sansui lct40sd.

[willyam1]

hi.
power led red is on 5v stby ok.
power it change to green all voltage ok 24v 12v 5v no backlight and after a minute it change to res and right away to green.
notice that the pin bl on is always o.4v.
p.s is magmeet mlt198tl.
main is T.MT8222.1B 9193.
IN CHANGE A SHOTKY DIODE IN5819 in main this leeds the 5vstby to a regu and more but also lead to the 5v in the p.s very STRANGE.
wwhen I change the diode the tv works and when I power to stby and operet it again nothing same problem.
need help.
thanks willyam

[multimeter]

Re: sansui lct40sd.

this diode,is it in the bridge rectifier circuit or an output diode to the secondarys outputs?,if its output diode you need to use UF ONES (ultra fast)

any pics of this diode?use manage attachments.

[willyam1]

Re: sansui lct40sd.

this diode is sitting in the main board not in the power supply.
willyam

[willyam1]

Re: sansui lct40sd.

hi.
problem is the line of 1.2v reg ther is a few ohms in the output rail of this reg.
it goes to the main ic after pull out all the smd capi.
nee to change this board hope I will find it .
thanks to all.
willyam