[TechAssist] Re: {Spam?} Re: Panasonic D552 (RH3F) SHORTED - Which Sub?
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 13 Jan 2004 17:03:48 -0500
Bil, sorry I didn't realize the original was rated at 1500V.
I'm guessing that the damper must have leaked, causing the HOT to get
un-dampered pulses thus shorting it out.
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
Bil Green wrote:
>
> Hi Gary,
>
> The original diode is rated at 1500V and supposedly a rectifier cannot
> be used as a damper. I do have the one you recommend (great
> replacement for almost any larger diode). This is included in my Super
> Easy Diode Subbing. I obviously will have to order the original.
>
> But what caused the diode and HOT to fail together?
>
> Thanks much
>
> --
> Best regards,
>
> Bil Green
> 2001 TV VCR
> Mammoth Lakes, CA 93546
> 760-934-2001 mailto:tv.vcrrepair@xxxxxxxxxxx
>
> Tuesday, January 13, 2004, 1:06:26 PM, you wrote:
>
> GM> Try a MUR4100E. This diode is rated 1000V, 4 Amp, 75 nS
>
> GM> Gary McCartney
>
> GM> McCartney Electronics
> GM> Guelph Ontario Canada
> GM> Est. 1984
> GM> email: gary (at) number63.ca
>
> GM> Keith Trumbla wrote:
> >>
> >> Bill is right, for some reason you can't sub that diode. I tried a few
> >> different 5amp 1000V fast diodes and they all ran hot.
> >> Keith Trumbla
> >> BEMelectronics.com
> >> Suite 212-530 Century St.
> >> Winnipeg Canada
> >> R3H 0Y4
> >> Ph.204.775.2875 Fax.204.774-9192
> >> ----- Original Message -----
> >> From: <gulftech@xxxxxxxx>
> >> To: <techassist@xxxxxxxxxxxxx>
> >> Sent: Tuesday, January 13, 2004 1:41 PM
> >> Subject: {Spam?} [TechAssist] Re: Panasonic D552 (RH3F) SHORTED - Which
> >> Sub?
> >>
> >> > Bill,
> >> >
> >> > I know of no substitude for that diode. See the post below on a similar
> >> > set for some things to check.
> >> >
> >> >
> >> >
> >> > Ken Smith
> >> > Gulf Technical Services
> >> > 3034 Gulf Breeze Parkway
> >> > Gulf Breeze, FL 32563
> >> > 850-934-8324 (Voice) 850-932-0819 (Fax)
> >> >
> >> > ------------------------Post copied from
> >> > 10/25/2003----------------------------
> >> >
> >> > Philip:
> >> > Your problem is probably in the pincushion circuit.
> >> > Check Q752 , 753 and 754 for shorts.
> >> > Also check L751.
> >> >
> >> > Quoting Philip Bader <tjanphyl@xxxxxxxxxxxxxxx>:
> >> >
> >> > > Dead. HOT shorted. Removed HOT Q551 (D1556), powered up with about
> >> > > +140VDC at collector trace.
> >> > > Also found shorted D552 (# RH3F loc.in fly area) and associated 10
> >> > > ohm/2W resistor R764 open.
> >> > > Replaced diode,HOT, resistor.
> >> > > To eliminate possibility of shorted CRT, I unplugged CRT board, and
> >> > > removed anode wire which I inserted in a glass along with my HV probe.
> >> > > Powered it on, with a burst of about 25KV anode voltage then shut off
> >> > > again.Just a click now. D552 shorted again. I do not have an OEM diode
> >> > > but used some heavy ,fast, 1 KV subs.D552 should be rated at about
> >> > 1500V
> >> > > @2.5A according to web. Twice it shorted.
> >> > > D552 goes directly to yoke. I rand yoke H windings: good. My HOT is
> >> > > still OK.
> >> > > Need input here.
> >> > > Phil Bader
> >> > > --
> >> > > 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
> >> > >
> >> >
> >> > On Tue, 13 Jan 2004 10:32:10 -0800 Bil Green <tv.vcrrepair@xxxxxxxxxxx>
> >> > writes:
> >> > > Panasonic CT27SF22T1
> >> > > 1995 27" TV
> >> > >
> >> > > Q551 (2SD1556 HOT) shorted
> >> > > D552 (RH3F - Damper??) shorted
> >> > >
> >> > > Are there often other parts involved with this type of failure in
> >> > > this
> >> > > chassis?
> >> > >
> >> > > I rarely see a damper(?) shorted when the HOT fails
> >> > >
> >> > > Thanks
> >> > >
> >> > >
> >> > >
> >> > > --
> >> > > Best regards,
> >> > >
> >> > > Bil Green
> >> > > 2001 TV VCR
> >> > > Mammoth Lakes, CA 93546
> >> > > 760-934-2001
> >> > > mailto:tv.vcrrepair@xxxxxxxxxxx
> >> > >
> >> > >
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