RCA CTC203 - deguass relay clicks

[Siggy]

Hi,
I have an F36649yx51 that won't turn on.
When power button is pressed the deguass relay
clicks 5 to 7 times and that's all.

I checked the voltage at the collector of the HOT Q14401 and it was
normal @ 140v.
I connected a light bulb in series between the collector of
the HOT and the flyback - it lit up and the relay clicked twice
(normal) and the power light stayed on but no HV.
I've replaced the flyback transformer T14401 - no change
When I unplug the CRT driver board there is no change.
I plugged the CRT driver board back in and disconnected the filament
on pin 10 and the power light stays on.
I don't know what to do next.
Has anybody had any experience with this failure before?


Regards,
Siggy

 

[[email protected]]

Hi,
I have an F36649yx51 that won't turn on.
When power button is pressed the deguass relay
clicks 5 to 7 times and that's all.

I checked the voltage at the collector of the HOT Q14401 and it was
normal @ 140v.
I connected a light bulb in series between the collector of
the HOT and the flyback - it lit up and the relay clicked twice
(normal) and the power light stayed on but no HV.
I've replaced the flyback transformer T14401 - no change
When I unplug the CRT driver board there is no change.
I plugged the CRT driver board back in and disconnected the filament
on pin 10 and the power light stays on.
I don't know what to do next.
Has anybody had any experience with this failure before?


Regards,
Siggy

What does the horizontal output drive waveform look like on the
o'scope?
Have you already removed, cleaned, and repaired the glue contaminated
connections to the coil on the base of the HOT?

 

[Art]

Had one the other day, the jungle chip was the culprit, no drive from it at
all.

 

[Jason D.]

Hi,
I have an F36649yx51 that won't turn on.
When power button is pressed the deguass relay
clicks 5 to 7 times and that's all.

I checked the voltage at the collector of the HOT Q14401 and it was
normal @ 140v.
I connected a light bulb in series between the collector of
the HOT and the flyback - it lit up and the relay clicked twice
(normal) and the power light stayed on but no HV.
I've replaced the flyback transformer T14401 - no change
When I unplug the CRT driver board there is no change.
I plugged the CRT driver board back in and disconnected the filament
on pin 10 and the power light stays on.
I don't know what to do next.
Has anybody had any experience with this failure before?


Regards,
Siggy

If this model have PIP feature (easily identified by looking at the
stand up module with A/V inputs) have large IC in the metal shield.
With LM317 regulator for 3.3V on steel heatsink at one corner. Look
at adjust pin of this LM317 for 2 SMD resistors. Resolder this SMD
two resistors.

Cheers, Wizard