Trouble Shooting Chart - Philips HTS5520 Service Manual

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.
(XP9 PIN1:-24V, PIN3: 3.3V, PIN4: 12V)
Yes
Check voltage
Power Board at CON503 position and Front
Control Board(XS601
PIN3:3.3V)
Yes
Check the power key(PAD607),
open/closed key(PAD603), source
key(PAD606) on Touch Board whether
work normally or not
Yes
Check Front Control Board signals CS,CLK,
Din/out
(XS601 PIN6: Din/out PIN7:CS PIN9:CLK)
Yes
Check whether bad solder exists on U601
on Front Control Board and XS601 of VFD,
Yes
Replace U601 or VFD
5-1
-24V, +3.3V,+12V on
PIN1:-24V
No
Refer to CON503 on Power Board
No
Fix the connection XS601 on Front
Control Board and
Board
No
Replace U22 on Main Board d, or
replace the Main Board
No
Check the U601 ON Front Control
Board pin 6 7,8,9 arrive the condition
XS601 6,9,7
No
Correct connection

Trouble shooting Chart

XP9 on Main