Help!!! Problem with motorola V3688/3690 - GSM-Forum

toldien · 12-05-2001, 00:09

On my 2 motorolas v3690 and v3688, I broke the displays... so I decided to buy a new ones... I dissassembled correctly the phone... quit the flex cable and etc... (disconnected the ground on the screen... after that, I put the new displays... soldered the display GND and so... but with surprise, THERE'S NOTHING ON THE SCREEN!!! nothing, I checked the connectors, but nothing... and no beeps, no speaker, no led ignition and no display. But I know the phone works, because the main pcb works, if I use a hands free works... Can anyone help me??? It's strange to crash the 2 phones at the same time/way... so please help me.

Many thanks in advance and best regards,

Toldien

D-Brain · 12-05-2001, 08:33

You can try to clean and/or resolder the Flat-cable connector on the PCB , or if you can.. try another LCD , maybe you have 2 defective LCD?!?

sawa · 12-05-2001, 23:21

did you bye..corect version of display...there is many versions of displays..and flats...look at the back of flats...you are going to see a diference <img src="smile.gif" border="0"> )))

melsoft · 05-08-2003, 15:52

take very care on dissasembly ..there are some resistors in front of plastic closers of the case, so if u use on opening some inadecvate tool u could remove them , so ur phone doesn't start anymore....check them with strong light and strong glasses. Try 2 resolder them again.

SVH · 05-16-2003, 00:31

i can tell you interest info about cables
i had similar situation: i got V3688 with bad cable so i decided to change not full display but just cable
i bought cable, soldered correctly and tried to power on but on display was nothing and display ic was little hot
i compared 2 cables and found that position for 1 capacitor and 1 resistor(0 Ohm) are differend
so look carrefully on your new cable, compare with old and go to play new game "Find differences"
i sure you find them
b.r.

tob · 08-31-2003, 19:53

1. Put display connector deeper
2. Check R4 and C10, if they changed - nothing on display
3. R1 - contrast (my 270k)

Porter · 08-31-2003, 21:29

Better to by flat cabel + lcd, because exist feu wersion LCD and flex cabel... theyu is not compatible, so better do as I say...

12-05-2001, 00:09	#1 (permalink)
toldien Freak Poster Join Date: Sep 2001 Location: Spain Posts: 109 Member: 6263 Status: Offline Thanks: 7 Thanked 0 Times in 0 Posts	Help!!! Problem with motorola V3688/3690 On my 2 motorolas v3690 and v3688, I broke the displays... so I decided to buy a new ones... I dissassembled correctly the phone... quit the flex cable and etc... (disconnected the ground on the screen... after that, I put the new displays... soldered the display GND and so... but with surprise, THERE'S NOTHING ON THE SCREEN!!! nothing, I checked the connectors, but nothing... and no beeps, no speaker, no led ignition and no display. But I know the phone works, because the main pcb works, if I use a hands free works... Can anyone help me??? It's strange to crash the 2 phones at the same time/way... so please help me. Many thanks in advance and best regards, Toldien

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12-05-2001, 08:33	#2 (permalink)
D-Brain Freak Poster Join Date: Nov 2001 Location: Italy Posts: 184 Member: 7301 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	You can try to clean and/or resolder the Flat-cable connector on the PCB , or if you can.. try another LCD , maybe you have 2 defective LCD?!?

12-05-2001, 23:21	#3 (permalink)
sawa Freak Poster Join Date: Oct 2001 Location: NIS Posts: 251 Member: 6781 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	did you bye..corect version of display...there is many versions of displays..and flats...look at the back of flats...you are going to see a diference <img src="smile.gif" border="0"> )))

05-08-2003, 15:52	#4 (permalink)
melsoft Registered User Join Date: Apr 2002 Location: in a cozy place Posts: 384 Member: 10672 Status: Offline Thanks: 14 Thanked 8 Times in 6 Posts	take very care on dissasembly ..there are some resistors in front of plastic closers of the case, so if u use on opening some inadecvate tool u could remove them , so ur phone doesn't start anymore....check them with strong light and strong glasses. Try 2 resolder them again.

05-16-2003, 00:31	#5 (permalink)
SVH No Life Poster Join Date: Mar 2002 Location: Europe, Lemberstadt Age: 42 Posts: 1,502 Member: 9889 Status: Offline Thanks: 23 Thanked 19 Times in 14 Posts	i can tell you interest info about cables i had similar situation: i got V3688 with bad cable so i decided to change not full display but just cable i bought cable, soldered correctly and tried to power on but on display was nothing and display ic was little hot i compared 2 cables and found that position for 1 capacitor and 1 resistor(0 Ohm) are differend so look carrefully on your new cable, compare with old and go to play new game "Find differences" i sure you find them b.r.

08-31-2003, 19:53	#6 (permalink)
tob Freak Poster Join Date: Dec 2002 Location: Ukraine Age: 34 Posts: 172 Member: 19068 Status: Offline Thanks: 6 Thanked 1 Time in 1 Post	1. Put display connector deeper 2. Check R4 and C10, if they changed - nothing on display 3. R1 - contrast (my 270k)

08-31-2003, 21:29	#7 (permalink)
Porter No Life Poster Join Date: Jan 2003 Location: Ukraine. Lviv Posts: 1,776 Member: 19633 Status: Offline Thanks: 21 Thanked 12 Times in 7 Posts	Better to by flat cabel + lcd, because exist feu wersion LCD and flex cabel... theyu is not compatible, so better do as I say...