help with 42v7 plasma tv

[mkeen]

hello
I have been given a faulty 42v7 plasma tv and i was hoping i could repair it with minimal cash spent as I'm a bit poor at the moment

the cause of the fault is the owner tried to adjust the set up /set dwn whilst the cover was still on he said there was a spark and it switched off.

i took the cover of to find that he had shorted a cap to the case
as there was large mark on the cap.

so i replaced the cap and the blown fuse on the ysus board
and the tv will switch on then off after a couple of seconds
I disconnected the ysus board and the tv will switch on,
so i don't think anything other than the ysus board is damaged
i don't have the funds to buy a new board so would prefer to replace components.


please could some one direct me on how to find the faulty components

Kind regards
Mike.

[tom66]

Re: help with 42v7 plasma tv

There is a chance the module under the heatsink is bad. This is the IPM. Replacement is difficult, so if it is at fault then a new board may be the only option.

First, can you check the resistance, in ohms, between VS and GND, on the Y-sus?

[mkeen]

Re: help with 42v7 plasma tv

thanks
i just checked it shows 1 ohms on my cheap dmm.
so does this mean the chip is fried?

[tom66]

Re: help with 42v7 plasma tv

It is very likely. While other faults are possible, the IPM is the most common.

If you visit the local dump often, broken (smashed) 42V5~42V8 based plasmas are dumped almost every day. You may be able to harvest the board from that.

The IPM is around £20~£30, replacement requires a high power soldering iron though.

[mkeen]

Re: help with 42v7 plasma tv

thanks
the tip by me don't let you take anything of site
what wattage iron would you recommend as i will try do desolder and replace the IPM
before i try to source a replacement board.

[tom66]

Re: help with 42v7 plasma tv

It is really not practical without a desoldering gun which will cost you more than one Y-sustain board.

[mkeen]

Re: help with 42v7 plasma tv

ok then i will try my best to get a replacement board
thank you very much for your help

kind regards
mike

[mkeen]

Re: help with 42v7 plasma tv

I have managed to de-solder the IPM.
so i will order a new one sometime next week
hopefully it will solve my problem.

[tom66]

Re: help with 42v7 plasma tv

Match the model # on IPM when ordering.
Before you order, re-measure the VS to GND resistance and check that it is now open.

[mkeen]

Re: help with 42v7 plasma tv

VS to GND is now open

my IPM is STK795-811a 6IBLN
but i can only find the STK795-811a 6IBDK

would it be ok to use this one?
or do i have to have exact match?

[tom66]

Re: help with 42v7 plasma tv

That should be fine as a replacement goes. You will also need fresh thermal paste.

[mkeen]

Re: help with 42v7 plasma tv

thanks
Iwill get the IPM ordered and hope everything goes as planned.
again thanks for you help:P

kind regards
Mike.