Troubleshooting LG plasma TV 60PZ550 no picture, auto shutoff

[Alastair E]

Re: Troubleshooting LG plasma TV 60PZ550 no picture, auto shutoff

Seeing thats the Gate Drive resistor (parallel 10 ohms, meaning 5 actual) and they are fried--Whatever is Driving that gate circuit would have been killed by the IGBT going short and shoving 200V up its ass!

Check the driver transistor pair and any inverter/gate/buffer attached to the gate-circuit, or just replacing the three IGBT's and two 10 ohms will be Very disappointing!

[tw2005]

Re: Troubleshooting LG plasma TV 60PZ550 no picture, auto shutoff

Seeing thats the Gate Drive resistor (parallel 10 ohms, meaning 5 actual) and they are fried--Whatever is Driving that gate circuit would have been killed by the IGBT going short and shoving 200V up its ass!

Check the driver transistor pair and any inverter/gate/buffer attached to the gate-circuit, or just replacing the three IGBT's and two 10 ohms will be Very disappointing!

I was just looking at another rev board and looks like the 10 ohm have been changed to 27 ohm

[imafan]

Re: Troubleshooting LG plasma TV 60PZ550 no picture, auto shutoff

Check the driver transistor pair and any inverter/gate/buffer attached to the gate-circuit, or just replacing the three IGBT's and two 10 ohms will be Very disappointing!

Can you please elaborate? I'm new at this . attached is the circuit around this heatsink, what else can i check?

Took out Q212 and the two burned resistors. Q210 and Q208 is no longer shorted. they stay open(read 1 on left side) when I touch the legs.

where can I get 6.3ah250vp fuse replacement? (open fuse is blown fuse right?) Also, can the fuse holder be removed? they don't seem to budge. I had to unsolder the fuse holder but they still don't want to let go of the fuse.

[tw2005]

Re: Troubleshooting LG plasma TV 60PZ550 no picture, auto shutoff

that's an axial mounted fuse, that's how they're made with leads.

http://www.digikey.com.au/product-se...=0&pageSize=25

The other bits Allistair is referring to is that cluster of parts in that image I put up. you can see the drive cct

[imafan]

Re: Troubleshooting LG plasma TV 60PZ550 no picture, auto shutoff

can't find anywhere that has a zsus (EBR67820001) in stock so will try to replace components instead. is this fuse http://www.ebay.com/itm/191581280856 ok for replacement? will get a FGPF4633 from the same seller so will get both together if it is.

[tw2005]

Re: Troubleshooting LG plasma TV 60PZ550 no picture, auto shutoff

can't find anywhere that has a zsus (EBR67820001) in stock so will try to replace components instead. is this fuse http://www.ebay.com/itm/191581280856 ok for replacement? will get a FGPF4633 from the same seller so will get both together if it is.

fuse should be fine

There is a kit for $30, 10 components

I can see 4 x TO220 devices. and 3 smd resistors but package could be folded over meanin could be 6 resistors which makes more sense since each FGPF4633 IGBT has 2 x 10 ohm on the gate.

that gives a total 10 components.
Kits don't always cover every scenario, ,just the common ones.
http://www.ebay.com.au/itm/LG-EBR678...item2c9b5866ab

The TO220 components would most likely be 3 x FGPF4633 + ?

I would expect the ? will be a fast rectifying diode in TO220.

If all that is true then that implies the drive cct may survive.

So if the mystery TO220 can be identified and the other 2 IGBTS are not short then there's a chance this could fire up and produce an image on just the 2 remaining just for a quick test .

But that's risky stuff and since these appear to be rare and most likely a common failure in these you certainly don't want to burn up the board just in case you have to send it off for repair. I'd expect ModuslinkPTS will do these

[Ltank]

Re: Troubleshooting LG plasma TV 60PZ550 no picture, auto shutoff

MCM Electronics has them in stock 125 bucks. http://www.mcmelectronics.com/product/EBR67820001
parts store has them 132 bucks
https://www.partstore.com/SearchResu...sp=PMN&x=0&y=0

[tw2005]

Re: Troubleshooting LG plasma TV 60PZ550 no picture, auto shutoff

I can't be sure what the 4th item is but I'd check Q205,206,207 and D215,239 for short.

It might also be worth trying to cleanup those ICs in that drive cct and identify the part numbers.

This is a kit for that other revision board, $10 cheaper and 50% more parts

http://www.ebay.com/itm/PARTS-PACK-f...item33a2e6a260

6pcs TO-220 FETs
1pcs Fuse
9pcs surface resistors

If you're going to spend $5 USD on a 5 fuses and $6 USD on just 1 IGBT, I think the $20 kit is a smarter option. The resistors may not match yours but since it's for the other board but if that was the case find them separate or replace the entire lot supplied in the kit, I doubt it will matter.

You could pop a message to the seller explaining you have a different version and confirm the kit has the same transistors as fitted to your board.

SLP5188 prices are quite high compared to other sellers.

[tw2005]

Re: Troubleshooting LG plasma TV 60PZ550 no picture, auto shutoff

modus should be able to repair for the same price as this board. $73

http://www.moduslinkptstvboards.com/EBR73561701/

I'd point out both that and EBR67820001 are fitted to 60PZ550 and look to be physically same , I'd expect they both fail the same and the above revison does have different gate drive resistor values maybe in an attempt to reduce failures?

or

http://www.ebay.com/itm/REPAIR-SERVI...item33a1502921

But I'd give preference to modus.

[imafan]

Re: Troubleshooting LG plasma TV 60PZ550 no picture, auto shutoff

both mcm and partstore are also OOS. Thanks for the repair links. didn't know about that option. i might just do that instead of paying a good % and still not sure it'll work.

[tw2005]

Re: Troubleshooting LG plasma TV 60PZ550 no picture, auto shutoff

both mcm and partstore are also OOS. Thanks for the repair links. didn't know about that option. i might just do that instead of paying a good % and still not sure it'll work.

If going down that path and Modus , this is what I'd do.

Send them a message, attach the web link for the other version board they do do and the price for the 60PZ550, then highlight or give them your board number which visibly looks the same.

Mention what you found, i.e. fuse xyz open, Q ??? shorted, Rxyz & R abc (10 ohm burnt) for corresponding transistor.

then mention you've removed these items, hopefully the board is still good and you have not damaged the lands.

take good clear images of the whole board top and bottom, take close ups of where you've worked .

attach them to the email.

then ask if they can do your board for the same price as the other.

All going well they do the same deal and sort it out for you.

From all reports back, they're pretty good and on the odd occasion of a bad repair sort that out to but this should be pretty straight forward for them. easier than Ysus in my opinion

good luck

[imafan]

Re: Troubleshooting LG plasma TV 60PZ550 no picture, auto shutoff

Thanks Tw2005. contacted Modus and waiting for response. slp5188 kit list has the right parts(contacted him for part#s) so i might try that(after some more testing) if modus doesn't want to fix:
8
VALUE L8EP01 Quantity
FGPF4633 T220 3
FGPF4634 3
10 OHM 805 3

6.3 AMP PT 1

For educational purpose, the drive cct is the lower right clusters in post #22?

[tw2005]

Re: Troubleshooting LG plasma TV 60PZ550 no picture, auto shutoff

Thanks Tw2005. contacted Modus and waiting for response. slp5188 kit list has the right parts(contacted him for part#s) so i might try that(after some more testing) if modus doesn't want to fix:
8
VALUE L8EP01 Quantity
FGPF4633 T220 3
FGPF4634 3
10 OHM 805 3

6.3 AMP PT 1

For educational purpose, the drive cct is the lower right clusters in post #22?

I wonder why only 3 resistors when each has 2? anyway looking at your board it does appear just 2 will be needed.

And yes, drive cct as you stated and it was intentional when I cropped that to have that visible for reference so you had an idea what other bits to watch for.

[imafan]

Re: Troubleshooting LG plasma TV 60PZ550 no picture, auto shutoff

Thanks all for your help. Modus didn't take the repair because part # didn't match but the samcomponent from ebay did an excellent job and fast turn around. he even touched up the solder joint of the coils that were slightly shown cracked sign from bottom of board. Tv is operational again now!