Philips HTS3532BL/94, Service Manual

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5-1 Trouble shooting Chart
VFD No display on Front Control Board
VFD No display on
Front Control Board
Go
Yes
Refer to CN502 on Power Board
No
Fix the connection HTS3531:XP2 on
Front Control Board and XP12 on
Main Board
No
Replace U1 on Main Board, or replace
the Main Board
No
HTS3531:Check the U135 ON Front
Control Board pin 7 8 arrive the condition
XP8 PIN7 PIN8
No
Yes
Yes
Yes
Correct connection
No
Yes
Replace U135 or VFD
Check every supply voltage on Main Board
whether normal or not.
(XP1 PIN1:-24V, PIN3: 12V, PIN5&PIN6:
5V)
Check voltage -24V, +5V, +12V on Power
Board at CN502 position and Front Control
Board (HTS3531:XP2 PIN4:-24V
PIN5:+12V PIN6:+3.3V)
Check the power key(HTS3531: S608),
open/closed key(HTS3531: K138), source
key(HTS3531: K135) on Touch Board
whether work normally or not
Check Front Control Board signals
SCL,SDA
(HTS3531:XP2 PIN8: SCL PIN7:SDA)
Check whether bad solder exists on
HTS3531:XP8 on Front Control Board and
VFD135 of VFD,