Sony xbr65x900c sound yes, no backlight or image.

[nomoresonys]

Re: Sony xbr65x900c sound yes, no backlight or image.

Took 1 cap out, tested board on the bench, got 167 on main filter cap with just power connected, jumped 5 and 7 stby-poweron, filter cap only rose to 274, isn't that way too low or is it only partially on at that point?

[Diah]

Re: Sony xbr65x900c sound yes, no backlight or image.

Took 1 cap out, tested board on the bench, got 167 on main filter cap with just power connected, jumped 5 and 7 stby-poweron, filter cap only rose to 274, isn't that way too low or is it only partially on at that point?

sound good.. did you messured any voltage on the socket ?

[nomoresonys]

Re: Sony xbr65x900c sound yes, no backlight or image.

Yes, the 12 volt pins are still 0, still have zener 909 reading short.

[Diah]

Re: Sony xbr65x900c sound yes, no backlight or image.

Yes, the 12 volt pins are still 0.

did you measured the 12V on the socket with references the black probe on the COLD ( secondary ) area chassis ??

[nomoresonys]

Re: Sony xbr65x900c sound yes, no backlight or image.

For ground I used the ground screw holder thats metal labeled gp4 on the board.

[nomoresonys]

Re: Sony xbr65x900c sound yes, no backlight or image.

Still wondering why ZD909 reads short in circuit and none of the others do??

[Diah]

Re: Sony xbr65x900c sound yes, no backlight or image.

Still wondering why ZD909 reads short in circuit and none of the others do??

but out of the board it read correct... right?... did you searched on the ic spec close to the zener

[nomoresonys]

Re: Sony xbr65x900c sound yes, no backlight or image.

Yes, will retrieve data sheet, thanks.

[nomoresonys]

Re: Sony xbr65x900c sound yes, no backlight or image.

It's a a6069h, I think this is the equivalent: https://datasheetspdf.com/datasheet/STR-A6069H.html

[nomoresonys]

Re: Sony xbr65x900c sound yes, no backlight or image.

Can I test that in circuit? thanks.

[Diah]

Re: Sony xbr65x900c sound yes, no backlight or image.

Can I test that in circuit? thanks.

its okay, as you have standby viltage

[nomoresonys]

Re: Sony xbr65x900c sound yes, no backlight or image.

Thats a relief, don't have to deal with that dam thing, thanks.

[nomoresonys]

Re: Sony xbr65x900c sound yes, no backlight or image.

What is a puzzle is that zd909 did not test short in circuit til after the caps blew??

[R_J]

Re: Sony xbr65x900c sound yes, no backlight or image.

Is ZD909 across R907A/R907B? I suspect those are the source resistors for the ic's internal mosfet and are usually around 1Ω or less

[nomoresonys]

Re: Sony xbr65x900c sound yes, no backlight or image.

Thanks for reply, yes it is across, both are at 2.2 ohms. They both continually beep in diode mode like a fuse does.

[nomoresonys]

Re: Sony xbr65x900c sound yes, no backlight or image.

Of all the little resistors on underside theres 6 that continually beep. The rest don't.

[Diah]

Re: Sony xbr65x900c sound yes, no backlight or image.

i still think you have open circuit some where.. lets do this beside the jumpers you did STBY3.3V with Power_on, put another jumper between STBY3.3V and BL_ON then measure if you have any voltage over the secondary area not only the socket.

[nomoresonys]

Re: Sony xbr65x900c sound yes, no backlight or image.

I think your right Diah, with those 3 jumped I have 275 v on main filter cap, I checked the 4 electrolytic caps right by the connector but there's 0 volts on all of them, does that make sense? thanks.

[nomoresonys]

Re: Sony xbr65x900c sound yes, no backlight or image.

Still no 12 v, strange because I'm pretty sure I measured once and all the 12's were there with everything hooked up, right after I replaced the blown caps.

[vinceroger69]

Re: Sony xbr65x900c sound yes, no backlight or image.

on the psu secondary side the 3amp resistor type fuse i guess you have checked that?