[TechAssist] Re: RCA Proscan PS36109 CTC197CH dead - flyback pn 237506 FYI
- From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 4 Aug 2003 13:34:53 -0500
I will add the following:
IHVT 237506 2 good units measured.
Pins 2-3 ring 57, 54 on the z-meter. Measures 2.77, 2.85 mH
Pins 1-2 ring 29, 25 and measures 1.49, 1.43 uH
Pins 1-3 ring 57, 54 and measures 2.52, 2.64 mH
Pins 6-10 ring 48, 41 and measures 530, 540 uH
On the TVA
Pins 1-3 ring 30, 31
Pins 1-2 ring 14, 16
Pins 2-3 ring 30, 32
Pins 6-10 ring 36, 36
Pin 5-anode leaks 2 mA
BAD UNITs z-meter
pins 2-3 ring 19, 40
pins 1-2 ring 2, 17
pins 1-3 ring 18, 39
pins 6-10 ring 7, 30
On the TVA
Pins 2-3 ring 15, 27
Pins 1-2 ring 0, 11
Pins 1-3 ring 14, 26
Pins 6-10 ring 0, 26
Wayne Vanaman
Omega Electronics
6904 W Fairfield Dr
Pensacola, Fl. 32506-3310
Wayne@xxxxxxxxxxxxxxxxxxxxx
WWW.PensacolaTVRepair.Com
850-456-5995 voice
850-458-6369 fax
----- Original Message -----
From: "Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, August 04, 2003 12:36 PM
Subject: [TechAssist] RCA Proscan PS36109 CTC197CH dead - flyback pn 237506
FYI
> I thought this one was worth noting. Came in dead, flyback was the
problem.
> What is notable here is that the flyback tests between the new and old
parts
> were so similar and potentially confusing. I use a Sencore TVA92 and test
> flybacks with the 25Vpp key pulse applied to the primary and look for the
> appropriate DC voltage on the anode per the Sencore chart. This is
usually
> a very good test.
>
> In this case, the old FBT tested with 430 VDC output, while the chart
> suggested about 600VDC. There was also 160Vpp on the anode lead, a little
> higher than I typically see. No problem, probably a leaky diode in the HV
> rectifier stage, ordered a new one. The new one came in ad tested as
> follows with the same input:
>
> 120Vpp & 504 VDC.
>
> The set works fine with the new one. For those of you who use the Sencore
> test, it is worth noting that the actual output of the FBT was quite a bit
> lower than the chart suggests. I have found this with some Sony
> transformers as well. It can lead to a misdiagnosis of a FBT problem. It
> seems like a good idea to start testing new FBTs when we put them in and
> posting any such results for others to refer to when troubleshooting.
>
> Sorry I have been absent from the list a lot lately...overloaded with
> lightning damage and sick kids...
>
> Leonard G. Caillouet
> Electronics World
> Gainesville, FL
> 352-332-5608
> 352-332-5668 (fax)
>
>
>
>
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