[TechAssist] [Fwd: FIX: [Fwd: Mitsubishi (1985) CK-2575R no vert,outputs OK]]
- From: Phil Bader <philbad@xxxxxxxxxx>
- To: "techassist@xxxxxxxxxxxxx" <techassist@xxxxxxxxxxxxx>
- Date: Tue, 20 Nov 2001 09:38:46 -0500
-------- Original Message --------
Subject: FIX: [Fwd: Mitsubishi (1985) CK-2575R no vert,outputs OK]
Date: Tue, 20 Nov 2001 09:37:30 -0500
From: Phil Bader <philbad@xxxxxxxxxx>
Organization: Jan Phyl TV Inc. Winter Haven, Fl. Estab. 1976
To: Phil Bader <philbad@xxxxxxxxxx>
References: <3BF551A3.3F6A62F9@xxxxxxxxxx>
(See thread below)Had no video,no sound, slick raster, and reduced vert
deflection,then after 30 seconds just a line. Found the flyback's pin
#10 voltage source, Diode D553 shorted (264P102020,RU3B, NTE552),and
it's resistor in series open, R553 (1.2 ohm, 1/4 watt). Replaced both,
still measured a short at cathode of D553 indicating a short down stream
that caused these supply source parts to toast.Traced short to other
side of board, through a darkened (but good 15 ohm, 1 w) R709 (located
mid-board)on to the actual culprit,shorted electrolytic cap C737,(1000
mfd@ 16V) next to tuner.Replaced cap.TV powered up with good video,sound
and tunung,but slight vertical linearity distortion at top. Recapped the
vertical, C414(3.3/50V),C410(10/50V),C411 (4.7/250v),C412 (100/100v).
Since vertical was stressed, I replaced the pair of vert. outputs
Q401,Q402 (both 2SC2073, NTE375)as precaution. Found/replaced also C582
(1 mfd/50V Bi-Polor) that esr'd poor in horizontal. I ESR caps all over
the board on older TV's as good measure with my beloved Dick Smith ESR
meter. Greyscaled tracking and looks like new. Money in pocket, out da
door.Thanks, folks for all the assistance.
Phil Bader wrote:
>
> -------- Original Message --------
> Subject: Mitsubishi (1985) CK-2575R no vert,outputs OK
> Date: Fri, 16 Nov 2001 12:48:48 -0500
> From: Phil Bader <philbad@xxxxxxxxxx>
> Organization: Jan Phyl TV Inc. Winter Haven, Fl. Estab. 1976
> To: "CONSUMERELREPAIR-L@xxxxxxxxxxxxxxxxxxxx"
> <CONSUMERELREPAIR-L@xxxxxxxxxxxxxxxxxxxx>
>
> Customer said had narrow vert, then smoked. I got a narrow pix for a
> minute then a line. I changed the good vert outputs as test
> (Q401,402),same. I injected a vert drive signal at pin 14 ( vert drive
> output pin from IC)of IC201 deflection IC and got vert deflection,tho
> distorted.Inspection found burnt resistor R553 and diode D553 off pin 10
> of fly.Don't know what supply source this is. Measured a dead short at
> cathode,so did not fire up TV. Traced to toasted 1 watt R709 across
> board. I need parts ID and help, as no sams exist.thanks.
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