LeCroy HDO4024 no data on any channel. - Page 1
Forum section: electronics / repair

author: Putnu_veerotajs
author_rank: Newbie
timestamp: March 20, 2025, 09:00:00 pm
content: Hello.I have been using a LeCroy HDO4024 oscilloscope for some time. Once turned on, everything worked, except that none of the channels display a signal. It says that there is no data on any channel. And it shows that it is waiting for a trigger. Maybe someone has encountered such a defect. Visually, the damage cannot be seen on the oscilloscope board.Maybe someone has a service manual available.Thanks in advance.

author: Swake
author_rank: Frequent Contributor
timestamp: March 22, 2025, 05:47:07 pm
content: Would it be configured for external trigger input?Guess you have checked the classics like power supplies and ripple?No errors? self test or diagnostics?

author: Putnu_veerotajs
author_rank: Newbie
timestamp: March 24, 2025, 08:22:08 pm
content: Nothing changes when you change the trigger input.I performed a diagnostic test. An internal inconsistency was detected. I have attached a screenshot.A dump file was created. For now I am trying to understand how to open it and what information it can give me.Which program can open and read the .dmp file? I have attached it too.About power rails. It looks like there are 6 voltage regulators on the data acquisition board. I haven't measured all of them yet, but the 3 I measured have the following voltages - 1V; 1,5V; 3V. Maybe there is some info on what the voltages should be?

author: Swake
author_rank: Frequent Contributor
timestamp: March 24, 2025, 09:01:13 pm
content: That looks like a Windows minidump. Can't help much with that, but here is a link that explains it somewhat:https://learn.microsoft.com/en-us/troubleshoot/windows-client/performance/read-small-memory-dump-fileI would not expect this dump to happen unless there is a software corruption of some sorts.

author: voltsandjolts
author_rank: Unknown
timestamp: March 24, 2025, 09:11:14 pm
content: Quote from: Swake on March 24, 2025, 09:01:13 pmCould be an unlikely hardware failure that the software hasn't been coded for, and caught in the app level exception handler.

author: Putnu_veerotajs
author_rank: Newbie
timestamp: March 28, 2025, 08:42:52 am
content: I inspected the data acquisition board with a thermal camera. Picture attached.Strangely, none of the FPGA chips are heating up.I made more precise voltage measurements at the voltage regulators. There are 6 on the board.1.84V; 2.53V; 3.25V; 2.12V; 1.80V; 1.02V.Shouldn't there also be 5V on the board?What could cause all 4 channel FPGAs to fail?

author: voltsandjolts
author_rank: Unknown
timestamp: March 29, 2025, 11:02:30 am
content: Cold fpga's suggest...missing voltage railno main clock sourcefpga firmware not loaded

author: Putnu_veerotajs
author_rank: Newbie
timestamp: April 07, 2025, 07:16:32 pm
content: Thank You for your answers.I got access to production service menu. There were additional self tests available. This time I got some more information out.I will paste all failed tests, hope that maybe someone could make sense out of it and help me understand what is wrong with my device.And I found it strange, that on one power rail, when measuring in diode mode reading was 0,003V and resistance was 9 ohms., but it still gave 1V out. Maybe it is normal.Thank you in advance.JTAG Scan Devices ...JTAGChainDevicesID StartsChain 0: There are no Devices on JTAG Chain 0:Chain 1: There are no Devices on JTAG Chain 1:Chain 2: There are no Devices on JTAG Chain 2:Chain 3: There are no Devices on JTAG Chain 3:Chain 4: There are no Devices on JTAG Chain 4:Chain 5: There are no Devices on JTAG Chain 5:Chain 6: There are no Devices on JTAG Chain 6:Chain 7: There are no Devices on JTAG Chain 7:Chain 8: There are no Devices on JTAG Chain 8:Chain 9: There are no Devices on JTAG Chain 9:Chain 10: There are no Devices on JTAG Chain 10:Chain 11: There are no Devices on JTAG Chain 11:Chain 12: There are no Devices on JTAG Chain 12:Chain 13: There are no Devices on JTAG Chain 13:Chain 14: There are no Devices on JTAG Chain 14:Chain 15: There are no Devices on JTAG Chain 15:JTAGChainDevicesID Ends Communication\JTAGScanDevicesJTAG Chain Continuity SelfTest starts.JTAG Chain 0: FAIL!!!TriggerFPGA,MTT634,Read Out:0::0x00000000 1::0x000000002::0x00000000 3::0x000000004::0x00000000 5::0x000000006::0x00000000 7::0x000000008::0x00000000 9::0x0000000010::0x00000000 11::0x0000000012::0x00000000 13::0x0000000014::0x00000000 15::0x00000000Feedback data is not expected. 0xAAAAAAAA.JTAG Chain 1: This is no Devices on this Chain. JTAG Chain 2: This is no Devices on this Chain.JTAG Chain 3: This is no Devices on this Chain. JTAG Chain 4: This is no Devices on this Chain.JTAG Chain 5: This is no Devices on this Chain. JTAG Chain 6: This is no Devices on this Chain.JTAG Chain 7: This is no Devices on this Chain. JTAG Chain 8: This is no Devices on this Chain.JTAG Chain 9: This is no Devices on this Chain. JTAG Chain 10: This is no Devices on this Chain.JTAG Chain 11: This is no Devices on this Chain. JTAG Chain 12: This is no Devices on this Chain.JTAG Chain 13: This is no Devices on this Chain. JTAG Chain 14: This is no Devices on this Chain.JTAG Chain 15: This is no Devices on this Chain.Test has failed on 1 ChainsJTAG Chain Continuity SelfTest has failed 1Communication\JTAGContinuityTestJTAG Register Read/Write SelfTest starts.Chain Index 0: FAILED: FailNum = 1Mtt.StateControlW:Failed!! (Reading failed, no value came back. iteration index:0)Chain Index 1: PASSED Chain Index 2: PASSED Chain Index 3: PASSED Chain Index 4: PASSED Chain Index 5: PASSEDChain Index 6: PASSED Chain Index 7: PASSED Chain Index 8: PASSED Chain Index 9: PASSED Chain Index 10: PASSEDChain Index 11: PASSED Chain Index 12: PASSED Chain Index 13: PASSED Chain Index 14: PASSED Chain Index 15: PASSEDCommunication\JtagRegRWTestError4.7.2025 18:07:59Self TestRead Board and Chip VersionRead Board RevisionsMain Board FPGA Revision : 8207PCIe Driver Revision : 66MicroController Revision : 530Driver Build Number : 78Unable to Read some board or Chip Version Numbers.Communication\ReadVersionRead Board RevisionsMain Board FPGA Revision : 8207PCIe Driver Revision : 66MicroController Revision : 530Driver Build Number : 78Unable to Read some board or Chip Version Numbers.Communication\ReadVersioncommunication link 3: Gigabit LinkGigabit TestLink Index 1: PASSED Link Index 2: PASSEDLink Index 3: PASSED Link Index 4: PASSEDCommunication\GigabitSelfTestReadOut TestGigabit Link 0:MAMAddress: 0x01 = 1ReadPointer = 0x0200Length = 0x0400NbOfMAM = 1uiStatus = 0000 (Read back data length)ERROR --- Error! No Data.ERROR --- ERROR !! DMA operation Timed out.This Link test has Failed.Gigabit Link 1:MAMAddress: 0x41 = 65ReadPointer = 0x0200Length = 0x0400NbOfMAM = 1uiStatus = 0000 (Read back data length)ERROR --- Error! No Data.ERROR --- ERROR !! DMA operation Timed out.This Link test has Failed.Gigabit Link 2:MAMAddress: 0x81 = 129ReadPointer = 0x0200Length = 0x0400NbOfMAM = 1uiStatus = 0000 (Read back data length)ERROR --- Error! No Data.ERROR --- ERROR !! DMA operation Timed out.This Link test has Failed.Gigabit Link 3:MAMAddress: 0xC1 = 193ReadPointer = 0x0200Length = 0x0400NbOfMAM = 1uiStatus = 0000 (Read back data length)ERROR --- Error! No Data.ERROR --- ERROR !! DMA operation Timed out.This Link test has Failed.Communication\ReadOutTestFPGA Register Test starts.Read Register Status:ABC : 0x0Acq : 0x0MGT : 0xFEEE0000ABC2 : 0xF400JTAG : 0x10010ASPI : 0x10010ASRAM : 0x0Communication\FPGARegSelfTestSRAM Self Test Starts.SRAMSelfTest fail 65266.Communication\SRAMSelfTestDRAM Self Test Starts.DRAM SelfTest Pass!Communication\DRAMSelfTestFPGA Acquisition State machine SelfTest starts.Stop: 0x0Run: 0x0Acquisition should be running, bit0==1.error: acqControl.bits.AcqProgress = 0 (bit0: 1:Acq running,0:idle, done, stopped.)Stop: 0x0TimeOut: 0x0Acquisition should be running, bit0==1.error: acqControl.bits.AcqProgress = 0 (bit0: 1:Acq running,0:idle, done, stopped.)bit 0: acqControl.bits.AcqProgress = 0 (1:Acq running,0:idle, done, stopped.)bit 1: acqControl.bits.AcqDone = 0 (1:Acq done,0:idle, not done.)bit 4: acqControl.bits.AutoTriggered = 0 (1:Acq done,0:idle, not done.)pbTriggered = 0Stop: 0x0FPGA Acquisition State Machine SelfTest fail. bFailTest = 2FPGA Acquisition State Machine SelfTest Ends..Functionality\FPGAAcqStateDelay Clock SelfTest starts.Connect NCO to FrontEnd input.Delay Clock Control setting: : 0x0Delay Clock SelfTest fail. bFailTest = -2147024809Delay Clock SelfTest Ends..Functionality\DelayClockTestFrontEnd OffSet Test starts.FrontEnd OffSet Test fail. bFailTest = -2147024809FrontEnd OffSet Test Ends..Functionality\FEOffSetTest

author: zhongzuocheng520
author_rank: Contributor
timestamp: April 10, 2025, 07:44:44 am
content: Recently, I had to repair a device with the same issue as yours: no baseline signal. In my case, the ADC lacked -10V voltage. Upon inspection, I found that resistor R202 was open and capacitor C189 was shorted, which resulted in the DC-DC converter failing to produce -11V output.