Mulja tv repair portal

Equipment Repairs => LCD TV forum => Topic started by: sparky on February 27, 2010,12:41:13

Title: waltham dtv1500v
Post by: sparky on February 27, 2010,12:41:13

hi
help if poss when first switch on sound and pic then
instantlly no  pic  backlight not on have check for dry
joints checked  inverter tx, combined power and invertor panel
sparky

Title: Re: waltham dtv1500v
Post by: Turnip on February 27, 2010,13:04:40

Hi Sparky,

Not yet listed, seems like 'C' crap, but go on, give us a piccy so we can chuckle - Chris.

Title: Re: waltham dtv1500v
Post by: jima1vespas on February 27, 2010,13:29:41

sound familiar to one i had is power supply number 17ips02 if so its a vestel. i will try and find notes

Title: Re: waltham dtv1500v
Post by: sparky on February 27, 2010,14:07:07

hi
will post pic tomorrow, looks sim to 17ips02
sparky

Title: Re: waltham dtv1500v
Post by: sparky on February 27, 2010,14:41:28

hi
chassis 17IPS01-2 have found on another site
suggest fan 7314 on underneath board will
have a look saturday

Title: Re: waltham dtv1500v
Post by: jima1vespas on February 27, 2010,14:50:26

checked notes 17ips01-2  c354, c355, c356 all 12j 3kv cured mine

Title: Re: waltham dtv1500v
Post by: sparky on February 27, 2010,15:30:17

thanks for info will check them tomorrow and let you
no just having a pint
sparky

Title: Re: waltham dtv1500v
Post by: Contrast John on February 27, 2010,15:39:43

Hi All
If the caps dont do the trick it`s worth swopping the inverter transformer. Had the same problem with a Sanyo portable using a similar board. Transformer looked ok and had the same resistance readings as one from a scrap board, but swopping it cured the problem.
Regards
John.

Title: Re: waltham dtv1500v
Post by: sparky on February 27, 2010,15:56:24

hi
already changed invertor tx
thanks
sparky

Title: Re: waltham dtv1500v
Post by: sparky on February 28, 2010,04:19:40

hi jim1vespas

change all caps all working again thanks for info

sparky

Title: Re: waltham dtv1500v
Post by: Turnip on March 01, 2010,11:58:40

Hi Sparky,

Note that the caps (with no values suggested) were 12J 3kv types, puzzled, as those don't tend to bulge - Chris - bit pernickety perhaps, but think of our loyal readers.

Title: Re: waltham dtv1500v
Post by: sparky on March 01, 2010,13:26:41

hi
the old ones read ok , new ones worked ok
put originals back still no pic
fitted new pic ok
strange , not like the philips cap that split and blows
chopper transister
sparky

Title: Re: waltham dtv1500v
Post by: Turnip on March 02, 2010,12:39:30

Hi Sparky,

Congrats, and what were the values of those 3kv caps for folks without a shematic ?

Curious, mainly for Quuq readers - Chris.

Title: Re: waltham dtv1500v
Post by: sparky on March 02, 2010,13:13:10

hi
on my cap meter they measure 12pf 3kv wkd
i hope? lucky had a siml panel cracked in half
used as spares
sparky

Title: Re: waltham dtv1500v
Post by: iedwar07 on January 21, 2011,05:25:11

Hi,

Thanks to everyone for this info. I can confirm that replacing the 3 caps mentioned - c354, c355, c356 - all 12pf / 3KV cured mine - a Mikomi LCD15796. The caps must be breaking down under voltage - they measure perfectly when tested out of circuit

I found someone selling replacement caps on eBay - a few £s for twenty five of them

Cheers, Ian

Title: Re: waltham dtv1500v
Post by: Turnip on January 21, 2011,11:55:24

Hi folks,

Note that both Sparky and C/J too have had the same positive result - awful glad, but I've changed those caps more than once and it didn't do the biz fer me.

Trying to keep the faith - and hoping - Chris

Title: Re: waltham dtv1500v
Post by: sparkbox on May 16, 2013,07:56:40

Hi all, just had a similar problem (brief picture then only sound) with a Mikomi LCD15796F tv purchased from Argos in 2007 and in particular the inverter section of the 17ips01-2 module. It was a set waiting to be thrown out or be repaired and thanks to this site I replaced the three offending blue capacitors with some new safety certified Murata types from Farnell CPC (one day service) and now it works perfectly again. A 4.7pF type was not available so I used two 10pF in series, which is across the transformer coil output, so having an advantage of not stressing them so much as for one on it's own. Although these caps are rated at 3kV, it is possible with aging that they break down, short-circuit and shut the inverter off. Not a difficult job to fix except the solder pads are a little flimsy and so care required when de-soldering the old capacitors. Luckily the other parts of the circuit were undamaged.