[TechAssist] Re: Need VS-4544 schematic
- From: Paul <dntwntv@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 23 Jan 2006 18:21:22 -0800 (PST)
Tom
The print does not give a value for R5A28 in the VS4544. It does give a
value of 39K for a VS 4545. The other side of that resistor goes to cathode of
D5A22. The anode of that diode goes to cathode of D5A21 anode to ground. That
diode may be shorted. I can copy this section and send it to you if you want.
Paul
Tri-County Tv <tricountytv@xxxxxxxxxxxxx> wrote:
Jeff,
I have scoped the H.O.T collector and looks distorted , driver
transistor output is clean , If I keep turning the set on , R5A28 starts to
burn, with is off the ACL line from flyback pin# 8 . I am not sure of the
value of this resistor. It now measures about 65K. If pin 8 is the low side
of the internal HV diodes , then maybe I am dealing with a bad fly. I think
the burning of R5A28 should be clear clue as to where the problem is. I am
still working without a schematic.
Tom Berger
Tri-County TV
Robbinsville
North Carolina 28771
Ph--828-479-6043
Fax-828-479-4868
(tricountytv@xxxxxxxxxxxxx)
----- Original Message -----
From: "Shoreline Electronics"
To:
Sent: Monday, January 23, 2006 12:27 PM
Subject: [TechAssist] Re: Need VS-4544 schematic
> Can you scope the collector at startup and see if the pulse is clean or
> distorted?
>
> Keep in mind , these sets have a discrete Horizontal Output section and a
> HV
> section.
>
> ==========================
> Jeff Stielau
> Shoreline Electronics Repair
> 344 East Main Street
> Clinton,CT 06413
> 860-399-1861
> 860-664-3535 (fax)
> jstielau@xxxxxxxx
> ========================
>
> ----- Original Message -----
> From: "Tri-County Tv"
> To:
> Sent: Monday, January 23, 2006 12:18 PM
> Subject: [TechAssist] Need VS-4544 schematic
>
>
>> Hello everybody,
>> I am in desperate need for a schematic and any
>> repair tips for this old Mitsubishi Big screen. It shuts down at turn on,
>> and draws heavy current from H.O.T I suspect the flyback but it rings
>> good
>> so maybe a shorted internal high voltage diode. I have a feeling this
>> will
>> be very hard to find. I am ready to put a match to this dog! I think the
>> chassis is VZ3 Any help would be greatly appreciated.
>> Thomas Berger
>> Tri-County TV
>> Robbinsville
>> North Carolina 28771
>> Ph--828-479-6043
>> Fax-828-479-4868
>> (tricountytv@xxxxxxxxxxxxx)
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Paul ,B
Central TV&Video
911W Grand Ave
Grover Beach Ca.
(805)481-8084
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