[TechAssist] Re: Fw: Hitachi 27"TV,mod#TE67909,chas#G9LXU,No audio;Update&"FIX"
- From: "Don Hartigan" <hartstv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 7 Jul 2005 13:27:38 -0300
Tks to William Rayburn for sending me the "FIX" for this
unit.IC0401=UPC1871=MTS DECODER.Dug one out of a Goldstar chss. from my
bonepile.Tks to all others who assisted me on this unit...................
Don of HARTS-TVCR"ASC"
9 Robert St.,Oromocto,NB,Canada,E2V3N2
Tel#506-357-9785,Fax#506-357-6010
hartstv@xxxxxxxxxxx
----- Original Message -----
From: "Don Hartigan" <hartstv@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, July 06, 2005 10:11 PM
Subject: [TechAssist] Fw: Hitachi 27"TV,mod#TE67909,chas#G9LXU,No
audio;Update
> Hi Techs;This unit has me stumped;Got some good info from Alvie of
> Hitachi[see below],tks to Bob Waterman for his contact.Tryed all the tips
> Alvie sent me but I'm still going in circles.If anyone has a tip on this
> unit for no audio,I'm all ears....TIA...Regards..
> Don of HARTS-TVCR"ASC"
> 9 Robert St.,Oromocto,NB,Canada,E2V3N2
> Tel#506-357-9785,Fax#506-357-6010
> hartstv@xxxxxxxxxxx
> ----- Original Message -----
> From: "Don Hartigan" <hartstv@xxxxxxxxxxx>
> To: "Alvie Rodgers C.E.T." <rodgers@xxxxxxxxx>
> Sent: Tuesday, July 05, 2005 4:16 PM
> Subject: Re: Hitachi 27"TV,mod#TE67909,chas#G9LXU,No audio
>
>
>> Tks Alvie for your reply.Here's what I have;as per your email.DC level on
>> pin 12 of IC4101=5.65vdc.
>> Pin 19 of Micro=2.7vdc &6vpp.
>> B+on D0134=10.5VDC.
>> D0127 & C0116 CHECK OK.
>> DC LEVEL on C0116 rises & falls when adj. vol up/down tact sw's.C0136
>> checks ok.Could not find D401 & 2 on this chassis.My schematic shows them
>> across pins 4&8 of IC401=LA4270.
>> The front panel sw. is in the ON postition.
>> I still have no audio on any i/p's.I'm stumped by this simple audio
>> problem.Your assistance is greatly appreciated.Also tks to Bob for
>> getting
>> in touch with you......Regards...Don...
>> Don of HARTS-TVCR"ASC"
>> 9 Robert St.,Oromocto,NB,Canada,E2V3N2
>> Tel#506-357-9785,Fax#506-357-6010
>> hartstv@xxxxxxxxxxx
>> ----- Original Message -----
>> From: "Alvie Rodgers C.E.T." <rodgers@xxxxxxxxx>
>> To: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>; <hartstv@xxxxxxxxxxx>
>> Sent: Tuesday, July 05, 2005 10:47 AM
>> Subject: Re: Hitachi 27"TV,mod#TE67909,chas#G9LXU,No audio
>>
>>
>>> Hey Don:
>>>
>>> First, since you didn't mention this in your e-mail.
>>> On the front panel there's an Internal Speaker Switch On/Off.
>>> Make sure you're in On.
>>>
>>> Check Volume DC level to IC4101 pin 12.
>>> From the Microprocessor Pin 19 there is a PWB output.
>>> Peak to Peak level is pulled up by 12V through D0136 and D0134.
>>> Make sure B+ is present on the cathode of D0134.
>>> This PWB is smoothed by D0127 and C0116.
>>> As you adjust the Volume you should see a DC level rise on the + side
>>> of C0116.
>>> This DC voltage is routed to pin 12 of IC4101, filtered by C0136.
>>>
>>> Make sure there's no DC voltage on the anodes of either D402 and/or
>>> D401.
>>>
>>>
>>> ***************************************************
>>> Don't forget to check the Hitachi Web Site
>>> for any additional information:
>>> http://www.hitachiserviceusa.com
>>>
>>> If this information helps in any way and/or you repair the unit,
>>> please POST your findings so that all can benefit from your
>>> experience.
>>> "Let's work together".
>>>
>>> Alvie Rodgers C.E.T.
>>> Technical Writer/Trainer
>>> Hitachi Home Electronics
>>>
>>> ***************************************************
>>>
>>> ----- Original Message -----
>>> From: "Don Hartigan" <hartstv@xxxxxxxxxxx>
>>> To: <techassist@xxxxxxxxxxxxx>
>>> Sent: Tuesday, July 05, 2005 12:36 AM
>>> Subject: [TechAssist] Hitachi 27"TV,mod#TE67909,chas#G9LXU,No audio
>>>
>>>
>>> The above unit has no audio.This is on both A/V i/p's & tuner.Replaced
>>> IC401=LA4270 & AN5836=IC4101.If I inject audio on I/P pins 2 & 5 on the
>>> audio o/p IC401 my audio is OK.Got a schematic from the Hitachi website
>>> but
>>> not the exact model I wanted,so using one that 's close .This audio
>>> comes
>>> &
>>> goes to other ic's on this model.Can any Hitachi people steer me in the
>>> right direction....TIA...
>>> Don of HARTS-TVCR"ASC"
>>> 9 Robert St.,Oromocto,NB,Canada,E2V3N2
>>> Tel#506-357-9785,Fax#506-357-6010
>>> hartstv@xxxxxxxxxxx
>>>
>>>
>>>
>>>
>>>
>>
>
>
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