Hello,
Background:
I have a G-Tab that I've had for a while. I started noticing that the case would get really hot when charging. I removed the back cover, and felt the batteries and the felt fine to the touch. I then touched one of the integrated circuits (see images) and burned a nice rectangle into my finger tip. This chip and the other one of this type on the other side of the board get really hot. I haven't kept the tablet unplugged for several days now in fear this chip will "blow" and possibly take other components with it.
These chips are marked as:
7C9F 359
As shown in the second image. Both sides of the mainboard have this chip, and both get hot; as shown in the third image.
I also have a Cube U30GT2 that has a chip similar to this one, but marked as:
2015CS AD1364.
These seem to do something with voltage regulation. The ones on the G-Tab board are near to the full sized USB, and the Mini-USB plugs. The one on the U30GT2 is coming off the battery connection.
Now to my Question:
Can anyone help me identify these chips, and what they do; and, for bonus points, possibly tell me what can be done to fix this issue?
So far, I've checked for shorts between the pins on the chips on the G-Tab board; between the power plug and the ground plane and found none.
I have also looked for reference USB circuit designs to take a look at what those reference for these types of chips. I downloaded the Tegra 2 Technical Reference manual, but that only shows block diagrams of the USB interfaces.
Thanks in advance for any help provided.
Images:
Image 1:
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Image 2
Image 3
The charging circuit in these tabs is what is known as a linear regulator that will produce heat because it's dropping the difference between the charger voltage and battery voltage. Make sure that you don't use anything but a 9V charger.
Related
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Problems:
--Pin chassis, right, blocks the usb and HMDI, (with scissors and cut it to plug the usb). For there is no solution HMDI
--The keyboard does not work (The solution is to plug a hub)
Advantages:
--10$
at the end he finished in a forgotten drawer.
vurrut.
Thats a shame,
Still, thanks for the post. You saved me a tenner.
Rgds
Lok
annoying for this is exactly what i'd like!
Would this not work with the Vega in Host Mode?
I got one of these for my Advent Vega from Amazon for £16.99 delivered. It's OK. Regarding the comments made earlier:-
Problems:
"--Pin chassis, right, blocks the usb and HMDI, (with scissors and cut it to plug the usb). For there is no solution HMDI."
I guess u can cut the lug off but I didnt. Instead I bent back the right hand lug (which is designed to secure the tablet in the case) and put a little velcro on the back of the unit and the case to keep the Vega in place.
"--The keyboard does not work (The solution is to plug a hub)"
My keyboard works fine, although it took me some time to figure out why it didnt work from the off. Being a newbie to android, I didn't understand the usb host / slave stuff and there may have been another complication. I had to check the modaco forum to figure out what to do.
"Advantages:
--10$"
Damn. I paid nearly double that!
"at the end he finished in a forgotten drawer."
I like the case and use it now and then. However I primarily wanted the keyboard for use when travelling to enable me to edit word documents and the like (i.e using the Vega as a laptop/netbook substitute) which is when this particular case comes in handy. Mostly I use my Vega in pure tablet form so I normally keep it in a regular 10" protective sleeve.
vurrut.[/QUOTE]
Looks awesome
You just saved me £10, thanks!
Hi, a friend dropped a glass of beer on his galaxy i9100. Phone looks dead but when he give it to me i've tried another battery and the phone turns on with apparently no problem. So he bought another new original battery, put on and charge the phone. But, temperatures reach critical level and the phone stopped the charge. The temperature raise even without charge with battery in and phone on. So i disassembled and scan for damaged components or some trace of "beer" but the phone looks clear. I then sprayed with a product similar to wd40 (we call it crc in Italy, removes dirt and clear electric contacts) and wait for dry. But same problem. I turned on the phone partially disassembled and the heat is concentrated in the flex hook of the frontal buttons but probably the heat comes from the chip near that.
unfortunately there is no code on that chip so i hope you can understand wich i'm talking about. The only thing is that i don't really know if the heat is from that chip or the flex hook, i don't know how to test it. Looking at it there is no sign of damage. Any advice?
Hope you can understand the problem and apogologize for bad english
ps: with the crc the temperature focused on that chip, before that all the charging flex was over heating
Just post a picture.
Are you talking about the usb/mic board.
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this is the place where heat reach is max
no ideas? i cleaned the phone completely and nothing changed
All I can say is you look through previous posts about motherboards and see if anyone has an old board you could get.
I dont know how easy it would be to change that component your after.
I dunno about beer but mine (GT-I9100P) had a couple of vodka baths and it still works impeccably. (and when I say baths, I say full glass spilled on it)
I have had it for years, love it, I let my mom borrow and she tried to force the charger in upside down. Anyone have any info on replacing the usb/charger port? pics, advice, prayers, anything would be better than going in blind. I have not opened it yet, but is the footprint the same as a micro-USB (which I am kinda assuming) could I possible just replace the usb with micro-USB port?
thanks in advance
cheers,
disco
dock charging board replacement
disco_y2k said:
I have had it for years, love it, I let my mom borrow and she tried to force the charger in upside down. Anyone have any info on replacing the usb/charger port? pics, advice, prayers, anything would be better than going in blind. I have not opened it yet, but is the footprint the same as a micro-USB (which I am kinda assuming) could I possible just replace the usb with micro-USB port?
thanks in advance
cheers,
disco
Click to expand...
Click to collapse
1)buy parts from here:
parts4repair.com
2)select DOCK CHARGING BOARD
3)buy the right one ( one without 4g antena OR the one with if you have 4g tablet )
4)repacement is easy but repair with patience and slow.
5) have fun
for info : i have repaired once so i know it works
disco_y2k said:
I have not opened it yet, but is the footprint the same as a micro-USB (which I am kinda assuming) could I possible just replace the usb with micro-USB port?
Click to expand...
Click to collapse
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I've indicated which three connections that you will have to unplug -- in addition to unscrewing the charging board. The only two tools that you should need are a pry tool (a knife will probably do) and a Philips or Frearson screwdriver.
i had the same idea of doing that, but as far as i know that is impossible
Hey guys, long time reader, first time poster here (and it's a long one too).
My OnePlus X is my daily driver and I was planning on using it for some more years if this is fixable
Recently the USB port started to fail, so I decided to replace the part. A little setback was that i also had to replace the GSM antenna cable, which I had damaged during disassembly. So far so good, the phone is now charging again and reception and mobile data are working fine.
However, ever since the repair my Wifi reception has gone to ****, it is now so bad that it's pretty much unusable even when right next to the router. I've come to the conclusion that this is not a problem with the antenna cable replacement, as removing this cable only kills cell reception, wifi is unchanged. You can see the cable i'm talking about running into the long side of the frame in the bottom of this
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, with the golden connector on the lower edge of the motherboard (the other side connects to the USB flex cable, under the metal housing on the right). I believe the Wifi chipset itself is contained within the small housing in the upper middle of the board, with the + sign.
So now on to my question:
Does anyone know where exactly the wifi antenna on this phone is located? I'm assuming that it is being routed into the plastic/metal housing cover that's over the mainboard. I've made sure that none of the pins on the motherboard that connect to the housing cover are missing/bent or corroded. I've angled them up a little bit and cleaned them with alcohol to ensure a good contact.
But still, no wifi. Is it possible that the wifi chip itself got damaged in the repair and is there any way to find out?
Hopefully someone here knows something useful, I would be eternally grateful
Did you ever find a fix? I am having similar problems for one plus 3t
No, zero news on that front. I did some superficial research but was unable to pin-point the fault. I had to replace the phone, sadly.
So, as the title suggests, I have got my hands on a Samsung Galaxy A10 (SM-A105F) which was stashed away because i was supposedly dead. The phone is able to boot up (the vibrator works during start-up), the charging seems ok (I hear a charging tone when plugged in) and a port is created when connected to a computer. Someone may have set an alarm which went off at effing 5am further proving that the handset is indeed working fine. However, the display doesn't turn on even after letting it charge for some time and I wasn't able to see any graphics either so I think that the issue is with the display itself.
I dont have a spare phone or LCD to test whether the problem lies with the screen or the display circuit. I found some reference info and tested the LCD connector for a secure connection and then checked for voltage drop on the pins. I have attached an image of the same; the values in white boxes are from the reference info while the black boxes denote actual values.
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I continued further and tried hot-testing the phone and measured the voltages on the components according to the Samsung service manual i.e. LED_A_20V, VSN_5P5, VSN_-5P5 and VDD_LCD_1P8
All of them were out of range.
The service manual says to reball/replace an IC (U7006) but I believe the display IC (U6009) and/or related components to be the cause of the problem. Need some inputs before I proceed as I would like to rule out any other possibilities.
P.s- This repair is a challenge thrown to me by my cousin who saw me trying to repair my Samsung Galaxy Grand Neo!
Admin/mods, can you please move this thread to Device Repair?
Got this to work yesterday. An acquaintance from an online group on Telegram suggested I reflow or replace the backlight IC which seems to be the culprit.
I reflowed the chip and voila! the display came on without any problems. The touch works fine too. So, it was a good challenge as I learnt many new things including handskills when using a reworking gun or a microsolder pen all of which goes towards a worthy experience. The look on my cousin's face was priceless too!!
Onto the next one