[TechAssist] Re: Hitachi 27CX4B A3LXU1 shutdown intmt
- From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 23 Nov 2003 11:43:42 -0500
Peter,
From Tech Repair CD:
HITACHI\27CX3B\Dead (Shut-Down P.S.)\\\A3LXU\Check +24v.(H.Osc) C716
Short\\\\\\\\
Hitachi\27CX5\shut down\Unit goes into shut down after a few minutes of
operation. Unit has to have the
power removed and restored to operate it again.\\A3LXU\A .47 mfd capacitor need
to be installed across
resistor in the shut down latch circuit.\\\\\\\\
Hitachi\31CX5B\shut down\Unit shuts down and has to have the power removed from
the set then restored.
After a hard reset the set will be restored to normal operation.\\A3LXU\C716
C623* No epoxy Q901 Q904. (be
sure transistors are installed correctly) Factory installed some of these sets
backwards. After time the
transistors begin to fail and\\\\\\\\'
Hitachi\35CX7B\shut down\Unit is shutting down. Power supply running at 156
volts R933 a 56 ohm resistor
was burned and open.\\A3LXU2\Replace C905 and R933. In addition to I901
regulator.\\\\\\\\
Hitachi\27CX30BC\When the power button is pressed the HV comes up for 2 seconds
and then goes into
shutdown\\\A3LXU\Shorted vertical IC and F601(0.75amp)\\\\\\\\
Jeff Dougherty
Intrepid Video TV/VCR
263 S Front St
Steelton PA 17113
fax...717-564-4952
www.intrepid-video.com www.tech-repair.net
----- Original Message -----
From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, November 22, 2003 7:20 PM
Subject: [TechAssist] Hitachi 27CX4B A3LXU1 shutdown intmt
Hitachi
27CX4B
Chassis A3LXU1
Chassis MFD Sept 1994
Set MFD Jan 1995
Intmt Shutdown at turn on-HV comes up then shuts down all
in about 1 sec or less there is a pronounced Hum in the power supply when
shutdown. Have changed regulator no effect. Can get to start with hair dryer
but will not reverse back to failure with freeze mist. D744 tested after set
started working tests as intact. Ideas? was thinking a connection or cap
problem but once starts working no good method to get to stop working one of
the types you think you've got it and put it together try quite a bit later
and then doesn't come on....
Peter Oliver
Tucson Radio TV
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