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Equipment Repairs => LCD TV forum => Topic started by: WILLYAM1 on August 18, 2012,04:24:25

Title: uniden-17mb12-2 vestel 32''
Post by: WILLYAM1 on August 18, 2012,04:24:25

hi.
problem is flickering screen.
can see that the backlight is flicker and the 24v is not stable.
the p.s is 17pw20.1.
no bulgging capi.
the first operetion tv is ok and by heatingthe p.s by fan its start to flicker.
any adia?.
willyam

Title: Re: uniden-17mb12-2 vestel 32''
Post by: jordan on August 18, 2012,08:28:27

 :sign0085:

Title: Re: uniden-17mb12-2 vestel 32''
Post by: WILLYAM1 on August 20, 2012,01:21:28

thanks jordan.
notice that the volltage in main capi is 300v in stby and in operetion the volltage is 327v and it shuold be araund 400v also . the volltge to the pfc sectionis 12.5v(vcc to pfc ic 3527)suold be 15v keep on digging and notify you guys. ichange a few capi but no change.
willyam

Title: Re: uniden-17mb12-2 vestel 32''
Post by: WILLYAM1 on August 20, 2012,07:10:31

hi.
checking all compenent ...nothing.
not sut=re if problem is p.s or ccfl or inverter.
in first tv works fine after 30 min backlight start to flicker.
anyone hade the same problem?HELP HELP.
WILLYAM

Title: Re: uniden-17mb12-2 vestel 32''
Post by: astracat on August 29, 2012,16:46:31

hi
dont know if this will help
just done a swissteck with similar probs, another inverter cured it
regards
astracat

Title: Re: uniden-17mb12-2 vestel 32''
Post by: WILLYAM1 on August 30, 2012,10:36:02

thanks astract.
done it today.
its been working for 5 hours.
i change a smd capi 1n that is conected to pin 6 to the sg3525.
i notice that when the probe of the scopwas checking the signal it stop to flicker.
thanks willyam1