Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Troubleshooting Computer Displays
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 06-11-2019, 06:09 AM   #1
tozitom
New Member
 
Join Date: Apr 2018
City & State: Coimbra
My Country: Portugal
I'm a: Knowledge Seeker
Posts: 4
Default Philips 170S5 no power ON - PSU ok

Dear Forum, I'll need your contribution on this one... the screen doesn't power ON, also LED on control board is all OFF; so far I've been able to check PSU as OK, all the output are OK on osciloscope (12V - 5V - 3,3V). Also the 2,5V regulator (7507) on scaler board is OK, 12Mhz oscilator OK, TL431 (7444) output ref voltage is OK.
When pressing power button on control board, voltage goes from 3,3V to 0V on PIN 2 of CPU (7301) - from "K_PWR" bus. CPU as correct voltage on VCC... do I have a faulty CPU? or could you think of anything else to goes from?
Thanks to all.
Best Regards.
tozitom is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums 2003 - 2019
Powered by vBulletin ®
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 07:08 AM.
Did you find this forum helpful?