Latest threads in Electronics Repairshow only best voted threads
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Sumsung monitor intermittent startup
Hi, Samsung 931B LCD Monitor Monitor and computer are switched off overnight. In the morning I switch on the monitor and computer The monitor switch button glows blue Display flickers on and off maybe...
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14 years ago
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Euphonic Adio iamp 350,2001
Just curious in passing, anyone know why there is a 555 in there, on the pa/ps? delay-on or delay-off timer perhaps? -- Diverse Devices, Southampton, England electronic hints and repair briefs ,...
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14 years ago
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wireless doorbells
I'm wondering if anyone has any experience with wireless doorbells. The last couple of days mine has been ringing a couple of times on its own (no, it isn't a pre-Halloween prank). I have some...
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14 years ago
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LED display (MAN6730) problem
Hello, I am just repairing a fairly old instrument (manufactured in 1989) which employs two LED displays (driven by ICL71xxx family chip), one of the displays is 1 and 1/2 digits, RED color common...
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14 years ago
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Sherwood tuner died.
Hi All, I have a fairly old but lightly used Sherwood R 125 RDS ss FM receiver but note the FM tuner has died. Well, it's working in as much it appears to auto tune and lock onto a station and with...
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14 years ago
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Crate GT-80 amplifier..
I have determine that the power supply transformer in a Crate GT-80 needs replacing. This becomes obvious when you remove all the secondaries from any circuit and it still wants to take out it's...
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14 years ago
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Split HEX files..
Hi guys! Please i need support! I have an hex file and i need to split it in low bytes and high bytes. My eprom programmer just don't handle this function.I have to burn one low bytes eprom and one...
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14 years ago
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Cannot touch bottom left of 4-wire touch screen
Symptom: When moving up and down the left side of touchscreen, it inputs an arch running from the top left to the middle bottom. I have an old Psion netbook with a four wire touchscreen which I cannot...
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14 years ago
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Good Will GPS1810OH Power supply problem
I have an old GPS1810OH Power supply and I wanted to know if any of you might have one on your bench... Mine has a semiconductor that has the top of it fried and I can't read the part number... If...
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14 years ago
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variable voltage high current from computer ATX supply?
Is there a simple way to make a computer power supply variable and maintain high current? I keep seeing designs that use LM317T's, but they're limited to 1.5 A or less. I'd like to be able to retain...
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14 years ago
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Acer 5520 won't power up?
An Acer 5520 notebook. Press power, the notebook powers on for a couple of seconds then powers off by itself. Then (without touching anything) it repeats the same power on/off cycle where the on is...
7
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14 years ago
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ABI CMOS/TTL etc tester / Coutant RL 150/100 SMPS
Went to use it this week , first time for ages and not a dickybird, no magic smoke/ ominous noises. Just single cycle slow repeat ping/clicks from the inverter transformer. Was working fine last time...
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14 years ago
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How long does a resistor last?
When run at its rated power? I'm referring to 1/4 - 10 watt resistors in TVs and PC power supplies, probably in 30-50 Celcius surrounding air. I thought that resistors were supposed to be chosen for...
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14 years ago
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identifying transistor
Hello all, I need to replace a transistor which only markings are the motorola logo and "9570". It's TO-92 case and NPN (measured a good one in the same circuit). Any hint on specs about it are...
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14 years ago
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Looking for Leonard
Leonard Caillouet Bob from SIS would like to say Hi, and know what happened. I know there was an issue about service manuals. Hope that wasn't what happened, I didn't make the call.
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14 years ago
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