Ady2017
Senior Member
Last Activity: 11-08-2025, 12:49 PM
Joined: 12-21-2017
Location: Nottingham
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That is the actual soldering iron that Noah used when he built the arc. It is a piece of our heritage my friend. -
Thanks for your reply. This afternoon I have just got my hands on a used smaller soldering iron that can accept interchangeable bits that go all the way down to about 0.1mm so now it is time to learn and practice on an old router PCB. I am a great believer in learning the skills before spending lots of money and this is perfect for me but I do need to get a freestanding magnifier soon.Leave a comment:
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Thanks for the reply. The photo I posted doesn't accurately show the problem as it is zoomed in. Please see the photo below which shows the board compared to a conventional soldering iron and a 1p coin. I can barely see the fuse without a magnifying glass. Are there soldering irons that have tips the size of a needle to be able to get to this thing or do I need a soldering station or hot air gun instead? Probably basic questions but I am just getting started with SMD stuff.
Also, the old fuse was 1.4A 32V but the closest replacement that I can find is 1.5A 32V. I assume it will be...Leave a comment:
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SMD fuse soldering advice please
Hi all. I need to replace an SMD fuse on my camcorder and this is the first time I have had to do any SMD soldering so your advice would be appreciated. Below is a picture of the board that I am working on and I have highlighted the fuse that needs to be replaced. I managed to zoom in to take this picture but the fuse is really tiny and is sandwiched between other components so this is going to be a new milestone for me. I appreciate that I am going to have to buy a new soldering iron if you could advice on what I need please. I was thinking about putting a big soldering iron across the whole... -
Thanks. After reading this I can seen that the LCD has to be programmed which is what the problem is as I am only getting a single line of black blocks from it.Leave a comment:
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I have tried cleaning the lens and the unit is still not working. Is it possible to buy a replacement lens or are there any other tests that can be done on it?Leave a comment:
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Panasonic DMR-EZ48V DVD/VHS combo - DVD recorder part not working
I have recently inherited a Panasonic DMR-EZ48V DVD/VHS combo after my dad died. I tried to record a DVD with it and it worked for about 5 mins before it suddenly stopped. Since then it just keeps making a noise like it is trying to read a disk but then gives a 'no read' error message. I have tried numerous DVD's and it is definitely the recorder that is the problem. I did find a youtube video showing that capacitors on the power board were a common problem on these and so I went ahead and replaced the capacitors but it is still doing the same thing. I now think that it could be the laser that... -
I once had a TV killed by a lightning strike back in about 2006. It was an old CRT TV and when I took the back off of the TV a number of the chips had exploded. There was that much energy that it had blown many of the chips into pieces. Like a fool, I left the TV on during the lightning strike to keep my cat calm but the sound of the TV exploding left the poor cat hiding behind the sofa shaking. Everything gets unplugged now. Time to treat yourself to a new TV my friend.Leave a comment:
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The wire coil that connects to A1 and A2 and goes around the LCD is the pick up coil for the G-Tag. I suspect that there is some kind of driver issue with this with the driver being loaded into one of the chips that are located underneath the LCD. I think I have gone as far as I can with this project without knowing more about how that LCD screen talks to the rest of the LCD board.Leave a comment:
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Here are some more photos of the keypad. It is very hard to find a reasonably priced working keypad for these alarms. It is put me off buying another Risco alarm. I am not very happy that the engineer locked their own code into it as well so would install one myself next time.
When I tried replacing the screen on this one, I disturbed a very small bit of glue holding the G-Tag wiring and the G-Tag now no longer works so it is something to do with the effect that it has on the coil.
...Leave a comment:
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Does anyone know about 16x2 LCD screens used in alarm keypads?
I have got an old Gardtec GT595 alarm which has got a faulty keypad with a failed LCD screen. This was apparently a very common problem with these and many people have had to replace the whole alarm because of this problem. Somebody claims to be able to repair the keypads by replacing the screen and I have tried it myself by replacing the LCD with a commonly available HD44780 1602 16x2 Serial LCD screen but it is not working. I am sure it is a problem with a driver or simular which is not allowing the screen to talk to the rest of the electronics. Does anyone know what this original screen was...
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Thanks for your replies. I have just picked out some Panasonic FR caps which seem to be best suited to this application. The only size I have struggled with is 47uF 10v. They do not make this size in the FR or FM series but do make a 16v cap in the FC series which seems to be my only option. My second choice was one from the Nichicon PW series but they seem to have now discontinued the 47uF 10v and 16v.
Why are the delivery charges so high for Farnell UK? It is free collection for RS but then the caps sometimes only come in bags of 25+Leave a comment:
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Are there any datasheets available for Elna RJG capacitors?
I have a 2007-era Panasonic VHS combo that is full of of Elna RJG capacitors. I am trying to test the capacitors to diagnose the machine and then select replacement capacitors but I can not find any datasheets for them. I did find a Elna catalogue from 2007-2008 but there is no mention of this capacitor series. Where these specially made for Panasonic and so not made available to the public? Any ideas what to find out what the ESR values should be without the datasheets? They are all between 10V and 50V and 47uF and 1800uF. None are leaking or bulged but I know that they need to be tested to be... -
Any good references for variable capacitor design?
I have recently decided to put together a 1930's style crystal radio as a father-son project to get him started in electronics. The lack of availability of now-obsolete variable capacitors is causing a big headache. From what I have seen on the internet, a number of people have resorted to making their own variable capacitors but have not given any details about how they designed them. Does anybody have any old references for the design of variable capacitors which includes details such as plate spacing, plate size, number of plates, best materials to use, etc. -
Re: LG 42LD490 stuck in standby with flashing red light
Just thinking about it a bit more, it makes sense that it would be a main board issue as once the TV is on, it would happily keep working 24/7 until I switch it off and let it cool down. My bedroom TV on the other hand likes a new set of PSU caps every other year and the first sign of trouble is it keep switching itself off when it gets hot.
I have had a ESR meter on my list of things to buy for a while but I am a bit dubious about buying anything from ebay and especially being dispatched from China!Last edited by Ady2017; 11-16-2021, 03:10 PM.Leave a comment:
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Re: LG 42LD490 stuck in standby with flashing red light
Yes, that seems like a great idea as whatever component it is that is faulty it does not like being cold. Try warming up the PSU first and if not then try warming up the suspect IC on the main board. It is one of those challenging intermittent problems - the TV is on right now and is working perfect but nobody dare turn it off!Leave a comment:
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Re: LG 42LD490 stuck in standby with flashing red light
Update - I have just been around the back of the TV and tried to listed where the high pitch sound is coming from which it makes while trying to start up. It is definitely coming from the main board and not the PSU board and so I guess that is the most likely culprit then.
It looks like the place selling a capacitor kit for the PSU to fix the problem is misleading.Leave a comment:
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LG 42LD490 stuck in standby with flashing red light
The problem with my TV is very similar to an earlier post but there was no final solution posted.
When the TV is first turned on from cold it will not turn on. The red standby light begins pulsing and a high pitch whine is heard. The back light remains off. If the TV is left trying to boot like this and then turned off and on again a few times then eventually it will turn on and sit there working all day long.
I initially suspected the PSU after spotting this kit for sale,
http://www.ohmsupplies.co.uk/epages/...ops/62027733/P... -
Is there a manufacturers tolerance for ripple?
Hi all
I need to replace a 680uF 35V SamYoung NXB cap which has got a ripple of 1820. Whilst passing my local little electronics shop I picked up what they had in stock which was a 680uF 35V Panasonic FC with a ripple of 1655.
As the ripple rating is only 9% below what the original was I am wondering whether to risk it and fit it.
The catalogues specify a capacitance tolerance of +/-20% but state nothing about the ripple. If there is a similar tolerance for ripple then I might be worrying about nothing. Does anybody know?
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Is it ok to use a capacitor with a much higher ripple?
Hi all
I am trying to source some new caps for the power board on my LG TV. The one I am currently struggling to find a replacement for has the specs:
Sam Young KMG 680uf 50V with a rated ripple current of 973. According to the catalogue these seem to be a general purpose capacitor and it is not clear why LG have used them on the power board.
I like to use Panasonic capacitors but most of these have got a ripple voltage of 2-3 times the figure of the original capacitor. My preferred FR capacitors are 3160 while the FC ones are 2215. Would going from 973 to...
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