LG 50PQ30 Heatsinks
Hi. On the YSUS board, can you replace the output transitors on the heatsink if they are shorted? And kind of a dumb question (still trying to learn this stuff) i tested them by the troubleshooting manual of this tv and if it says for instance there is suppose to be .38V from point a to b but it shows OL on my meter, does that mean it is screwed up? Thanks
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Re: LG 50PQ30 Heatsinks
You should be able to change out a transistor on the heat sink. What is the part number of the component you're trying to test? -
Re: LG 50PQ30 Heatsinks
Neither.
You should replace them with IGBT or MOSFET, exact type being indicated by the part #.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: LG 50PQ30 Heatsinks
The part number should be inscribed on the front of the transistor. Q34 is probably the location of the transistor on the Y-Sustain. Are you sure it's bad and that you didn't just incorrectly measure it? Also, if you tested it in circuit, your readings may not be accurate.Last edited by capkid; 10-10-2013, 09:03 PM.Comment
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Re: LG 50PQ30 Heatsinks
Not necessarily, if the panel is not lit up, the boards will not heat up as they are not pumping current into the panel, this can be caused by a bad control board, bad main board, shorted Y- or Z-sus (one or both)...Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: LG 50PQ30 Heatsinks
Ok thanks there Tom, i was starting to worry alittle bit lol.
Is it normal for so many of these Mosfets to go bad on a heatsink at once? I found 7 just on the YSUS. It is the part number 30f124. It says in the manual that im suppose to get 2.02v when i connect the red lead to the first prong and the black lead on the middle prong but i get OL.Comment
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Re: LG 50PQ30 Heatsinks
Which manual are you referring to?
There are often FETs/IGBTs in parallel, so a whole bank can show shorted, but usually only one actually is failed.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 50PQ30 Heatsinks
Remove them and test them out of circuit. Can be frustrating.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 50PQ30 Heatsinks
Alright buddy will do. Seems like alot of work but i am willing to do it. This is my frist plasma im trying to fix. Seems just a tad bit more than an lcd to deal with but i like this kind of thing. I have fixed 3 Lcd tvs so im trying to break the plasma barrier lol. Thanks again for your help. I will be on here as soon as i can test them all and give you an update.Comment
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Re: LG 50PQ30 Heatsinks
Plasma TV pictures look so much better than LCD -- it's worth it!Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 50PQ30 Heatsinks
Just a quick update. I have taken 3 out but with no luck. I think i may be messing them up when removing them. It has OL on all three from the first prong to the second.(Sorry i do not know the name of these prongs) I ordered me and solder sucker to help me get these suckers out. Seems like i have to get it really hot for the solder to even start melting.
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Re: LG 50PQ30 Heatsinks
Decent solder wick such as Chemtronics has never failed me.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 50PQ30 Heatsinks
http://imgur.com/VWbBlmX
Is this even fixable? Or even worth it?
It is straight underneath a heatsink.Comment
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Re: LG 50PQ30 Heatsinks
If that device burned, that will only usually occur due to a FET on the nearby heatsink going shorted.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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LG42PC3D -UD originally with green lamp but no display or audio.
Owner says was working, then went 'pop'.
All 5V caps bulging. replaced.
All PSU output voltages within spec but -Vy is low on YSUS.
One of three parallel fets between SUS_OUT and SUS_DN is zenering,
eventually shorts DG. Replaced all 3 - -Vy now OK.
Y scan buffer test point does not follow YSUS output below -50V
Note: This unit seems to expect YSUS output to park at -Vy in between
drive signal pattern periods. A replacement drive signal board confirms this....11-18-2021, 11:49 AM -
Greetings all!
Originally this set had the usual messed up video symptoms such as: horizontal lines, weak, grainy video, bottom and top of picture differ in intensity of problem. It also seemed to slow to turn on or show the messed up picture.
Seemed like must be YScan/buffer board failure. Ordered buffer boards from my distributor which were supposed to be original/new and also from another distributor, I ordered the YSUS because I wanted to replace it for preventative maintenance. (also, the YSUS had a bulged cap, so there was even more reason to suspect it could... -
Hi
Had shorted YSUS
Q24 RPJ63F3
C726 cap
Q11 K3667
R528 & R529 2.2 ohm
replaced all of these but still trips psu VS & VA are a bit low when ysus disconnected. IC301 does look a bit burnt however
ZSUS is also good as far as I can tell
Anyone could help me out on this one -
Hello all,
I have a problem with my LG 60PH6608. The TV is only clicking and doesn't get started.
I checked the power supply and measured that the 200V is shorted at the YSUS board.
All IGBTs, the MOSFET K8A60DA and the diode D603 are shorten.
So I replaced the parts. I checked the further parts for shorts and I was pretty sure that there is no further problem on the board.
So I plugged it in. Directly, resistor R251 (2,2 Ohm) blowed out with a little spark. Immediately I disconnected the TV from supply.
I checked the replaced parts (IGBTs, MOSFET... -
Has anyone ever gone down this road? I have a number of copper (and copper plated :/ ) and aluminum heatsinks. As well as full computers. Ever heard of any companies that will buy them off me (for not that much probably). I've been sending them to e-recycling
I kept a beige taaaaall antec case, going to try TC's yellowing remover and try to create an old system. Probably multiboot with DOS and 98 and 2k to cover all my bases
Maybe even use a certain Voodoo5 card in it
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