Ok, so I replaced the video board. Still no go. X board is good, Yboard is good. On the LVDS control board the first LED blinks (d17), D13 Lights up and D12, 11 and 10 are off. What does this mean. The only thing I could find is that they are supposed to be lit per an LG manual. What does it mean when they are off?
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Re: LG Plasma Again
Not clear. Video card is what? Proper term is mainboard (the one with inputs that hooks up to various stuff and one LVDS or dual LVDS (on high end) to logic board?
Cheers, Wizard -
Re: LG Plasma Again
video output board is connected to this board. It is called the LVDS control board in service literature, which doesn't mention the lights.
This is the exact board:
http://cgi.ebay.com/ws/eBayISAPI.dll...m=200465069825Comment
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Re: LG Plasma Again
Also, getting suspicous of zsus. Is 135 the correct voltage at ribbons? Vs is supposed to be 185-195 I thought and that is what goes in.Comment
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Re: LG Plasma Again
I have been trying to find out same and I will as soon as I get back to my l/g 42 with a bad pdp. All of the l/gs have the control with the lights. none of the l/gs I have worked on had d15 lit and some would light up at different times. As Wizard said these are not for diag. You want to check voltage on z board (on the board near the bottom per scribd training manual) as well as at the fuses, not sure which one you have. Bad z will give you a dark or very dim picture and you will be missing the z set up voltage.Comment
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Re: LG Plasma Again
I found your old thread and you said both y and z boards had blown fuses. When these boards fire up you can hear them running. If you replace the control board and you have the voltages from the power supply and you don`t hear the boards running I would say you took out the y sus board. On this model I think the power supply feeds the z board through the y sus board.Comment
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Re: LG Plasma Again
Well both boards were humming. Now the Z is not and hence the y will not either.
http://www.scribd.com/doc/13724852/4...ies-PDP-Module
this is helping me out as the principles are the same. gonna check that hybrid on the z board and the resistors on the x boards.
If the main control board is broke and the zsus is broke too now, I don't know if I should keep messing with this TV. Gonna be a waste of money soon.Comment
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Re: LG Plasma Again
Change the logic board back to old one.
PS: be careful of ribbon cables, be extra care they are inserted correctly. Z is the vertical strip drivers (along the bottom of the panel usually). The Y and X is on both sides, the Y is the usual failure. 135V is a leak. Check the Y buffer chips for one warmer than rest or crater or a fried passive component.
Cheers, WizardComment
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Re: LG Plasma Again
I just replaced the Y though, unless I broke it again. It was humming till I heard a pop from the Z and now it hums no longer. Problem was Y. Then no video. Now its back to square 1. Since the pop, the Z is only 78v out and one of the big transistors on the Y is only 25v. If either of the hybrids blew, I need a new board. I will check the Y again though because I have some spares from the old board.Comment
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Re: LG Plasma Again
Sounds like your faulty board is hurting all the other boards and you are just chasing your tail on this thing. I would fire the y board (with out feeding the z board) off of the control board. This way you will know the y board is working. I wouldn`t worry about a picture right now. just get each board to fire up. Also unplug the x boards from y and z. I have done this on other units with out any problems. just plug or unplug with power off.
You will be able to just fire up the y board and check volts per the training manual. It is easy to learn when you don`t have to give the tv back to the customer. I buy broken...repair and sell. If I can`t repair... I learn.
good luck! CadimanComment
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Re: LG Plasma Again
How can I fire the Y up without the Z? Not in the manual. The x boards are good so is the COF stuff. I went in there last night and checked it all. Going to double check the small y boards but they appear good too. Taking the hybrid off the Z with a desoldering iron now and going to see. I def need a new ctrl board. The vout board was blown too but now that is good. If I can get the hybrid and a cheap control board I might fix it.Comment
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Re: LG Plasma Again
Zsus hybrid is dead.Comment
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Re: LG Plasma Again
y and z chip on yours has the 4 screws one on each corner? give me the panel number off the sticker ( on the pdp ) and I will look at the set up. You can break off the chip corners with screwdriver and remove the heat sink then cut the pins at tne chip with small side cutters then remove the pins one by one. Also a butane soldering iron kicks but on these. I install the chip without the heat sink and use small allen bolts and brass thumb knobs to install heat sink afterwards. Also nice if you have to go back in to re solder or replace the chip latter. I think you said you worked on the crt stuff. I am much better at board and solder work than using my scope, but I always find a way and get stuff working again.
Ambition will always make up for any lack of ability!
CadimanComment
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Re: LG Plasma Again
Panel is PDP42v6. Yea, 4 screws on each corner. Know where to get any? I just used my de-soldering iron on this one. On the Ysus I took it off with braid but I fucked up one or two contacts. This one came off perfect.
The LG literature has all test points and wave forms which would make this easier.I am much better at board and solder work than using my scope
I feel like I keep breaking it more and more while troubleshooting. I think my short did a lot of damage.but I always find a way and get stuff working again.Comment
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Re: LG Plasma Again
I didn`t fix anything until I was about 14, but I sure took out a wharehouse of electronics to get there! you can`t learn unless you f -up...alot. After this you will be an expert on l/g I promise you. Punch in the first part number on the heat sink (on ebay) and it should come up. I will look when I log on soon. I have all of the boards you need, but I didn`t test them yet.
CadimanComment
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Re: LG Plasma Again
Type in (ebay) plasma ic and your chip is either an icyppd-j006c or j007c or look up zulfikar2000 ebay member, they sell these and/or can get them. I am looking up your pdp now.
CadimanComment
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Re: LG Plasma Again
Can't source it. Only saw it on a UK site for $70. But take a gander at this:
http://monitor.net.ru/forum/pdp42v6-...fo-267993.htmlComment
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Re: LG Plasma Again
Ok, I found it. Doesn't mach the part number on the heatsink but it looks to be the right one.Comment
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Re: LG Plasma Again
I am almost sure the ic is the same for both y and z. You will know when you remove them.Comment
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Re: LG Plasma Again
No, the IC for the ysus is bigger and laid out differently. Parts ordered so hopefully I get this working.Comment
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