[TechAssist] Re: Need VS-4544 schematic

Mitsubishi offers an internet tech tips/support website accessible for an 
annual fee of $125.00($100.00 for renewal).
Use it 2-3 times a year,and it's paid for itself.... email Peggy Bray...... 
pbray@xxxxxxxx
Here's some tips from it for your model.
Shutdown at power on.......
1. SHORT DETECT SHUT DOWN (PIN 15 OF IC700) CHECK FOR OPEN L902 PART # 
351P070010 OFF Q904 C (15 V SUPPLY) ON THE MAIN PCB. 2. SHORT DETECT 
SHUTDOWN (PIN 15 OF IC700) CHECK FOR SHORTED D913 PART # 264P722010 AND 
OPEN Z901 PART # 283P039020 (Z905 AND Z900 MAY ALSO BE OPEN BECAUSE OF 
THIS). 3. X-RAY SHUTDOWN (PIN 55 OF IC700) CHECK FOR A LEAKY D5A09 PART # 
264P244030 OFF PIN 6 OF IC5A01. 4. X-RAY SHUTDOWN (PIN 55 OF IC700) CHECK 
FOR LEAKY D5A21, PART # 264P045040, IN THE BEAM PROTECTION CIRCUIT ON THE 
MAIN PCB. 5. CHECK FOR LEAKY Q5A03 AND/OR Q5A04 BOTH PART # 260P559050, IN 
THE HIGH VOLTAGE DETECT CIRCUIT, ON THE MAIN PCB.
1. SHORT DETECT SHUT DOWN (PIN 15 OF IC700) CHECK FOR OPEN L902 PART # 
351P070010 OFF Q904 C (15 V SUPPLY) ON THE MAIN PCB. 2. CHECK FOR LEAKEY 
D5A21, PART # 264P045040, IN THE BEAM PROTECTION CIRCUIT ON THE MAIN PCB 3. 
CHECK D5A09, PART # 264P244030 OFF OF PIN 6 OF IC5A01 ON THE MAIN PCB

1. CHECK FOR LEAKEY D5A21, PART # 264P045040, IN THE BEAM PROTECTION 
CIRCUIT ON THE MAIN PCB 2. CHECK PIN 6 OFF IC5A01 FOR 22.2 VOLTS DC IF LOW 
CHECK D5A09, PART # 264P244030 ON THE MAIN PCB.

Peggs

At 04:46 AM 1/24/06, Damon wrote:
>R5a28's value may depend on the set itself....look at the parts list for
>variations, if not there look at the LEGEND normally found on the specific
>page OR the First page of the schematics. The legend will show how the
>schematic's markings are used (ie 56 = 56pf and 5.6 = 5.6 uf)
>They normally put notes about unknown values in there for a reason.
>
>Damon B
>Telrad Electronics
>Fort Wayne IN
>----- Original Message -----
>From: "Paul" <dntwntv@xxxxxxxxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Monday, January 23, 2006 9:21 PM
>Subject: [TechAssist] Re: Need VS-4544 schematic
>
>
> > 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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