| ??? 06/19/12 13:34 Read: times |
#187792 - Hardware check Responding to: ???'s previous message |
looks like you have a hardware problem. Is the circuit new?
Was the circuit working and it got broken? usually it is hard to repair broken boards from manufacturers. Do visual test with a magnifier there might be bad track, two data bus tracks shorted together or open, bad soldering, dry joint, broken track, swollen or cracked ic, bad electrolytic capacitor. Use your senses, does any chip get hot, measure total current consumption of the board and compare it to the good one, if it draws too much current then usually the bad component gets hot. Since your 5v drops to 4v that means either the power supply doesn't have enough current to power the board, or one or more of the components draw too much current loading the supply. Once you are sure your hardware is good then you start writing debug software. I just used a microcontroller development board as IC tester, made an adapter board with 16 pin socket on my cnc and wrote code to test DS7835 chips and if pass I get a steady LED on, if fail the LED blinks. Over the years I will have a big library of non standard chips that I can't test on my ic testers. Good luck. Mahmood |
| Topic | Author | Date |
| circuit repair, high level of all adress bytes | 01/01/70 00:00 | |
| what's on P2 is not that intersting initially, ... | 01/01/70 00:00 | |
| oszi daten | 01/01/70 00:00 | |
| depends on the app, but still | 01/01/70 00:00 | |
| we'll need a schematic, I believe. | 01/01/70 00:00 | |
| general guidelines | 01/01/70 00:00 | |
| RE | 01/01/70 00:00 | |
| Hardware check | 01/01/70 00:00 | |
| anyhow this begs a question | 01/01/70 00:00 | |
| Replay | 01/01/70 00:00 | |
| It wouldn't hurt to know how you've connected your hardware | 01/01/70 00:00 | |
| new | 01/01/70 00:00 | |
| Just curious... | 01/01/70 00:00 | |
I have to agree with Hal, it can't be done ... | 01/01/70 00:00 |