[TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A - Dead - Shorted HOT
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 14 Oct 2005 23:19:25 -0400
open filter cap perhaps? try scoping the B+ for ripple.
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
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
>>
>>----- Original Message -----
>>From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
>>To: <techassist@xxxxxxxxxxxxx>
>>Sent: Monday, October 03, 2005 9:57 PM
>>Subject: [TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A -
>>Dead - Shorted HOT
>>
>>
>>
>>>Yes.
>>>Dead,5A fuse blown. Fix: Shorted cap C425 (043uf@200V) yoke return I
>>
>>think.
>>
>>>After you get it on, here's some issues you may face:
>>>Brightness a bit exessive,retrace: C122 (30uf@250V) front of flyback.
>>>Raster narrow at sides, slight bow: Q1 on pincushion upright board near
>>>rear of chassis. RCA#146847/2N2222A,checks OK-replace it.
>>>Channels 2-6OK, no 7-13. Open and resolder all stakes inside the MTT001
>>>module.
>>>Bands of interference (two) slowely moving up thru picture.: Inside the
>>>MTT001A, change C654(100uf/16v),C672(220uf/25V),C656(330uf/10V).
>>>Immediate shut down at turn on:Flyback bad.
>>>Vert. retrace at top inch of screen.All assoc. caps seem to ESR OK.
>>>R506(6800ohm/2W) runs hot normally.Remove,scrape leads and resolder.
>>>Left side jailbars: Workaround: Add a 10uf/250V cap across CRT's PC
>>>board's stakes, pos. to "C6", neg to "Z1".(saves pulling chassis)
>>>Excess brightness: C122 (47uf@250)
>>>Unusual brightness issue: Increase brightness with control,all sudden at
>>>max: R721 (680ohm) increased to 690ohm. Also: Q703 shorts
>>>(#143806/NTE159).HTH.
>>>Phil
>>>
>>>Philip Bader
>>>Jan Phyl TV Inc. (estab. 1976)
>>>3420 Recker Hwy. Winter Haven, Fl. 33880
>>>Fax (863) 299-8821
>>>email: tjanphyl@xxxxxxxxxxxxxxx
>>>personal/ alt. email: pbader@xxxxxxxxxxxxxxx
>>>see our ad at:
>>>
>>
> http://jan-phyl-television-pc-monitor-service.9601288257006.worldpages-ads.c
>
>>om/
>>
>>>
>>>
>>>David Lessard wrote:
>>>
>>>
>>>>This TV has a shorted HOT (C1308K), main fuse is blown. Are there any
>>
>>common problems besides a bad flyback which could cause this?
>>
>>>>Thanks in advance,
>>>>David Lessard
>>>>Alexandria, Ontario, Canada
>>>>mr_fixit@xxxxxxxxxxxx
>>>
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