EF81 blank LCD, PCB HD problem - GSM-Forum

Porter · 05-24-2007, 17:12

hi.
have two EF81 wyth LCD problem - first, LCD work some times then go to gray. after some time agane work ok. Second - all time two LCD are grey.
I try use LCD modul and PCD from good phone and now I knou thet problem is in phone HD. LCD and flat cabels, conektors are ok.
thys two phones is totaly new, not used, no woterdamege, no drops.
I try rehot PCB but not helps.
Did somebody hav similar problem? Hove to fix it?
Thenks/

cooler_ua · 06-04-2007, 13:22

Hello!
Have about 30-40 phones with same problem

... can't solve it.
Please, help me!

TeutoCenter · 06-04-2007, 13:37

Hello !

There are many from this phones in the market !
I have 150 pieces of them !
All of them have blank display but works!
Sometimes i change a resistor and the display works !

The resistor is near the Battery Conector and is black!
On some Pieces this resistor is broken !

Sorry for my bad english !

WBR

adfree · 06-06-2007, 02:14

Please. Those of EF81 without IMEI are not frozen.

Can someone check if u can write into memory?

Simple Test. "Firmwareupdate"

:

Change SVN 58 into 59 or so... You need QXDM.

Memory Viewer (F4)

0x01BC3620 (adress varies, here from SVN 58 (IP16))

Code:

O'zapft is!000;EF81;58;KE_1433_17.0.16;P;
O'zapft is!000;EF81;59;KE_1433_17.0.16;P;

If it not Restart? Then Jackpot.

Example video attached. Thanx for trying.

migraneboy · 06-06-2007, 09:09

Hi! I also bought one of them as back-up

Try looking at the display from different angles, they DO display what they should but without backlights

Maybe you can tell us by referring to the pics in <http://www.ef81.com/Bilder.1472.0.ht..._lzgallery_pi1[showUid]=153> which resistor and how you changed it! This would be great and really of help!

Thankx a lot!

Quote:

Originally Posted by TeutoCenter

Sometimes i change a resistor and the display works !

The resistor is near the Battery Conector and is black!
On some Pieces this resistor is broken !

cooler_ua · 06-13-2007, 19:40

Hello!
Please, anybody, explayn me which resistor shoul be replaced?
Thank you!

Porter · 07-07-2007, 14:47

Quote:

Originally Posted by cooler_ua

Hello!
Please, anybody, explayn me which resistor shoul be replaced?
Thank you!

look for broken one. In My case theris no broken resistors neear bat conector.
Pleas, meet me on ICQ, we can talk on native lng.
Steel no solution

migraneboy · 07-13-2007, 11:11

I found out that sometimes a diode is even missing (in my case: V900 aka RB501V40 by ROHM Electronics).
These may be hard to find if you're not a phone manufacturer

Anyone having an idea where to get them in Germany?

05-24-2007, 17:12	#1 (permalink)
Porter No Life Poster Join Date: Jan 2003 Location: Ukraine. Lviv Age: 43 Posts: 1,781 Member: 19633 Status: Offline Thanks Meter: 13	EF81 blank LCD, PCB HD problem hi. have two EF81 wyth LCD problem - first, LCD work some times then go to gray. after some time agane work ok. Second - all time two LCD are grey. I try use LCD modul and PCD from good phone and now I knou thet problem is in phone HD. LCD and flat cabels, conektors are ok. thys two phones is totaly new, not used, no woterdamege, no drops. I try rehot PCB but not helps. Did somebody hav similar problem? Hove to fix it? Thenks/

06-04-2007, 13:22	#2 (permalink)
cooler_ua Junior Member Join Date: Dec 2006 Location: Ukraine, Dp. Posts: 21 Member: 411982 Status: Offline Thanks Meter: 1	EF81 LSD Problem Hello! Have about 30-40 phones with same problem ... can't solve it. Please, help me!

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06-04-2007, 13:37	#3 (permalink)
TeutoCenter Junior Member Join Date: Sep 2006 Location: Good old Germany Posts: 17 Member: 354600 Status: Offline Thanks Meter: 3	Hello ! There are many from this phones in the market ! I have 150 pieces of them ! All of them have blank display but works! Sometimes i change a resistor and the display works ! The resistor is near the Battery Conector and is black! On some Pieces this resistor is broken ! Sorry for my bad english ! WBR

06-13-2007, 19:40	#6 (permalink)
cooler_ua Junior Member Join Date: Dec 2006 Location: Ukraine, Dp. Posts: 21 Member: 411982 Status: Offline Thanks Meter: 1	Hello! Please, anybody, explayn me which resistor shoul be replaced? Thank you!

07-13-2007, 11:11	#8 (permalink)
migraneboy Junior Member Join Date: Jun 2007 Posts: 4 Member: 522886 Status: Offline Thanks Meter: 1	I found out that sometimes a diode is even missing (in my case: V900 aka RB501V40 by ROHM Electronics). These may be hard to find if you're not a phone manufacturer Anyone having an idea where to get them in Germany?