[TechAssist] Re: Hitachi 70sbx74b AP74 chassis no video
- From: Jorge Camboni <geo@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 02 Aug 2003 15:57:18 -0500
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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Jorge Camboni, GY Electronics, Richardson, TX
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