Category Archives: Fix me.

Things that needed repairing.

Error U81 — Panasonic DMR-EX75 repair

Some explanation:

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Status lamp on the loose — Partial oven teardown

ARGH! I can’t be having with that! I do hope this lamp is a low voltage one…

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Acer AL1916 LCD monitor — attempted fix

For a couple of days now, the monitor doesn’t want to run on full brightness anymore. If I go up to 95%, it runs if warm, but might not start up. Set it to anything higher and it comes on … Continue reading

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Mental illness in microcontrollers — or in the programmer ?

A while ago I thought it was time to re-implement my clumsy attempt to have some sort of communication between 3 microcontroller boards. It is half-duplex only, so that can’t be hard, can it? As the ATtiny24s don’t have a … Continue reading

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I shall smite yee till kingdom come — Arrrrrr!

ENOUGH OF THIS INSANITY! In my previous post I described how and why I’ve temporarily wrecked my beloved power supply. Thankfully these 390mΩ 5W resistors are available. Right now I could only find 5% types, but ” bettar tan nottin’ … Continue reading

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Failure by Design – My digital power supply

It’s a Voltcraft DIGI-35 CPU. So far I’ve been quite fond of it and given its age of more than 15 years rightly so I think. The markings on the PCB read: “CTC/91 DIGI-35” and “18132 4350009427”. It’s the black … Continue reading

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Floating voltages and bad GND connections — getting zapped and worse

Nothing good can come from a freak idea after mi….. Wait! This time I actually learned something, or in more pleasant words: I was reminded that there was something about floating power supplies, measuring voltages and something called ‘common ground’. … Continue reading

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Jyetech AVR digital oscilloscope DIY KIT — trying to fix it – part 2

Maybe you remember my last post about the Jyetech oscilloscope and it’s weird behaviour. Not all of them are strange, as the free replacement DIY KIT I received from them works fine. At that time I suspected a sick ATmega64 … Continue reading

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Note to self: 26.0V >> 2.60V — A short ChipQuik review

Nothing good can come from a freak idea after midnight !

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Jyetech AVR digital oscilloscope DIY KIT — trying to fix it – part 1

The symptoms since a firmware upgrade (and downgrades, re-upgrades…): strange characters on the display for SEC/DIV system freezes +/- buttons are ignored (but still work physically) the ADC chip doesn’t get a CLK signal during a freeze My theory: The … Continue reading

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Jyetech AVR digital oscilloscope DIY KIT — Firmware upgrade odyssey

I bought the DIY KIT at seeedstudio recently, as I needed to feed my soldering obsession. Here are some images of the KIT coming right out of the box: I had to use my milling machine, because the front panel … Continue reading

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Trying to fix the sound of my Sega Game Gear — part 2

I was lucky :-) It seems the guys at Sega just replaced the 470µF capacitors shown in the reference setup for the TDM2822M dual amplifier with 47µF ones. Other people have had problems with these too, so I just pulled … Continue reading

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Trying to fix the sound of my Sega Game Gear — part 1

Last time I turned it on, I didn’t get the usual boot-up sound of ‘Seeeeegaaaaa’. There’s a little chip next to the earphone plug. I haven’t checked yet, but I suspect it’s some kind of amplifier. So I’ll warm up … Continue reading

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