[TechAssist] Re: Hitachi 70sbx74b AP74 chassis no video
- From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 2 Aug 2003 10:52:49 -0400
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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