Re: Using a 240vac to 12vac transformer to test for shorts?
That I don't know sorry. But my new answer I just posted may answer that?
i.e. The motor works on another separate power board without tripping.
I think the heat gun had a wire shorting but I just fixed that....
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Re: Using a 240vac to 12vac transformer to test for shorts?
OK, Well done all.
Took the motor into the garage and it didn't trip the circuit breaker so will sort that.
Opening the heat gun further to measure resistance as I couldn't figure out the wiring. There is 5 going into to where the element is, for the different temperatures I guess. One of those had broken at the connector. That is working fine now I've reconnected it. Although 1 out of four settings is not working so will look further.
I have a 75 watt flood light bulb for a...
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Using a 240vac to 12vac transformer to test for shorts?
Shorting devices I want to test
1. Heat Gun
2. AC Electric Motor (not sure if it is the motor so just want to test that directly)
Hi There
The two above devices trip a circuit breaker when I plug them into a wall.
I was wondering if it would be feasible to use a 240vac to 12vac transformer to power the devices to do a bit of testing etc, making it safer and to keep the circuit breaker from stopping the power getting cut off?
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Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board
I am an ameteur so I will just ask some questions to get our troubleshooting juices flowing while we wait for the experts.
"...the TV doesn't start."
does the set move out of standby with the remote but the screen does not show anything and there is no sound or nothing happens.
"...all the voltages are present and correct."
Does that include the other connecters like the 60v inverters on LA_R and LA_L, and the 12v etc.
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Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board
I have found the answer to my question immediately above.
I have a copy of Justine Youngs Troubleshooting and repairing switch mode power supplies which I am reading through.
He explains that there is one or more high Ohm startup resistor between the primary 300VDC caps of and the power IC. If this shorts or opens it will cause No-Power problems and sometimes intermittent power problems.Last edited by i-didnt-start-the-fire; 09-11-2018, 01:47 PM.
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Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board
My other question is hard to word and may be hard to answer because of this.
I want to know how you worked it out.
There was low resistence on the ENUV PIN. I would have come to the conclution that the resistance through the IC was bad.
You knew there was something else on the board that was lowering the resistance.
I know this is probably electronics basics to some but it was enlightening.
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Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board
I pulled 6 little orange and black diodes off another board to solder one in thinking they were all the same
Did I mention I am a novice...
But decided to zoom in with a photo to see if there were any markings and noticed the one I removed was marked with TZX 15B
I checked the others 3v3 6v8 16B
I was going to ask here if I could use the 16B, but decided to just put the 16v in. It worked What the potential issues with this decision?
Do you think I need to change this diode to 15v or...
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Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board
Thanks BUDM!!!
This thread helped me fix my SHARP LC-46D77X Power Board DPS-286AP-1 A - a few notes here for people that search for this model
Symptoms: no power at all not even the Standby light.
I bought a replacement kit from ebay that didn't cover my model of TV but the IC as explained by Tom66 in the second post of this thread could be used so I thought I had nothing to loose. It was to be used as spare parts if this didn't work.
The IC7905 had physically blown its top off, so I replaced...
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