[TechAssist] Re: JVC AV35750 DEAD- Power light momentary faint click nostart
- From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 24 Mar 2003 04:32:24 +0000
I can try that but I'm doubtful C926 in this set is not the same cap as the
ones that fail, it is in a diffrent location and is a difrent value, size,
and color - the one that I tested was reading the proper capacitace out of
circuit on a BK capacitace meter. Every JVC that I've seen with C926 bad
the cap has been brown and the top of the cap has been raised and poped,
leaked etc and none of them ever tested good, Also All of the sets that I've
seen with C926 bad have been 1998 production this is 1996.
Peter Oliver
Tucson Radio TV
From: <support@xxxxxxxxxxxxxxxxxx>
Reply-To: techassist@xxxxxxxxxxxxx
To: <techassist@xxxxxxxxxxxxx>
Subject: [TechAssist] Re: JVC AV35750 DEAD- Power light momentary faint
click no start
Date: Sun, 23 Mar 2003 09:44:26 -0500
Peter....replace...don't check....C926 1000µf
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, March 22, 2003 6:20 PM
Subject: [TechAssist] Re: JVC AV35750 DEAD- Power light momentary faint
click no start
I ran down a Schematic for this beast finally and it is still a pain. It
appears that the micro is keeping the set shutdown. Pin 52 has 3.3V that is
turning on Q927 that also feeds Q542 and turns on Q926 (base has 5V) that is
keeping the volatge on PC901 at 0v pulling one pin of Q927 brings the
voltage up to 13V and the relay clicks on to other side of pc901 only goes
to 0.8V. B+ is then 147V (same at collector of HOT) but there is no HV, or
ossilaton of the Horizontal. I am tempted to order another regulator But I
am getting volatge on the otherside of the SW mode transormer which means it
is running. The voltages and waveforms aren't right but that may be a
symptom of it not running. I checked the caps in the regulator circuit and
they test ok. I am comming up at a loss for this one It isn't giving up any
usefull secrets and this circuit is too convoluted to bypass easily. Does
anywhere do depot repairs on this chassis?
Peter Oliver
Tucson Radio TV
From: <support@xxxxxxxxxxxxxxxxxx>
Reply-To: techassist@xxxxxxxxxxxxx
To: <techassist@xxxxxxxxxxxxx>
Subject: [TechAssist] Re: JVC AV35750 DEAD- Power light momentary faint
click no start
Date: Sun, 16 Mar 2003 08:50:57 -0500
Peter,
>From Tech Repair CD:
JVC\AV35750\Dead Set After Lightning\\\\Replaced Ic901(Strs5708)*
Pc901(Tlp621gb)* Q926(Dtc124eka-X)* Q922\\Remove Ce42538 antenna
splitter and resolder Q2* Q3* R1* R2* & R3\\\\\\
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, March 15, 2003 4:30 PM
Subject: [TechAssist] JVC AV35750 DEAD- Power light momentary faint click no
start
JVC
model AV35750
main chassis SGK-1023A
Year 1996
Sams 3908 (trying to locate)
Set is Dead.. Customer said went to turn on in the moring and it
would
not come on. At present if the power is depressed the LED comes on for a
moment and a faint single click is heard but there is no Degauss action, and
no attempt apparent to start. The relays have 11.8 V to them but are not
swithced on. There is standby 5V to the front panel. PC901 only has 1.1V on
the secondary side, the other opto-Isolator has 5V. The main regulator A
STRS5708 appears to be oscilating. IC101 in only has 0.5V. Checked for C926,
and tested C928, C911,C921, C534, Unsoddered Vertical IC No start,
Unsoddered HOT Collector no start, Rang FBT ok, Unsoddered Audio IC no
start. Q926 does not test well (open ?) on a ohm meter diode test in circuit
(It is a surface mount but I don't know number so I can't say if it has an
internal resistor) Unsoddered main tuner Clock and data no start. This set
does not have an SE series error amp that I can find.
Peter Oliver
Tucson Radio TV
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