Re: Samsung UN55B8000F Mainboard Issue(Relay Clicking Issue)-Help!!
Wish I could help. Won't be the first time someone helps you along and then falls off somewhere. Although, Bud is probably busy helping someone else.
Ashroyer05
Senior Member
Last Activity: 04-01-2014, 04:41 PM
Joined: 09-20-2013
Location: Greensburg, pa
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Re: toshiba 37x3030D power up issue
If you have time I would just send $20 on ebay for a ccfl tester. You can make them too if you youtube it. This will help you narrow if one of the two is bad.Leave a comment:
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Re: Not getting voltages CMP4121HDU
New info. The filter caps sit around 7 volts until the board energizes, then the caps go up to 300+ until the board de-energizes. One pin goes up and then settles to around 5.9V and then to around .6V when the board de energizes. So I disconnected all ribbons/cables and jumped a 5V pin to the pin that gets 5.9 When the circuit energizes but this did not force the supply on.Leave a comment:
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Not getting voltages CMP4121HDU
I want to start fresh with a post on this tv. For all of you who know your stuff this will be a challenge. I'm wondering if just maybe with some various input from people if maybe we can solve this problem. There are no schematics out there for this tv. It is an older Hitachi plasma.
Voltages I need:
3.3V
5V
75-90V
50-70V
Voltages I have:
3.3V
4.55V
5.96V
1-2V Present where the higher voltages should be.
Turn the power on here the relays click and board energize. About 3-5 Seconds later the board de-energizes... -
Re: Cap exploded...help required. Philips LCD 42PFL5404H/05
There is no C502 on the board I have. Can you send me a pic of the board where it would be. Also give me the number of the component. I know when I replaced the varistor I couldn't find an exact I had to get something close as I could. Maybe with a cap go bigger to be safe. But lets see first.Leave a comment:
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Re: Cap exploded...help required. Philips LCD 42PFL5404H/05
ok. I will try to look at the board tonight after work or tomorrow. Maybe we'll get lucky.Leave a comment:
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Re: Cap exploded...help required. Philips LCD 42PFL5404H/05
Also, I have a 32PFL power supply at the house right now. I haven't read enough into your post to see what you're trying to figure out though. Do you need a part number?Leave a comment:
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Re: Cap exploded...help required. Philips LCD 42PFL5404H/05
The first tv I worked on would not power on. Not knowing anything about tvs at the time I took the cover off and plugged it in after looking for visual damage. After trying to turn it on a couple times I blew a hole through the varistor. It looked just like your cap there. I haven't been this lucky since with that sort of thing but After I replaced it the tv works fine and has worked for the last year and a half.Leave a comment:
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Re: si 3033c Same inputs different outs?
I actually think it's SK. Sanken? But they only show me a 3 pin ic. Could Vos cause the voltage to be different? But if it is compatible with SI the output doesn't look like it should go near 5V.Leave a comment:
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si 3033c Same inputs different outs?
I have a regulator SR3033c and Si3033c is the only thing I could find info on. I hope they're compatible. My question is: if I have roughly 6 volts going in to both can one have 3.3 for a vout and one have 5 for a vout? When I say both I mean that I have two sr3033c's and they're both on the same board.
[url]http://html.alldatasheet.com/html-pdf/38256/SANKEN/SI-3033C/743/4/SI-3033C.html[/url]https://I have a regulator SR3033c a...3.3 for a vout -
Re: rectification in smps
Its mainly this power supply that's confusing me. I've worked on a few but this one is like a city. All the transformers confuse me. Say i needed 50dc output and 12dc and the typical standby of 3.3 or 5. Does each transformer supply each of the voltages? I took electronics but i grew up in a mechanics home so yes i have a lot of basics to learn or relearn in electronics but im willing. In college my professor had a hard time explaining things to me as well As he understands electronics to the nth degree and its something i came into blindly. I have learned...Leave a comment:
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Re: rectification in smps
Marius, I just read back through the comments here and noticed them. I will read them and thank you for the info.Leave a comment:
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Re: rectification in smps
Hansson, i post because people give answers and don't check back or they give answers like my past instructor who was an engineer and couldnt comprehend my simplistic questions. I have already read most of the links you sent me (thanks by the way) but they all lack the answer im looking for.Leave a comment:
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Re: rectification in smps
What is a single ended flyback?Leave a comment:
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Re: Psu Transformer operation?
715T2190 is the board.Leave a comment:
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Psu Transformer operation?
I uploaded a picture of what seems to be a pretty "simple power supply." I removed the transformer just to experiment as the board is completely fried. Where the secondary windings of the transformer go I put in a red oval. The transistor which I think controls it is in a red circle. The anode of the transistor ([url]http://html.alldatasheet.com/html-pdf/19758/PHILIPS/TL431C/495/2/TL431C.html[/url]) is connected the secondaries. My biggest misunderstanding here with this and other power supplies is why are all the secondary pins common to ground? Is it only until the transistor turns... -
Re: rectification in smps
How could a transformer run off dc since the ac is rectified first.Leave a comment:
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Re: rectification in smps
do we power the transformer with pulsing dc in smps?Leave a comment:
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Re: How the smps goes into full mode?
Thanks bud, I'm still studying the diagram.Leave a comment:
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smps transformer
in standby does the main transformer run? If so does the transformer put out more voltage when the smps is in full operation?
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