I don't know why you have the transformer attached with 30cm long wires? What is the purpose of this?
Perhaps it is upsetting the measurements?
Agent24
I see dead caps
Last Activity: Today, 08:21 PM
Joined: 10-04-2007
Location: Hiding inside a plated-through hole
-
As expected, but always worth a try.
Funny how China likes copying everyone else but refuses to share.
Some companies actually do help, but I guess not this one.Leave a comment:
-
I don't think that's going to be good for it... why are you doing this?
At that price they sound suspicious... could be fakes
Maybe the original chip blew thanks to the dead input filter capacitor...
Then, the new chips you had (if from China as well) maybe just can't handle 230v or have other issues...
Incorrect output voltage could also be due to fake chips....Leave a comment:
-
I think he said the board came with a BA159 originally, so it would be fine, but I agree... photos!!!...Leave a comment:
-
Better off to contact Baofeng directly:https://www.baofengradio.com/pages/customer-service...Leave a comment:
-
Interesting - that idea never crossed my mind.
I assume the firmware files are rather hard to come by, however?...Leave a comment:
-
Semiconductors don't usually wear out like capacitors do, but having spares is never a bad idea, of course.
I don't know off the top of my head what would be suitable replacements, however.
But it sounds like both channels are working? So I would leave it alone for now unless it stops working.
Your issues with A/B speaker outputs sound like a switch or wiring issue - if the power amplifier section was bad, none of the speaker outputs would work.
The fact that any outputs work, means the amplifier section works.
Unless you have one working channel...Leave a comment:
-
Plugged into the OBD connector wrong?...Leave a comment:
-
I guess it's a new chip too that nobody's heard of yet.
I wonder if trawling through DC-DC converters on LCSC or something would help...
Why don't they just use a MC34063 if all it's doing is charging a battery
not like efficiency matters in that scenario.
Has anyone tried asking Baofeng what chip they used? Probably they'll ignore you but who knows, maybe they'd be helpful. Lol....Leave a comment:
-
Thought I had it with the XC6367 from Torex, but the pinout is all wrong. And it uses an external transistor anyway.
Annoying when you don't know which part of the code is part number and which is lot/factory/date etc code.
If you can get your hands on (or PCB photos of) another radio the same model but different year production it may helpLeave a comment:
-
Show us a photo of this area... It doesn't matter if the distance is large, the pins are still close together in the end, and if they are not clean (flux residue etc) there can be leakage current that turns into electrical breakdown and failure....Leave a comment:
-
If they are working, why do you want to change them?Leave a comment:
-
What kind of fault causes this image error?
I took a look at a television for a friend, it has some serious image fault. I don't know what the cause is or if such a fault is even repairable.
The T-con board seems to be integrated into the panel so looks even more annoying to work on than normal.
What's the most likely cause of this problem, does anyone know?... -
Good idea! Why didn't I think of that?.... haha...Leave a comment:
-
It's not even age, though. If you still have radio broadcasts then the technology is current. Aligning a receiver is just a skill, as long as one has the right tools. You can find information online. Well maybe the guy can do it right, now that you fixed the problem it seems.
https://www.youtube.com/watch?v=-A_DxsxPdeILeave a comment:
-
Heat does not always mean a short
Voltage regulators can get hot due to overloading caused by shorts elsewhere
The question is are the other hot parts up, or downstream, electrically, from the regulator?...Leave a comment:
-
Nice work with the coil! I guess we will never know if the radio was aligned correctly before or not.
The filter is probably fine, I'd say it needs to be realigned by someone who knows what they're doing... then you might actually get the proper signal level, the RF sections are probably all out of whack now thanks to the previous guy working on it with the bad coil.
I don't know if the filter needs to go in a certain way, I guess not but maybe someone else can confirm.
You could always just change it and see what happens I suppose.Leave a comment:
-
Excessive current draw pulling the voltage down? And whatever faulty part is also causing the distortion?...Leave a comment:
-
T4 is the final coil with output into the detector circuit so yes, if you had a problem with that coil, I would say it could definitely cause a problem like you describe.
And 25k ohm reading does sound too high to me. The winding could have a break somewhere.
What reading do you get between that winding's center tap and the other pins? Is one side different to the other?
Or are they both 25k?Leave a comment:
-
Not sure how this works exactly, I assumed it connected to a computer via USB or something?Leave a comment:
No activity results to display
Leave a comment: