RCA F20637ET

R

Ron Johnson

Guest
Has anyone seen an RCA F20637ET television that was totally dead? I don't
have a schematic but looked over the pc board and checked a few components:
nothing obvious. Would appreciate any suggestions and/or a schematic if it
could be emailed or faxed.

Thanks,

--
Ron C. Johnson A.Sc.T.
Office: 306 665-1610
Fax: 306 665-1615
Mobile: 306 229-9842
 
Seen lots of RCA tv sets that were dead with LOTS of different causes.
The most important information you did not even post, the chassis number.
Standard tv troubleshooting is in order, once that is complete post the
results if you are still clueless as to where to go next.
The schematic will need to be purchased from any Thomson authorized
servicer.
David

Ron Johnson <ronjohnson@sasktel.net> wrote in message
news:vrl6ii4t26opa3@corp.supernews.com...
Has anyone seen an RCA F20637ET television that was totally dead? I don't
have a schematic but looked over the pc board and checked a few
components:
nothing obvious. Would appreciate any suggestions and/or a schematic if it
could be emailed or faxed.

Thanks,

--
Ron C. Johnson A.Sc.T.
Office: 306 665-1610
Fax: 306 665-1615
Mobile: 306 229-9842
Click to expand...
 
On Tue, 18 Nov 2003 16:09:34 -0600, "Ron Johnson"
<ronjohnson@sasktel.net> wrote:

Has anyone seen an RCA F20637ET television that was totally dead? I don't
have a schematic but looked over the pc board and checked a few components:
nothing obvious. Would appreciate any suggestions and/or a schematic if it
could be emailed or faxed.

Thanks,
Click to expand...
Ron,

Yes, this is caused by bad grounds in both microcontroller shield
surround & tuner can that corrupted data in this eeprom IC. Fix both
by resoldering carefully the microcontroller shield and remove bottom
tuner cover and resolder all grounds. Then write down complete model
number (service model) & chassis number also serial number. Then also
unsolder small IC 8pin and take this IC and piece of paper you wrote
down to RCA authorized shop and have them reinit this IC with this
paper info. You might be lucky the tuner settings stored in eeprom is
intact. If not, just bring back the "now working" tv back to shop and
they will realign the tuner. Or use the tv with video & audio inputs.

The details on this tuner problem and solutions is at repairfaq.org
under the tuner problem on CTC177 or like.

Cheers,

Wizard
 
....and if the shop has any sense at all they will say that they won't work
on it without re-doing all of the work you just did themselves to be sure
that it was done correctly. And if you are lucky you won't bridge any
connections that are supposed to be discrete when soldering the tuner. And
if you are lucky you won't have any other problems that need real
troubleshooting. etc...

Take the unit to a shop with the right equipment and experience with your
chassis. you will save yourself headaches and likely some money. There is
a lot of homework to do before anyone can offer you any sound advice.

Leonard Caillouet

"Jason D." <jpero@sympatico.ca> wrote in message
news:3fbaccff.9043859@news1.on.sympatico.ca...
On Tue, 18 Nov 2003 16:09:34 -0600, "Ron Johnson"
ronjohnson@sasktel.net> wrote:

Has anyone seen an RCA F20637ET television that was totally dead? I don't
have a schematic but looked over the pc board and checked a few
components:
nothing obvious. Would appreciate any suggestions and/or a schematic if
it
could be emailed or faxed.

Thanks,

Ron,

Yes, this is caused by bad grounds in both microcontroller shield
surround & tuner can that corrupted data in this eeprom IC. Fix both
by resoldering carefully the microcontroller shield and remove bottom
tuner cover and resolder all grounds. Then write down complete model
number (service model) & chassis number also serial number. Then also
unsolder small IC 8pin and take this IC and piece of paper you wrote
down to RCA authorized shop and have them reinit this IC with this
paper info. You might be lucky the tuner settings stored in eeprom is
intact. If not, just bring back the "now working" tv back to shop and
they will realign the tuner. Or use the tv with video & audio inputs.

The details on this tuner problem and solutions is at repairfaq.org
under the tuner problem on CTC177 or like.

Cheers,

Wizard
Click to expand...
 
Ron Johnson:
Please be aware that the problem and symptom that you described "totally
dead" could be caused by literally dozens of different faults..... some
rather inexpensive and easy to fix, others much more difficult and expensive
to repair.
You would be best advised to take your television to a service shop for a
proper and safe repair. If you take it to the shop AFTER aborted or
botched home do-it-yourself repair attempts, the repair shop price will be
much higher. At the very least you should TAKE it to a shop for a repair
cost estimate so you can make an intelligent repair decision with facts
instead of Internet or telephone wild guesses. A real tech actually has to
get inside the television with test equipment to determine how involved the
repair will be.

NOTE: When someone posts on the group that they "looked over the pcb board
and checked a few components, nothing obvious" ...... that is really CODE
for I don't have the proper test equipment and tools, don't know how to use
them, don't have much repair experience or electronics knowledge, etc.

What exactly did you look over on the pcb board and what components did you
check, and what initial tests and basic troubleshooting did you do? How
obvious is a shorted diode, an open resistor, a shorted HOT, a bad flylback,
faulty EPROM, etc? ? ? Test equipment is needed and the knowledge and
experience to guide the troubleshooting effort. A schematic will be only
most useful to an experienced tech and just about totally USELESS to a
novice...... there are no step by step troubleshooting procedures in the
schematic.
There is a lot of troubleshooting and testing that can be done WITHOUT a
schematic.... most shop techs fix the majority of equipment that comes
across their bench without the schematics or manuals...... or at least
perform preliminary troubleshooting prior to obtaining it.
If you wish to research all of this you should go to the website for this
newsgroup at
http://www.repairfaq.org/
there, with some searching, you will find a wealth of troubleshooting tips,
repair procedures, component testing methods, and IMPORTANT safety
information that will help you to stay away from dangerous and lethal
electrical shock hazards inside your television.... note that these hazards
may still be present even when the television is turned off and unplugged
from the AC power...... be very careful.

My best advice is for you to take it to a shop right away.... it will be
better for your television and safer for you.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


"Ron Johnson" <ronjohnson@sasktel.net> wrote in message
news:vrl6ii4t26opa3@corp.supernews.com...
Has anyone seen an RCA F20637ET television that was totally dead? I don't
have a schematic but looked over the pc board and checked a few
components:
nothing obvious. Would appreciate any suggestions and/or a schematic if it
could be emailed or faxed.

Thanks,

--
Ron C. Johnson A.Sc.T.
Office: 306 665-1610
Fax: 306 665-1615
Mobile: 306 229-9842
Click to expand...
 
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