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Equipment Repairs => LCD TV forum => Topic started by: telfordcompdoc on June 05, 2011,09:59:18

Title: 17PW20 v1.0
Post by: telfordcompdoc on June 05, 2011,09:59:18

Hello all,

I have acquired a Matsui 32" LCD TV. It has the dreaded blinking standby light.

I have purchased the repair kit for this board, replacing the caps and transistor, but it is still blinking....

Does anyone have any other options?

I was told to check the smoothing cap, but I really don't trust myself against such high voltage.

Many thanks in advance.

Title: Re: 17PW20 v1.0
Post by: epi on June 05, 2011,13:59:25

Have you cheked/changed C877 & C878 last one tends to go low (12n 630V), some supplies use one capacitor C878 27n 1000V, C877 not installed.

Title: Re: 17PW20 v1.0
Post by: telfordcompdoc on June 15, 2011,08:13:25

Hello,

Yep checked both 877/878 both are fine - It has had the kit09 fitted to it, so all new caps/IC... Still flashing on standby though.. Can't for the life of me think what else it can be - Failing this, I will have to purchase a whole new 17pw20 v1 board....

Any other ideas?

Many thanks

Title: Re: 17PW20 v1.0
Post by: daz on June 15, 2011,08:41:25

hi ,
check the smoothing block, can cause this fault,
good luck
daz

Title: Re: 17PW20 v1.0
Post by: telfordcompdoc on June 15, 2011,09:18:13

Smothing block... The large cap? I don't know if I trust myself checking that! lol

Title: Re: 17PW20 v1.0
Post by: daz on June 15, 2011,13:56:22

yep thats the one , is usually a 150uf 450v or a 220uf 450v, you will need an esr meter to check it properly, i would just change it, it will probably discharge if psu is left unplugged for a day or so,
good luck
daz

Title: Re: 17PW20 v1.0
Post by: Turnip on June 16, 2011,12:47:03

Hi TFC,

Still wondering about those 15nf/630 caps - well - duff main cap usually initially causes noisy operation then eventual PFC pop.

Did your kit (no details given) include those 15nf caps  ?

Just a thought - Chris.

Title: Re: 17PW20 v1.0
Post by: sparky on June 16, 2011,13:53:06

hi
chris eye? site going he's tested them
dave

Title: Re: 17PW20 v1.0
Post by: Turnip on June 21, 2011,12:20:41

Hi Sparky,

Getting to the age where most everything is going, apart from me tellies - Ah well.

Sure 'tis a good plan to double check on those caps - Chris