e850 white screen - GSM-Forum

malta · 09-02-2005, 14:42

hi guys i have an e850 with the lcd all white. the problem is from the main board since i tested it on another working set.Can someone help me to find the fault

et.com · 09-15-2005, 21:57

have you tried to flash it?

Siemens man · 10-06-2005, 21:44

yes i have flashing phone, no result. problem same. turn on phone freez and white screen. help me
thank you

M@RTY · 10-14-2005, 21:50

Hi
For white screen pcb problem, check LCD EMI filters F200 to F206 measure the resistance value between Input pin and Output pin of EMI Filter.
The resistance is normaly approximate 100Ω between input and output,
and approximate 50K to 400KΩ between GND and other pins without power,
other values mean you need to replace the EMI filter.
B.R
M@RTY

Siemens man · 10-15-2005, 05:52

hi man
show us picture. and schematic
thank you

Quote:

Originally Posted by M@RTY

Hi
For white screen pcb problem, check LCD EMI filters F200 to F206 measure the resistance value between Input pin and Output pin of EMI Filter.
The resistance is normaly approximate 100Ω between input and output,
and approximate 50K to 400KΩ between GND and other pins without power,
other values mean you need to replace the EMI filter.
B.R
M@RTY

malta · 10-17-2005, 11:27

hi man i checked all the filters the resistance between input and output is 200 ohms which i think is good the resistance to ground is high as you said fault still not repiared any help

Tetouan Gsm · 01-30-2006, 19:56

Quote:

Originally Posted by M@RTY

Hi
For white screen pcb problem, check LCD EMI filters F200 to F206 measure the resistance value between Input pin and Output pin of EMI Filter.
The resistance is normaly approximate 100Ω between input and output,
and approximate 50K to 400KΩ between GND and other pins without power,
other values mean you need to replace the EMI filter.
B.R
M@RTY

i replace 200 with 206 but still same ERROR whit screen i think must change 200 with other good 200 but i have not one héhé..if i find it i teset it then post result if other solution am waiting for it ..

Tetouan Gsm · 01-31-2006, 20:46

not yet ...still no solution....???????

saso · 03-08-2006, 01:46

I mean filter is no problem
Check makvision cip (change) 99%

malta · 06-19-2006, 11:30

which one is the makviion ic?

09-02-2005, 14:42	#1 (permalink)
malta No Life Poster Join Date: Apr 2003 Location: pakistan Age: 44 Posts: 584 Member: 27289 Status: Offline Thanks Meter: 24	e850 white screen hi guys i have an e850 with the lcd all white. the problem is from the main board since i tested it on another working set.Can someone help me to find the fault

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09-15-2005, 21:57	#2 (permalink)
et.com Freak Poster Join Date: Aug 2004 Location: Coimbra - Portugal Age: 46 Posts: 372 Member: 77227 Status: Offline Thanks Meter: 26	have you tried to flash it?

10-06-2005, 21:44	#3 (permalink)
Siemens man No Life Poster Join Date: Apr 2001 Location: IN CASTLE Age: 46 Posts: 5,798 Member: 3925 Status: Offline Thanks Meter: 22	yes i have flashing phone, no result. problem same. turn on phone freez and white screen. help me thank you

10-17-2005, 11:27	#6 (permalink)
malta No Life Poster Join Date: Apr 2003 Location: pakistan Age: 44 Posts: 584 Member: 27289 Status: Offline Thanks Meter: 24	hi man i checked all the filters the resistance between input and output is 200 ohms which i think is good the resistance to ground is high as you said fault still not repiared any help

01-31-2006, 20:46	#8 (permalink)
Tetouan Gsm No Life Poster Join Date: Oct 2005 Location: T.E.T.O.U.A.N Posts: 1,154 Member: 190492 Status: Offline Sonork: 100.01010100 Thanks Meter: 190	not yet ...still no solution....???????

03-08-2006, 01:46	#9 (permalink)
saso Freak Poster Join Date: Jul 2001 Location: macedonija skopje Age: 55 Posts: 239 Member: 5292 Status: Offline Thanks Meter: 5	I mean filter is no problem Check makvision cip (change) 99%

06-19-2006, 11:30	#10 (permalink)
malta No Life Poster Join Date: Apr 2003 Location: pakistan Age: 44 Posts: 584 Member: 27289 Status: Offline Thanks Meter: 24	which one is the makviion ic?