TV will not power on. First disconnected red HV to splitter and tried
to power on. No luck. Next checked HOT for short, none found. Checked
voltage at collector of hot. Voltage shot up to 220 volts and then
trickled down to zero. The set does make a chirp sound when first
plugged in followed by 7 to 10 clicks and then nothing else happens.
Any ideas were to go from here? I would really appreciate any help. Are
there any other checks I should make or start replacing c4103, cr4101
cr4106 cr4118 cr4108?

Shallowrunner.

wrote:
TV will not power on. First disconnected red HV to splitter and tried
to power on. No luck. Next checked HOT for short, none found. Checked
voltage at collector of hot. Voltage shot up to 220 volts and then
trickled down to zero. The set does make a chirp sound when first
plugged in followed by 7 to 10 clicks and then nothing else happens.
Any ideas were to go from here? I would really appreciate any help. Are
there any other checks I should make or start replacing c4103, cr4101
cr4106 cr4118 cr4108?

Shallowrunner.

You need only measure the voltages on cr4116 and cr4118 with the tv
turned OFF in standby. The 15 volt line should be 13.4v-15v and the
143v line should not be over 148v.

If those are high then the standby regulation stage is bad in the main
smps and nothing else you check will matter. Typically the 2.2uf cap
near the smps ic is the culprit if both voltages are reading a bit
high.

If the 143V line is high and the 15v line is low, then cr4118 is bad.

Be aware that if this is the rptv, then the high voltage turn on
attempts probably damaged the high voltage splitter and it may need
replaced, but fix the supply first.

Thanks for the response. I will go check this now. I will post my
findings. I hope that you can help me resolve this issue. I really
appreciate it.


Shallowrunner

dkuhajda,

I measure across diode cr116u (I assume this is 4116 since it is in the
4000 Deflection region) It is located next to C7. When I plugged the
power cord in, it shot to 200vdc then slowly dropped off to 0 volts. I
then measure across cr118 (again assume it is 4118) it was located next
to TP4102 and near transformer 4102. It measured 10.79 when I plugged
in the power cord. So does this mean that cr4118 is bad? Why doe 4116
spike to 200v and then drops off to zero volts? So is next step to
replace cr4118 and HV splitter?

I think I may of measure cr117 instead. I placed my leads across cr118u
and plugged in the set. I mentioned that I hear the clickings sound
when I plug in the set....well cr118u spiked to around 13 vdc with
every click. Once the clicking stopped...then the voltage of cr118u
went to zero volts. Does this sound right. cr118u is at the top left
corner of T4102.

Shallowrunner

I am not sure what you are measuring because you should not be
measuring across any of the diodes as those will always be 0.7-0.9v the
forward voltage drop of the diode.

If the tv is trying to trun on and going into protect shutdown, then
everything will go to zero. You need to make sure the tv is not trying
to turn on at plug in.

Change these first! Then continue!

CR4118 should always be changed if it's the original one...it will check
good but break down under load.

See this list of part that must be changed on these for reliable operation &
is considered a general tune up for any CTC169 chassis......this is a good
place to start.

---------------------------------------------------------------
Text pasted from WinSTIPS 2.0
http://www.ServiceSoftware.com
---------------------------------------------------------------

RCA CTC169

Common Failure



When Working On Any Of The Ctc169 Chassis Replace The Following If They Are
The Original Parts.
Cr4118 (Ecg580 Or Equiv)
C4102 2.2uf 100v
C4104 15uf 63v
C4108 47uf 50v ( Sometimes This Is A 39uf)

---------------------------------------------------------------


--
==========================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
860-399-1861
860-664-3535 (fax)

========================

wrote in message
oups.com...
TV will not power on. First disconnected red HV to splitter and tried
to power on. No luck. Next checked HOT for short, none found. Checked
voltage at collector of hot. Voltage shot up to 220 volts and then
trickled down to zero. The set does make a chirp sound when first
plugged in followed by 7 to 10 clicks and then nothing else happens.
Any ideas were to go from here? I would really appreciate any help. Are
there any other checks I should make or start replacing c4103, cr4101
cr4106 cr4118 cr4108?

Shallowrunner.

dkuhajda...I was measuring at TP4101 for B+. I was looking for 3403
ground but could not find it so I used the cathode side of a diode. Not
sure if this is right. . I also measured TP 4103 for +15 volts and
used a diode cathode as ground. I had the same results. B+ spiked to
220 volts and drifted to zero within 2 minutes. TP4103 spiked to 13
volts with every click the unit made and then after all clicks, stayed
at zero. Am I testing this wrong? I am only plugging in the cord. I am
not powering up the unit.

Thanks for you help.

Shallowrunner

Thanks Jeff, I will try that and post my results. Am I checking the B+
correctly? I am using test point 4101 and using the cathode side of a
diode. I could not find a ground pin persay.

Shallowrunner

wrote:
Thanks Jeff, I will try that and post my results. Am I checking the B+
correctly? I am using test point 4101 and using the cathode side of a
diode. I could not find a ground pin persay.

Shallowrunner


Update....

Let me tell you what I did...and then maybe you can tell me what I need
to do next. For some reason...the B+ was spiking to 220 volts and
drifting to zero. I measured this at test point 4101 and I also measure
the +15 and it was no where near there. I used the negative leg of an
electrolytic cap for ground. I replaced cr4118, c4102, c4104 and c4108.
I then rechecked B+. It was at 139 vdc standby and at 141.5 when I
turned the unit on. Well....Let me rephrase that. I have the box out of
the projection tv. I used the remote to turn the unit on and it sounded
like it came on. However, I had no picture or sound (sound I guess
because of no speakers) and no picture because I am thinking that the
spike in dc voltage damaged the HV splitter. Am I correct on all this?
What would be the next step? I would think that replacing the HV
Splitter is all the unit would need left, but then again, I am not TV
technician just someone who likes a challenge and a do it yourselfer. I
sure would like to be cuz this is cool (and dangerous). Can you please
help me finish this unit up?

Clip your ground lead to one of the RCA jacks ground ring or the CRT ground
strap.


--
==========================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
860-399-1861
860-664-3535 (fax)

========================

wrote in message
oups.com...

wrote:
Thanks Jeff, I will try that and post my results. Am I checking the B+
correctly? I am using test point 4101 and using the cathode side of a
diode. I could not find a ground pin persay.

Shallowrunner


Update....

Let me tell you what I did...and then maybe you can tell me what I need
to do next. For some reason...the B+ was spiking to 220 volts and
drifting to zero. I measured this at test point 4101 and I also measure
the +15 and it was no where near there. I used the negative leg of an
electrolytic cap for ground. I replaced cr4118, c4102, c4104 and c4108.
I then rechecked B+. It was at 139 vdc standby and at 141.5 when I
turned the unit on. Well....Let me rephrase that. I have the box out of
the projection tv. I used the remote to turn the unit on and it sounded
like it came on. However, I had no picture or sound (sound I guess
because of no speakers) and no picture because I am thinking that the
spike in dc voltage damaged the HV splitter. Am I correct on all this?
What would be the next step? I would think that replacing the HV
Splitter is all the unit would need left, but then again, I am not TV
technician just someone who likes a challenge and a do it yourselfer. I
sure would like to be cuz this is cool (and dangerous). Can you please
help me finish this unit up?