[TechAssist] Re: RCA-Proscan PS31122 CTC169EJ5 mutiple problems
- From: "DAMON BRUNGER" <damoneb@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 29 May 2005 08:47:51 -0500
2. Hard starting, appears to go into shutdown the first few attempts.
?
May be the 2.2uf or the 39uf/47uf caps in SMPS....also check the 15uf in
Smps as that is the overcurrent shutdown.
Also CR4118 2nd-ary diode is the 15V supply, known for shutting down the TV,
but very intermittantly and usually during "full run mode, or watching TV".
Common failures you probably already knew......
Check your 143V supply in standby and run modes, preferably with a scope and
see if the voltage is too excessive.
I think the SMPS shuts down in run at about 150 - 157 V and I've seen the
Standby at 170 or more and it still starts.....(but that's the 2.2uf causing
that, OR the Main 143V CAP dried out....C4120? 180uf/200V or
200uf/180V....seen 1 or 2 of these failed)
Damon Brunger
Telrad Electronics
Fort Wayne IN
----- Original Message -----
From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, May 28, 2005 4:07 PM
Subject: [TechAssist] RCA-Proscan PS31122 CTC169EJ5 mutiple problems
> RCA-Proscan
> PS31122
> CTC169EJ5
> MFD 1994
>
> Mutiple faults some I've fixed or bypassed others remain.
>
> Primary complaint has sound - no picture (notes: Has OSD, No PIP, Freeze
on
> PIP turns picture soild Grey raster)
>
> Appears to be PIP board, Bypassed with a 330uf cap on pin 1-3 of plug
P8002
> (Pin 1 +, about 4v DC between pins)
> Any good fixes for this board?
>
> Secondary faults not in orginal complaint:
>
> 1. Picture Blooms
> (C402 0.056 400v bulged) replaced stoped blooming
> 2. Hard starting, appears to go into shutdown the first few attempts.
> ?
> 3. Squaking audio on poor signal conditions
> ?
>
> Peter Oliver
> Tucson Radio TV
>
>
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