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2021-10-05 12:49 developer |
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Hi lonnie, Please add your comment. |
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Hi, RIver This message may cause Jitter issue. I think this issue caused using long FFC cable. Please analysis it with your HW team. Best regards Lonnie Kim |
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Hi Lonnie and Wooshin, We did some tests when issue happens. 1. When audio noise issue happens, we use i2c command to reboot A113x (i2cset 0 -y 0x20 0 0x99 b). Then the audio noise issue is gone. 2. Based on 1, we use reboot A113X command repeatedly to see if we can reproduce the audio noise issue by only reboot A113X. We reproduced it on 18th times reboot A113X. In above test, we did not change any I2S signal and just reboot A113X. If it is I2S jitter issue, it may fail every time to reboot A113X. So, it may has some bug in A113X image that may think the I2S data is invalid at certain booting case. Please also help to try check what is the criteria to take I2S signal as invalid. |
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Hi, River As attached A113X electrical Spec., I think I2S signals can not access 3.75V at any time. Best regards Lonnie Kim |
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Hi, Lonnie I measure power sequence and I2S timing on AMP board, all test result can meet A113X criteria. Measurement point: I2S LRCK input: 5R67 pin 2, I2S BCLK input: 5R68 pin 2, I2S Data input: 5R69 pin 2, I2S Data output: R110 pin 2 It looks that no signals voltage and timing issue. How about your opinion ? Attachec are the test report for you reference. Thanks ! |
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Hi, Lonnie Fii factory PE reply that he change capacitor value of C78 on AMP board from original 4.7nF to 10uF. Then he do power on/off test 200 times on 1pcs audio abnormal sample, no audio abnormal were found. I found the input capacitor value of both AP7366-18W5-7 and TMI6050 datasheet are 1uF. It looks that the capacitor value of C78 is too small of AMP board design. I will rework C78 to 10uF and power on/off test of audio abnormal sample on next Tuesday then reply to you. Thanks ! TMI6050.png (60,999 bytes) AP7366-18W5-7.png (53,781 bytes) |
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Hi, Lonnie Update 10/12 test result to you. Today I do two kinds of experiments on audio abnormal sample. First I change C78 to 10uF, and the secondly I change AMP board FFC cable. Both test result are still appear audio noise. Thanks ! |
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Hi Tom, What is your test step ? It is same with river's ? Hi Lonnie Can you check it also in our side ? |
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Hi, Tom Please check A113X I2S output timing(A113X and WA20 Amp IC). Best regards Lonnie Kim |
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image0.jpeg (76,068 bytes) |
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Hi, Lonnie I do some tests. 1. Pre-MP main board+ DVT3 AMP board: test 30 times, defact rate 0/30 2. Pre-MP AMP board: R343/R344: 100ohm ->0ohm, R103/R104: 100ohm->33ohm, C105/C106: remove, => defact rate 9/30, there were 2 severe audio noise 3. Pre-MP AMP board: solution 2 + R107~R110: 100ohm -> 33ohm => defact rate 8/30, there were only a pop noise when the first screen appear (image 0.jpeg) 4. Pre-MP AMP board: separate A113X I2S in and I2S out + DVT3 A113X firmware (as DVT3 design) R343/R344: 100ohm, R103/R104: 100ohm, R107~R110: 100ohm (as Pre-MP BOM) => test 30 times, defact rate 0/30 Thanks ! |
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Hi, Lonnie Update 10/25 test result. I correct Pre-MP AMP board+Pre-MP main board test result: test 30 times, defact rate 28/30. Pre-MP AMP board (HW/FW be recovery to Pre-MP design) + DVT3 main board, test 30 times, defact rate 30/30. Thanks ! |
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Hi, Tom Can you test below test using linked AMP s/w. Its version is 0x31. http://altserver01.iptime.org/A113_images/1021_0x31/ Pre-MP AMP board+Pre-MP main board Thanks. |
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Hi, Wooshin Sorry for answering you late. I havn't test s/w 0x31 yet. Because defact rate became worse after AMP board reworked. I am checking where the problem is. Thanks ! |
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Hi, Wooshin Defact rate of S/W 0x31 is 7/30. Before this test, I retest s/w 0x0a, the defact rate is 3/30 on 10/28, defact rate is 9/30 10/29. As you know this AＭP board is unstable, so the test result is for your reference. Thanks! |
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Hi, Tom Thanks for your efforts. |
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Hi, Sean & Tom We received audio noise sample today. But, we could not find any audio noise. Please refer to attached files. Best regards Lonnie Kim Audio issue SWAN.mp4 (1,374,138 bytes) Audio issue SWAN.jpeg (234,422 bytes) |
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Hi Lonnie, How many time did you reboot for test ? |
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Hi, Sean & Tom Please refer to attached file for audio noise analysis report. Please check below items 1. Audio noise - Please proceed power on/off test after change R values(5R67, 5R68: 200ohm -> 51ohm) 2. Overshoot/undershoot - Please check overshoot & undershoot of CX20810's I2S. Please let me know if you have any questions. Best regards Lonnie Kim |
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Hi, Lonnie Update the audio noise test report of the 2 SET to you. Sample NO.1: original design: defect rate 2/50, rework 5R67/5R68, 200ohm -> 51 ohm, defect rate 0/100 Sample NO.2: original design: defect rate 6/50, rework 5R67/5R68, 200ohm -> 51 ohm, defect rate 0/100 * The 2 SET both improved after resistor changed. Thanks! |
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Hi, Lonnie I measure overshoot & undershoot of CX20810's I2S on Pre-MP board. Both maximum and minimum voltage can meet CX20810's specification. BCLK: 3.504V (max), -344mV (min) LRCK: 3.400V (max), -360mV (min) Measurement point: BCLK: R6_17 pin1, LRCK: R6_19 pin1 Thanks ! BCLK LRCK Max Min value 1.jpg (158,147 bytes) BCLK LRCK Max Min value 2.jpg (157,151 bytes) |
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Hi, Lonnie Attached are scope 1GHz bandwidth test result. I also can pass test. Thanks ! BCLK LRCK Max Min value 1_scope full band width.jpg (186,039 bytes) BCLK LRCK Max Min value 2_scope full band width.jpg (187,886 bytes) |
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Hi, Tom Okay, I see. I will close this item. In addition, about ECO with EMI test result, we will release by 12/9(Thursday). We can book only Tuesday. Please understand our situation. Best regards Lonnie Kim |
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Hi, Lonnie Attached is the control run test result of audio noise issue (change 5R67 /5R68 to 51ohm). Control run sample quantities are 100pcs, power on/off test 50 times/pcs, no audio noise were found (defect rate: 0 %). So change 5R67/5R68 to 51ohm is a solution for ausio noise issue. Factory will keep monitoring about 200pcs power on/off test for next MP. The test report also mention about audio acoustics test problems of "Woofer speaker balance left_400Hz", "Woofer speaker balance right_400Hz", and "Full Range Speaker_Frequency Response - 1k Hz". Please help to review it. Thanks ~ |
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Hi, Lonnie I has released EC. So, I close this issue. Thanks ! |
- yk.jung ( (ALTech) Younkwang Jung ) developer
