Forum: Troubleshooting Game Consoles & Other Weird Devices
Yesterday, 12:51 PM
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Replies: 8
Views: 233
Re: Drying Oven - Preset Temp Fail
Mechanical failure - temp sensor beatup up, broke, got water in it, broken wires, corrosion I would also rule out. It might be a thermistor but the resistance could be compared between ovens.
The...
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Forum: General Electronics Technical Discussion
Yesterday, 12:39 PM
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Replies: 7
Views: 195
Re: DVM circuits
The PC board is "MX-480D-B" but no hits.
I don't see the usual two-transistor clamp or a PTC thermistor. Low cost DMM's sometimes have missing protection circuits and they easily die.
I would...
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Forum: Troubleshooting Game Consoles & Other Weird Devices
01-21-2021, 09:44 AM
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Replies: 8
Views: 233
Re: Drying Oven - Preset Temp Fail
Check if the triac on the big heatsink is shorted between MT1 and MT2. Those are the fat wires on it. That would leave heat on all the time until the safety cutouts trip.
Triac is TAG semiconductor...
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Forum: General Electronics Technical Discussion
01-20-2021, 01:37 PM
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Replies: 7
Views: 195
Re: DVM circuits
There's lots of DVM schematics out there, if you have a make/model or pictures of the board it can help figure out the DVM chip used and what parts might be damaged.
Usually a low cost DVM...
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Forum: Equipment Usage, Soldering, Techniques, and Reviews
01-20-2021, 01:30 PM
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Replies: 40
Views: 7,032
Re: KSGER STM32 T12 soldering stations
Check the handle and its wiring. The shake switch can be installed upside down or wired wrong and it picks up noise.
Here is the schematic for your KSGER 24V power supply at post #3....
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Forum: Troubleshooting Audio Equipment
01-19-2021, 12:35 AM
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Replies: 12
Views: 276
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Forum: General Electronics Technical Discussion
01-16-2021, 02:59 PM
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Replies: 11
Views: 517
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Forum: Troubleshooting Audio Equipment
01-15-2021, 09:36 PM
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Replies: 20
Views: 667
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Forum: Troubleshooting Audio Equipment
01-15-2021, 02:55 PM
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Replies: 20
Views: 667
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Forum: General Electronics Technical Discussion
01-15-2021, 02:36 PM
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Replies: 18
Views: 4,197
Re: Repairing Remotes
OK so that repair did not last long. The problem is no glue really sticks to polyethylene and the pads fell off.
Next, I tried a USD $7 rubber pad kit from fleaBay "keypad repair KIT for IR remote...
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Forum: Troubleshooting TVs and Video Sources
01-15-2021, 02:30 PM
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Replies: 6
Views: 225
Re: Can you revive TV remote controls?
This has been discussed before: https://www.badcaps.net/forum/showthread.php?t=26547
I have the best success using conductive rubber pad kits, I'll update that thread...
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Forum: Troubleshooting Computer Displays
01-14-2021, 09:14 PM
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Replies: 3
Views: 281
Re: Samsung SyncMaster740N ?
Check the replacement capacitors are still OK, they might have died after 5 years, if they were not top brands.
In a dark room, you can see backlight bleed-through and the tubes run across the top...
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Forum: General Electronics Technical Discussion
01-13-2021, 11:07 PM
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Replies: 9
Views: 292
Re: Load Testing Audio PA Amplifiers
My reply seems to have vanished :why:
Yes loudspeakers are inductive, a large woofer has several mH.
But a crossover network has the Boucherot cell...
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Forum: Troubleshooting Audio Equipment
01-13-2021, 08:47 PM
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Replies: 5
Views: 228
Re: onkyo 919 Receiver... hum problem but...
The ribbon cable connectors have a release latch. If you don't undo the latch- you will trash the connector. I thought it's a bar that you poke with a small screwdriver that pushes back the spring on...
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Forum: Troubleshooting Audio Equipment
01-13-2021, 08:44 PM
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Replies: 24
Views: 522
Re: Old Pioneer Amp - Waveform explanation
The transistor pair's beta need to be well matched if you're replacing the 2SC2259's and expecting low offset voltage.
At this age, I would replace the few electrolytic capacitors in the power amp....
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Forum: Troubleshooting Computer Displays
01-13-2021, 08:40 PM
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Replies: 3
Views: 281
Re: Samsung SyncMaster740N ?
It sounds like the CCFL backlight IC is shutting down. They turn on the backlight, if it detects abnormal current, such as open tube, arc, bad connection they shutdown after a few seconds.
See if...
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Forum: General Electronics Technical Discussion
01-13-2021, 01:36 PM
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Replies: 11
Views: 468
Re: 4017 counter reset problem
In your first circuit, I would make some changes, such as adding a driver transistor for the relay because a 4017 has weak output drive a few mA. It would be a circuit that either counts to one or...
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Forum: Troubleshooting Audio Equipment
01-12-2021, 02:07 PM
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Replies: 24
Views: 522
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Forum: General Electronics Technical Discussion
01-12-2021, 02:01 PM
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Replies: 9
Views: 292
Re: Load Testing Audio PA Amplifiers
You can use mains heaters - ovens, stove elements as low cost load resistors. You must have a fan of course. 500W or 1000W convection cooled is no good.
You can blow amplifiers doing full power...
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Forum: Troubleshooting Audio Equipment
01-08-2021, 02:02 PM
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Replies: 24
Views: 522
Re: Old Pioneer Amp - Waveform explanation
Maybe post a pic of the pc board, the newer version A-5 seems to have parts numbered transistors Q400-up, caps C400-up and the old JFET version was like C16, C17 with a few extra op-amps for servos.
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Forum: Troubleshooting Game Consoles & Other Weird Devices
01-08-2021, 01:57 PM
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Replies: 50
Views: 4,541
Re: LG Washer/Dryer Power Fail
OK good :) just for anyone else who needs to fix an LG combo washer dryer model 1480YDS.
You were really thorough with the repair and have some good data.
So expensive to just toss them out and...
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Forum: Troubleshooting Game Consoles & Other Weird Devices
01-07-2021, 08:45 PM
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Replies: 50
Views: 4,541
Re: LG Washer/Dryer Power Fail
Thanks for the update.
The diode D243 is for 22V fan motor it seems. An ES3 (https://www.vishay.com/docs/88589/es3.pdf) is a normal diode 0.9Vf and will run ~20% hotter than Schottky SS36...
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Forum: Troubleshooting Audio Equipment
01-07-2021, 08:29 PM
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Replies: 24
Views: 522
Re: Old Pioneer Amp - Waveform explanation
There's three different Pioneer A-5 service manuals: (https://www.hifiengine.com/manual_library/pioneer/a-5.shtml)
HE, HB - Europe, UK models ART-618 but I found ART-621.
YP, S, KC - Australia,...
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Forum: General Capacitor Questions & Issues
01-02-2021, 01:43 PM
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Replies: 13
Views: 1,334
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Forum: Troubleshooting Game Consoles & Other Weird Devices
12-24-2020, 12:13 AM
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Replies: 13
Views: 643
Re: Matsui 175S microwave fuse replacement
The schematic does show the red wire connections, the white is the filament winding. So the transformer and HV fuse do connect to the cap right terminal like you've got it.
Are you going to test...
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