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Repair guides for displays (or monitors) for computers or other devices with video output.

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Dell C7017T 70" touch needs new backlight what size LED do I need?

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I can find Dell's teardown instructions:
Dell C7017T Monitor Teardown Instructions
And the simplified service manual:
Dell C7017T Monitor Simplified Service Manual

But I would like to by the replacement LCD bulbs ahead of time and am not finding the specs on the blubs.

Anyone familiar with this display or large Dell displays in general?

Any advice would help, but specifically hoping to get a couple of educated guesses on the power and size of the backlights.

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I spoke to a local tech repair place who has suggested that the gradual decline of the backlights suggests that a failing capacitor is likely my culprit. Regardless, I also have a path to information through Dell support, assuming the Support ID sticker is still on the machine somewhere.

Assuming that pans out, I will update my post here with part numbers from Dell support. Thx to Bothell 1 Hour Repair for some diagnostics.

da

Dell is no help now that the service window has expired. I am still looking for more information on the LCD panel following up on @jayeff's wisdom:

--> Sharp brand LQ695D3L02

I have opened the device and opened up the power supply hoping to find an obviously bad capacitor. I was not so lucky, but I now have a part number for the power-board:

--> PN: 790LR1400100R00 HBN10AA005AK 1726 Rev:A00

--> 491A011T1400H06

I haven't been able to find any additional details on this part, but again posting here to consolidate information.

Anyone know how I can test the power-board in isolation?

da

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Hi @gusreiber,

Usually there's a part number on the LED strip that you can use to search online for. Normally individual LEDs aren't replaced, the whole strip is and if you're going to replace one strip then perhaps it is better to replace the lot as some LEDs have already failed and the others may not be that far away from doing the same.

Replacing individual LEDs on a strip may be problematic as you would need to know the exact specifications of the LED itself so that when you replace it (them?) there's no noticeable difference between that part of the screen and the rest of the screen.

Perhaps also check on the back of the LCD panel itself for a make and model number for the panel.

Normally panels are made by specialist LCD panel manufacturers to order and not by the manufacturer of the monitor. If there is a make and model number, then search for (insert make and model number) datasheet to hopefully find it as it will have the specifications of the panel. Maybe not the LEDs themselves but usually their power consumption value, voltage requirements etc which may help.

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Thx @jayeff .

This is super helpful.

It sounds like there is little more I can do until I have it open, yeah?

da

Hi @gusreiber

That's right.

At least you have the manual as a guide.

Good luck

da

@gusreiber

Apologies.

I didn't zoom in far enough before.

The LCD panel (see Item #11 in the service manual you linked above) is a Sharp brand LQ695D3L02 (here are the specs and the datasheet (scroll down to Backlights).

Unfortunately it doesn't give any part numbers for the backlights and I couldn't find any "replacement screens" by searching for the part number for it, in case the backlights are incorporated in the screen assembly and are not a separate removable/replaceable part.

The monitor has an edge lit screen. This means that the LED backlight strips are around the edges and not across the screen in rows as happens a lot with most screens

Hopefully it is the capacitors (and that they're accessible)

How old is the monitor?

Dell has a 3 years Limited Hardware Warranty¹ and Advanced Exchange Service² on the monitor. Maybe worth pursuing if it is not that old yet.

da

@jayeff You are my HERO! Now I can dig into the Sharp LQ695D3L02! ...though I am now suspicious of the power supply more so than the panel itself. Dell is no longer able/willing to help as it is outside its service window.

da

@gusreiber

An easy way to prove whether it is the backlights or the power board is to get a backlight tester (examples only)

Disconnect the power to the monitor and remove the back cover then disconnect the LED power cable(s) connector plug from the power board and connect the tester's red and black leads to the +ve (red) and -ve (black) leads i.e. red to red, black to black, for "each backlight feed" in the cable plug going to the backlights.

The tester supplies the necessary voltage to turn on the LEDs, not the power board

As the LEDs are usually in a series connection on each strip it only takes one faulty LED to cause the whole strip not to turn on.

I couldn't find a power board based on the Dell part number so if it is a faulty board i.e. LEDs are OK when using the tester, check if there's a board number printed on the board or on a sticker on the board.

The same with the LED strips, no good on the Dell part number but usually there's a manufacturer's part number on the strip. You have to disassemble to get to them of course.

da

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Gus Reiber sarà eternamente grato.
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