[TechAssist] Hitachi 70sbx74b AP74 chassis no video
- From: Jorge Camboni <geo@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 01 Aug 2003 04:12:29 -0500
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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