[TechAssist] Re: Hitachi 70sbx74b AP74 chassis no video
- From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 3 Aug 2003 09:01:53 -0400
Jorge,
Did you try Hitachi's site?
They have free manuals and tech help for anyone.
www.hitachiserviceusa.com
You need to check them out...send an email when you are in the shop and they
may even call you.
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: "Jorge Camboni" <geo@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, August 02, 2003 4:57 PM
Subject: [TechAssist] Re: Hitachi 70sbx74b AP74 chassis no video
Hello Jeff. Thanks for your reply. I wish the problem was there
but all logic functions are OK , nothing similar to OSD latchup,
I even changed and reinitialized the eeprom. I also wish it was a
PIP problem, but unfortunately it is not..I am about to give up
have a fine week-end
Jorge
At 10:52 a.m. 02/08/03 -0400, you wrote:
>Jorge,
> >From Tech Repair CD:
>HITACHI\70SBX74B\Video LOSS+Osd inop+audio inop+Fp/remote functions inop
>(except pwr)\\\\Hitachi Sb #
>PTV98-4B suspect OSD Latchup: remove micro shield\Move R157 away from
>X100* R074 & 075 change from 47k to
>15k\add 2 100pf caps on the Scl3 and Sda3 lines in surround Pwb
>from\Psu1-5&4 to -3 (gnd). check C128 s/b
>22/16. check for bad solder\\\\\
>
>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: "Jorge Camboni" <geo@xxxxxxxxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Friday, August 01, 2003 5:12 AM
>Subject: [TechAssist] Hitachi 70sbx74b AP74 chassis no video
>
>
>
>Hi fellows. Need some help on this Hitachi 70sbx74b AP74 chassis.
>At first it was a bad flyback. I changed and It came on nicely.. except for
>the video.. It has OSD but the video its almost vanished, just an extremely
>faint shadow in the background, you can guess is what remains of the
>picture. The OSD is ok, the Y sig coming to the "rainforest" IC, pin 15
>(TDA1222AN,
>no datasheet release from Toshiba) is ok, but there is nothing at the output
>Already a new (and EXPENSIVE) TDA1222AN, changed the eeprom, with no luck
>Did a lot of measurements and everything is ok, but I have no video!
>I feel psychologically tied up with this monster, don't know what to do,
>the customer
>is sad, I am becoming dissapointed; already invested in a new fly-back, no
>ideas,
>about to give up. Can not understand why a burned flyback lead to a no-video
>condition as it went bad. I am fighting 4 dogs at the same time..
>Will appreciate any help you can give me
>
>
>
>
>Jorge Camboni, GY Electronics, Richardson, TX
>
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