[TechAssist] Fw: Hitachi 27"TV,mod#TE67909,chas#G9LXU,No audio;Update
- From: "Don Hartigan" <hartstv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 6 Jul 2005 22:11:59 -0300
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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