7210 very poor contrast, Please help!!! - GSM-Forum

KUBAT1 · 04-30-2005, 14:41

7210 water demaged, I repaired the phone but now the display contarst is very poor.Hard to see texts. I changed CPU,UEM, LCD no result.LCD connector is OK 100%. I lived this problem many times on 7210,6610 and 6820. Isn't tehre any soft to increase Contrast manually like DCT3. I uploaded all software works like flash, PM full erase etc...

Plase help!

Masta G. · 04-30-2005, 18:29

hi man! check the resistors on the picture:

mohammed · 04-30-2005, 22:13

brother

did u try MANUALLY to increase contrast?

KUBAT1 · 05-06-2005, 09:13

Quote:

Originally Posted by Masta G.

hi man! check the resistors on the picture:

I checked these resistors of course, changed with good resisitors, the problem is same..There should be something else..
Regards

Masta G. · 05-06-2005, 13:41

1) sw problem (write last sw and good PM)
2) lcd (try another type)
3) connector
4) resistors
5) UPP
6) lines
check one more time and replace if possible, it must solve the problem

KUBAT1 · 05-12-2005, 09:39

Quote:

Originally Posted by Masta G.

1) sw problem (write last sw and good PM)
2) lcd (try another type)
3) connector
4) resistors
5) UPP
6) lines
check one more time and replace if possible, it must solve the problem

All changed, from a phone which is working good, interesting the same poor contrast, hard to see.

pali · 05-14-2005, 23:38

i have same problem with 6610 very poor contrast.
did u fixed it ?

Pali

Masta G. · 05-15-2005, 16:44

Quote:

Originally Posted by KUBAT1

All changed, from a phone which is working good, interesting the same poor contrast, hard to see.

well, did you check that "working good" phone has another type of lcd (there are at least 3 types of lcd - marked with green, red or blue colour)?

KUBAT1 · 05-16-2005, 08:07

Quote:

Originally Posted by Masta G.

well, did you check that "working good" phone has another type of lcd (there are at least 3 types of lcd - marked with green, red or blue colour)?

The reason is not LCD I am sure, I used tons of LCDs. And as I know 6610 and 7210 can use all types of LCDs.
Regards anyway....

eblaster101 · 05-17-2005, 13:56

did you check the connection lines between screen and board, clean it with methonal

pali · 05-21-2005, 22:42

conection is OK .
LCD is ok too.. (tried about 10 different lcd )
UEm ic new.
UPP is also changed.. still same.
flashes with latest fw..

Pali

Masta G. · 05-22-2005, 12:52

did you check signals VI0 and VFLASH1?
VI0 (1st pin of lcd connector) must be 1,8V
VFLASH1 (6th pin of lcd connector) must be 2,8V

KUBAT1 · 05-23-2005, 07:43

Quote:

Originally Posted by Masta G.

did you check signals VI0 and VFLASH1?
VI0 (1st pin of lcd connector) must be 1,8V
VFLASH1 (6th pin of lcd connector) must be 2,8V

for my 7210 VIO=1.8v and VFLASH1=2.8 v I checked them first, but still very poor contrast. This is a very interesting problem. especially on water demaged phones. I saw many and could not fix. maybe under CPU there is some hole demaging.

Rgards

Masta G. · 05-23-2005, 07:52

mmm interesting... could you send me the board? maybe i'll fix the prblm

KUBAT1 · 06-02-2005, 18:51

how to send you the board brother, I have seen 10 phones with this problem..
in LOCALE MODE contrast excelent...

04-30-2005, 14:41	#1 (permalink)
KUBAT1 Registered User Join Date: Feb 2004 Location: MERSIN, TURKEY Posts: 1,260 Member: 55026 Status: Offline Thanks Meter: 53	7210 very poor contrast, Please help!!! 7210 water demaged, I repaired the phone but now the display contarst is very poor.Hard to see texts. I changed CPU,UEM, LCD no result.LCD connector is OK 100%. I lived this problem many times on 7210,6610 and 6820. Isn't tehre any soft to increase Contrast manually like DCT3. I uploaded all software works like flash, PM full erase etc... Plase help!

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04-30-2005, 22:13	#3 (permalink)
mohammed No Life Poster Join Date: Sep 2002 Location: max232 chip Posts: 690 Member: 16036 Status: Offline Thanks Meter: 5	brother did u try MANUALLY to increase contrast?

05-06-2005, 13:41	#5 (permalink)
Masta G. Freak Poster Join Date: Dec 2003 Location: Russia, Yaroslavl Age: 43 Posts: 149 Member: 46415 Status: Offline Thanks Meter: 16	1) sw problem (write last sw and good PM) 2) lcd (try another type) 3) connector 4) resistors 5) UPP 6) lines check one more time and replace if possible, it must solve the problem

05-14-2005, 23:38	#7 (permalink)
pali No Life Poster Join Date: Nov 2001 Location: Slovakia Posts: 1,005 Member: 7586 Status: Offline Thanks Meter: 11	i have same problem with 6610 very poor contrast. did u fixed it ? Pali

05-17-2005, 13:56	#10 (permalink)
eblaster101 Freak Poster Join Date: Apr 2005 Age: 42 Posts: 312 Member: 136598 Status: Offline Thanks Meter: 3	did you check the connection lines between screen and board, clean it with methonal

05-21-2005, 22:42	#11 (permalink)
pali No Life Poster Join Date: Nov 2001 Location: Slovakia Posts: 1,005 Member: 7586 Status: Offline Thanks Meter: 11	conection is OK . LCD is ok too.. (tried about 10 different lcd ) UEm ic new. UPP is also changed.. still same. flashes with latest fw.. Pali

05-22-2005, 12:52	#12 (permalink)
Masta G. Freak Poster Join Date: Dec 2003 Location: Russia, Yaroslavl Age: 43 Posts: 149 Member: 46415 Status: Offline Thanks Meter: 16	did you check signals VI0 and VFLASH1? VI0 (1st pin of lcd connector) must be 1,8V VFLASH1 (6th pin of lcd connector) must be 2,8V

05-23-2005, 07:52	#14 (permalink)
Masta G. Freak Poster Join Date: Dec 2003 Location: Russia, Yaroslavl Age: 43 Posts: 149 Member: 46415 Status: Offline Thanks Meter: 16	mmm interesting... could you send me the board? maybe i'll fix the prblm

06-02-2005, 18:51	#15 (permalink)
KUBAT1 Registered User Join Date: Feb 2004 Location: MERSIN, TURKEY Posts: 1,260 Member: 55026 Status: Offline Thanks Meter: 53	how to send you the board brother, I have seen 10 phones with this problem.. in LOCALE MODE contrast excelent...