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Equipment Repairs => PLASMA TV forum => Topic started by: daz on October 15, 2009,09:43:59

Title: LG PDP42V6
Post by: daz on October 15, 2009,09:43:59

hello all
is anyone aware of a common problem which causes the zsus pcb to fail
i replaced one a few weeks back and its failed again
psu voltages seem ok

Title: Re: LG PDP42V6
Post by: daz on October 15, 2009,09:51:18

sorry its a PDP42V5

Title: Re: LG PDP42V6
Post by: norman on October 15, 2009,10:52:50

Hi Daz, I believe the lower drive pcb can damage the Y sustain board. Welcome to the world of plasma repair. Cheers, Norman

Title: Re: LG PDP42V6
Post by: daz on October 15, 2009,11:06:42

hello norman
yes ive had that fault a few times,but the fault is with the zsus board this time which i have never had a repeat failure on,
i never thought i would miss fixing philips a10 chassis!

Title: Re: LG PDP42V6
Post by: norman on October 15, 2009,14:48:11

Hi Daz, Sorry about my confusion, (must get new glasses!). I would think the pdp panel is faulty if not just a faulty board. Will your supplier change it? What is the number on the board, I may have a used one to sacrifice and prove the pdp one way or the other. Cheers, Norman

Title: Re: LG PDP42V6
Post by: daz on October 16, 2009,08:36:24

hi norman
i got a replacement board from supplier,its has run ok for 8 hours  in the workshop,will give it back to customer and see how it goes.if it fails again i fear you may be right about the panel causing the fault.

Title: Re: LG PDP42V5
Post by: daz on October 21, 2009,11:40:17

quick update on this one
it failed as soon as the customer got it home,
fault is now split screen and double image (horizontal}
c16 popped
i checked the voltages again and found the 15v input was reading between 12v and 18v
this voltage look to come from the ysus pcb,this looks to be causeing the fault
but im not going to buy 2 new boards to find out
.bloody plasmas!

Title: Re: LG PDP42V6
Post by: daz on October 22, 2009,04:58:28

hello norman
thanks for the offer of a used board
i would like to get to the bottom of this fault,i suspect its just a few duff caps in the y sus causing the fault,so a sacrificial z sus pcb would be handy if you have got one, the z sus number is 6871qzh030b
fingers crossed.

Title: Re: LG PDP42V6
Post by: norman on October 23, 2009,07:54:06

Hi Daz, Sorry if I got your hopes up. I have two boards one is marked 6871QZH041A the other is 6871QZH049A. I don't know if they are interchangeable with yours. If you think one may do please let me know. Norman

Title: Re: LG PDP42V6
Post by: daz on October 23, 2009,09:38:07

dont think they are
but thanks for takeing the time to look

Title: Re: LG PDP42V6
Post by: tv john on November 26, 2009,16:50:30

Hi guys,one of these backfired on me today.Aug 12th-fitted new ZSUS,Oct 14th gone again and got a replacement from CHS ,fitted Teusday,blew a fuse again on Wednesday (on new pcb). Came to conclusion the YSUS was at fault and possibly C72 (33/25v) could be to blame.
I don't think they will want to pay for a new YSUS pcb and don't think CHS would stand me another pcb.

John.

Title: Re: LG PDP42V6
Post by: mulja on November 27, 2009,11:55:07

Hi Tv john

i had one last week with faulty zsus board

first thing check voltage on pin 1 or 8 at the bottom of the zsus board must be 15v
if is to low 10-12v then change C72 on Ysus this bring up voltage to 15v

chassis pdp42v6 not pdp42v5

good luck

Title: Re: LG PDP42V6
Post by: brainstorm on December 11, 2009,09:05:11

Hi Daz,

I always change Y and Z sus boards as a pair to be on the safe side or it can get a bit expensive.
I had a conversation with LG technical previously and they recommend you change them together.

Regards
Brian