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Panansonic TAU series CT-32SX31CE Thought I got it fixed but now have new questions

J

Jason D.

Jan 1, 1970
0
Even after this repair, TV still will not start even SMPS starts but
shuts down after a second see that on scope for smps (not like a
direct short kind, SMPS runs for several seconds then slowly slows
down and stops. TV uses small AC standby transformer for micro, it is
working. LED power lights up then goes out, HOT is ok.

History and what was done to it:

TV HV won't start, SMPS shuts down like it does now.
Found R517 burned and D507 shorted. Replaced both also flyback with
the HV regulator transformer (baby flyback thing) as well. No luck
the R517 and D509 are still intact.

Anybody else?

Have no schematic and we don't deal with Panasonic like we used to in
past so getting schematic is not worth for us.

Much appreciated, don't want to repeat that NV-55BX4 incident. Grrr.

Cheers,

Wizard
 
J

Jerry G.

Jan 1, 1970
0
Do an ESR test on all the caps in the power supply and scan circuits. I am
sure you will find a number of them that are out of specs. If all the caps
are good, then you will have to invest in the service manual and sped some
time on it.

--

Jerry G.
==========================


Even after this repair, TV still will not start even SMPS starts but
shuts down after a second see that on scope for smps (not like a
direct short kind, SMPS runs for several seconds then slowly slows
down and stops. TV uses small AC standby transformer for micro, it is
working. LED power lights up then goes out, HOT is ok.

History and what was done to it:

TV HV won't start, SMPS shuts down like it does now.
Found R517 burned and D507 shorted. Replaced both also flyback with
the HV regulator transformer (baby flyback thing) as well. No luck
the R517 and D509 are still intact.

Anybody else?

Have no schematic and we don't deal with Panasonic like we used to in
past so getting schematic is not worth for us.

Much appreciated, don't want to repeat that NV-55BX4 incident. Grrr.

Cheers,

Wizard
 
J

Jason D.

Jan 1, 1970
0
Do an ESR test on all the caps in the power supply and scan circuits. I am
sure you will find a number of them that are out of specs. If all the caps
are good, then you will have to invest in the service manual and sped some
time on it.

True on the schematic problem is we only do very rarely service those
newer sets like this. And panasonic pulled out on us few months ago
because we don't do enough sets even we did do top notch job on these.

So if I need info or parts I have to contact panasonic with component
locations and order parts. We only did about 5 old and new in 12
month period. That's really few.

On the caps on Tau, that's again true, in my experience Pansonic used
really good caps stuff especially if the circuit design is cool.

I got info from one other to check other items, Whew, that model
likes to have so many bad resistors and one small cap.

My rant:

Just that, I am now wondering where RCA is going. Their sets is
getting junkier again and cheap on packaging parts. I just got a 3.3V
micro IC bare (big one inside the tin box of ITC222 chassis) with bent
pins rattling around in that little RCA's red cardboard box without
anything else to protect that IC. That is what Citizen does but I
know RCA does best job on parts but now this one!? Oh, one more,
there was a good part # but their dept discountined it less than a
year for common 27" ITC008 chassis. RCA?!

Also the RCA new component numbers types, 3 even 4 different types of
fasteners on same TV, Quirky chassis design that is completely
different way to pull out to service position, quirky ribbon
connectors that you have to be so careful not to break those tiny
plastic nubs off. really hate that. No sense of everything. Before
ATC came, their CTC stuff were fine and had wonderful time working on
it, I do have go looking forward to work on those CTC stuff. They
were so predictable and easy to work on.

At least JVC doesn't change too much on theirs chassis access too much
which is great for me.

Even Citizen is fine chassis to work on and actually is one of those
brands with least problems as well as JVC and few others because we do
keep stats on all brands we service and was least troublesome to
diagnose.

Samsung is great on parts for their projector, just recently I
serviced one HCN 42" size model, this model has convergence amps
mounted high up on the steel frame on small board. This was on
replacing CRT and set of CRT boards (that set includes focus divider
block!!) to save labor time and cost is minimal. Cost was inexpensive
and easy to set up. That model did have convergence rings on their
yokes. The CRT assy came in complete ready to put in (Yoke, Lense and
all for about 250cdn) Unbelieveable.

That RCA takes that cake for hard to service and shoddy parts for bad
prices on newer chassis since ATC begun which is last year! :-O

Their idea of plastic cabinet and need 100 T20 screws to take apart is
nuts and have to lug big bases (aka light boxes) here and they're
awkard to store compared to square and retangular light boxes of old.

Oh, watch out for ITC008 chassis that has this cable that connect both
chassis to the pincushion daughterboard, they're sneaky, touch that
and problem is gone for days. Complaint is intermittent shut downs,
less common is intermittent width. Solution: Cut ends off and remove
pins, solder wires directly. That cable is made up of two brown and
one blue wires with plugs at each end, usually black or cloudy milky.
The problem lies with crimps on too small gauge wires. Watch out that
cable isn't straight through. 1 and 3 pins are reversed, pin 2
straight through.

No, this cable issue is not in part-finder's bulletin. It is like
L14401 thing, sneaky but much worse and fairly common.

Cheers,

Wizard
 
M

Mike Tomlinson

Jan 1, 1970
0
Jason D. said:
Even after this repair, TV still will not start even SMPS starts but
shuts down after a second see that on scope for smps (not like a
direct short kind, SMPS runs for several seconds then slowly slows
down and stops.

Suggests lack of load to me. Check around for more open fusible
resistors, etc.
 
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