VESTEL 3208 Sound but no picture

[shepp]

Re: VESTEL 3208 Sound but no picture

The readings should be all the same, not sure but last ones i checked were around 400 ohms and the dud ones were 650ohms, do it by going from each pin on the transformer and write down all the readings for each transformer, then see if any are differant from the rest, with out seeing the transformers i cant tell you which pins are which etc, but you can do this by process of elimination

[shepp]

Re: VESTEL 3208 Sound but no picture

I left them in circuit with all the connectors out and this was sufficient for me, problem was fixed with new invertor board

[s_henya]

Re: VESTEL 3208 Sound but no picture

That's really bad news, if that missing lamp is a must, i think i will stop here,
if that former tech took the lamp, who knows what else did he do.
im adding a picture of the inverter and the lamps,

give me your honest opinion, should i carry on searching for a lamp
how much should it cost anyway?
or should i quit now?

by the way i checked all of the transformers and they all acted the same,
on one side 2 close pins showed 1.5kohms and the other 2 on the same side
showed the same, on the other side the 2 center pins showed 1ohm, the other ones on the same side showed nothing.

thanks you all for helping, even if i won't be able to fix that Tv,
i learned a lot reading here.

[multimeter]

Re: VESTEL 3208 Sound but no picture

can you put a picture of where you said a diode was cut,and also the point where the diode is on the solder side? for reference ,seems this guy may have taken what he needed for another tv,your secondarys seem ok on the inverter transformer,they are the ones that always fail beacause of the very thin windings,i think if you had the tube then it will fire up,but that all depends on what some one has taken away!,you could try ccfl warehouse for a tube they are recommended,but can be tricky to replace,i dont normally bother if it breaks then your stuffed,also the tubes contain mercury,not good!

[s_henya]

Re: VESTEL 3208 Sound but no picture

hey multimeter, thanks for the fast response!!

i've uploded a picture of the cut diodes,

by looking at other power supplys pcb on the net, it seems that not in all of them a those diodes exists.

by the way had one expirience in replacing a tube, on a 14" sony laptop.
i wouldnt do that again, no fram to the tube and super delicate. took me over an hour.

[multimeter]

Re: VESTEL 3208 Sound but no picture

hey multimeter, thanks for the fast response!!

i've uploded a picture of the cut diodes,

by looking at other power supplys pcb on the net, it seems that not in all of them a those diodes exists.

by the way had one expirience in replacing a tube, on a 14" sony laptop.
i wouldnt do that again, no fram to the tube and super delicate. took me over an hour.

not all supplys are filled where the legends are,just left empty,but that looks like someone has pinched the diodes the lazy way just snipped them off,be interesting to see what rail they are on and lead too,sorry im just rambling now...!

[fzr1000rexup]

Re: VESTEL 3208 Sound but no picture

Hi, my psu 17pw15-8 has 17v to inverter, knowing this should be 24v. I noticed 2 bad caps c806 and c851, all others appear to be fine, could this be the cause to low voltage.

Thanks for any help.

Paul

PS, I`ve got sound but no picture but after a few minutes on the screen a red tinge appeared..