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Zenith SR3587DT Sound OK, No Picture????

M

Mike

Jan 1, 1970
0
im not sure where these are located.

Is the pin coil on that seperate little board to the right?

It didnt arc. yet.
 
S

Sofie

Jan 1, 1970
0
yea..... it's a real good price.... for the seller.
 
S

Sofie

Jan 1, 1970
0
William R. Walsh:
Your comment about "plug 'er in and see what smokes" reminds me of a
"technician" that once worked in my shop...... if he was troubleshooting a
piece of equipment that was blowing fuses, instead of actually doing some
real troubleshooting and component testing, etc.... he would install a much
higher rated fuse to see what smoked. Unfortunately with that method,
there are lots of (what were good) parts that get smoked too, which runs up
the repair bill, parts and labor.... and then the customer is not happy
with the final invoice amount and won't come back..... a lost customer for
sure.
The final straw that forced me to fire this "technician" was when he was
working on a very nice, high end stereo receiver that he was
"troubleshooting" ..... after he went home, I happened to glance a look at
the unit on his bench.... he had installed 2 cut-off 1/4" bolts where two 8
amp fuses were supposed to go. After he was fired the next day, I finally
got the unit going but tons of parts along with the pcb were fried, charred,
and smoked..... I ate the extra repair expenses to keep the customer
coming back.
William....in my opinion this is NOT good service practice..... just like
disabling speaker "protection" circuitry in amplifiers and disabling
"shut-down" circuitry when troubleshooting televisions. I have had stuff
come into my shop that had previous repair attempts by so called techs using
these methods..... and they left the circuitry disabled and butchered the
unit..... this could be a safety issue and a disaster if the subsequent
shop does not catch the modifications and do the repair job correctly.
 
M

Mike

Jan 1, 1970
0
Is the price too high or something? Could I get it cheaper if I ordered it
elseware instead of my local shop?
 
S

Sofie

Jan 1, 1970
0
Mike:
Obviously buying a replacement board will SPOIL your flawless 100% record
with your method of troubleshooting. .... and I am quoting you......
........ "I have fixed every TV i ran into so far."

Replacing entire circuit boards is almost never a cost effective option for
the service shop business, particularly if the board costs $158..... but if
it is for your own personal repair and you like your television and there
are NO other problems, especially with the CRT performance and
emissions...... ?
.... you will have to make that decision.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

snipped:
 
M

Mike

Jan 1, 1970
0
well, I called up another shop in my area, and they said that the whole
board needs replaced. The CRT gave a damn good picture before it went.

The picture tube didnt gass out, I know that, and I even tested the
filiment, and it lights normally.
 
M

Mike

Jan 1, 1970
0
the local shop I called up, said thats what they do. They told me that they
never really work down to the compnent level in zeniths, and told me i would
have to replaced the board anyway.

Quote from foley at teh shop: "Well, you can change the flyback, and I have
to warn you, you will end up replacing that whole board, Give me the zenith
part number, and I can quote you a price. blah blah blah"

so, hes fixed this type of set many times according to him.

Ill say one thing, of course he can fix it, if its a known good tube, sure
replaceing the board is going to fix the set, think about it.

anyway, FYI: i only ran into about 8 TVs, as the other tech i work with dont
work on direct view TVs. Hes the projection tech, but im not making much
money, and the repair business is not getting much business at all, so im
thinking about quitting and opening my own PC and electronics shop.

the Zenith is mine. I got it from a friend. he said a surge hit one day, and
knocked the horiz sweep out, which i dont believe him on that part, because
it was just a bad solder on the yoke return cap.

I resolder it, and the shaping coil or pin coil, or something among that
magnitude died, causing the flyback failure.
 
M

Mike

Jan 1, 1970
0
One last thing, its not the entire chassis i am replacing, it would be a
waste of time for that.

its just one module, called the sweep/smps board.

and if you think about it, technically, it will "fix" the set.

it sure wont be broken. it will work. so technically, its fixed.
thank you very much.
 
T

Tom MacIntyre

Jan 1, 1970
0
the local shop I called up, said thats what they do. They told me that they
never really work down to the compnent level in zeniths, and told me i would
have to replaced the board anyway.

Quote from foley at teh shop: "Well, you can change the flyback, and I have
to warn you, you will end up replacing that whole board, Give me the zenith
part number, and I can quote you a price. blah blah blah"

This is Zenith's warranty policy, and it flies in the face of common
sense. They repair to component level for the smaller sets, forcing a
shop to do a lot of work for little or nothing, while replacing for
the larger sets, forcing the shops to work for...little or nothing,
and have a lot of money tied up for months besides, from purchasing
entire assemblies, including CRT's. I have seen Zenith's policies, and
if you are not intimately familiar...you won't understand anyway.

Mike...time to wake up.

Tom
 
M

Mike Tomlinson

Jan 1, 1970
0
Mike said:
I just looked up some information, Im just going to replace the whole board.

Are you sure you're competent?

Could you learn to snip your quotes when posting? And stop top-posting?
 
M

Mike Tomlinson

Jan 1, 1970
0
Mike said:
im
thinking about quitting and opening my own PC and electronics shop.

God help your customers. With the level of clue you have demonstrated
to date, you'll go out of business very quickly.
 
J

Jason D.

Jan 1, 1970
0
Mike:
Obviously buying a replacement board will SPOIL your flawless 100% record
with your method of troubleshooting. .... and I am quoting you......
....... "I have fixed every TV i ran into so far."

Replacing entire circuit boards is almost never a cost effective option for
the service shop business, particularly if the board costs $158..... but if
it is for your own personal repair and you like your television and there
are NO other problems, especially with the CRT performance and
emissions...... ?
... you will have to make that decision.

True, I have to replace a whole board on occasion and luckily the
owner footed the cost, set was hacked by idiot "tech" or was covered
under warrenty.

Related to this topic:
I once quoted for my tv project an whole AV-20D303 chassis. GLUPS,
400! This is an power efficient chassis that should consume less than
80W on 20" this chassis is also used in AV-27D303 which only consumes
105W using RCA 27" CRT. The RCA CTC203 based 27" is about 130W or so.

Most of power losses comes from linear regulators (any) or older
SMPSes. Looks like I would have to design in an switching SMPS in
place of STR30134 regulator on an AV-20200.

Cheers,

Wizard
 
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