This set is totally dead. I did the repairs on L14101

Hi Lance,

Ah.

Power supply chirps when line cord is plugged in.

Like normal start up? Are you getting correct voltages in standby
for appox 140V B+, etc?

The 5v regulated voltage is present at all times. When the power button is
pressed the 2.5v appears on j13301 pin 18 and the 12v appears on the 12v
regulator u 14404. Both voltages disappear within a second or two and they
do not pulse they just die. Set has to be unplugged before it will respond

This is unusual, RCA designed this way to try 3 times for any reason
even x-ray shutdown. You will hear 3 clicks from relay.

Do you happen to have plug in F2PIP module in this chassis? Remove it
and try again. Sometimes this hangs the I2C data bus due to loss of
3.3V on that F2PIP regulator circuit, somewhat rare. I came across
this 3
times so far, was cracked solder joint on one SMD resistor that sets
the voltage for the LM317 regulator. But it usually causes 3 strikes
and out syptom.

with startup surge. On the collector of the horizontal output is 138v
regulated voltage.

Good!! Power supply is fine, this confirms it. Go on to other
areas.

Could this be a problem with the Gemstar module as
system control is integrated to it or do I have a data clock line problem.
I unplugged j13104 to try and isolate problen and had the same results on
the above tests.

Is it dumb or smart chassis? Smart chassis uses only one ribbon for
gemstar and can be left off. Two big ICs (jungle & micro).
Dumb chassis relies on gemstar (has two ribbons) and only one jungle
IC. The micro is part of gemstar, hence the dumb term.

Cheers,

Wizard