LG Plasma 50PC1DR- Y-SUS Issues

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

tom66, i paid 20$ each at a local recycler !!! i bought 5 total for 100$.
one had a broken screen, i salvaged the boards. 2 are fixed, one is work in progress, and the 4th one is waiting for the STK from china (42incher).

I had fun with these, took time but it'll get easier when i buy a few more. thanks for the help tom66. im not a tv tech at all, but an IT guy doing tech support/install and networking.

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Well, two TVs would be great I'm sure, a third could only be a bonus. How much did you pay for them. I need money as a student!

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Oh, sorry. Okay..

http://www.digikey.ca/product-detail...DICT-ND/770117

here it is anyway I got some buffer chips coming from either usa or china (if that american guy answers i'd be glad to buy from US.. argh)

thanks tom66, maybe i'm saving that buffer at last. hell, i'll have 3 working tv's by today when digikey comes deliver those caps and such.

just need a buffer chip, but i'll see if everything works by having half of the tv on.

Link did not work, That PDF was my best guess but they look like normal diodes. Like TOM said won't hurt to go higher in voltage as long as the current is correct.

[tw2005]

Re: LG Plasma 50PC1DR- Y-SUS Issues

so this

http://www.digikey.ca/scripts/DKSear...37318049910314

would be fine ? its rated 5a, but otherwise seems ok

Link did not work, That PDF was my best guess but they look like normal diodes. Like TOM said won't hurt to go higher in voltage as long as the current is correct.

[tw2005]

Re: LG Plasma 50PC1DR- Y-SUS Issues

i got them from utsource.net, they are sanyo's SPI-50X3E120 not lg's yppd's.
bought from aliexpress, they also sell on ebay as utsource
they were very used to start with, but hell i got 2 working now.
next time im buying some new sanyo's not used.
did you check a lotta things before you installed the j016's ? like make sure buffers were not shorted, that everything was clean on the ysus zsus ?

im surprised it killed the j016 that bad, we can see the burns clearly, there must be some shorts elsewhere

// edit.. what do you mean the first gnd is open ?

It was the J015(new) that went bang. Double and triple checked, no shorts(unless I bridged something on install?). The set was working, swapped this board in for testing. Ran the ysus up with no IPMs and checked the voltages, all seemed ok and no smoke. Took a brave pill and removed the IPMs from the ZSUS I got working and this ysus board is now functional.
Can only assume my error or dud IPMs.

Have purchased other semiconductors from UTSOURCE, no probs but I don't like the idea of used or refurbished modules.

Got the J015 from UTBARN but I think I'll try again with 2 new modules from a guy in Malaysia. A little bit dearer but advertised as new.

If they go bang then I'll know it was bad parts as the ZSUS was in use until I took the IPMs out of it. I'll call it quits if they do fail, just burning $$$.

Very few of these for sale here now broken. I think most have expired and been dumped by most due to the expense of repair given what you can get new fairly cheap now.

Not the best picture on these LGs but the sound on this is awesome.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

so this

http://www.digikey.ca/scripts/DKSear...37318049910314

would be fine ? its rated 5a, but otherwise seems ok

Just follow straight under S4A for the specs.

Type Number Symbol S4A
Maximum Recurrent Peak Reverse Voltage VRRM 50
Maximum RMS Voltage VRMS 35
Maximum DC Blocking Voltage VDC 50

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

i got them from utsource.net, they are sanyo's SPI-50X3E120 not lg's yppd's.
bought from aliexpress, they also sell on ebay as utsource
they were very used to start with, but hell i got 2 working now.
next time im buying some new sanyo's not used.
did you check a lotta things before you installed the j016's ? like make sure buffers were not shorted, that everything was clean on the ysus zsus ?

im surprised it killed the j016 that bad, we can see the burns clearly, there must be some shorts elsewhere

// edit.. what do you mean the first gnd is open ?

[tw2005]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Can you tell me where you got the bad modules from? I got mine from Hong Kong on Ebay but the seller only has refurbished J016B, no new. The J015B was new.

[tw2005]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Hi tw2005, where do you see that? In the pdf, i see 4a for any voltage rating
I might be looking st the wrong place

Just follow straight under S4A for the specs.

Type Number Symbol S4A
Maximum Recurrent Peak Reverse Voltage VRRM 50
Maximum RMS Voltage VRMS 35
Maximum DC Blocking Voltage VDC 50

[tw2005]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Hope your having more luck than me. I got my brand new J015B today, looked good too and different to my blown 15B.

BANG!! dead. I could'nt find anything obvious with the existing 16B and did not replace.

I can only assume it killed the new module.

So i ripped the modules out of the Zsus i got going and now the ysus fired up.

Looks like 2 more modules $$.

Picture1 is new, 2 is the old dead one, 3 is now new dead one.

One thing I notice with the bad J016 is the first GND is open, you guys have any idea how this affects the module. I think it is this that is the problem. I've had 2 now that were bad like this.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Hi tw2005, where do you see that? In the pdf, i see 4a for any voltage rating
I might be looking st the wrong place

[tw2005]

Re: LG Plasma 50PC1DR- Y-SUS Issues

yes, but how do i choose which one would be better suited ? there's from 50 to 1000v dc there in the pdf. i can measure what's going thru it and choose anything higher ?

i only see 0.4 or so volts going thru this one :/

4A shows as 50V

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

http://www.digikey.ca/product-detail...ITR-ND/1091483

that would be fine ? sorry to ask stupid questions, im really not safe ordering parts.. a bit scared of ordering the wrong one and creating more problems than i'm fixing !!

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

What's the biggest you can get? :P There is no harm in installing one with too high reverse rating unless it is a zener.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

which one, the small one ? i tested and see 12vdc going across this one.

the bigger 4a one, i'm trying to understand what i need, the pdf posted by tw2005 seems to be of a good device, but i'm wondering what voltage do i need ?

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Are you still looking for the diode - Can't you test across a board with one of those components on there?

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

would that be this PDF I attached to this post?

yes, but how do i choose which one would be better suited ? there's from 50 to 1000v dc there in the pdf. i can measure what's going thru it and choose anything higher ?

i only see 0.4 or so volts going thru this one :/

[tw2005]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Could it be a 4A and those other numbers are date code or batch. I have a bunch of 4A and below I can just make out actually 3 digits. mine are 541 on the 2005 board, 751 on the 2006 board.

would that be this PDF I attached to this post?

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Check the voltage across it. If it's a 15V nominal supply (I suspect it is) use a 20-22V zener diode like this...

http://www.digikey.com/product-detai...87-1-ND/790090

It's just to protect the IPM, or the rest of the board, when something goes wrong and the supply goes too high. Not sure a puny thing like that is going to do much good though, it would usually melt.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

okay. ive got no diode like that left, it was shorted on one of the ysus ive repaired already. so i got a board with none on it..

how can we figure out what a smd marking means ? it says 25.. ive tried to search a lot, but hell, didnt find much.. a lot of references on 25 but not with this package size

maybe i wasnt clear in the way i explained. i mean the board on which that diode shorted had a few shorts on it which i all resolved, a shorted fet etc.. now this one works

so the one missing that diode just needs a new one, all seems fine in that section of that board. the psu was full of 330uf 10v bad caps tho. that's the 3rd plasma of the same model