Hi,

PLEASE READ my original post below.

I have a RCA TV model 27V412T, chassis M134C (mfg 01/06) back in my shop,
which I thought I repaired after I replace the remote receiver. The TV worked
fine for a couple days, then it started all over again. I removed the remote
receiver and put a 10K from +5 to the remote's output line, but the TV
still turns on, then off by itself. I checked for leakage on the panel button
switches. Also I found out, before I removed the remote receiver, the TV
would not respond to remote commands, and the scope showed a good
output signal from the remote receiver. Note: The TV did respond to remote
commands when I first started working on it. I checked the +5V and scoped it
for noise.

I found info on the Web about a setting in the service menu that can cause
this problem, via "7", OPTM2 should be at "00", but this setting is correct
("00").

Did you have a similar problem with this or similar a model TV?

Thanks in advance, Brad

On Thu, 25 Oct 2007 14:25:39 GMT, in sci.electronics.repair you wrote:

Hi,

I have a RCA TV model 27V412T, chassis M134C (mfg 01/06) in my shop
that seems to have a mind of it's own. My customer said this problem got
worse over time (a few weeks). I have Sams Photofact 5234.

The TV will play for a short time, then turn off, a short time later, it
turns back on, then again it goes off, etc. I checked all solder joints
(AOK).

HV is 28KV, reg B+ is 130V "run", and 10V in standby.. While the TV
played, flexing the circuit board (removed from it's holder), tapping the
circuit board, using a hot air gun on parts, had no effect.

I checked electroylitics in primary side of SMPS and reg. B+ (AOK).
I checked voltages on secondary side of SMPS and found a schematic
error for 24V source. I found 24V present at emitter of Q205 used as a
"switch" (one of several) which indicates the 24V source is normal.

Did anyone encounter a similar problem?

Thanks in advance, Brad

Before you type your password, credit card number, etc.,
be sure there is no active keystroke logger (spyware) in your PC.

"Brad" wrote in message
...
Hi,

PLEASE READ my original post below.

I have a RCA TV model 27V412T, chassis M134C (mfg 01/06) back in my
shop,
which I thought I repaired after I replace the remote receiver. The TV
worked
fine for a couple days, then it started all over again. I removed the
remote
receiver and put a 10K from +5 to the remote's output line, but the TV
still turns on, then off by itself. I checked for leakage on the panel
button
switches. Also I found out, before I removed the remote receiver, the
TV
would not respond to remote commands, and the scope showed a good
output signal from the remote receiver. Note: The TV did respond to
remote
commands when I first started working on it. I checked the +5V and scoped
it
for noise.

I found info on the Web about a setting in the service menu that can
cause
this problem, via "7", OPTM2 should be at "00", but this setting is
correct
("00").

Did you have a similar problem with this or similar a model TV?

Thanks in advance, Brad

On Thu, 25 Oct 2007 14:25:39 GMT, in sci.electronics.repair you wrote:

Hi,

I have a RCA TV model 27V412T, chassis M134C (mfg 01/06) in my shop
that seems to have a mind of it's own. My customer said this problem
got
worse over time (a few weeks). I have Sams Photofact 5234.

The TV will play for a short time, then turn off, a short time later,
it
turns back on, then again it goes off, etc. I checked all solder joints
(AOK).

HV is 28KV, reg B+ is 130V "run", and 10V in standby.. While the TV
played, flexing the circuit board (removed from it's holder), tapping
the
circuit board, using a hot air gun on parts, had no effect.

I checked electroylitics in primary side of SMPS and reg. B+ (AOK).
I checked voltages on secondary side of SMPS and found a schematic
error for 24V source. I found 24V present at emitter of Q205 used as a
"switch" (one of several) which indicates the 24V source is normal.

Did anyone encounter a similar problem?

Thanks in advance, Brad

Before you type your password, credit card number, etc.,
be sure there is no active keystroke logger (spyware) in your PC.

Yes. Set would turn itself on/off at random, sometimes the front panel
controls would work, other times they wouldnt,
erratic operation using the remote.
Some one had gotten a bit wild with the Windex, which had run down the
screen and dripped on the control panel and switches. Replaced the control
panel with one out of a junker, not a bit more trouble out of the set, no
customer return.
HTH

On Nov 5, 5:18 pm, (Brad) wrote:
Hi,

PLEASE READ my original post below.

I have a RCA TV model 27V412T, chassis M134C (mfg 01/06) back in my shop,
which I thought I repaired after I replace the remote receiver. The TV worked
fine for a couple days, then it started all over again. I removed the remote
receiver and put a 10K from +5 to the remote's output line, but the TV
still turns on, then off by itself.

micro bad