# LimeSDR USB Receiver issues

**URL:** <https://discourse.myriadrf.org/t/limesdr-usb-receiver-issues/8547>\
**Category:** LimeSDR\
**Created:** [30 October 2024 11:12 UTC](https://discourse.myriadrf.org/t/limesdr-usb-receiver-issues/8547 "2024-10-30T11:12:39Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![sangastrajingga](https://avatars.discourse-cdn.com/v4/letter/s/58f4c7/32.png) [@sangastrajingga](https://discourse.myriadrf.org/u/sangastrajingga)\
**Post date:** [30 October 2024 11:12 UTC](https://discourse.myriadrf.org/t/limesdr-usb-receiver-issues/8547/1 "2024-10-30T11:12:39Z")

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Greetings All,

It seems that my LimeSDR USB is failing some of the LimeQuickTest:

…  
[TESTING STARTED]  
-\>Start time: Wed Oct 30 08:21:56 2024  
-\>LimeSuite version: 22.09.1-ge83c13b9

-\>Device: LimeSDR-USB, media=USB 3.0, module=FX3, addr=1d50:6108, serial=0009060B00542814, HW=4, GW=2.23  
Serial Number: 0009060B00542814  
Chip temperature: 30 C

[Clock Network Test]  
-\>FX3 GPIF clock test  
Test results: 25403; 29159; 32915 - PASSED  
-\>Si5351C test  
CLK0: 17554 / 17554 - PASSED  
CLK1: 17554 / 17554 - PASSED  
CLK2: 17554 / 17554 - PASSED  
CLK3: 17554 / 17554 - PASSED  
CLK4: 17554 / 17554 - PASSED  
CLK5: 17554 / 17554 - PASSED  
CLK6: 17554 / 17554 - PASSED  
-\>ADF4002 Test  
Result: 10 - PASSED  
-\>VCTCXO test  
Results : 5112920 (min); 5113049 (max) - PASSED  
-\>Clock Network Test PASSED

[FPGA EEPROM Test]  
-\>Read EEPROM  
-\>Read data: 11 02 16 11 02 16 02  
-\>FPGA EEPROM Test PASSED

[LMS7002M Test]  
-\>Perform Registers Test  
-\>External Reset line test  
Reg 0x20: Write value 0xFFFD, Read value 0xFFFD  
Reg 0x20: value after reset 0x0FFFF  
-\>LMS7002M Test PASSED

[RF Loopback Test]  
Note: The test should be run without anything connected to RF ports  
-\>Configure LMS  
-\>Run Tests (TX\_2-\> LNA\_L):  
CH0 (SXR=800.0MHz, SXT=805.0MHz): Result:(-12.8 dBFS, 5.00 MHz) - PASSED  
CH1 (SXR=800.0MHz, SXT=805.0MHz): Result:(-15.1 dBFS, 5.00 MHz) - PASSED  
-\>Run Tests (TX\_1 → LNA\_W):  
CH0 (SXR=1800.0MHz, SXT=1805.0MHz): Result:(-13.2 dBFS, 5.00 MHz) - PASSED  
CH1 (SXR=1800.0MHz, SXT=1805.0MHz): Result:(-15.5 dBFS, 5.00 MHz) - PASSED  
-\>Run Tests (TX\_2-\> LNA\_H):  
CH0 (SXR=2500.0MHz, SXT=2505.0MHz): Result:(-50.4 dBFS, 5.00 MHz) - FAILED  
CH1 (SXR=2500.0MHz, SXT=2505.0MHz): Result:(-15.0 dBFS, 5.00 MHz) - PASSED  
-\>RF Loopback Test FAILED

=\> Board tests FAILED \<=

Elapsed time: 2.14 seconds  
…

The results of self\_test.ini quick tests on several frequencies:

 ![self_test1800](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/2X/a/a549ddfefae365dfa45185ae34433836e8e6aaa0.jpeg)  
 ![selt_test800](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/2X/1/1dca4e946c7de9bcd64bdf41681b0914c0429b26.jpeg)  
 ![selt_test2100](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/2X/8/89577807092eb0525d839b369a16db5a36d876d4.jpeg)

Any idea whether the hardware is broken?

AJ

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<div class="post-metadata">

**Author:** ![andrewback](https://avatars.discourse-cdn.com/v4/letter/a/22d042/32.png) [@andrewback](https://discourse.myriadrf.org/u/andrewback)\
**Post date:** [30 October 2024 13:30 UTC](https://discourse.myriadrf.org/t/limesdr-usb-receiver-issues/8547/2 "2024-10-30T13:30:48Z")

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> [@sangastrajingga](#):
>
> CH0 (SXR=2500.0MHz, SXT=2505.0MHz): Result:(-50.4 dBFS, 5.00 MHz) - FAILED

It looks like channel 0 LNA\_H is damaged, but fortunately you have two other LNA inputs on that channel, plus another three on channel 1. So I’d just avoid using that LNA input.