Philips HTS3538/98, 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 HTS3538:XP3 on
Front Control Board and XP12 on
Main Board
No
Replace U1 on Main Board, or replace
the Main Board
No
HTS3538:Check the U301 ON Front
Control Board pin 4 5 arrive the condition
XP3 PIN10 PIN10
No
Yes
Yes
Yes
Correct connection
No
Yes
Replace U301 or LED
Check every supply voltage on Main Board
whether normal or not.
(XP1 PIN3:+12V, PIN5&PIN6: 5V)
Check v5V, +12V on Power Board
at CN502 position and Front Control Board
(HTS3538:XP12 PIN3:+12V PIN5:+5V
Check the power key(HTS3538: S608),
open/closed key(HTS3538: S611), source
key(HTS3538: S610) on Touch Board
whether work normally or not
Check Front Control Board signals
SCL,SDA
(HTS3538:XP12PIN6: SCL PIN7:SDA)
Check whether bad solder exists on
HTS3538:XP3 on Front Control Board and
LED