We'll be happy to send you replacement chip. Please contact us at jyetech@163.com.
Can you check the voltage at the input pin of LM1117? Just to make sure it is the chip's problem.
White screen, lm1117 is heating
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Re: White screen, lm1117 is heating
With the three pins pointing down, and the one big pin facing up, numbering the pins from 1 to 3 from left to right, I get 3v across 1 & 2 and 8v across 1 & 3. I get about 9v out of the power jack.
Code: Select all
____
| |
+-------+
|LM1117 |
+-------+
| | |
1 2 3
Re: White screen, lm1117 is heating
These results are good. But you said you got 2.25V at +3.3V test point. The test point was actually the same node as pin 2 of LM1117. Either one is incorrect. Can you double check?
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Re: White screen, lm1117 is heating
I guess I should have let it heat up before taking the readings. I'm getting 2.4v between 1 and 2 and 3.5v between 1 and 3 after it heats up.
Also, I noticed that the two 3.3v spots on J3 and J5 are .1v lower than pin 2 when measured from pin 1. So pin 1 to 3v3 on J3 is .1v lower than pin 1 to pin 2. But the test point near the LM1117 is directly connected and equal to pin 2.
Rick
Also, I noticed that the two 3.3v spots on J3 and J5 are .1v lower than pin 2 when measured from pin 1. So pin 1 to 3v3 on J3 is .1v lower than pin 1 to pin 2. But the test point near the LM1117 is directly connected and equal to pin 2.
Rick
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Re: White screen, lm1117 is heating
Should R30 be unpopulated? I was just looking at my board, and R30, right near the 1117, is unpopulated.
Rick
Rick
Re: White screen, lm1117 is heating
Yes. Its Step 1.7 on the first page of the User Manual.rickseiden wrote:Should R30 be unpopulated? I was just looking at my board, and R30, right near the 1117, is unpopulated.
Rick
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Re: White screen, lm1117 is heating
I had forgotten that step 1.7 had us remove that resistor. So it is normal for there to be nothing there.
Rick
Rick
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Re: White screen, lm1117 is heating
bump
I guess I should have let it heat up before taking the readings. I'm getting 2.4v between 1 and 2 and 3.5v between 1 and 3 after it heats up.
Also, I noticed that the two 3.3v spots on J3 and J5 are .1v lower than pin 2 when measured from pin 1. So pin 1 to 3v3 on J3 is .1v lower than pin 1 to pin 2. But the test point near the LM1117 is directly connected and equal to pin 2.
Rick
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- Posts: 11
- Joined: Sat Mar 04, 2017 8:49 pm
Re: White screen, lm1117 is heating
Since I wasn't getting anywhere with support, I went ahead and bought my own AMS1117 3v3 chip and replaced it on my DSO. The new chip is doing exactly the same thing. Heating to the point where you can't touch it. The screen stays white the whole time.
Can someone at JYE Tech please help with this? I have a useless brick right now.
Can someone at JYE Tech please help with this? I have a useless brick right now.
Re: White screen, lm1117 is heating
Hi Rick, did U1 get hot too? If U1 was hot it might have been damaged. Please contact us at jyetech@163.com for a board replacement.