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| Sony Ericsson Hardware Repair Post here your Hardware Repairing Hints or Problems with SonyEricsson and Sony Phones. |
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04-12-2007, 12:31
| #1 (permalink) |
| Freak Poster  Join Date: Apr 2007 Location: Croatia Age: 43
Posts: 327
Member: 485983 Status: Offline Thanks Meter: 25 | K750 no light I have k750 which had broken lcd...i put new lcd and now it has picture but no backlight...when i try to bend phone a little,light turns on.So the problem is that the motherboard has crack somewhere...i need shematics for k750 lcd backlight?! Please help!!! |
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| The Following User Says Thank You to goran124 For This Useful Post: |
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04-14-2007, 12:08
| #4 (permalink) |
| Freak Poster Join Date: Apr 2007 Location: Croatia Age: 43
Posts: 327
Member: 485983 Status: Offline Thanks Meter: 25 |  here is the solution[/quote]I connect it directly from one point to the other...but it does not solve the problem! Also i cant read some text on this pic you send...please help. Look at these pic... Thanx. |
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| The Following 7 Users Say Thank You to goran124 For This Useful Post: |
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04-15-2007, 16:05
| #6 (permalink) | |
| Freak Poster Join Date: Apr 2007 Location: Croatia Age: 43
Posts: 327
Member: 485983 Status: Offline Thanks Meter: 25 | Quote:
Thanx. | |
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| The Following User Says Thank You to goran124 For This Useful Post: |
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04-16-2007, 11:22
| #7 (permalink) |
| Freak Poster Join Date: Apr 2007 Location: Croatia Age: 43
Posts: 327
Member: 485983 Status: Offline Thanks Meter: 25 | I tryed but ikt does not work...i think im doing something wrong... ARAMHAMAT can you be more specific?What diode did you use...or...something?! Please help... THANX. |
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| The Following User Says Thank You to goran124 For This Useful Post: |
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04-19-2007, 19:02
| #10 (permalink) |
| Freak Poster  Join Date: Mar 2006 Location: In a house Age: 46
Posts: 466
Member: 249757 Status: Offline Sonork: 100.1601084 Thanks Meter: 117 | No lights My apologees to all for making such a bad quality pic but I was pressed for space. The green text in the pic says "Bridge out 2 LEDS on Keypad". (NOT: bridg with diod on keybad) The idea behind this was to redirect the keypad LEDS towards the LCD. You may notice the keypad lights dont work after you do the bridge, thats why you have to bridge out 2 keypad LEDS in order for this solution to work. I've posted a new pic. hopefully u guys will b able to read it better. Any questions contact me on MSN: [email protected]. (Do not e-mail to this address, its just for MSN) As for your problem my friend, If you have to twist the board in order for the lights to work then I think you might have a dry joint under your CPU. In this case I would write the phone off but there is one thing you can try which is VERY risky. (ie KILL your phone) Reheat your CPU (using hot air) just enough to make the solder melt. I've attempted this afew times and success rate is about 5%. The other 95% I've killed.  Good Luck, post reply |
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04-20-2007, 11:38
| #11 (permalink) |
| Freak Poster Join Date: Apr 2007 Location: Croatia Age: 43
Posts: 327
Member: 485983 Status: Offline Thanks Meter: 25 | I know that the problem is somewhere under the CPU...but phone works just fine except the lcd light... I dont understand why solution that you have send does not work...when i do that there is no light on the keyboard but also no light on LCD....  ...Just dont get it...it should work!!! Are you sure that youre pic is correct? |
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| The Following User Says Thank You to goran124 For This Useful Post: |
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04-20-2007, 16:17
| #12 (permalink) |
| Freak Poster Join Date: Mar 2006 Location: In a house Age: 46
Posts: 466
Member: 249757 Status: Offline Sonork: 100.1601084 Thanks Meter: 117 | Check your connectors... Did the lights work on the cracked LCD ??? But not the new one ??? Resolder the connectors... and make sure the pins are far out enuf to make contact And yes the pic does work... just not in your case... you have sum other problem |
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04-20-2007, 19:32
| #13 (permalink) |
| Freak Poster Join Date: Apr 2007 Location: Croatia Age: 43
Posts: 327
Member: 485983 Status: Offline Thanks Meter: 25 | I allready check that what you wrote...everything is ok... This is what i have done: I have connected LCD LED diodes directly to keypad Led diodes...but i have to remove two LCD led diodes...now it works with only one diode. Light is weaker than before,but it is the only thing i could do... Thanx for ur help enyway... |
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07-23-2007, 11:18
| #14 (permalink) |
| Freak Poster  Join Date: Feb 2005 Location: Poland
Posts: 483
Member: 118554 Status: Offline Thanks Meter: 74 | I don't understand I do like on picture, and now LCD is OK but i lost 6 diodes on keypad, is it normal? I find this picture, is this part isn't responsible for LCD light? |
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