Philips HTS3582/93 Service Manual page 27

VFD No display on Front Control Board
VFD No display on
Front Control Board
Go
Check every supply voltage on Main Board
whether normal or not.
(XP1 PIN1:-24V, PIN3: 12V, PIN5&PIN6:
Yes
Check voltage -24V, +5V, +12V on Power
Board at CN502 position and Front Control
Board (HTS3582:XP2
PIN5:+12V PIN6:+3.3V)
Yes
Check the power key(HTS3582: S608),
open/closed key(HTS3582: K138), source
key(HTS3582: K135) on Touch Board
whether work normally or not
Yes
Check Front
SCL,SDA
(HTS3582:XP2 PIN8: SCL PIN7:SDA)
Yes
Yes
Check whether bad solder exists on
HTS3582:XP8 on Front Control Board and
VFD135 of VFD,
Yes
Replace U135 or VFD
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5-1
5V)
PIN4:-24V
Control Board signals
No
Refer to CN502 on Power Board
No
Fix the connection HTS3582:XP2 on
Front Control Board
Main Board
No
Replace U7 on Main Board, or replace
the Main Board
No
HTS3582:Check the U135 ON Front
Control Board pin 7 8 arrive the condition
XP8 PIN7 PIN8
No
Correct connection
Trouble shooting Chart
and XP8 on