[TechAssist] update2. RCA F36444, ATC113CA1 dead. standby B+ OK no pwr on]
- From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: "techass >> \"techassist@xxxxxxxxxxxxx\"" <techassist@xxxxxxxxxxxxx>
- Date: Thu, 16 Jun 2005 11:43:41 -0400
Interesting developement:
I found a small 9 V regulator that did not have output: IV02.
I clipped my 9 volt bench supply to it and the set immediately powered
up. I heard high voltage and vertical running with black screen. I
remembered I installed a new fly, so I increased the G2 screen on it to
see a dim raster with no video, very narrow (6" each side), and about
20KV anode volts to CRT.
I realise this 9V regulator is fed by transistir TP340 which is biased
by TP531, who's base drive comes directly from the Gemstar module, but
think I have other isseis here?
I am "jury-rigging" it into coming on, but what do you think?
(especially the low HV@ 20KV?)
Phil Bader
Made sure the smps was up and OK. Replaced the Flyback, eeprom, HOT.
Resoldered the coils aroind the HOT.
Went to the Gemstar troubleshooting.
Checked ribbon cable BR104-pin 14 for +5.2 volts. It was there OK.
Next, check BR103-pins 10 and 12 (clock and data) for +5.0 VDC and 5VPP
signal.
I have neither.
Also said check BR104- pin 12 and 13 for signal when power is pushed.
Niether has signal.
Either omission I have is indication the manual says "replace gemstar"
So, replacing the gemstar is easy but does this cause other
complications (like alignments,etc when you replace an eeprom)?
My first Gemstar...
Phil
Plugged in,I have +139 VDC at collector of HOT in standby. I have +5VDC
at I/R detector. Either pushing power button, or with remote, no
response. HOT good, smps seems OK.
Resoldered LL04 coil to HOT base (like the CTC203), resoldered fly and H
drive transformer.
Not a peep when power pushed. Not the "three strikes" chirps. Nothing.
Phil Bader
--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
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