onkyo tx sr507:
Had it a long while, been through a lot and dont have funds for new one.
Found a nice schematic. All tho I am not the best at reading it.
I don't know all my components or how to test them. I do have a nice soldering setup and a alright DMM. could make a make shift bench top psu if need be.
Short of it:
It went in to protect mode aka blinking light. I turned it back on, smoke came up from PSU area. Fuses blown.
Was it the fuses that smoked?
looked it over, got new fuses. they went bad too....
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Need help, fixing onkyo tx sr507, bad channel, blown fuse.
Last edited by cwolford; 12-01-2017, 02:41 AM.
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Re: Phihips 47pfl5704d / f7 Back light not working
seems i did not kill that MosFet the holes in the the pcb have the measurements with our with out the Mosfet.
Seems that mosfet is bad to seeing its all 0L yea? If anyone know of anything else i should check because of the bad mosfet plz let me know.
thanks
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Re: Phihips 47pfl5704d / f7 Back light not working
so i'm not even %50 sure, but based on what i have come to understand from chatting here and the spec sheets.
The circuit applys voltage to the gate of the mosfet to control it
That voltage should be 10v, but no more than 30v right?
Next
The source should be ground and then the drain seems to be the voltage from the 450v caps.
So I should be able to test to make sure there is ground at the source, 10-30v at the gate, and cap voltage of at the drain?
...
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Re: Help finding mosfet interchange
Seems the one mouser cross referenced seems bang on all for ID
original= 5A
mouser cross referenced = 4.4A
How big of deal is this?
thanks
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Re: Phihips 47pfl5704d / f7 Back light not working
See i know a circuit will only pull the amps it needs. I also knew that the resistance had to be near the same, anyone know how much wiggle room i have?
What i dont get is the voltage for the gate / drain. I know there is wiggle room but Too much cause heat and part blow, too little is bad too the meaning of brown out, not sure what this does tho.
thanks for the replysLast edited by cwolford; 03-08-2017, 01:13 PM.
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Help finding mosfet interchange
I have some bad, KHB 5D0N50f If you need the other numbers i can get them, but i think there production run numbers.
I think this is the data sheet :
So i dont know how to find a good replacement.
I typed it in to mouser and It gave me STF5N52K3
its data sheet:
[url]https://cdn.badcaps-static.com/pdfs/bf62fc7e8be25af29b2ea21d17453f57.pdf[/url]
seems they are out but digi-key has them
[url]http://www.digikey.com/products/en?keywords=STF5N52K3[/url].
Im still new to all this and not sure how close the...
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Re: Phihips 47pfl5704d / f7 Back light not working
So I got to thinking to find the rest of the circuit as i dont have a diagram, I can just use the PCB traces and dmm to track it from the bad Mosfet. Is there anything hidden between the layers of PCB or should i beable to track by eye and maybe the help of the dmm?
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Re: Phihips 47pfl5704d / f7 Back light not working
I removed q706 and q707 with the heat sink as I could not remove screws at that angle. Q706 same measurements. Q707 all I got was 0L on all measurements.
I know how to solder I was in and out quick NP all went easy, I don't think I killed it. What gives
also was wearing esd strapLast edited by cwolford; 03-06-2017, 11:01 PM.
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Re: Phihips 47pfl5704d / f7 Back light not working
I will remove it soon and retest. All the diodes seem to test good and all the other transistors on the broad seem ok.
Anyone know of a place in USA to buy a replacement so i don have to get the whole repair kit.
I have used mouser and digikey and ebay but Seems the KEC KHB 5D0N50f is old. I dont know how to find a new one that will have the same specs.
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Re: Phihips 47pfl5704d / f7 Back light not working
Like i said I dont know a lot, but Seems I have a bad MOSFET.
KHB 5D0N50f
all of them Q706-q709 have same readings but q706
q706
1 to 2= 14.92 ohms
1 to 3= 2.109k ohms
2 to 3= 2.116k ohms
q707, q708, q709
1 to 2 = .3190k ohms
1 to 3 = cant get a lock DMM is seeking down from 20M ohms
2 to 3 =Cant get a lock DMM is seeking down from 15M ohms
Since this are the same somebody is bad. the question is who, then why.
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Re: Phihips 47pfl5704d / f7 Back light not working
using retiredcaps tuts i'm doing some measurements. Here is T701 backlight
here is the print on it:
2130kp029c-f
gl 47 fhd
ny091106b
here is the measurements
1 to 2= 1.04 ohms
1 to 3, 4, 5, 6= 0L seems to not measure at all
2 to 3, 4, 5, 6= 0L seems to not measure at all
3 to 4=23.94 ohms
3 to 5=67.95 ohms
3 to 6=91.89 ohms
4 to 5=44.1 ohms
4 to 6=68.05 ohms
5 to 6=24.05 ohms...
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Re: Help using dmm safety
Going to read it now. I have no clue what is part of he back light circuit. I will test what I am pointed at or replace the parts etc. I don't have the skill yet to know how to track down all the things in that circuit.
I am grateful for people like you. Thank you so much....
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Re: Help using dmm safety
So thanks for the info, a lot to take in. I know better than to just start messing around, I have had a few class in the matter.
So I need to test a transform for a back light issue, and my kids keep me from browsing the net for days on end finding good info for diy. Any one know of a good dig high voltage prob?
I assume I can make it and test it on 100v or 200v to make sure it work right.
Never thought about a voltage shunt. That's basically what it is right. Like when you need to measure amps?
Thanks...
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Re: Help using dmm safety
"If you measure high voltage (i.e. > 50V) on a regular basis, get a set of grabbers or pinchers so you can measure hands free."
I assume one would hook up ever thing to take the measurement with the grabbers, then setup dmm then kick on the circuit?
Never thought about this lol. Thanks I will get a set.
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Help using dmm safety
I has some electronics exp. My dmm uni-t UT61E
Its manual [url]http://www.uni-trend.com/productsdetail.aspx?ProductsID=605&ProductsCateId=743&CateId=743[/url]
So can this dmm be used to read volts over 1000v?
I have done so with 500v caps, but nothing @ or over 500v.
Will it break dmm? Can my test leads keep the voltage from zaping me?
Thanks for your time
Link to pdf
[url]https://drive.google.com/file/d/0B4Jyby-tjH5oTUFhWVRuQjdoVEk/view[/url]
See page 6 and 16I has some electronics exp. My dmm uni-t...Last edited by cwolford; 03-04-2017, 06:30 PM.
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