldering iron, soldering station |
| Difficulty | ◉◉◉◌ Hard |
| Type | Soldering |
Problem description
Fixing a rare issue with the XFX RX 580 where Vcore/VDDCI are missing but EN and VCC are present. This particular issue is concerned with low 5V voltage.
Symptoms
- Missing VDDCI/Vcore
- Core not heating up/detected
- Less than 4.7V on 5V rail
Solution
Diagnostic Steps
- Measure the voltage present at the 5V Rail
- Voltage less than 4.75V will let other rails rise but not VCore Rail, as the NCP81022 requires at least 4.75V on its VCC pin. Refer to the repair steps below.
- If you measure 5V at the 5V rail, and EN voltage is around 3V and still no output on Vcore, you have another issue.
Repair Steps
- If you're measuring less than 4.75V on 5V rail, simply replace the 5V controller (Figure 1) on this card. It is the LM1117 LDO.
- This will enable the Vcore controller to work, verify by measuring Vcore, should be around 0.8V.
- If not, check other repair guides on the card's device page. You have another issue.
- If that's the case, assemble the card and stress test.