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1200 no backlight

Disply light

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Hi, this problem occur because the led of the keypad or the socket of the LCD has frequently short circuit.So, as far as I know please check that keypad led is OK or not.If not Ok then you need to change the damaged led.LCD light and Keypad light are connecting parallel, so if the key light doesn't comes the LCD light will remain the same.If you think that you can repair it by yourself please leave a comment so that I will instruct how to do.Thank you

Posted on May 05, 2013

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Posted on Jan 02, 2017

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1 Answer

Lcd light problm disply


Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
In some models of LCD displays; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should be troubleshooted. Contact any service technician. The circuit will differ with models and versions.
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.

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This might be a sign of a faulty LCD cable or screen inverter board.
The LCD cable transfers data signal from the motherboard & video card to the LCD screen. It also supplies high voltage DC power to the screen inverter board. The screen inverter board works as a power supply for the backlight lamp mounted inside the LCD screen. It converts low voltage DC power to high voltage AC power needed for the backlight lamp.

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the ribbon cable from the screen to the board might need to be reseated or the lock on the ribbon might of broke...

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The display circuit is broken even if the LCD-panel seems to be ok. the only circuit working in the display is the one for the backlight.
This is a very common Nokia display problem.
Only solution is to change the display.
You need a T-6 Torx skrewdriver to do the job.
You can find displays for fair prise at:
www.mytrendyphone.com

This is your solution! Please vote!

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Use your main board, swap another phone step by step find down problem.could be keypad or display faulty or cable conector,but my expet display faulty.

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no.. its the backlight or the inverter.. both located at bottom edge of lcd under plastics.. the backlight is a mini fluorecent light tube in the lcd dotn try to fix it its hard. the inverter u can fix . inverter is easier and its 25$ in ebay

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It may be a bad fuse inside or it could be blown circuit protection on the control board caused by a power surge. The former you or a friend can fix, the latter we repair nationwide for only $39.95. We have free service manuals available for download on our site for the Sharp R370 and R630 models which are similar types. If you or a friend decide to work on it, we have *critical* safety and disassembly info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk

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