Digest for sci.electronics.repair@googlegroups.com - 7 updates in 3 topics

9:40 AM Penedão
Jannie <janniebrand@gmail.com>: Aug 29 01:48PM -0700

> You asked for a suggestion, I have one. SMPSUs are not the simplest things for beginners, and this one sounds well knackered. I suggest picking up another piece of e-waste & fixing that. You're not gonna fix them all.
 
I have to be honest, I have been thinking the same thing, but I was and still am willing to give a go if it is indeed fixable. It's not like the parts cost that much or like I would be risking breaking it, so even if I screw it up completely, then I'm still at the very least learning something along the way.
 
I do get your point however and I might just throw in the towel if no one can advise as to which "Current Mode PWM Power Switch" I should try (from this link: https://www.mantech.co.za/Stock.aspx?Query=PWM+DIL08and) in order to replace the current "OB2358" part with or if someone can confirm that it's not a part that you could just replace with a similar part from the link.
 
Anyway, it's neither here nor there. I just thought I'd give it a go and hopefully learn something in the process, which I most definitely have so far.
tabbypurr@gmail.com: Aug 29 10:44PM -0700

On Thursday, 29 August 2019 21:48:20 UTC+1, Jannie wrote:
 
 
> I have to be honest, I have been thinking the same thing, but I was and still am willing to give a go if it is indeed fixable. It's not like the parts cost that much or like I would be risking breaking it, so even if I screw it up completely, then I'm still at the very least learning something along the way.
 
> I do get your point however and I might just throw in the towel if no one can advise as to which "Current Mode PWM Power Switch" I should try (from this link: https://www.mantech.co.za/Stock.aspx?Query=PWM+DIL08and) in order to replace the current "OB2358" part with or if someone can confirm that it's not a part that you could just replace with a similar part from the link.
 
> Anyway, it's neither here nor there. I just thought I'd give it a go and hopefully learn something in the process, which I most definitely have so far.
 
I don't think you've got enough info to fix it. You might be lucky but too often power parts are killed by something else going wrong. You've got a relatively complex supply, many fried parts, no idea what caused the failure and you don't know what the parts even are. I'd move on at this point.
 
 
NT
janniebrand@gmail.com: Aug 30 03:12AM -0700

> I don't think you've got enough info to fix it. You might be lucky but too often power parts are killed by something else going wrong. You've got a relatively complex supply, many fried parts, no idea what caused the failure and you don't know what the parts even are. I'd move on at this point.
 
Fair enough. Thank you for all the help and info. I have certainly learned a few things, which will help me going forward.
 
A last question perhaps, would it be worth a try to see if I can find a working 220v AC to 15v DC board and then just swap the broken one out with the working one and perhaps just do some soldering for the connecting wires? If so, is there anything specific that I should be aware of or look out for?
tabbypurr@gmail.com: Aug 30 09:26AM -0700

On Friday, 30 August 2019 11:12:37 UTC+1, janni...@gmail.com wrote:
NT:
 
> > I don't think you've got enough info to fix it. You might be lucky but too often power parts are killed by something else going wrong. You've got a relatively complex supply, many fried parts, no idea what caused the failure and you don't know what the parts even are. I'd move on at this point.
 
> Fair enough. Thank you for all the help and info. I have certainly learned a few things, which will help me going forward.
 
> A last question perhaps, would it be worth a try to see if I can find a working 220v AC to 15v DC board and then just swap the broken one out with the working one and perhaps just do some soldering for the connecting wires? If so, is there anything specific that I should be aware of or look out for?
 
If it's just the supply that's fried who knows, might work. Can you not find other dumped electronics?
 
 
NT
N_Cook <diverse@tcp.co.uk>: Aug 30 05:21PM +0100

A collection of LCD display readings and their SPI codings with the
repeated sections removed, leaving just 4 "rows" of 3 hex characters
(intervening repeated strings removed for clarity, described earlier in
this thread, would come into play for hundreds /thousands/other rows in
the diplay perhaps).
The first rank all even(eg 2,6,C,8 in the 1.014m reading is the mm
(thousandths) ,0 to 9
The second rank (eg C,D,5,C in the 1.014) is the cm (combined tenths and
hundredths) , 00 to 99
The third rank (eg 0,1,1,0 in the 1.014 or 7,D,7,5 in the 30.190 ) is
the combined units and tens
so 0, 1,2,3 ... 99
going by the pairings of "19" in 30.190 and 2.197, both coded to 9,5,7,3
and "20" in 8.206 and 9.206 , both coded to D,B,D,7
Perhaps someone can see octal coding or something , to avoid determining
two sets of 100 pairings, but so far I've not managed to reduce the
required look-up conversions required.
 
1.014
2,C,0,
6,D,1,
C,5,1,
8,C,0,
 
1.036
6,D,0,
E,D,1,
8,7,1,
C,D,0,
 
2.197
2,9,3,
6,5,2,
4,7,1
4,3,1,
 
 
4.235
6,D,0
6,9,3,
8,F,3,
C,5,0
 
5.265
6,D,1,
6,B,3,
8,E,2,
C,7,1,
 
6.243
6,C,3,
6,9,3,
C,F,2,
4,6,1,
 
7.112
6,8,0
A,5,1
C,5,1
4,0,1,
 
 
8.206
6,D,3,
E,B,3,
8,D,3,
C,7,1,
 
9.206
6,D,1,
E,B,3,
8,D,3,
C,7,1
 
 
10.217
2,C,3,
6,9,5,
4,D,7,
4,4,1,
 
16.388
6,D,3,
E,7,7,
C,F,6,
C,7,1,
 
22.136
6,9,F,
E,5,A,
8,7,5,
C,1,5,
 
26.766
6,9,F,
E,7,B,
8,6,6,
C,7,5,
 
 
30.190
6,9,7,
E,5,D,
4,7,7,
C,3,5,
 
30.191
2,9,7,
6,5,D,
4,7,7,
0,3,5,
 
30.192
6,9,7,
A,5,D,
C,7,7,
4,3,5,
 
30.195
6,9,7,
6,5,D,
8,7,7,
C,3,5,
 
30.196
6,9,7,
E,5,D,
8,7,7,
C,3,5,
 
The 30.19 set was setting up on a tripod and repeated grabbing codings
until I got a repeat reading. This was at dusk, after a sunny day, but
even so over 30m , for 6 readings involving switching off and on again ,
just a spread of 6mm and no guarantee my touching the buttons did not
upset the tripod a bit.
 
--
Monthly public talks on science topics, Hampshire , England
<http://diverse.4mg.com/scicaf.htm>
Paul Drahn <pdrahn@jodeco.com>: Aug 29 09:56AM -0700


> 'Ideal' B+ voltage is determined by the specific tube installed.
 
> Peter Wieck
> Melrose Park, PA
 
I built a two tube radio about 20 years ago using 01A tubes. I put 5
regular 9 volt batteries in series to give 45 volts for the radio.
Worked fine.
 
You know you can plug the 9 volt batteries + to - using the connectors
on top?
 
Paul
tabbypurr@gmail.com: Aug 29 10:42PM -0700

On Thursday, 29 August 2019 17:56:39 UTC+1, Paul Drahn wrote:
 
> You know you can plug the 9 volt batteries + to - using the connectors
> on top?
 
> Paul
 
Not a bad idea. They'd last ages too.
 
 
NT
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