TV Forums

Free Games Games Forums Music Forums TV Forums

  Main Index FORUM
HOME
Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN
Rules & FAQ RULES
F.A.Q.

Crumbtrail TV Forums: TV Equipment: Projection TV Forum:
No power, No standby voltage, low relay voltage, no power light

 

 


echo26
New User

Jan 18, 2021, 4:30 PM

Post #1 of 1 (2070 views)
Shortcut
No power, No standby voltage, low relay voltage, no power light Can't Post

i have a 2007 Sony Kpf432m91, after hearing a hiss and a. Pop, the unit never turned on again. I saw a 22uf cap and replaced it, still never got a response. I am totally confused because it has like 2 main boards for the power supply including the flyback transformer. I was going on tracing the possible fault because I did some voltage checking and the primary power supply is alive. 240 on. But when I was checking a secondary board, its outputing 4.5 volts for the relay line instead of 7, and 0 stamdby voltage. I have the schematic, service manual and owners manual. Can someone give me enlightenment. i was wondering is the standby voltage should be 0 if there is no load, such that the second board (flyback) isnt connected to the main board wimhich I'm troubleshooting. Went to see if the H.out Transistor is shorted but seems not. Not shorts or voltage drop but havenít confirmed is b+ voltage is alive/overvoltage due to my hesitation. Any help would do.


 
 
 


Search for (options) - Page loaded in: 0.14 s on (CGI/1.1)