Tom Ramcigam (magicmarmot) wrote,
Tom Ramcigam

Okay, you know I had to. The DVD player is out of warranty, so I opened it up to see if I could figure out what was wrong with it.

The inside is really pretty simple. The DVD mechanism and the electronics board. Just out of frame is the power supply.

First thing I did was to clean off the lens. That's not really a specific issue, but considering that the player was having an issue reading DVDs, I figured it was worth a shot. I inserted a DVD to see what would happen, and lo and behold, it didn't spin. I gave it a little boost manually, and it started spinning, and the indicator showed that it locked and loaded just fine. I opened and closed the door a few times to see if it would lock up again, and noticed that after a few tries, it seemed weak.

On the electronics board, there are three main ICs. One of them was obviously (to me) the motor drive IC, and I felt it. Little sucker was seriously hot. That would explain the weakness; when the IC gets hot, it loses some of its capacity. The main decoder chip was a little warm to the touch, but not bad. The third chip is a logic chip for handling the buttons and display electronics, and that one was barely even above room temp.

Okay, a bit of history: this DVD player has been to Omegacon twice and has had a bit of rough handling. Somewhere along the way it was dropped and bent a little out of shape. The door open/close was a little impeded, so it was rough going on the thing whenever the DVD was ejected or loaded. Since I had it open, I basically took it apart enough to realign everything, bend the sheet metal back into place that had been bent.

Then I took an empty Diet Coke can and cut a strip from it, and folded it into a sort of accordion fold. I glued this on top of the motor drive IC with a couple of drops of superglue; this acts as a heat sink and will help dissipate the heat from the chip.

I also glued a small piece on the top of the main decoder IC just because it can't hurt.

After running it a bit and opening/closing the door repeatedly, the motor drive IC is a whole lot cooler-- the heat sink is doing its job. Put the cover back on, and all is working fine again.

Go me.
Tags: fixing stuff, mcgyver

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