Backlight/bivert problem DMG (Page 1) - Nintendo Handhelds - Forums

1 Apr 19, 2017 6:24 pm

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I did a backlight and bivert mod on A DMG-01, using a Deadpan Robot backlight kit and a Hand Held Legend pcb. After modding, all grey tones have disappeared, as shown in the following image:

The connections on the bivert pcb seem correct according to HHL's instructions, can read any short circuits across the pins and the ribbon cable seems properly seated. Image of the pcb here:

Before I pull the bivert pcb to test if the system is otherwise working properly, I've gotta ask - has anyone else run into this problem, and, if so, any ideas on the cause?

Last edited by irony7 (Apr 19, 2017 7:08 pm)

Does the installation really not call for pins to be put through the pads? That's super janky. It's probably just not making full contact. Try adding a metal lead through the pads. Clip one off of a resistor or LED or something.

3 Apr 19, 2017 7:39 pm

irony7

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I will do it, Apeshit! Tried to reflow the solder through the the holes to ensure contact with the pads underneath, but that is a definite possible culprit.

4 Apr 19, 2017 7:42 pm

Apeshit

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irony7 wrote:

I will do it, Apeshit! Tried to reflow the solder through the the holes to ensure contact with the pads underneath, but that is a definite possible culprit.

Just keep them well trimmed, since that kit is mounted right under the ribbon cable carrying the high voltage for the LCD.

These kits really should be designed to be mounted on the back of the PCB...

5 Apr 19, 2017 7:50 pm

irony7

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Apeshit wrote:

Just keep them well trimmed, since that kit is mounted right under the ribbon cable carrying the high voltage for the LCD.

Will do.

Apeshit wrote:

These kits really should be designed to be mounted on the back of the PCB...

I've had success biverting with chips before, it's just that the pcb seem are so much sexier and take up less space.

6 Apr 19, 2017 9:19 pm

Apeshit

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I never said they shouldn't use a PCB. It's just mounted in a bad spot. Of course it will work, but it's bad practice to mount components under such a vulnerable spot. You could effectively use up half the space and still mount it on the back of the PCB.

7 Apr 19, 2017 9:34 pm

irony7

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Understood, Apeshit. And it makes a lot of sense. I'll do your suggestion with a lead first, but will at the same time check out moving the board to tge other side of the LCD pcb.

8 Apr 19, 2017 9:40 pm

catskull

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NUMBSKULL

Here's a thing I had an issue with a while back: http://chipmusic.org/forums/topic/18845 … wo-shades/

Note where I cut the traces. Make sure you're not having the same issue.

9 Apr 20, 2017 6:46 am

irony7

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catskull wrote:

Here's a thing I had an issue with a while back: http://chipmusic.org/forums/topic/18845 … wo-shades/
Note where I cut the traces. Make sure you're not having the same issue.

Tha nk you for that link, Catskull, looks to be exactly the same problem. As soon as I get home from work I'll gewt my head around it and do the fix.