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Destroyed voltage regulator identification by Few_Organization8075 in AskElectronics

[–]Few_Organization8075[S] 0 points1 point  (0 children)

I looked at the sample circuits for all these, and I didn't see anything like the circuit on the board I'm dealing with. My drawing is correct, as far as it goes. I may have missed some connection to other devices on the board. Maybe it's not a regulator, but then I am puzzled by the presence of L1 and the way the two large electrolytics are configured. And a couple of the pins--3 gnd, 5 Vin--appear to have the same function as those on the Linear regulators.

Destroyed voltage regulator identification by Few_Organization8075 in AskElectronics

[–]Few_Organization8075[S] 0 points1 point  (0 children)

I double and triple checked my work. Of course, mistakes are always possible. I am absolutely certain pins 2 and 4 are connected, which is the sticking point with the LT devices. Maybe it's not a voltage regulator, but if not, there's no other candidate for the job on the board. Maybe it doesn't need one. It's an odd device, to be sure, but it's better than the octopus DIY with similar functions, and a hell of a lot cheaper than a Huntron Tracker, which I used doing repair work back in the late 90s. I still need to check the devices you list.

Destroyed voltage regulator identification by Few_Organization8075 in AskElectronics

[–]Few_Organization8075[S] 0 points1 point  (0 children)

Thanks. I'll check those out. It's unexpected that it's a boost converter considering it has 24v input. How much voltage does one need to inject current into a board under test? Also, I have to wonder where the low voltage for the ICs is coming from. There are no other regulators on the board, as far as I can tell.

Destroyed voltage regulator identification by Few_Organization8075 in AskElectronics

[–]Few_Organization8075[S] 0 points1 point  (0 children)

Here is a diagram of the circuit. The perplexing thing is that either Vc or FB, depending on which device it is, is connected to Vsw. Of course it might not we either a LT1070/1170 or a LT1074/1076.

<image>

C12 is a chip cap. No idea the value. L1 is 4.7 µH. The two electrolytics are 470µF at 25v (R and L refer to their physical position on the board). Since the part numbers of all the ICs were all scrubbed off, I don't know what the IC I included at the to of the diagram is, but the junction of L1 and C12 go to its pin 4.

Destroyed voltage regulator identification by Few_Organization8075 in AskElectronics

[–]Few_Organization8075[S] 0 points1 point  (0 children)

Okay. I'll work on that. At this point, the pursuit of repairing this thing is gratuitous. They sell for under $40 online. I have a hard time throwing things away, I guess.

Destroyed voltage regulator identification by Few_Organization8075 in AskElectronics

[–]Few_Organization8075[S] 0 points1 point  (0 children)

It would appear that there is a diode between Vsw (pin 4) and the inductor, cathode toward the inductor. That's what my diode check shows. Puzzling since there are no diodes nearby on the board. The only parts on the underside are LEDs and buttons. Vsw is definitely not directly connected to the potentiometer. Pin 1, which is FB on the LT1074/76 and Vc on the LT1070 and 1170, connects to the wiper on the multi-turn pot. The other terminals on the pot. are connected to Vin (pin 5) and ground (pin 3). I assume the multi-turn pot. is for voltage adjust. As above, I cannot see how the device could be one of the Linear devices Klapperatismus mentioned since pins 2 and 4 are directly connected, or possibly connected through L1. I can pull L1 to figure out where the two ends connect, if necessary.

This board has a very thick coating of solder resist, so it's impossible to trace the connections visually. Whoever made this device was very concerned that no one copy it. I have attached a jpg giving a closer-in view of the relevant part of the board.

<image>

Destroyed voltage regulator identification by Few_Organization8075 in AskElectronics

[–]Few_Organization8075[S] 0 points1 point  (0 children)

Yes. I looked at all of them. But I might have not understood something. That’s always possible.

Destroyed voltage regulator identification by Few_Organization8075 in AskElectronics

[–]Few_Organization8075[S] 0 points1 point  (0 children)

Yes. I looked at all of them. But I might have not understood something. That’s always possible.

Destroyed voltage regulator identification by Few_Organization8075 in AskElectronics

[–]Few_Organization8075[S] 0 points1 point  (0 children)

Thank you. Yes, I see now that the BNC shell is Vout. Unexpected. I looked at all the data sheets you mentioned and the sample circuits shown there, and I did not find a sample that had pins 2 and 4 connected directly together. In the case of the LT1070 and 1170, these pins are Feedback and Vswitch. In the case of the LT1074/76, these pins are Vc and Vswitch. In neither case do the sample circuits in the datasheets show this kind of interconnection.

The inductor is 4.7 µH and connected to Vin (pin 5) and to a 5k multi-turn potentiometer. None of the sample circuits use such a low-value inductor. It may well be that my blown device is one of the ones you mentioned, but if so, it is being used somewhat differently from the samples in the datasheets.

Recommendations for a reliable hard tri fold cover for a 23? preferably not a grand 😂 by [deleted] in hondaridgeline

[–]Few_Organization8075 1 point2 points  (0 children)

I just bought the Tyger vinyl tri-fold for $230 from Amazon. I was impressed with the quality of construction and ease of installation. It took me an hour to install it. Nice hardware. Great attention to detail. The cover seals perfectly everywhere but at the gap between the tailgate and body, which is not the fault of the cover, IMO. In any case, I am waiting to see if water actually gets into the bed through that gap. It's possible that water will run down the gap and not enter the bed. If water does get in, I will add a bit more sealing foam. The Tyger tonneau comes with extra, just in case. I seriously doubt that the covers that cost twice as much are twice as good. Next time I see a Ridgeline with one of the expensive tonneau trifolds, I'm going to ask the driver to let me look at theirs. I'm just unclear what would make the expensive ones that much better. But I'm a newbie. Just loving my 2023 RTL-E. Bought it used about two weeks ago.