17PW16.2 Blowing Mains Fuse But Nothing S/C

[ReeceyBurger123]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

Sorry ReeceyBurger123,
The above reply wasn't intended for you. I was replying to someone else but got my threads mixed up and tried to delete it hence the ?

Ohh sorry haha thought you didnt see what I put.

[ReeceyBurger123]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

Looking at the Schematic I am wonder why they have jumpers across the coil like L822 and L821 and a few more,? then I wonder why TR807 has AC Gnd connected to +400 volts? I see three fuses on the schematic, but I figure you are talking about the main input fuse for the AC? Which I can not locate?

I call these frankenstein power supplies, they only add whats needed for the particular screen/Tv. So for a 40" using 250w they dont add the coils and for a 40" using 270w which is likely to put more noise back on the line they add the coils. Its just a total mess of a design adapted for the Tv its used in, the schematic is a total joke.

[tom66]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

I call these frankenstein power supplies, they only add whats needed for the particular screen/Tv. So for a 40" using 250w they dont add the coils and for a 40" using 270w which is likely to put more noise back on the line they add the coils. Its just a total mess of a design adapted for the Tv its used in, the schematic is a total joke.

Yep...about 100 different variations on one schematic. It's frankly disturbing any engineering company could release a schematic that bad, although, they have significantly improved in later schematics. I'm guessing that they had a bad engineering team who were let go, maybe stuck in the CRT era or something crazy.

[ReeceyBurger123]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

Well heres a little progress, not had a chance to look at this much as been out with mates and also sold over 6 Tv's this weekend so had limited time. After disconnecting the output side of the bridge and trying the Psu I confirmed the Ac input side is ok and the bridge is working ok. So the fault is on the SMPMS somewhere will have a poke around later and keep you updated.

[stj]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

bad main cap(s) ?

[ReeceyBurger123]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

I dint think so checked fine esr and cap wise bud.

[stj]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

checked fine with a few V going through it you mean - 360v may make it react differently.

[ReeceyBurger123]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

Hmm maybe might give it a shot and swap it bro. Will let you know, when my solder comes in the post

[stj]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

i'm waiting for a couple of reels myself!
http://www.rapidonline.com/tools-equ...m-100g-50-2442
http://www.rapidonline.com/tools-equ...m-100g-50-2441

so what did you order?

[ReeceyBurger123]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

Just got some ebay cheapo solder, on the other hand mate guess what I thought that the Primary cap was ok in circuit but after snipping it out it has 2.2 ohms Esr and 180uf on it so I think its deffo bad, its one of these shitty TL brand junks its not physically blown though. Im going to change it and resolder the Dc legs of the bridge and see what I get.

[ReeceyBurger123]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

Yeah this cap is fucked ! It gave me 17 ohms then 2.3 then 8 then open going to do a video on it. Something inside it is bad though lol !

[stj]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

put it on the end of an extension cable outside,
then point a camera at it and plug the cable in the wall!!

[ReeceyBurger123]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

This cap is intermittent lol never seen this before, I have done a video will upload when I next render stuff this is mental. In circuit it tested fine then all of a sudden it goes OC then 40ohms then 0.40 ohms wtf. I will blow this fucker up for sure afterwards

[comptek]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

well done bud

[ReeceyBurger123]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

Cheers although it was a disaster. I replaced the cap from a board I salvaged that tested good and resoldered the bridge, then after powering up again the Pfc diode blew and is S/C so possibly got damaged by the old cap I have had this happen before. The fet and controller test ok, so I replaced the Pfc diode and again blew up but now the bridge rectifier is S/C, im unsure why as it was polarised properly too and tested fine before.

Im out of solder atm so going to have to wait on this one lol will keep you posted.

[ReeceyBurger123]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

Well chaps another 17PW16 repair failure, getting sick of this when ever the Pfc on these blows up im never able to fix it ! The bridge some how shorted out after the first Pfc diode blew, so I replaced both Pfc diode and bridge with brand new parts and yet again Pfc diode blew but took the fet out. So I swapped the fet, diode, controller and checked everything else in that section for S/C plugged it in and bang goes my new bridge again. Wtf ? Replaced the bridge and again checked for S/C checked all the resistors and polly caps, everything good. This time it didnt blow anything. Good right ?

Plugged it into the Tv got standby, tried to turn on and bang goes the pfc controller, diode and fet again as soon as the bl kicked in. I checked the cap that I replaced to see if it got damaged but its 100% fine so I desoldered it and out the window into the bin went this pile of shit Psu

I also have just got a 17PW20 with blown Pfc probably will end up the same as this though but will give it a shot, might make a thread. Thanks for the input though chaps, and if any one beats the Pfc section meltdown one on of these PLEASE tell us all how to

[budm]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

The PFC controller drive output to MOSFET probably stuck HIGH instead of switching on and off.

[ReeceyBurger123]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

But it was replaced with a brand new one bud, and I checked its feedback resistors and they were fine. God knows what causes these to break down as they do but I dont have the time or effort to repair it a replacement is cheap enough on ebay so will just change it

[stj]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

that's why i like tv's with a 12v input and external brick.

[ReeceyBurger123]

Re: 17PW16.2 Blowing Mains Fuse But Nothing S/C

that's why i like tv's with a 12v input and external brick.

Yep nice and simple lol