Hi Guys,
Got an 820-3476 that was liquid damaged. Fixed this and was working fine but it's come back a month later with a beeping RAM issue. Checked voltages and I get all main power rails and machine in S0 state except I'm missing PP1V35_S3 (0V).
My U7400 readings are as follows and can't see anything obvious blown there but I've never diagnosed any problems on this circuit yet:
Any help would be appreciated on whether I'm missing any signals to the chip (I don't have a known good board to check against) and how to best troubleshoot further?
Thanks,
Jon
Got an 820-3476 that was liquid damaged. Fixed this and was working fine but it's come back a month later with a beeping RAM issue. Checked voltages and I get all main power rails and machine in S0 state except I'm missing PP1V35_S3 (0V).
My U7400 readings are as follows and can't see anything obvious blown there but I've never diagnosed any problems on this circuit yet:
| Pin | Voltage | Power Rail |
| 1 | 0 | DDREG_VTTSNS |
| 2 | 0 | PP1V53_S3 |
| 3 | 0 | PP0V675_S0_DDRVTT |
| 4 | 0 | GND |
| 5 | 0 | PPVTTRRD3_S3 |
| 6 | 1.8 | DDREG_1V8_VREF |
| 7 | 0 | GND |
| 8 | 1.3 | DDRREG_FB |
| 9 | 0 | DDRREG_VDDQSNS |
| 10 | 0 | GND |
| 11 | 0 | DDREG_DRVL |
| 12 | 5 | PP5V_S4 |
| 13 | 0 | DDRREG_LL |
| 14 | 0 | DDRREG_DRVH |
| 15 | 5 | DDRREG_VBST |
| 16 | 3.3 | DDRREG_EN |
| 17 | 3.2 | MEMVTT_PWR_EN |
| 18 | 0.5 | DDRREG_TRIP |
| 19 | 0 | DDRREG_MODE |
| 20 | 0.027 | DDRREG_PGOOD |
Any help would be appreciated on whether I'm missing any signals to the chip (I don't have a known good board to check against) and how to best troubleshoot further?
Thanks,
Jon