Dead GD87 - GSM-Forum

SiRoYa · 07-21-2003, 16:18

i have totaly dead gd87

any solution to repair?

adv · 07-21-2003, 16:40

sw or hw ?

TriMesh · 07-22-2003, 04:09

Quote:

Originally posted by siroya
i have totaly dead gd87

any solution to repair?

How did it become dead? During normal use? During a reflash?

SiRoYa · 07-22-2003, 08:44

@adv
software///

i put it out during flash erase :P

Mobile Lab · 07-22-2003, 09:14

i have dead gd 88 ..and its not going to flash .i just checking my cable with one working gd 87 its start flashing and now my gd 87 also dead

...and its not going to flash ..

befor when it working i just tuch downlaoding and its going to flash....and now i try every thing but its not going to flash ..

now my both phones .. gd 88 gd 87 dead ..any bady have solution how its going to flash .........

Sun · 07-22-2003, 11:13

Quote:

Originally posted by Mobile Lab
i have dead gd 88 ..and its not going to flash .i just checking my cable with one working gd 87 its start flashing and now my gd 87 also dead ...and its not going to flash ..

befor when it working i just tuch downlaoding and its going to flash....and now i try every thing but its not going to flash ..

now my both phones .. gd 88 gd 87 dead ..any bady have solution how its going to flash .........

I'm share the sorrow with u, i have one dead too and i hope everybody know pls tell me

Best Regads

senis_r · 07-22-2003, 12:24

read old post

TriMesh · 07-22-2003, 12:59

If you have lost power to the phone after erase has started, but before the BOOT section of the program has been reloaded, then there is no solution possible through software. Unlike some other phones (Nokia, Siemens, etc.) the bootloader isn't in permanent ROM - it's in the Flash along with the rest of the program.

If the phone will not communicate with WinMoDo, then about the only thing you can do is to unsolder the Flash from the circuit board and reprogram the first 64K of it with a valid boot loader.

Note that the GD87 flash is a BGA device, so this requires BGA soldering /reconditioning equipment and a programmer that can handle BGA devices.

It might also be possible to reflash the bootstrap using JTAG (you can do this on the GD92), but I have been unable to locate the JTAG test points, so I can't be sure it will work.

Bomber · 08-25-2003, 01:15

interresting info's,i just killed one gd87 because of external power broken during erase process

i know some one who have right equipement to desolder flash chips and reprogramming them,

if i'll give him a gd87a29.rel flash file, will it make my phone alive ?

TriMesh · 08-26-2003, 08:42

Don't try and program the chip directly with the .rel file - it won't work. First of all, make a binary file containing the bootstrap code - take offsets 0x0000004-0x0020003 from the .rel file (I.E. discard the first 4 bytes, then take the next 128K). Program this to the flash at addresses 0x0000000-0x0001ffff. You should now have a functioning boot in the phone, and it can be reflashed via WinMoDo as usual.

Although it's tempting to try and reflash the entire chip it's probably a bad idea, since there is a lot more data stored in the flash than just the program, and damaging this tends to stop the phone from working.

lolotuit · 08-26-2003, 17:44

Nice answer, can someone tell where i can see a picture of the GD87 PCB in order to localize the chip to de-solder and program again.

Thanks

lolotuit

TriMesh · 08-27-2003, 13:17

I don't know where there's a photo, but if you look at the main PCB with the accessory connector at the bottom and the keyboard away from you, the flash is the NEC device in the lower left corner of the PCB.

lolotuit · 08-27-2003, 13:48

Thanks,

Any information of this NEC chip. Eprom, Flash Eprom, Datasheet

serial id.

What type of programer do i need to use.

Thanks

lolotuit

ihsanali · 09-01-2003, 08:41

hi all friends
me too have a gd87 dead in flahsing. it shows only red light when connect to charger. first i changed the mad ic i mean system ic. it did not get me any result same only red light with charger. then i changed the flash chip and again same result i mean not accept boot. so i am 1000% sure that changing mad or flash chip is not the solution for this problem and dont try to do it. thanks

TriMesh · 09-01-2003, 10:02

Did you program the boot into the replacement flash first?

07-21-2003, 16:18	#1 (permalink)
SiRoYa No Life Poster Join Date: Oct 2002 Age: 39 Posts: 8,376 Member: 16107 Status: Offline Sonork: 100.58402 Thanks Meter: 26,411	Dead GD87 i have totaly dead gd87 any solution to repair?

07-22-2003, 09:14	#5 (permalink)
Mobile Lab No Life Poster Join Date: Nov 2002 Location: D U B A I Age: 45 Posts: 1,929 Member: 17651 Status: Offline Sonork: 100.81230 Thanks Meter: 318	same probelm here .. i have dead gd 88 ..and its not going to flash .i just checking my cable with one working gd 87 its start flashing and now my gd 87 also dead ...and its not going to flash .. befor when it working i just tuch downlaoding and its going to flash....and now i try every thing but its not going to flash .. now my both phones .. gd 88 gd 87 dead ..any bady have solution how its going to flash .........

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07-21-2003, 16:40	#2 (permalink)
adv Freak Poster Join Date: Sep 2002 Location: somewhere... Posts: 419 Member: 15165 Status: Offline Thanks Meter: 0	sw or hw ?

07-22-2003, 08:44	#4 (permalink)
SiRoYa No Life Poster Join Date: Oct 2002 Age: 39 Posts: 8,376 Member: 16107 Status: Offline Sonork: 100.58402 Thanks Meter: 26,411	@adv software/// i put it out during flash erase :P

07-22-2003, 12:24	#7 (permalink)
senis_r Junior Member Join Date: Mar 2002 Location: lithuanian Age: 48 Posts: 33 Member: 10198 Status: Offline Thanks Meter: 0	read old post

07-22-2003, 12:59	#8 (permalink)
TriMesh Freak Poster Join Date: Dec 2001 Location: Shenzhen, China Posts: 327 Member: 7911 Status: Offline Thanks Meter: 7	If you have lost power to the phone after erase has started, but before the BOOT section of the program has been reloaded, then there is no solution possible through software. Unlike some other phones (Nokia, Siemens, etc.) the bootloader isn't in permanent ROM - it's in the Flash along with the rest of the program. If the phone will not communicate with WinMoDo, then about the only thing you can do is to unsolder the Flash from the circuit board and reprogram the first 64K of it with a valid boot loader. Note that the GD87 flash is a BGA device, so this requires BGA soldering /reconditioning equipment and a programmer that can handle BGA devices. It might also be possible to reflash the bootstrap using JTAG (you can do this on the GD92), but I have been unable to locate the JTAG test points, so I can't be sure it will work.

08-25-2003, 01:15	#9 (permalink)
Bomber No Life Poster Join Date: Jul 2000 Location: hiroshima Age: 51 Posts: 878 Member: 1756 Status: Offline Thanks Meter: 9	interresting info's,i just killed one gd87 because of external power broken during erase process i know some one who have right equipement to desolder flash chips and reprogramming them, if i'll give him a gd87a29.rel flash file, will it make my phone alive ?

08-26-2003, 08:42	#10 (permalink)
TriMesh Freak Poster Join Date: Dec 2001 Location: Shenzhen, China Posts: 327 Member: 7911 Status: Offline Thanks Meter: 7	Don't try and program the chip directly with the .rel file - it won't work. First of all, make a binary file containing the bootstrap code - take offsets 0x0000004-0x0020003 from the .rel file (I.E. discard the first 4 bytes, then take the next 128K). Program this to the flash at addresses 0x0000000-0x0001ffff. You should now have a functioning boot in the phone, and it can be reflashed via WinMoDo as usual. Although it's tempting to try and reflash the entire chip it's probably a bad idea, since there is a lot more data stored in the flash than just the program, and damaging this tends to stop the phone from working.

08-26-2003, 17:44	#11 (permalink)
lolotuit Junior Member Join Date: Jul 2003 Age: 49 Posts: 10 Member: 35195 Status: Offline Thanks Meter: 0	Nice answer, can someone tell where i can see a picture of the GD87 PCB in order to localize the chip to de-solder and program again. Thanks lolotuit

08-27-2003, 13:17	#12 (permalink)
TriMesh Freak Poster Join Date: Dec 2001 Location: Shenzhen, China Posts: 327 Member: 7911 Status: Offline Thanks Meter: 7	I don't know where there's a photo, but if you look at the main PCB with the accessory connector at the bottom and the keyboard away from you, the flash is the NEC device in the lower left corner of the PCB.

08-27-2003, 13:48	#13 (permalink)
lolotuit Junior Member Join Date: Jul 2003 Age: 49 Posts: 10 Member: 35195 Status: Offline Thanks Meter: 0	Thanks, Any information of this NEC chip. Eprom, Flash Eprom, Datasheet serial id. What type of programer do i need to use. Thanks lolotuit

09-01-2003, 08:41	#14 (permalink)
ihsanali No Life Poster Join Date: Mar 2003 Location: pakistan Age: 45 Posts: 717 Member: 23939 Status: Offline Thanks Meter: 14	hi all friends me too have a gd87 dead in flahsing. it shows only red light when connect to charger. first i changed the mad ic i mean system ic. it did not get me any result same only red light with charger. then i changed the flash chip and again same result i mean not accept boot. so i am 1000% sure that changing mad or flash chip is not the solution for this problem and dont try to do it. thanks

09-01-2003, 10:02	#15 (permalink)
TriMesh Freak Poster Join Date: Dec 2001 Location: Shenzhen, China Posts: 327 Member: 7911 Status: Offline Thanks Meter: 7	Did you program the boot into the replacement flash first?