looking for emerson service manual - not owners manual.

[dacflyer]

nope, just a plain 13" tv
i wonder if the v-chip makes the set die after a certain time, like after all the promotion time is over, or something like that
a set that only plays for a certain time, then it just quits.
that possible ?

[CeaSaR]

Did you try to find anything for similar such as the "Spongebob", "Mickey",
"Minnie", "Cars", "Hanna Montana" et.al.? I see them all over the place.

Good luck.

CeaSaR

[Bigglez]

well its really weird, the PS is dead, its a switcher, no opto isolator type, just a feedback resistor, i have checked everything in the ps, and still cannot find out why it will not fire up..everything checks out ok, theres not much to it.

If the B+ Switcher supply is sync'd to TV scan rate
(or a harmonic) expect to find a drive signal going
into the PS section. Without it the PS may never start...

[Bob Scott]

If the B+ Switcher supply is sync'd to TV scan rate
(or a harmonic) expect to find a drive signal going
into the PS section. Without it the PS may never start...

I remember Sony had a KV1710 TV / CVM1710 monitor like that 35 years ago. The power switch caused a current rush in a cap to rapidly "kick" the horizontal oscillator into operation. Without that, the set would not power up, because the horizontal section supplied power to everything.

But the problem here is that the set quits after it successfully powers up. It could be a thermal shutdown somewhere, but I'm probably wrong. I think this type of problem will only be solved by the troubleshooter himself armed with a diagram.

What's a "jungle chip"?

[Bigglez]

Without that, the set would not power up, because the horizontal section supplied power to everything.

But the problem here is that the set quits after it successfully powers up.

Killing the H sync to the PSU would be an effective
way to include any number of safety cut outs. Perhaps
the PSU is being shutdown (through sync loss) because
of another issue?

What's a "jungle chip"?

Any analog or mixed signal IC that displaces a
bunch of parts. The convoluted IO pins and signals
make the schematic look like jungle vegetation.

One Japanese TV I encountered has a daughter
PCB in early serial numbers as the 'jungle IC'
was late. Latter versions had a DIP plastic part
and no daughter card. Mid 1970s view of the world..

[Bob Scott]

What's a "jungle chip"?

Any analog or mixed signal IC that displaces a
bunch of parts. The convoluted IO pins and signals
make the schematic look like jungle vegetation.

One Japanese TV I encountered has a daughter
PCB in early serial numbers as the 'jungle IC'
was late. Latter versions had a DIP plastic part
and no daughter card. Mid 1970s view of the world..

Hmm. I drifted out of consumer electronics products in 1983. I don't recall "jungle chips". Aha! I found the TDA8302 specs:
http://www.datasheetcatalog.org/datashe ... 6078_1.pdf

Thanks

[Bigglez]

I don't recall "jungle chips".

Google It!

[dacflyer]

still no luck...

if something is shutting down the PS, i cannot find it.. theres not even a start up pusle detected to the drive of the PS transistor/mosfet
i cannot even get stand by voltage..the ps delivers that also..
the ps looks as if its a stand alone circuit..but it only has a 5 meg resistor from secondary to primary windings. i guess it acts something like a opto would in a more common ps. but theres nothing.. Grrrrr