Forum: General Electronics Technical Discussion
10-28-2021, 05:03 PM
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Replies: 3
Views: 609
Re: XGecu TL866II Plus not reading and not writing
I am not familiar with that EXACT unit but maybe try to be sure the USB/serial port is properlay set? verify the COM port and the settings / speed - some use a software serial emulation over usb or...
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Forum: General Electronics Technical Discussion
10-19-2021, 06:19 PM
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Replies: 49
Views: 5,889
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Forum: General Electronics Technical Discussion
10-19-2021, 06:14 PM
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Replies: 7
Views: 917
Re: AC / DC ADAPTER upgrade?
Start with checking the rating of those MOSFETs that have heatsinks. Then check the transformer rating. Check the DIODEs for their ratings as well. Those are the man components of concern. I am...
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Forum: General Electronics Technical Discussion
10-03-2021, 06:56 PM
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Replies: 49
Views: 5,889
Re: Help identify a Zener?
Jopat, According to Redwire prior post..."The parts are vanilla switching transistors, anything would work"...I just used parts I had on had or on other unused circuit boards :D
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Forum: General Electronics Technical Discussion
07-03-2021, 06:02 PM
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Replies: 18
Views: 1,233
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Forum: General Electronics Technical Discussion
06-11-2021, 02:59 PM
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Replies: 4
Views: 722
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Forum: General Electronics Technical Discussion
02-17-2021, 05:39 PM
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Replies: 49
Views: 5,889
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Forum: General Electronics Technical Discussion
01-13-2021, 07:55 PM
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Replies: 3
Views: 1,034
Re: ID and Sourcing a Microswitch
or go grab one off an old router or modem or any similar electronics that you might have in the junk box. the reset buttons are same.... its likely SPST momentary contact NO.
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Forum: General Electronics Technical Discussion
01-03-2021, 02:53 PM
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Replies: 1
Views: 713
Re: Video receiver
the LM1889 is used to create an RF that can be input to an antenna of a TV. If you are sending the video from the TDA2549 to RCA and wangt to modulate the video again ( like change the RF frequency...
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Forum: General Electronics Technical Discussion
12-28-2020, 11:25 AM
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Replies: 12
Views: 1,470
Re: Detecting exact bad ram chip.
What a waste of time and effort! Why spam garbage from Redit ? :facepalm: I am doumbfounded. they must make some decent $ by doing this???
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Forum: General Electronics Technical Discussion
12-25-2020, 11:01 PM
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Replies: 13
Views: 1,704
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Forum: General Electronics Technical Discussion
12-25-2020, 12:08 PM
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Replies: 13
Views: 1,704
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Forum: General Electronics Technical Discussion
12-25-2020, 11:56 AM
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Replies: 13
Views: 1,704
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Forum: General Electronics Technical Discussion
10-18-2020, 01:13 PM
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Replies: 12
Views: 1,033
Re: SMPS Resistor confirmation
Great idea fellas! The bulb trick I have heard of before, I will give that a whirl. I see that kit on ebay and its reasonable. Thanks for all the help and suggestions! :groucho: Red and rj.
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Forum: General Electronics Technical Discussion
10-17-2020, 09:12 PM
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Replies: 12
Views: 1,033
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Forum: General Electronics Technical Discussion
10-17-2020, 01:13 PM
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Replies: 12
Views: 1,033
Re: SMPS Resistor confirmation
I did not put a screw since it would likely short :( I will check Q602 - do you think i can get by with R611 as 1 Ohm? I def. do not have any SUB-ohm on hand.
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Forum: General Electronics Technical Discussion
10-17-2020, 12:04 PM
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Replies: 12
Views: 1,033
Re: SMPS Resistor confirmation
For the primary rectifier diodes I used what I had on hand. 1N4007 the originals are 1N539BL. The zener was 1ZB36BL. What looks like electrical tape is thermal padding I had for a big SCR since...
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Forum: General Electronics Technical Discussion
10-17-2020, 09:54 AM
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Replies: 12
Views: 1,033
Re: SMPS Resistor confirmation
My next step after fixing the resistor was going to be pull the transformer (on the output side of the MOSFET) and see if does not blow the fuse.
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Forum: General Electronics Technical Discussion
10-17-2020, 09:49 AM
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Replies: 12
Views: 1,033
Re: SMPS Resistor confirmation
I did not notice that transistor! thanks - here are both sides... the rectifier on the AC mains I replaced but it blew immediately. so those two are still missing. it is a full wave bridge...
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Forum: General Electronics Technical Discussion
10-17-2020, 09:10 AM
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Replies: 12
Views: 1,033
SMPS Resistor confirmation
I have not done too much SMPS repair. The resistor in this pic looks like a 0.68 Ohm 5% value correct? It is OPEN. The zener across it is a 36V that was shorted. When did they start making SILVER...
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Forum: Troubleshooting Game Consoles & Other Weird Devices
10-12-2020, 08:59 AM
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Replies: 11
Views: 2,112
Re: Treadmill Motor Control Board 032669-IF
The general things you can do are, INSPECT the board and componenets on both sides. The underside for any solder joints that might be "cold" - Also look for capacitors that might have leaked or...
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Forum: Troubleshooting Game Consoles & Other Weird Devices
10-09-2020, 07:50 PM
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Replies: 26
Views: 6,057
Re: Oven LCD display dim and uneven
perhaps check the VFD display solder connections to the main board? if you can inspect them wth a magnifying glass. You might see solder joints that are cracked. reflowing the joints with some...
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Forum: General Electronics Technical Discussion
10-09-2020, 04:08 PM
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Replies: 49
Views: 5,889
Re: Help identify a Zener?
Sure sounds familiar! I have a large deductable so no help there! the a/c compressor was at end of life so they would not offer much and that would be the largest cost! so not worth it in my case....
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Forum: General Electronics Technical Discussion
10-09-2020, 09:20 AM
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Replies: 49
Views: 5,889
Re: Help identify a Zener?
Oh yeah! it destroyed all told: garage sensors, the logic board had 2 fried SOT23 transistors for the relays and one diode across a relay. The Zener 6.2V on the main logic board was shorted. it...
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Forum: General Electronics Technical Discussion
10-08-2020, 03:42 PM
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Replies: 13
Views: 2,301
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