haier l37a8a-a1

[willyam1]

hi to all.
problem is pic is ok for a few sec then freeze and then fic fade away slowly and then vertical lines in all the screen.
i change the main board just in case no luck.
some meserment in TCON vgh=16 vgl=-6v vcc=3.3v 1.5v in out reg .
by scop can see signals in the input of the tcon cabel.
i dismantale the screen and check the ribbon cabel all ok.
is it screen or the TCON BOARD =6870C-0158A.
THANKS WILLYAM1

[willyam1]

Re: haier l37a8a-a1FREEZE PIC

[QUOTE=willyam1;384694]hi to all.
problem is pic is ok for a few sec then freeze and then fic fade away slowly and then vertical lines in all the screen.
i change the main board just in case no luck.
some meserment in TCON vgh=16 vgl=-6v vcc=3.3v 1.5v in out reg .
by scop can see signals in the input of the tcon cabel.
i dismantale the screen and check the ribbon cabel all ok.
is it screen or the TCON BOARD =6870C-0158A.
vgh in scope showing a pulsses its semms to me that its not correct its sould be steady dc like vcc vgl vdd need to know wich ic supply that valltage is itTPS6561 OR RT8901 OR COULD BE A SMD CAPI OR DIODE.
WILLYAM1

[tom66]

Re: haier l37a8a-a1

Is VGH pulsing when pic OK?

[willyam1]

Re: haier l37a8a-a1

yes its also pulsing when the pic is ok.the tv is conected to my laptop and when i change the page the last pic is shwoing but not the newone and slowly fade away.
the vgh always with pulses.
willyam

[tom66]

Re: haier l37a8a-a1

Can we see a picture of the t-con? Need to see if it has RAM memory.

[willyam1]

Re: haier l37a8a-a1

i will send pic tomorrow i think its vgot a ram memory

[willyam1]

Re: haier l37a8a-a1

any data on the chip RT8901

[willyam1]

Re: haier l37a8a-a1

solve.
i change the ic rt8901 now i got 24v pic ok.
willyam