LG RZ42PX11 goes negative

[fincaman]

Hello all I am a newbie but oldie, I was a TV engineer for many years of my life but am now retired (well semi) I have an LG RZ42PX11 the picture flickers and goes negative looking and sometimes goes into vertical ragged bands. I saw a post by "Norman" saying replace C203, C36 and C72, unfortunately because it is so many years since I repaired a TV I Don't know which is the Y-SUS board, can anyone help me with this fault and board identification.

[Turnip]

Hi,

I miss our Norman too - many folks (Buffy etc) seem to have become Quuq extinct.

Bet it's your Z-sus popped, sits RHS with back removed, has two fuses top LHS, usually blown. Fets under aluminium heatsink blown.

Common fault so few spares about - odd Eastern sites offer domestic solutions

[fincaman]

Hello There, Thank's for your help I will try that early next week but it does seem strange how fuses can be blown and still get a normal picture at times

[daz]

hi
this is the y sus pcb (see pic)
and this is the kit you need

http://www.chsinteractive.co.uk/electrical-components/spares-televsion-audio-video/kits-repair-modification-and-upgrade/grundig-1/repair-kit-capacitors-pdp42v6-ysus-6871qyh029a.htm
good luck
daz

[daz]

i have also noticed of late, a decline in the number of fellow tele bashers on the site,
perhapse they have all retired to the sun and are living it up.

[fincaman]

Will have a look and report back

[tv tony]

hello daz, yourre right, they are either calling for the men in white coats or dead or strokes and heart attacks, ive done the last two, this game is getting harder, ive asked on here if anyone wants employment in this field, where are they all!

[daz]

All engineers I know have retired, most with health problems.I suspect the few sane ones remaining  started doing aerial installations,(seems to be loads round our way) what with people needing a new ‘digital’ aerial, life is much simpler when you only have one wire to worry about, if only I liked heights!

[Turnip]

Hi Daz,

Wealth problem me'self, but at least lots of sun in Norfolk in me old age. Bit like you and Dawkins, don't hold much with future elevation with 70 pristine Neon/Cellos to sort - tinning the iron - Chris

PS - As an afterthought, have had several sets with very dark snowy pics and was always the Z-Sus with fuses blown. Have another in at the moment that had the Z-Sus fuse/Fet prob, changed the Z-Sus for what I thought was a good one, and the the set is perfect for an hour, then it shows a strange LSD' ish picture.

You think Y-Sus perhaps ? 

[daz]

hi chris
if it is a ver6 lg then yes, the 33uf caps go faulty on the y sus and will cause the z sus to fail, best switch it off and check those caps, the tell tail sign is the 15 volts to the z sus pcb will be wrong.
the repair kit should fix it.
daz

[Turnip]

Hi Daz,

On to it - Have lots of 47mfd Wiltsgrove caps, will replace those 33Mfs  - Confess don't go easily for repair kits, as they can have bits never used as not proven faulty - will then check the 15V to Z-Sus

Thanks again - Cheapskate perhaps - Chris.

[brainstorm]

Hi

I think a lot of engineers are on the 'other' website, I see a lot of familiar names popping up

It will cost you a 'tenner' a year chris, so may be too rich for you!

I think the only problem with this site(trying to be constructive) is wading through all the ads etc,
also there are so few engineers on here that you are constantly 'giving' and not necessarily getting much back in return

Brian

[Bambooz]

I think the only problem with this site(trying to be constructive) is wading through all the ads etc

I'm not seeing any of those (adblock plus for firefox). Just disabled it for a while.. holy cr@p..
Main "problem" i've been having is that the whole site is just sloooow as hell no matter what i do. (maybe because it's hosted in the US (?))

[Turnip]

Thanks Brian,

Suspect Plasma technology and sets soon in the bin - bit like Philips and Betamax  VCR.

Got to be modern - Tesco for us - never a cheap Plasma these-days.

Loved Betamax, they were cheap - hated Philips (since K30's) esp. 1700/2000's with those VCR lid drivecords and later Tv with M'proc troubles

70/80/90's was some of us.

F J Camm new comic for modern chaps  - Will currently stick to Quuq, a tenner is a tenner - Ever the Cheapskate - Chris

[Bambooz]

[...] hated Philips [...]

Don't forget the dreaded ESF tubes..