[TechAssist] Re: JVC TV.. AV-36D503 chassis A108 Dead
- From: "Chuck Norton" <cen@xxxxxxxxxxxxxxxxxxxxxx>
- To: "Techassist@Freelists. Org" <techassist@xxxxxxxxxxxxx>
- Date: Sat, 7 Feb 2004 10:18:55 -0700
I had to give up on this beast for awhile. I've done some more checking,
Crystal is good and operating, +5 volts is up and running and getting to the
micro. I've checked all diodes and all of the flame proof resistors. I
looked at the modification that Bob sent but none of the parts are the same
in this set. I also noticed that someone said they had uploaded a schematic
for a similar set to the members area. I went to Tech Assist web site but
didn't find an area for things that had been uploaded. This thing has really
got me stumped. Any suggestions before I use the sledge hammer to do a
precision alignment on it?
Frequency Standards & Services
2727 E. Palmer Park, Ste. 100
Colorado Springs, CO. 80909-3032
719-228-0540 voice
719-228-9009 fax
-----Original Message-----
From: Gemini Computer & TV [mailto:geminitv@xxxxxxxxxxxxxxxx]
Sent: Wednesday, January 14, 2004 12:00 PM
To: cen@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re: [TechAssist] JVC TV.. AV-36D503 chassis A108 Dead
Here is a PDF attachment and did you see this?
>From Tech Repair CD:
JVC\AV32D200\Dead\Television will not turn on. When checking the B+ on the
CPU and EEPROM I found it was normal. At the instant that power was
applied the\Data and clock on the EEPROM was missing. Both lines stayed low
during reset* but rose to 5 volts after 3 seconds\\The Microprocessor has
normal reset normal
A.C. clock to pin 11. But the 12 MHz crystal at pin 62 & 63 is not running.
Unit has defective crystal.
Bob Waterman, CET(r) #RI-28
Master Technician License #9109
Service Manager / Parts Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxxxxxxx
geminitv@xxxxxxx
www.geminicomputertvsecurityalarms.com
----- Original Message -----
From: "Chuck Norton" <cen@xxxxxxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, January 14, 2004 10:14 AM
Subject: [TechAssist] JVC TV.. AV-36D503 chassis A108 Dead
> The set does nothing, relay doesn't even click. Traced the turn on signal
> through switch and all looks good up to IC201. I changed it with a new one
> from JVC. I never get a turn on signal from it to the power on relay
> transistor. All of the supplies seem ok. HOT is ok, flyback I haven't rung
> out yet but will probably have to do that. I can jumper the turn on relay
> and the set comes up, with raster etc. no video on screen though. This
makes
> me suspect that all the vertical and horizontal circuits are working ok
> though. That only leaves the video circuit and the tuner in this set. Any
> suggestions would be greatly appreciated!! I've been out of this business
> for about 8 years so I am rusty getting back into it. My other business
has
> slowed way down with the economy, thus, doing consumer repairs once again.
> Thanks, Chuck
>
>
> Frequency Standards & Services
> 2727 E. Palmer Park, Ste. 100
> Colorado Springs, CO. 80909-3032
> 719-228-0540 voice
> 719-228-9009 fax
>
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