Trouble Shooting Chart - Philips HTS3261/12/98 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.
(XP8 PIN4:-24V, PIN5: 12V, PIN6: 3.3V)
Yes
Check voltage -24V, +5V,+12V on Power
Board at CN502 position and Front Control
Board (HTS3261:XP8
PIN5:+12V PIN6:+5V)
Yes
Check the power key(HTS3261: PAD607),
open/closed key(HTS3261: PAD603), source
key(HTS3261: PAD606) on Touch Board
whether work normally or not
Yes
Check Front
SCL,SDA
(HTS3261:XP8 PIN1: SCL PIN2:SDA)
Yes
Check whether bad solder exists on
HTS3261:XP8 on Front Control Board and
VFD135 of VFD,
Yes
Replace U135 or VFD
PIN4:-24V
Control Board signals
5-1
No
Refer to CN502 on Power Board
No
Fix the connection HTS3261:XP8 on
Front Control Board
Main Board
No
Replace U4 on Main Board, or replace
the Main Board
No
HTS3261:Check the CON607 ON Front
Control Board pin 1 2 arrive the condition
XP8 PIN1 PIN2
No
Correct connection

Trouble shooting Chart

and XP8 on