42inch Touch Screen wont power on
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Re: 42inch Touch Screen wont power on
1-2 open
2-1 ~0.2V
2-3 ~0.2V
3-2 open
3-1 open
1-3 open
It depends on the type of diode (schottky, fast recovery, and if it's a dual package); I can't see the part #s.
If any reading shows 0V, the diode is almost certainly bad.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: 42inch Touch Screen wont power on
Don't let the physical packaging fool you. It is best to go by the pcb designator and look at the component part number and find its datasheet.
Also, it is a mosfet.
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Re: 42inch Touch Screen wont power on
I shall check all of this once i get home from work but i do have a question.
These diodes i am checking are located next to the caps that do not have power on the cold side, however we seem to be not gaining the correct voltage to the caps further back on the hot side?
Wouldn't this mean the problem is further back or are we working from one end to the other to see if anything has shorted further on from the initial problem?
(just trying to work out how we work process of elimination)Comment
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Re: 42inch Touch Screen wont power on
They are labled D704 etc etc for all the ones listed.
thye are 3pins
1-2 = 0.162 v
1-3 = 0v
2-3 = 0.162 v
However the big white risistor labled r100JSMT mpr -5W and marking on board r601 locaded near the big cap reads .4 ohmsComment
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Re: 42inch Touch Screen wont power on
All of them read this
i started with red on pin one then reversed, should this be done the other way?
1-2 .112V (made a click)
2-1 .162V
2-3 .162V
3-2 111
3-1 0v
1-3 0vComment
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Re: 42inch Touch Screen wont power on
Hmm, these readings suggest they are all bad. I would desolder one of these diodes and retest out of circuit. In-circuit readings are inconclusive since other components can be affecting the readings.--- begin sig file ---
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Re: 42inch Touch Screen wont power on
Post a picture of the diode, or read off the part number.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
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Re: 42inch Touch Screen wont power on
1-2 .195v red pin 1 black pin 2
2-1 0V black pin 1 red pin 2
2-3 0 red pin 2 black pin 3
3-2 .197 black pin 2 red pin 3
3-1 0 red pin3 black pin 1
1-3 0 red pin 1 black pin 3
->|-|<- B1861 F15JC10Comment
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Re: 42inch Touch Screen wont power on
Is it 0V or 0L? There is a huge difference between the two.--- begin sig file ---
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Re: 42inch Touch Screen wont power on
Let's try a test too - what reading to you get if you set your meter to diode test mode, but don't connect the probes to anything? In other words, an open circuit. I'm worried you might be confusing 0L or "1 ." for a zero.
edit: oops 1 minute too late!Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: 42inch Touch Screen wont power on
Thanks for the part number, and it's nice the manufacturer has included a marking of polarity. That indicates a diode drop should be between middle pin and each other pin, with the black terminal on the middle pin.
Let's try a test too - what reading to you get if you set your meter to diode test mode, but don't connect the probes to anything? In other words, an open circuit. I'm worried you might be confusing 0L or "1 ." for a zero.
edit: oops 1 minute too late!
open .0L closed 0 volts ? is that right shouldnt it read the voltage of the battery?
and yes lol it is .0L i am reading sorry guys
so this means it is functioning correctlyLast edited by epicfatigue; 12-08-2011, 03:13 PM.Comment
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Re: 42inch Touch Screen wont power on
Yes, those readings indicate a functional diode. Now test the other diodes. No need to post more results unless you are unsure of the reading or if you are getting odd readings. We are looking for a diode which is not behaving properly.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: 42inch Touch Screen wont power on
the white paste on these its this just thermal paste?Comment
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Re: 42inch Touch Screen wont power on
Yes, the white stuff is thermal paste. If you replace a diode, I recommend you add some more paste (any stuff will do, you can buy it off eBay.)Last edited by tom66; 12-08-2011, 04:17 PM.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: 42inch Touch Screen wont power on
kool, and is it thermal paste on these? or do i need to go out and buy something special?
Also is it possible this chip we were looking for is mounted on the small heatsink?
As it is a 6 prong i will try and get the part number off it but it is labled as an ICComment
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Re: 42inch Touch Screen wont power on
Yes, the white stuff is the thermal paste. If the paste isn't smudged, then you might not need some more paste, but I'd recommend it anyway. Here is something that will work: http://www.ebay.co.uk/itm/CPU-Therma...item3f10fcf53e
Get two or three, as one of those tubes doesn't last long.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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