IPhone 6 Plus dead after replacing touch ic - GSM-Forum

gily1 · 07-13-2018, 03:08

The phone was brought to shop with touch problem, and I replace u2402 and it started working fine but the customer brought the phone in two days time saying the touch is not working again so I replaced u2401 and now the phone is dead,,,,,help,,,,,

debeliamark · 07-13-2018, 05:20

Quote:

Originally Posted by gily1

The phone was brought to shop with touch problem, and I replace u2402 and it started working fine but the customer brought the phone in two days time saying the touch is not working again so I replaced u2401 and now the phone is dead,,,,,help,,,,,

You can measure everything arround and find it own, but you can wait - will make picture solution to our facebook page...

gily1 · 07-13-2018, 08:20

Thanks for your reply, but please try to upload it here because am not on your Facebook page.

gily1 · 07-13-2018, 13:03

Still waiting can somebody help me because the customer is on my neck

SAHILAKRAM · 07-13-2018, 15:33

Quote:

Originally Posted by gily1

The phone was brought to shop with touch problem, and I replace u2402 and it started working fine but the customer brought the phone in two days time saying the touch is not working again so I replaced u2401 and now the phone is dead,,,,,help,,,,,

try this line may be broke

gily1 · 07-13-2018, 16:35

Quote:

Originally Posted by SAHILAKRAM

try this line may be broke

Which line sir, can you show me the exact line that I should check. Thanks

abukuru · 07-14-2018, 08:08

How do u mean dead.....remove both touch ic and check if phone will power on

Sent from my iPhone using Tapatalk Pro

johnaccell · 07-14-2018, 09:21

replaced small touch i.c. also

gily1 · 07-14-2018, 22:19

Quote:

Originally Posted by abukuru

How do u mean dead.....remove both touch ic and check if phone will power on

Sent from my iPhone using Tapatalk Pro

Thanks for your reply I have done that but the phone is not powering on.

gily1 · 07-14-2018, 22:20

Quote:

Originally Posted by johnaccell

replaced small touch i.c. also

I changed both already

z@t@r@ · 07-15-2018, 07:55

that cause overheat. cover other parts properly before replacing touch ic

ernestoseimarfo · 07-16-2018, 13:59

ok, is there anything that you can help me with

christina_ · 07-17-2018, 17:27

Quote:

Originally Posted by gily1

The phone was brought to shop with touch problem, and I replace u2402 and it started working fine but the customer brought the phone in two days time saying the touch is not working again so I replaced u2401 and now the phone is dead,,,,,help,,,,,

What temperature and air flow you used? I guess CHInese air station?

I think you heat up too much the power IC near small glass IC.
Thats why phone is dead.

minho · 07-18-2018, 15:37

Quote:

Originally Posted by gily1

Still waiting can somebody help me because the customer is on my neck

You can't realistically expect an actual "answer" here. You have an indivdualized problem and all others can do is suggest things they have seen in the past. This might work but it doesn't help you learn.

So think back to how this started. You replaced Meson, the phone worked but two days later touch stopped again. You replaced Cumulus (why?) and then the phone died.

From a touch perspective, replacing Meson and solidfying the M1 pad with a micro-jumper is the world-wide recognized solution to this issue. If you didn't do that, then you didn't do a full repair in the first place.

You obviously either overheated something or caused a solder bridge or blew a part off the board. You have to start probing and inspecting to find the solution yourself so that you can learn from this.

The phone is not powering on so start probing the critical power rails to see if there are any shorts. Then check the main voltage rails the PMIC produces to see if something is wrong.

Check the Touch circuit. Look for partially dislodged or bridged passive components.

Report back and tell us what you have tried.

BigPunk · 07-22-2018, 18:19

Had similar problem once.
One dataline is probably shorted!
In my case it was U5302_RF. Check this small IC near the touch IC, reball it!

07-13-2018, 08:20	#3 (permalink)
gily1 Freak Poster Join Date: Jul 2006 Posts: 497 Member: 310423 Status: Offline Thanks Meter: 18	Thanks for your reply, but please try to upload it here because am not on your Facebook page.

07-13-2018, 13:03	#4 (permalink)
gily1 Freak Poster Join Date: Jul 2006 Posts: 497 Member: 310423 Status: Offline Thanks Meter: 18	Still waiting can somebody help me because the customer is on my neck

07-14-2018, 08:08	#7 (permalink)
abukuru Freak Poster Join Date: Dec 2015 Location: nigeria .benin Posts: 248 Member: 2495283 Status: Offline Sonork: gsmvilla.com Thanks Meter: 12	How do u mean dead.....remove both touch ic and check if phone will power on Sent from my iPhone using Tapatalk Pro

07-14-2018, 09:21	#8 (permalink)
johnaccell Freak Poster Join Date: Jan 2010 Location: cavite Posts: 177 Member: 1215525 Status: Offline Thanks Meter: 25	replaced small touch i.c. also

07-15-2018, 07:55	#11 (permalink)
z@t@r@ Junior Member Join Date: Jan 2014 Posts: 9 Member: 2102980 Status: Offline Thanks Meter: 0	that cause overheat. cover other parts properly before replacing touch ic

07-16-2018, 13:59	#12 (permalink)
ernestoseimarfo Junior Member Join Date: Dec 2016 Location: KUMASI-GHANA Age: 29 Posts: 15 Member: 2666437 Status: Offline Sonork: ernestoseimarfo Thanks Meter: 1	ok, is there anything that you can help me with

07-22-2018, 18:19	#15 (permalink)
BigPunk Junior Member Join Date: Sep 2015 Posts: 9 Member: 2456421 Status: Offline Thanks Meter: 1	Had similar problem once. One dataline is probably shorted! In my case it was U5302_RF. Check this small IC near the touch IC, reball it!