Forum: Troubleshooting TVs and Video Sources
01-15-2021, 05:09 AM
|
|
Replies: 9
Views: 178
Re: SOVOS Flip down TV SVKTV156A
Hi yes cleaned up the mess.
Perhaps when the board was made they did not have the proper surface mounted capacitors.
Attached some more pictures .
Got the 12 volts and 5 volts working .
Just need...
|
|
Forum: Equipment Usage, Soldering, Techniques, and Reviews
01-14-2021, 02:56 PM
|
|
Replies: 68
Views: 50,032
|
|
Forum: General Electronics Technical Discussion
01-14-2021, 02:52 PM
|
|
Replies: 11
Views: 448
Re: 4017 counter reset problem
Thinking about it I decided to use two transistors in a darlington configuration .seems to work OK .
Next step is to try it out.
|
|
Forum: Troubleshooting TVs and Video Sources
01-14-2021, 02:49 PM
|
|
Replies: 9
Views: 178
Re: SOVOS Flip down TV SVKTV156A
I dont know i,t is right bodge took a lot of getting off.
I spoke to the owner and she said it had never been repaired before ?
As I said before the caps are far too large ,jammed in and glued down...
|
|
Forum: Troubleshooting TVs and Video Sources
01-14-2021, 10:37 AM
|
|
Replies: 9
Views: 178
|
|
Forum: Troubleshooting TVs and Video Sources
01-14-2021, 10:29 AM
|
|
Replies: 9
Views: 178
Re: SOVOS Flip down TV SVKTV156A
OK thanks for that
Just run the TV up today after sorting out a few thing its working .
Ordered some much smaller capicitors for the power supply which should finish the repair.
Still cannot...
|
|
Forum: General Electronics Technical Discussion
01-14-2021, 10:22 AM
|
|
Replies: 11
Views: 448
Re: 4017 counter reset problem
Hi think you are right about the transistor ,just knocked up a circuit to try ,a capacitor about 10 uF and a IRFBC30 mosfet (got lts of these) .
The output from the counter is now AC coupled so if...
|
|
Forum: Troubleshooting TVs and Video Sources
01-13-2021, 01:36 PM
|
|
Replies: 9
Views: 178
|
|
Forum: General Electronics Technical Discussion
01-13-2021, 01:29 PM
|
|
Replies: 11
Views: 448
|
|
Forum: Troubleshooting TVs and Video Sources
01-13-2021, 11:33 AM
|
|
Replies: 9
Views: 178
SOVOS Flip down TV SVKTV156A
I tried to attach a picture of power supply ,but it will not upload.
I removed a capacitor off a simlar circuit ,it measured 10uF which suprised me .
Pin 2 of the IC seemed to be the supply voltage...
|
|
Forum: General Electronics Technical Discussion
01-13-2021, 11:13 AM
|
|
Replies: 11
Views: 448
|
|
Forum: General Electronics Technical Discussion
01-13-2021, 04:17 AM
|
|
Replies: 11
Views: 448
Re: 4017 counter reset problem
No the alarm is not can bus ,but I expect the hazard lamps are ,as the lights seem to be controlled by an ECU.
What I did think ,if I changed the output to AC coupled it would not matter if the...
|
|
Forum: General Electronics Technical Discussion
01-13-2021, 04:11 AM
|
|
Replies: 8
Views: 237
Re: Load Testing Audio PA Amplifiers
When I was an engineer we had 1000W RF generators ,these actually American radio transmitters.
We had oil filled dummy loads for testing ,but they were 50 ohms.
You can get devices which are...
|
|
Forum: Troubleshooting TVs and Video Sources
01-11-2021, 10:46 AM
|
|
Replies: 6
Views: 159
Re: SOVOS Flip down TV SVKTV156A
I tried another 12 supply it still shut down.
I think this has been repaired before, the capacitors on the board are normal type and have been glued down .they are far too big ! .
Looked like a...
|
|
Forum: General Electronics Technical Discussion
01-11-2021, 04:54 AM
|
|
Replies: 11
Views: 448
Re: 4017 counter reset problem
Hi not able to get multisim to work at the moment .
Soon as the weather improves I will first check the pusles that come out of the alarm with one of my scopes, sure that it was 5 pulses certainley...
|
|
Forum: Troubleshooting TVs and Video Sources
01-11-2021, 04:41 AM
|
|
Replies: 6
Views: 159
Re: SOVOS Flip down TV SVKTV156A
Hi it is not mains driven ,it has a 12volt power supply , as I am not much up on LCD tvs ,beginning to think it could be the back light.
So I will take a look at that.
Barry
|
|
Forum: General Electronics Technical Discussion
01-10-2021, 07:05 AM
|
|
Replies: 11
Views: 448
4017 counter reset problem
I have been trying to make a counter for my vehicle alarm .I need to reduce the pulses that operate the hazard warning lights.
Because of the ECU you cannot connect directly to the lamps ,so I...
|
|
Forum: Troubleshooting TVs and Video Sources
01-10-2021, 06:38 AM
|
|
Replies: 6
Views: 159
SOVOS Flip down TV SVKTV156A
Hi has any body got any info on this LCD TV?
Something is dragging down the 12V power supply ,looks like a severe overload
thanks
Barry Wilkins
|
|
Forum: Equipment Usage, Soldering, Techniques, and Reviews
09-27-2020, 03:17 PM
|
|
Replies: 1
Views: 572
Faulty DVM
One of my DVMs has gone faulty .
I know why this has happened I was repairing some SMPUs ,they do have some high voltages on the 130volts and 425 volts .It has a range of 1000 volts this is why I...
|
|
Forum: General Electronics Technical Discussion
03-03-2020, 10:29 AM
|
|
Replies: 2
Views: 676
Car Ammeter
After a number of expreiments I gave up the torroid idea.
Could not over come the zero problems ,it has to be the B/H curve the flux in the ferrite does not return to the same point ,so after the...
|
|
Forum: General Electronics Technical Discussion
03-03-2020, 10:12 AM
|
|
Replies: 4
Views: 596
MC34063 Buck Boost
Hi I have trying to make a power supply to give me outputs
Say +10 volts & -10volts from 12 volts.
I have some MC34063 ICs so am using them ,but the circuits do not work ?
Even the one on the...
|
|
Forum: General Electronics Technical Discussion
01-11-2020, 10:42 AM
|
|
Replies: 27
Views: 1,424
|
|
Forum: Troubleshooting Game Consoles & Other Weird Devices
01-11-2020, 10:39 AM
|
|
Replies: 1
Views: 454
Ultrasonic Bath
Circuit for an Ultrawave bath ,the recovery diiode was short circuit.
Barry Wilkins
|
|
Forum: Troubleshooting Audio Equipment
01-06-2020, 09:59 AM
|
|
Replies: 3
Views: 483
|
|
Forum: Troubleshooting Audio Equipment
01-05-2020, 01:31 PM
|
|
Replies: 3
Views: 483
Citreon C3 car radio poor reception
I have a problem with the radio in my car ,its been going on for some time now.
Just poor radio reception,it has got a small aerial at the back of the car .
I can see a nut head holding the aerial...
|
