Minor setback

Somehow I knew that this went over too easy. Fortunately, magic smoke SMELLS. Just got the battery out in time, but part of the damage already happened.

Defective LED

Bang!

Defective LED

...and another.

Some days ago, one of the triple-chains on the right half of the screen went out. While the darker area is clearly visible, the shadow is still illuminated by the neighboring LEDs. The cause is the LED in the second picture, the damage is only visible as a slight dark streak in the center of the yellow part. Then today the backlight fuse blew out of this world, and the reason is seen in the first picture. I knew this was a close call, but precisely “calibrating” the almost not existent isolation gap between LEDs and metal (by wedging a piece of paper in every here and there during glueing 😀 ) gave me no no reason for concern. Maybe some flexing or thermal deformation did the rest.

Anyhow, got to rebuild this part. Not too bad though, the stripes are inexpensive and I wanted to include a diffusor sheet anyway. As good a chance as any I guess.

Edit: By the way, the driver circuit survived the whole mess just fine. That IC is some tough design! Haven’t managed to fry a single one of those so far.

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2 comments

  1. Tobi says:

    oh mann wie blöd!
    Ich sollte meins evtl auch nochmal aufmachen und gucken, wie nah das am Rahmen dran ist.. aber eigentlich hab ich keine Lust das neue Display wieder aufzumachen 😉
    Immerhin gibt mir der Defekt jetzt wieder eine Möglichkeit, dich wieder einzuholen…
    lg!

    • lordicewind says:

      Ja, war schon derb ungeschickt :/ Hätt nicht gedacht, dass das passiert.
      Ist zum Glück beides auf demselben Streifen, das heißt schonmal nur einen tauschen.
      Aber da ich eh noch einen diffusor reinlegen wollte, damit man die Strahlen nicht so arg sieht…btw war die Sicherung mit ein Grund für die Flackerei ^^ ganz weg war die danach nicht, aber deutlich besser. Hat wohl doch einen zu hohen Serienwiderstand für die Anwendung.
      gruß =)

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