Re: EPCOS SMPS Transformer substitute
Ah ha, just stumbed over an .xps to pdf converter that seems to do a nice job. So here is the schmeatic devloped so far, around the power switcher LNK363.
I also found older top view of the complete power board (there is another nasty complicated microprocessor board associated, hope not having to deal with this)
Icludes the X-ray of the tracks side where I have been working at annotating.
[SIZE="5"][B]Warning: very likely not correct as I was struggling more with my ECAD software at the...
starling22
Member
Last Activity: 10-02-2018, 05:39 PM
Joined: 02-15-2017
Location: Burnie Tasmania
-
Re: EPCOS SMPS Transformer substitute
Yes the negative supplies I find a bit confusing. I should not be confused but am so used to just seeing positive.
As the switching runs at a nominel 120 kHz, I think I got that from the specsheets of the LNK363.
The need for some fast/ultra fast switching diodes, identified as
2DD101 UF1006 0519 800V / 75ns
[url]https://au.mouser.com/ProductDetail/Diodes-Incorporated/UF1006-T?qs=%2fha2pyFaduhAogcU1SkpV77pCwduDkaXbtsdVN7mcwI%3d[/url]
2DD102 SB140 0369
[url]https://au.mouser.com/Semiconductors/_/N-5gcb?Keyword=SB140&FS=True[/url]...Leave a comment:
-
Re: EPCOS SMPS Transformer substitute
After some sweating and headache, the power supply section around the LNK363 I believe have been decoded, a schmatic and overlay produced.glk. This is now being used to check out and see what will happen next when the chip gets replaced.
Will attach schematic and overlay for the power supply section only at this stage. There is a jpeg and a windows xps file with good resolution of the schematic
xps file not on allowed list, will have to see what I can do, pdf version is not too god....Leave a comment:
-
Re: EPCOS SMPS Transformer substitute
Go to this website and look for some reference designs with the LNK363:
[url]https://www.power.com/search/site/linkswitch-xt/[/url]
Depends on what you need and surroundings, in this case enough I should think but I am yet to find out what voltage it is running at or should be running at.
Enough as there is not really any evidence of long term overheating.Re: EPCOS SMPS Transformer substitut... LNK363:<br />Leave a comment:
-
Re: EPCOS SMPS Transformer substitute
The details of being superceded I got from the manufacurers site when looking up details on the XT and found it was now XT2, I did not take notice of the time the new line was in sales.Leave a comment:
-
Re: EPCOS SMPS Transformer substitute
Yes I agree it looks straight forward but .... At this stage I do not need help apart from I would like to identify that transformer, no matter what.
For one to put in my ECAD schematic and second to see if it is one of those specially designed ones with extra screening or whatever the talk is in the LNK363 pdf file.
I have found out that the LinkSwitch-XT family has been superseded by the LinkSwitch-XT2, where there is an very obvious rearrangement of the die making it not direct replacement. Roughly described...Last edited by starling22; 09-15-2018, 12:01 AM.Leave a comment:
-
Re: EPCOS SMPS Transformer substitute
The post is getting a bit on in time but I have got involved in the similar board out of a washing machine. The evidence is similar but a bit more pronounced with the LNK chip cracked and some dark dust around.
Working around the components and tracing the diagram in this area, a bit laboriously but I am curious.
Just wondering what did happen her in the thread, just getting interesting then no more posts??Leave a comment:
-
Re: Viewsonic VA1912wb-4 after replace cap still not working
Just of curiosity, what happened hear? success
I am just starting to look at my va1912wb which has symptombs of capacitor problems, takes long time to turn on and clicking sound with flashing green light.Last edited by starling22; 05-15-2018, 06:18 PM.Leave a comment:
-
Re: laptop hp dv6-3132 dead, no lights at all
While waiting on replacement MOSfets I wondered about on the net and took an interest in trying to see if I could locate a "boardview" for the hp dv6-3132 laptop.
It seemed harder than expected. I have downloaded "Openboardview" and a random boardview. Playing around with this.
Yesterday I believe I got very close to finding a boardview, I made a note too somewhere but failed to find it again today.
google: "QUANTA LX6-LX7 DA0LX6MB6H1 HP liverpool boardview"...Leave a comment:
-
Re: laptop hp dv6-3132 dead, no lights at all
Ok, I understand perfectly. The risk is too high that something will go wrong and it will be wasted effort. I will have enough trouble trying to solder in the ICs, this exercise will do as far as creating problems this time.
I will buy one set off the internet and the other from RS-Australia.
If I stumble over a website(s) that look at these things in depth I will listen in out of curiosity.
Leave a comment:
-
Re: laptop hp dv6-3132 dead, no lights at all
RS here in Australia carry the FDMS7692 MOSFET but not the FDMS0310 but they do have another FDMS037N08B which in most respects seems more rugged. I am tempted to buy that. Buying from RS is good insurance against getting low quality from internet.
Capacitance and min Vgs (Gate-Source) voltage is approx 1V higher I do wonder if that is important enough to dismiss it. I will attach data for both....Leave a comment:
-
Re: laptop hp dv6-3132 dead, no lights at all
Been slightly sidetracked fixing up lighting and making room in my workshop in preparation for attempting SMC work. I had an old Intel motherboard about 10 years old I guess. Starting practicing removing components.
First go removing a small 8 pin device, I had too fast air stream as I blew away a small component when the chip came away. I may have shaken my hand when grabbing the chip with my tweezers. Removing components I will be able to do. Soldering them back again will take me some time to practice as I notice that...Last edited by starling22; 09-14-2017, 07:16 AM.Leave a comment:
-
Re: laptop hp dv6-3132 dead, no lights at all
As I find it odd that those 8 chips should go. Of course at this stage I do not know if more components are dead. These eight did get hot when about 10W power or more was applied.
You have me a bit concerned about the cpu I should have dismantled this earlier as well. I understand that if I had applied external power to the location where PD23 is, say on a good motherboard, with my method the cpu might be damaged.
In my case the lowest voltage setting I would have applied is 2.7V both for my 'low power'...Leave a comment:
-
Re: laptop hp dv6-3132 dead, no lights at all
I made up a resistor of 3 resistors, 1 ohm wirewound 7W, in parallel. They were placed in the airstream from the sizeable fan exhausting at the rear of my power supply. I found out that I needed a lot of power to make anything warm.
The mobo still had the processor and fan installed up till now. When I applied power accross the PD23 (careful with polarity) I had trouble sensing anything getting hot. Kept increasing the power.
When applying 20W power I noticed the heatsink over the processor, with an outrigger...Last edited by starling22; 09-11-2017, 04:24 AM.Leave a comment:
-
Re: laptop hp dv6-3132 dead, no lights at all
I agree I will have to get my heavy dude, 30V-20A variable supply off the shelf and use a 1 ohm 50W power supply or similar.Leave a comment:
-
Re: laptop hp dv6-3132 dead, no lights at all
I have spent time making a component identification map to help me manage what I have identified. Getting back to troubleshoot.
When I apply power I find that PQ42, which is OFF, preventing +VIN. While it is off some current must be passing because it does get hot to the touch after a 1 to 2 minutes. The longer power is on the a greater area around the device also gets warm to the touch.
I have got my power supply set to 3.2V, lowest I can go and set a current limit of 400mA. Applying power to the Cathode of...Last edited by starling22; 09-10-2017, 08:09 PM.Leave a comment:
-
Re: laptop hp dv6-3132 dead, no lights at all
Sorry about the picture missing, I think I got sidetracked looking for a really good picture of my motherboard so I can annotate the bigger components. A few days away from this work and I have forgotten where I got to, I put it down to old age.
Yes good point about keeping an eye on the current consumption. I have just had power on the board and measured 96-100 deg F, somehow I managed to change mode from deg C and forgotten how to change it back.
The board area that hots up now attached.
...Leave a comment:
-
Re: laptop hp dv6-3132 dead, no lights at all
I have been counting capacitors on the +VIN rail, it amounts up. Well with a short on the board and heating up near the power entry it narrows the area a bit.
Basically the area on the picture attached here gets up to about 40 deg C, hot to the touch but no specific component.
Will get my little infrared temperature indicator out an try and see if this can pick a hot spot, small sensing area on the unit. The generated heat may of course not be due to the short either.
I have a variable power supply...Leave a comment:
-
Re: laptop hp dv6-3132 dead, no lights at all
[B]piernov[/B]
Well, I almost fell in the trap os saying yes I had but when I looked in my notes I could not find any record so I repeated a conductivity check near +VIN.
There is a diode of some sort, I don't think it is an ordinary diode. Designated PD23 a P4SMAJ20A. I found data sheet and attached copy looks like being a transorb or ? whatever. Initially I seemed to get diode behaviour but I went back and repositioned the board so I could get a bit more force on my needle probes. "Shorted diode".
...Last edited by starling22; 09-07-2017, 11:39 PM. Reason: PD23 initial measurements were wrong, correctedLeave a comment:
-
Re: laptop hp dv6-3132 dead, no lights at all
Great tip for me about the '*' meaning things may be missing. I think you are right PU2 is nonexistent. You mentioned PU8 was generating HV28, based on counting the pins this is a 20 pin IC so using this as starting point I located the P2806, attached picture.
It is midnight here so I am struggling with lighting tonight making identification difficult. I have annotated what I think is pin 17, VOUT and the other arrow shows top of a capacitor where I measured +29V. On the right diode footprint, empty by the way, I measured...Leave a comment:
No activity results to display
Leave a comment: