VFD doesn't like heat

[AGCB97]

View attachment 498598

Do you want the frequency fixed at 75hz or do you want it variable and set with the onboard potentiometer?

Mine is model HY01D523B

I don't understand the difference between the frequencies 003, 004, 005, 007, 011.

Is one of these the input frequency of the power line?

I want to run the motor at 75 Hz but be able to turn it down with the pot. How to do this please!
Thanks for your time/input

Aaron

 

[Harry Knutz]

Vizio TV's use the cheap 2000 hour capacitors in their power supplies (probably throughout the TV too). The 20,000hr capacitors were about 30% bigger and barley fit on the power supply board when I replaced them.

I will never buy a Vizio TV again.

In my home shop environment I would expect even the cheap electrolytic capacitors to last more than a year. But I do agree they are the first thing I would expect to go bad.

I still have a Large Vizio TV that my wife and I purchased at least 15 years ago, Quite possibly 20 at Costco when big TV's were still expensive. It still works good. My wife, God rest her soul watched a lot of TV so it has a lot of hours on it. It's going on ten years since she passed and I only watch it an hour or 2 before going to bed.

I have told myself if it broke I would buy another Vizio TV after having such good luck with this one. Maybe they started making them with cheaper components once the prices started coming down, I believe we paid around 1200.00 for the TV back then.

 

[Rich Berg]

I think a great number of large screen TVs and other electronics end up in landfills because of bad capacitors. Is a shame

I agree, cheap capacitors can be an issue. the problem seems to be that they have gone bad, but why is it temperature sensitive. I would also take a look at the temperature sensor on the heat sink.
In my early days as an electronics technician, we had a lot of problems with semiconductors getting stupid when they got hot. we used freeze spray and soldering irons to locate the root cause.
Rich

 

[WobblyHand]

If semiconductor thermal connections have failed they can act flaky. I've seen some components that have thermal pads underneath them fail if there was insufficient solder attaching them to the PCB. Or a cracked solder joint on that same area. Also no thermal compound for bolted connections, or loose bolts. Generally the symptom is overheating or malfunction under benign conditions. Without the thermal connection the die temperature rapidly reaches areas well above the rated operating point. Sometimes even within 5 seconds.

Check all heat sink connections. Also reflow solder joints, especially for parts with PCB thermal connections.

 

[woodchucker]

I just looked up my settings on my Huayang
Pd004 is 60
pd005 is 65 max freq (you would need to set this to 75).

Let me know if you need more. I think there might be others. But try that.

 

[AGCB97]

I just looked up my settings on my Huayang
Pd004 is 60
pd005 is 65 max freq (you would need to set this to 75).

Let me know if you need more. I think there might be others. But try that.

What do you have for PD003 and PD144?

Thanks, Aaron

 

[woodchucker]

What do you have for PD003 and PD144?

Thanks, Aaron

003 7.92
144 1440

 

[AGCB97]

OK.
Got it to run at 75 Hz, controllable with the panel POT. Set PD003, 4, 5 and 72 to 75 Hz. I'll check the actual motor RPM tomorrow and set PD144 accordingly.

Thanks
Aaron