Hi everybody
Sorry for my english, isn't my native language
For some problems on my radio i had to buy a main board to KGL on internet and they sent me one "new", but no was so, it was repaired unit and had some problems. so i claimed to paypal to help me and while i was waiting for the answer kgl tried to help me to repair the broken mainboard and sent me the material that i share here.
finally my problem was on TFT board (1 resistor died) and paypal refund me the money, and today i'm very happy because now i can listen MY music after 5 long months.
Maybe we can see something that can be improve to get a better radio(sound, signals, etc) and is easy track the routes with this software.
i tried to upload the software to open the pcb but i cant, so the program name is PADS9.5, try to download it from google
https://www.pads.com/downloads/standard-eval-request
i call @Digo69 to explain us how to made the mod he told here http://forum.xda-developers.com/showpost.php?p=67892872&postcount=464
thanks
@7floor take a look
i had been looking on pcb file the bluetooth mod and i think is no needed, take a look on yellow tracks, the radio has done the mod, the problem is the kind of jack for the micro because the original mic jack is a 3 pins, which 1º pin is groud, 2º pin is the mic for bluetooth and tracks go to c32 and c32 go to pin 4 on bluetooth module (pin 2 pic) and 3º is mic for system (pin 3 pic), i only can see two separated ways for sound inputs.
maybe c144 do some modification on bluetooth mic, because it's connected to c32 (jumper) pin 4 on bluetooth module and ground
we only have to use a 3 pin male jack (stereo) and use an aftermark mic usin pin 2 + and pin 3- pin1 no connected (only for bluetooth mic in) or pin 1 and 2+ and pin 3- for both mic in
what do you think?
look
elcolombia17 said:
Hi everybody
Sorry for my english, isn't my native language
For some problems on my radio i had to buy a main board to KGL on internet and they sent me one "new", but no was so, it was repaired unit and had some problems. so i claimed to paypal to help me and while i was waiting for the answer kgl tried to help me to repair the broken mainboard and sent me the material that i share here.
finally my problem was on TFT board (1 resistor died) and paypal refund me the money, and today i'm very happy because now i can listen MY music after 5 long months.
Maybe we can see something that can be improve to get a better radio(sound, signals, etc) and is easy track the routes with this software.
i tried to upload the software to open the pcb but i cant, so the program name is PADS9.5, try to download it from google
https://www.pads.com/downloads/standard-eval-request
i call @Digo69 to explain us how to made the mod he told here http://forum.xda-developers.com/showpost.php?p=67892872&postcount=464
thanks
@7floor take a look
Click to expand...
Click to collapse
Can you ask for them to send you schematics? These are board designs, somewhat useful.
Related
Hi all,
As i started servicing all pdas for a couple of monthes (only as a hobby, i fix them for friends and relatives), i came across one BA that gave me some trouble.
i got it to replace its LCD that was broken as it was dropped and thats very simple to replace it, so far so good. now it has two main problems :
1. no sound from speaker (even when in speakerphone mode), but there is sound in the stereo earphones (i plugged to the connector by the sd card slot). - i can only assume that a bluetooth handsfree device it will also work.
2. although the backup battery is fully charged, if i remove the main battery even for a brief second, when turned on, the BA acts as if i made a hard reset.
as for solving the problems :
1. using a digital multimeter, i managed to track the conductivity from the internal speaker through its connector, flat ribbon to the connector which connects to the main pcb - so there is no contact problem from the speaker to the main pcb.
using the help from WIKI, i went to site that has the list of all components and their description - the IC that is responsible for audio amp is a MAXIM's MAX4410 which is a stereo headphone driver. a quick look at its charasteristics and typical configuration and i understood that (assuming this is the IC that drives the internal speaker) the speaker should have one pin which is ground and the other goes to the amplified signal from the IC. neither one of the pins showed it has GND to it. so maybe there is a bad GND line to the connector.
2. regarding the backup battery issue i do not know what makes this problem.
I am sharing this info with you all with two ideas in mind :
1. to resolve my problem and know those devices hardware better.
2. because i am quite a while watching xda-developers and WIKI and i got the feeling that a lot of eforth is given to the software side of all those pdas (which is greate!!! keep going, this work helps lots of people and it shows al thos mega corps they are not the only ones), but the hardware is a bit forgotten and left behind. let me tell you this, there are many VERY simple mini projects i made useing electronics (i am an electronics engineer in my profession) that made my life easy . i am now investigating those instruments hardware as i have several ideas to develope useful accessories to my pda (like an external IR transciver to control IR devices like TV,DVD and to communicate with my laptop, and some other ideas) and i believe we can do the same info sharing as done on software side but on the hardware side.
I will thank any ideas, thoghts or commentsabout this matter. Yol.
Hi all,
As i started servicing all pdas for a couple of monthes (only as a hobby, i fix them for friends and relatives), i came across one BA that gave me some trouble.
i got it to replace its LCD that was broken as it was dropped and thats very simple to replace it, so far so good. now it has two main problems :
1. no sound from speaker (even when in speakerphone mode), but there is sound in the stereo earphones (i plugged to the connector by the sd card slot). - i can only assume that a bluetooth handsfree device it will also work.
2. although the backup battery is fully charged, if i remove the main battery even for a brief second, when turned on, the BA acts as if i made a hard reset.
as for solving the problems :
1. using a digital multimeter, i managed to track the conductivity from the internal speaker through its connector, flat ribbon to the connector which connects to the main pcb - so there is no contact problem from the speaker to the main pcb.
using the help from WIKI, i went to site that has the list of all components and their description - the IC that is responsible for audio amp is a MAXIM's MAX4410 which is a stereo headphone driver. a quick look at its charasteristics and typical configuration and i understood that (assuming this is the IC that drives the internal speaker) the speaker should have one pin which is ground and the other goes to the amplified signal from the IC. neither one of the pins showed it has GND to it. so maybe there is a bad GND line to the connector.
2. regarding the backup battery issue i do not know what makes this problem.
I am sharing this info with you all with two ideas in mind :
1. to resolve my problem and know those devices hardware better.
2. because i am quite a while watching xda-developers and WIKI and i got the feeling that a lot of eforth is given to the software side of all those pdas (which is greate!!! keep going, this work helps lots of people and it shows al thos mega corps they are not the only ones), but the hardware is a bit forgotten and left behind. let me tell you this, there are many VERY simple mini projects i made useing electronics (i am an electronics engineer in my profession) that made my life easy . i am now investigating those instruments hardware as i have several ideas to develope useful accessories to my pda (like an external IR transciver to control IR devices like TV,DVD and to communicate with my laptop, and some other ideas) and i believe we can do the same info sharing as done on software side but on the hardware side.
I will thank any ideas, thoghts or commentsabout this matter. Yol.
Hello,
Today I bought YC-A300 adaptor and soon after unpacking I realized that the device doesn't work properly. It occurs that 2.5 mm jack socket has two lines swapped - left audio with microphone input. Obviously the attached headset doesn't work as a result. Despite of this, other sockets work fine (i.e. ext USB for charging, ext USB for audio and 3.5mm jack audio). I would like to emphasize that the device is original HTC product. To give you better idea of this fault see connection diagram below:
Standard 2.5 / 3.5mm jack:
1. (tip of the plug) Left audio
2. 1st ring - right audio
3. 2nd ring - microphone
4. common ground
My 2.5mm jack is connected like this:
1. (tip) mic input
2. right audio
3. left audio
4. ground
Due to this problem I have two questions - am I alone with this or someone else also experienced such issue? And the second - has anyone tried to open the case of this adaptor? Obviously I have warranty for this, but my internet supplier wants to wash hands of it and local HTC service center needs ages to check if they can repair this (lol). Normally I could wait for weeks/months and argue firstly with my supplier and later with service center, but I bought this device for about 10 Euro (I live in Eastern Europe so OEM prices are lower) and I don't think it's worth the effort to fight with them. Since I'm an electronic engineer I could try to repair it myself, but firstly I would like to know if there are issues with opening the case (it seems possible to brake it during opening).
Thanks in advance for any replies.
My old mobo decode yourself(freezing, rebooting bootlooping etc) so I bought another one and after home disassembly/assembly I discover that right earphone is not working. So I checked the trs and the trrs - two types of headphones and I receive this same problem.
I'm wondering that it is a jack port or mobo? Can you give me the right answer?
Thank you! : )
Of course I teardown three times too.
Hello, I'm having some connection issues with the Headphone jack on my Redmi note 4 Global Version (snap), I had the phone for over a year but from 2 weeks ago the phone couldn't recognize the headphone if it's completely in the jack, but it does recognize it nearly at the bottom with some issues (such as missing a channel), but there's a gold spot like 1mm above the bottom where the sound works as normal, but it's not reliable because any movement would take the plug out of that gold spot.
I figured a replacement should work fine and at first I tried to solve this locally, I went into like 5 tech support stores but none of them had a replacement jack, however one of them said that this issue could instead be the logic board, they asked me to let my phone overnight to see if its the board or the piece, and then tell me if the repair is possible. Because everything pointed towards a issue with the piece, as the phone did had a point where it could recognize the headphone connected, I said fine and let it, the next morning they bailed out and said they couldn't fix it because it was an issue with the board, them they spouted something about it being a common issue with a bunch of Xiaomi models having that exact same issue and telling there's no point in changing the jack as it would keep failing.
Honestly I don't believe it, the phone have a year without issues and to me the behaviour in the headphone tells a failure in keeping the connection at the end of the plug.
My idea right now is to buy a jack myself and either follow this tutorial or bring it to a store to change it for me, I'm not familiarized with smartphones and have no experience in soldering, so maybe bring it to a store is a better idea, however i still need to ask, is there a chance it could be the logic board or it definitely is the jack? I should buy that piece from Aliexpress or search another source? That tutorial seems legit enough?
Thanks in advance for any help.
I have two Redmi Note 4s with headphone jack issues.
The headphone jacks don't last as long as other phone manufacturers. Also there appears to be issues with the printed circuit on the motherboard from the headphone jack to the rest of the circuit.
Replacing the headphone jack and adding extra wire from the headphone jack connectors to the associated components should fix the problem. If it doesn't then meh, you've done all you can!
Sent from my Redmi Note 4 using Tapatalk