[TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A - Dead - S...
- From: Philstv@xxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 15 Oct 2005 14:00:25 EDT
Could be a supply diode breaking down or possibly a leaky input filter. RCA
was known for bad input filters around or just before this time.
Phil Solarz
Phil's Electronics
RAC-National Product Service
C.E.T. # GNN3799
In a message dated 10/15/2005 1:52:09 P.M. Eastern Daylight Time,
tvman@xxxxxxxxxxxxxxx writes:
Hi David one of the diodes in the bridge maybe breaking down, Eric,
Eric
E M Electronics
59 Wights Rd
Deer Lake NL
Canada
A8A 2J2
Ph# 709 635 2627
tvman@xxxxxxxxxxxxxxx
David Lessard wrote:
> While digging a bit deeper I decided to monitor the raw 150V +B which is
> derived via bridge rectifier consisting of CR101-CR104, this bridge's AC is
> supplied via 2.7ohm/15w resistor R102. Anyway while monitoring the 150VDC I
> noticed that evertime the TV tried to fire-up the raw +B would drop
> dramatically, almost in half before it would "click" - "shutdown" and start
> the cycle again. I suspected R102 breaking down under load and swapped it
> with a known-good resistor, same problem!! Question is what would cause +B
> to drop dramatically? What is causing such a load? Again, I'm stumped but
> still digging. David Lessard, Alexandria, Ontario, mr_fixit@xxxxxxxxxxxx
>
> ----- Original Message -----
> From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, October 14, 2005 3:24 PM
> Subject: [TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A -
> Dead - Shorted HOT
>
>
>
>>Follow-up:
>>
>>Replaced HOT, and R426 horizontal drive +B, resistor value was up by
>>800ohms. TV pulses ON/OFF when ON" button is pressed, TV comes on for a
>>brief second as power cord is unplugged. I've replaced C672, C654 and
>
> C656.
>
>>When I disconnect RED wire on standup board next to VIPUR TV pulses
>
> ON/OFF.
>
>>What am I missing? What are the start conditions for this chassis to
>>fire-up? I know nothing about this 25 year old chassis. Thanks in advance.
>>David Lessard, Alexandria, Ontario. mr_fixit@xxxxxxxxxxxx
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