[TechAssist] VS4551 mitsubishi ,no power up when cold: only thump-thump. still not fixed
- From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: "techassist@xxxxxxxxxxxxx" <techassist@xxxxxxxxxxxxx>
- Date: Sat, 05 Mar 2005 10:54:52 -0500
ARRRRG! I watched this set an hour last night, unplugged it, went home.
This morning, again, plugged it in cold, pushed power: "Thump-Thump..."
Same crappola.
I immediately unplugged it, removed back, removed two screws holding the
chassis frame in. Plugged it in, powered it up perfectly.Then I flexed,
tapped,etc.No effect. I am still not sure if this is a borderline cap
discharging overnight and cooling(bad ESR) or some bad connection. I'm
stumped. I KNOW the cap i replaced last night was bad (see thread below).
Phil Bader
FIX?
I may have fixed the start up problem. I first replaced IC9A1 , an SE130
regulator.
But I then ESRd caps all over. I came across one cap soldered to the
bottom of the board to 5 pin regulator,IC9A2 (looked like soldered to
pins 1,2) It was a 4.7mfd@50V. It was totally open.
I replaced it.
Unit came right up with good picture.. Tomorrow morning will be the test
for the cold start.
Phil Bader
Phil Bader wrote:
>The fix for the "arcing" vertical distortion was not the yoke
>connection, but many cold solder joints on main board, especially the
>board yoke plugs. Can't believe I missed them all. Resoldered, fixed.
>I came in this morning, and the TV being cold and unplugged all night,
>pushed power and I only heard a once per second "thump-thump-thump"
>noise. We feel this may be one of the PS electrolytics with hi ESR, and
>when cold, does this but if warms up, runs OK.
>Anyone have any specific tech tip on this model for this???
>This will be #3 repair to get this out the door!
>Phil Bader
>
>This played two days OK. Then the vertical distorted like arcing,
>pull-up, lines stretched,bowed etc.
>I did resolder the vert output IC. If I hit the side of the setwhile
>happening it cleared.
>I saw somewhere in a fix email,was to solder the yoke pin.Sounded like
>they meant actually at the yoke (as opposed to on the board) I quote:
>
>"Cure: Found bad solder connection at connector on red yoke. Reason for no
>deflection is these connector run in seres to the other two CRT's."
>Anyone care to clarify this?
>Phil Bader
>
>
>
>
>
--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
--
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