[TechAssist] Re: RCA projection PKT169BNA, blue convergance way off
- From: Philip Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 14 Oct 2003 10:14:47 -0400
Blue CRT magnet (neck)slipped out of alignment?
Phil Bader
Gary McCartney wrote:
>
> I have this RCA projection, chassis PKT169BNA lightbox in the shop.
> (sorry I forgot to write down the TV model number). When customer showed
> me the convergance setup with the white cross on screen, the blue was
> way off, like 5 inches or more up and over to the left somewhat. This is
> the first CTC169 proj. I have had a convergance problem with so I'm not
> familiar with the circuits. I do have the manual though.
>
> I have pulled the main board with the convergance amp transistors on it
> and found that Q7036 is bad. I had to grind out the charred area of the
> pcb under Q7036 because it was black all the way through. Q7035 looked
> heated too so that will also be replaced. R7122 (1 Ohm 1W) looked
> stressed so I changed it, plus R7119 (2.2 Ohm 2W) was open. Haven't
> found any sign of other defective parts. The plug P7016 to the blue
> convergance yoke had got hot and deformed slightly at pin 1. I measured
> the resistance of the yoke and compared it to the red yoke, and all
> windings measure 1 ohm.
>
> Are there any other known suspect parts I should check out before I
> order the transistors?
>
> I also question the wattage rating on some of the resistors. Example:
> R7122 is rated 1W but it is the physical size of a normal 1/2 watt
> resistor. R7119 is rated 2W but it is the same physical size as R7122 or
> a normal 1/2 W resistor. I noticed some of the 1/4 W sized resistors are
> rated 1/2W. What is up with these ratings? If I go to replace the 2W
> resistor with another 2W from my stock, it will be twice or 3x the size
> of the original.
>
> Thanks for any help.
> --
>
> Gary McCartney
>
> McCartney Electronics
> Guelph Ontario Canada
> Est. 1984
> email: gary (at) number63.ca
>
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--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
For Professional Technicians Only
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