Blown L9000 for LCD power connector

Question

iMac Intel 27" EMC 2429

Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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Pushpinder @pbsingh

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发帖于: 2018年6月5日

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Blown L9000 for LCD power connector

I have 27" iMac mid 2011 which required LCD replacement. I bought another dead iMac to pull lcd and Led inverter board. As soon as I plugged it and blew L9000. iMac stills boots with chime but no display(not surprised) with fans running full speed. Closely inspecting i saw broken data cable for new lcd. So my questions are:

1)Could the bad data connector have caused this?

2) Can bad LCD or LED backlit be cause of this, if yes how to test it?

3) Can I take this connector and take input from somewhere else example solder wires to to 12 v supply from power supply or use other backlight power?

6) Is there any schematic available for the graphics card connector and lcd connectors?

Picture of logic board, connector and potential connector attached. The one in picture is in bad shape, other logic board has only L9000 burned out. I will post pictures after cleaning it up.

UPDATED PICTURE

POTENTIAL DONOR

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is this possible to fix, i have the same burn on my logic board

由 Red Firth 完成的 2019年11月30日

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oldturkey03 @oldturkey03

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发帖于: 2018年6月11日

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@pbsingh yes schematics are available since it seems like your board is a 820-2828. L9000 is a 250 ohm ferrite bead and it sits on the 12V supply line to the LCD. If you have a donor board, replace the connector. You also want to take a closer looks around C8655 and C8654 there seems to be something going on as well. Check the color of the testpoint. Note that it appears discolored as well. So, getting power from somewhere else may not be your solution. Replace the connector/cable and component and then carefully check your board.

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Please see the picture of other board in original post. This one looks in better condition. I was thinking of getting this one fixed. Does getting power elsewhere for this board works?

由 Pushpinder 完成的 2018年6月12日

Is L4300 similar to L9000 in terms of specs. Is it is same then I can use it as donor from one of the boards.

由 Pushpinder 完成的 2018年6月12日

yes, L4300 is the same. Your picture of the "donor board is not all telling. Trying to determine why you would want to pull power to the LCD from anywhere else than what the board is designed for. Clean your board, check the connector, replace the cable and replace the component. Then check your board etc.

由 oldturkey03 完成的 2018年6月12日

Only reason is that I am pretty bad at soldering boards but pretty good at soldering cables (typical noobie).

i have checked the LCD data port and power port(just darkened), I have new data cable for LCD.

I will test my luck and solder L4300 at L9000 and hope for best.

由 Pushpinder 完成的 2018年6月12日

So how did it go? :)

由 Sebastian Aldrin 完成的 2019年2月9日

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is this possible to fix, i have the same burn on my logic board — Red Firth
Please see the picture of other board in original post. This one looks in better condition. I was thinking of getting this one fixed. Does getting power elsewhere for this board works? — Pushpinder
Is L4300 similar to L9000 in terms of specs. Is it is same then I can use it as donor from one of the boards. — Pushpinder
yes, L4300 is the same. Your picture of the "donor board is not all telling. Trying to determine why you would want to pull power to the LCD from anywhere else than what the board is designed for. Clean your board, check the connector, replace the cable and replace the component. Then check your board etc. — oldturkey03
Only reason is that I am pretty bad at soldering boards but pretty good at soldering cables (typical noobie).

i have checked the LCD data port and power port(just darkened), I have new data cable for LCD.

I will test my luck and solder L4300 at L9000 and hope for best. — Pushpinder