42pc5D green 3 flashes then standby

[jdoncouse]

As the title says you turn it on it flashes 3 times you can hear the power board click then a power surging sound then it cuts back off. this is my second plasma i've looked into and i tried to look at the service manual but there's no real troubleshooting on it.. the caps dont look bad but i was just getting a opinion if yall think its just the power board on it. thanks

[Ryckmav]

Re: 42pc5D green 3 flashes then standby

look like power supply overheat and will give up soon

the 3 Click noise is the CPU seeing not enough voltage is made and refuse to start.

[martino]

Re: 42pc5D green 3 flashes then standby

Probably the power surging you hear is the powerboard grunting over a shorted VA or VS on either Y or Z board...
They got a somewhat famous module on there,that likes to fail.
Can you check resistance between Vs and gnd,Va and gnd on connector P1 at the Zboard? Unplug connector and measure at the pins..
Same with the Yboard on connector P3.

[jdoncouse]

Re: 42pc5D green 3 flashes then standby

WOW i feel dumb for not trying this at first.. i unplugged the p3 connector and the set turned on and had sound.. the pins to the p3 connector was getting the right voltage for the set so i'm guessing a bad ysus? since i can't really check for right voltage to the zsus

[martino]

Re: 42pc5D green 3 flashes then standby

try it with P3 connected,but P1 disconnected,that should tell you if it's the Yboard or Z board,as Zboard gets its power through the Yboard...
Did you measure resistance too on the Y and Z board pins?
***always wait 15 minutes before plugging P1 or P3 back in,as the powerboard keeps a charge for awhile after you powered it up,if you plug ot back in right away you can get a nasty zapp on the plugs...

[jdoncouse]

Re: 42pc5D green 3 flashes then standby

yeah i should have mentioned that i did pull the p1 out and so only the y sus is connected and it's not cutting on anymore. *pretty much.. no ysus or zsus.. cuts on has sound.. plugs in p3 to ysus doesn't work... p3 pins have right voltage.. p1 is all over the place.. can't get a good reading sometimes shows O.L i'm guessing overload for vs test on p1 pins.. *

[martino]

Re: 42pc5D green 3 flashes then standby

pretty safe to say it's your Y board then...
Want to component level repair or just buy a replacement board?

[jdoncouse]

Re: 42pc5D green 3 flashes then standby

i've seen replacement board prices... how are component level repair cost.. thanks by the way

[martino]

Re: 42pc5D green 3 flashes then standby

First we should test the buffer board...
Can you hook up P1 and P3 as it should,take screws out of the bufferboard and disconnect it from the Y board? You can leave the ribbon cables in,just make sure it's completely disconnected from the Yboard...then turn on tv,same? or turns on,sound works?

[jdoncouse]

Re: 42pc5D green 3 flashes then standby

alright one sec..

[jdoncouse]

Re: 42pc5D green 3 flashes then standby

ok no difference with the buffer board out... none of the squares *can't remember what they are called atm *look burnt on the bottem side of the buffer board.. that's what was wrong with my last plasma i worked on. so i'm sure the buffer board is good

[jdoncouse]

Re: 42pc5D green 3 flashes then standby

ok ... so i pull out the ysus and i notice there is some kinda sticky shit all over the back of the board kinda looks like a bunch of flux... it has defiantly corroded some of the solder points.. so i'm sure the board just needs replacing.. *on top of that looking everything else over... there are little dimples in the zsus ribbon cables going to the panel.. i think it's time to give up on this one.. too much at stake..*

[martino]

Re: 42pc5D green 3 flashes then standby

pic of those dimples?