Lecroy WaveRunner 6050 help - Page 1
Forum section: electronics / testgear

author: sprit
author_rank: Regular Contributor
timestamp: April 30, 2025, 01:40:27 pm
content: Hello everyone, have a nice day.I was given a Lecroy WR6050 by a brother in a non-working condition.After bringing it home and checking it, I found that the motherboard was damaged, some of the capacitors on it were leaking. I cleaned and replaced all the capacitors on it. I continued to check the acquisition board below and I found a pretty big burn mark in the power area. Based on the Schematic, I sanded off the burned circuit layers and reconnected them and did some basic measurements, the output sources were guaranteed to be correct. The ripple was also guaranteed to be within acceptable range.I reassembled everything and proceeded, and boom, it powered up. Then it entered windows as usual, the XStream software recognized the scope code correctly. But the real problem started here. When the software starts, there is no trace on the screen, I tried to turn on all 4 channels but failed. When I press autoset, I can hear the relay clicking sound, but the software response is very slow, the status line "Auto Setup" in the bottom right corner loading is very slow. I thought it was a software error and did a backup of the calibration folder, then updated to windows XP and installed the latest version (6.5.3 I think, some people said there is a version 8.6 but I don't know where they found them, I got this version from Lecroy's homepage) but the problem still occurs. There is no trace on the screen. I accessed the Service menu with code 9472 and did a self-test and power test but it immediately failed. In Aladin I did the self-calibration process, but the scope became strangely slow, after about 5-10 minutes the screen started to show traces but it was still frozen, all functions were frozen. I left it overnight in calibration mode but it still made no difference. I have attached some pictures below. I look forward to your comments. My English is not good so if there is anything wrong, I hope you understand.SincerelyFeng

author: sprit
author_rank: Regular Contributor
timestamp: April 30, 2025, 01:55:41 pm
content: HiSorry I don't understand why the pictures I uploaded are upside down, on my computer they are in the correct position. Sorry for the inconvenience.Sincerely,Feng

author: sprit
author_rank: Regular Contributor
timestamp: April 30, 2025, 01:57:08 pm
content: By the way I also updated the link of some XStream versions I have on my machine in case anyone needs it. Here is the link to my G Drive. Hopefully they don't crashhttps://drive.google.com/file/d/1xEZ2f3woyQlOe7qWXe2mak_vDCzGOq9i/view?usp=drive_link

author: sprit
author_rank: Regular Contributor
timestamp: May 10, 2025, 07:01:33 am
content: Hello. How is everybody today?This seems like a post for me lol. Today I took it apart and tried replacing the MB with a newer one and the scope had a strange behavior. When I hit AutoSet the scope responded very quickly but it outputted some weird waveforms, like some kind of demo where channel 1 was a sine wave, channel 2 was a triangle wave, channel 3 was a square wave, and channel 4 was a pulse wave. I was like "What the heck is going on?" I was really confused. There were no probes connected.The scope turned itself into a lower model WR6030 when it was a 6050... The input selector only had 50 Ohm and GND options, no more 1M ohm AC/DC.On the new motherboard the scope responded very quickly (I'm using an old G41 motherboard of mine) but it didn't seem to improve much, the error still persisted.I decided to put the old motherboard in and test it again and everything is the same, the machine keeps hanging on Calibration, no response to buttons. Scope ID suddenly became 6030 for no reason. I am waiting for another MB to arrive, it is a newer socket 775 MB but still uses the classic AGP slot. Hope it works.

author: Martin72
author_rank: Super Contributor
timestamp: May 10, 2025, 11:47:13 am
content: Hi,QuoteThis may be because there aren't many LeCroy repair experts here, and because your posts look like continuous text, which is difficult to read.Here are two threads that may be able to help you further:https://www.eevblog.com/forum/testgear/lecroy-wr6050-custom-bios/msg5676957/#msg5676957https://www.eevblog.com/forum/testgear/lecroy-options-recovery/msg1312975/#msg1312975

author: sprit
author_rank: Regular Contributor
timestamp: May 21, 2025, 08:35:53 pm
content: Today I decided to open it up again and take a look at the whole thing. And guess what, 2 of these ADCs were on fire. They were grayed out in the middle (LTC1664) and one of them was so hot that it melted the other 12GHz rail (U35)The board was blown up in the picture below (I fixed it) and I forgot to check the other components on that -4V rail. Now I look back and find out.I'm waiting for the parts to arrive and replace them, at least it's progressing xDI'll update as soon as the parts arrive.

author: nctnico
author_rank: Super Contributor
timestamp: May 21, 2025, 09:05:25 pm
content: I'd check the power supply rails before replacing the components. And don't turn it on without the bad components still in place. If you are lucky, the ADCs prevent further damage by shorting the bad supply rail.Always make sure the power rails are OK before doing any replacements (or turning the power supply on with electronics attached). I learned that lesson the hard way a long time ago. I got a broken LCD monitor in the early days when these where extremely expensive. I found a chip that got hot so I replaced it. Turned the LCD monitor on and this time some FPGAs started smoking after a while. In the end it turned out the (external) power supply was flaky and it would put a much higher voltage on the 5V output every now and then. But since the FPGAs where pre-programmed, replacement was not an option.