It was newly bought on eBay so no point to start repairing. I just returned it. This problem is common with some Hantek Scopes and there is a very good video already about it here:- kzbin.info/www/bejne/jmfUZX2ZhLF-has Cheers..

Thanks for sharing that. I've been looking at those on ebay. It looks like a software fault but that's no help to you. Please let us know if you have any success with a refund or replacement.

No problem.. Yes the seller is very good and I've dealt with her before. She apologised and sent my refund. I know it's a production fault and not the seller so will continue to buy from her. She told me if I want to buy another and find a fault she'll refund it again. I have several Tektronix Scopes but none of them do serial decoding so I may buy another Hantek just because they have a comprehensive serial decoding that includes RS232/UART, I2C, SPI, CAN, LIN.@@warwickbunn1250

Hello Ivo Matos.. I have added an email for you to contact me directly. You can find it in my channel under 'ABOUT'. I look forward to hearing from you.. rgds Tony

Hi.. Sorry I am very bad that I did not visit any of my videos for a long time and I got no notification that you had asked me a question.. and just by chance saw your message today. There is almost no information available for the TR4131 and I could not find any when I was faultfinding mine.. but the later model Advantest R1431 has some similar mixer frequencies and power levels and the service manual for that one was available on the internet so you could have a search for that.. and it may help you. I actually stopped working on the analyser because I was very busy with other things so did not make further progress with it. One day I will take another look (!) So is your analyser making those same strange off the screen scans as mine was..? I'd be interested to know. Only one person suggested something on the first video but he was way off course because even if the input diodes were damaged you would still have the 'x' scanning noise floor. So I disregarded what he said. Nobody else knew what the problem could be it seems.. as I got no further suggestions.. and my own analyser had already had several engineers look at it before I owned it.. and none of them could fix it either. Keep in touch if you like and let me know how you get on with yours.

Hello Fernando.. It's strange that I did reply here before to you but now I do not see my message.. I also did send you my email address but never heard back from you. You are welcome to still contact me if you wish.

Hello. I have just received your reply!!. Not the previous one..... Sorry. I purchesed allí the smd att resistirse but i do not replece them. Todo mucho work here. I Will do asap and comment here. Tks for your interest. Fernando Costarelli

Good to hear back from you again Fernando. Yes let me know how you get on with your repair 👍@@lu1hko

richard ward go to a channel always press program button first before entering a frequency

www.n5hq.com/Manuals/Realistic/Pro-2006.PDF Have a read here

Hi John.. and my apologies for not answering you back when you posted this message. Truth is I've been busy fighting cancer and never even saw this until today!.. If you see this reply and still have the Redifon let me know how it's doing now.. ;-) best wishes Tony