mag 2200w lcd wont power on

[alick]

Re: mag 2200w lcd wont power on

no he just looked at it and show it to another person and they both said i dont need the caps they are fine. the other guy from the tv store said the same thing about the caps. I think I should just get a mulitmeter and test everything myself that way i know what is good and what is not. I just dont wanna remove the caps if they are infact good still. they look almost new
ps: he tested the fuse and they where both fine.

[sabre504]

Re: mag 2200w lcd wont power on

Well i am not knocking them but you cannot tell if a cap is any good or not just by looking they could be out of range in capacitence or out of range on ESR .
You need an ESR meter to test them for ESR but they are expensive unless you do it for a living .
With the heat you have had around the board they may well have dried out
which again will cause them to fail.

If you read through a few threads there are a lot of guys on here who have been doing it longer and have much more experience than i do who will tell you the same thing maybe one of them will look in and comment as i may have missed something .
In my opinion for the sake of very little money that it will cost for new caps i would replace them anyway as they have been on the board from day one and are probably no good anymore .

When caps fail they cause the voltages to go astray and hence cause problems like burning out other parts ie the mosfets .

Sorry dont want to sound like i am giving you a lecture just trying to steer you the right way

[alick]

Re: mag 2200w lcd wont power on

no no don't be sorry, I don't mind, its all learning to me.
I will go get the caps too and just replace em all so it eliminate the possibly of them being bad. i guess i should get a new solder iron and kit as well.
thx

I will updated you after i get the parts and give it a go. I have to wait until monday to order them from the parts store and wont get them until friday most likely

[sabre504]

Re: mag 2200w lcd wont power on

Ok just make sure they are low esr

[retiredcaps]

Re: mag 2200w lcd wont power on

no he just looked at it and show it to another person and they both said i dont need the caps they are fine.

Looking at caps without testing them and saying they are fine is like looking at a 9V battery that has been USED in a smoke detector for a 2 years and saying the 9V battery is fine for another 2 years.

[retiredcaps]

Re: mag 2200w lcd wont power on

If you have a multimeter you can test the transformers i have taken the following from Retiredcaps 2 seconds to black guide (might be worth reading the whole thing if you have not already done so

Here is the "short cut" version. Measure the resistance between the 2 red dots. Report findings. Do the same for the yellow dots.

[alick]

Re: mag 2200w lcd wont power on

which of those multimeter will do the job? I have to pick on up tomorrow. also I trying to keep my budget under $45 if possible?
http://www.leeselectronic.com/ will that one for $18 do it?

[sabre504]

Re: mag 2200w lcd wont power on

That will get you started

[alick]

Re: mag 2200w lcd wont power on

Ok then my plan is set. Thx

[alick]

Re: mag 2200w lcd wont power on

do you think this one will do??
http://www.mainelectronics.com/UT20B.html

[retiredcaps]

Re: mag 2200w lcd wont power on

do you think this one will do??
http://www.mainelectronics.com/UT20B.html

If you can wait, Canadian Tire has this multimeter Product #52-0052-2

http://www.canadiantire.ca/AST/brows....jsp?locale=en

normally for 70% off (or $18 CDN on sale). They frequently have 70% off sales every 3 to 4 weeks.

I have used its earlier incarnation and it is decent for $20.

If more USA ebay sellers shipped multimeters to Canada, there is a lot of selection for good quality used multimeters (like Fluke, Amprobe, GreenLee, Meterman, UEI, Ideal) for $20.

I managed to find 2 Fluke multimeters locally (kijiji, craigslist) for $20 and $30.

In the end, it is your call. The Uni-T will work fine for basic measurements.

[sabre504]

Re: mag 2200w lcd wont power on

Well its got the functions you need so will do

[alick]

Re: mag 2200w lcd wont power on

Ok. Hmm maybe what I will do is get the cheap one now and get the other one once it goes on sale. Its good to know Canadian tire would have been the last place I would have looked

[smason]

Re: mag 2200w lcd wont power on

Also Princess Auto has some cheap ones.
I use a cheap Princess Auto $12.00 powerfist special for general use at work (checking P.S. and wall wart output, continuity checks etc) and it does all I need.

[alick]

Re: mag 2200w lcd wont power on

ok guys I got the mosfet in and while i was de-soldering them the first one came off without really any problem. the second one both leads broke off while i was attempting to use twizer and de-solder them. after placing them in and hooking everything up its still does that but now the picture come on for a second then off. I guess the next thing is to change the caps. I will need to see if i can find any cause the stores i went to had some but they are way to big. anyways i will keep posted!

[jetadm123]

Re: mag 2200w lcd wont power on

Before replacing caps, I suggest you perform retiredcaps test on post #26 before you go any further.

[alick]

Re: mag 2200w lcd wont power on

ok so i measure those two the red and the yellow and they both are at 768 on the resistances. the metere was seT to 2000 was I doing it right? and is that reading ok or is there something wrong?

[alick]

Re: mag 2200w lcd wont power on

http://www.shopjimmy.com/mirage-860-...t-inverter.htm will this board here work as a replacement???
or
http://www.shopjimmy.com/860-ab0-190...t-inverter.htm

[alick]

Re: mag 2200w lcd wont power on

i found that transformers but i think I might just get the board instead. and maybe just use the old board for parts and to tinker with?
http://cgi.ebay.com/2X-TRANSFORMER-7...091450#vi-desc

[alick]

Re: mag 2200w lcd wont power on

http://www.shopjimmy.com/860-ab0-190...t-inverter.htm this one is the right one??