Philips 286NS-05, Service Manual

Page: 26 / 39

6 Overview oscillograms
11 Comet
220v~
D6420 D6422 C2426
A1
Pump
Charge
1101
+150
+14D
+160D
+14Db
+8V
+14Dc +8Va
9108
+9S
+5S
+5Sa
9610
9700
9704
+8Sb
+5Sc
+5Sb
ON/OFF Func.Switc h
A4
Control
+TXT
A4
+5Sa
+9s
9420
9616
V- Vari
A4
+14D
+12v
+8Vd
+8V
+8Va
3012
+14Da
LOT
A1
1502
7420
Sync Horz. Vert.
A1
IR-LED Receiver
A4
TS7505
A1
Power Supply
A1
D6107
A2
!
!
!
!
!
!
CRT
Panel
B1
9001
9101
+14D
AM/FM Selection
A3
"Y"+ Source sel.
7100-6b
A2
IF-Det.
7700-6a
A2
Sync
7100-6a
A1
Secam
Det. 7106
A3
Delay
7107
A3
AM Sound
A3
Beam Info
B
Switch
L/L'
or BG/DK
A3
Band- switch
Tuner Band
switch
Tuner
A2
0 - 33v
Audio Sound 7700
A3
7422
+14D
+25 KV
A
TTENTION
!
"N
OT
MAINS
ISOLATED
"
SYNC
7100-6e
A1
T7423
A1
9617
+8Vd
8Vf
8Va
9124
+8Va
1503
TS 7500
A1
POR
150
Deflec- tion Module
D
P.O.R.
A4
Sync 7100-6e
A1
+14 Lot
R3438
THT
7422
If replace def. comp. do, "First check after repair"
S
WITCH
ON
THE
SET
(with the mains switch
or Remote Control)
No Picture
No Sound
Is
V150
=>150Vdc ?
Disconnect L5423 and
m150 again
Measure voltage
"P1" on C2516
Is
Voltage C2516
=>300Vdc?
Check: Ts7103, Ts7420,
Ts7421
Reconnect L5423
V150a
=>150Vdc ?
Yes
No
Signal "L4"
= OK ?
Signal on
pin 1of LOT
= OK ?
Signal "L5"
= OK ?
Yes
No
Check:
Supp.+9S
Fuse 1502
D6503 Ic7100
Switch "ON"
Service-default
alignment mode
Blinks
"One time"
Blinks
"Two times"
Blinks
"Three times"
µ
p
Error
Check
:
Ic 7600
I
2
C BUS
Error or blocked
Eeprom
Error
Check:
IC7605
LED
Blinks "N" times
Yes
Yes
Yes
No
No
No
No
Yes
No Sound
Picture = OK
Check
Voltage:
+8Sb o
n
Pin1 Ic7700,
R3523 (3,3ohm)
Controlvoltage on
Pin4 Ic7700,
Signal on:
Pin6 Ic7100,
Pin50 Ic7100,
IC7700
No Picture
Sound = OK
Check:
Voltage:
+14D, VG2
+8Va, Ic7107
Signal on:
P21 Ic7100 P30 Ic7100 P31 Ic7100 P7 Ic7100
T7906,
D6906
Check:
Voltage:
+8A,
Signal on:
p36 Ic7600 p35 Ic7100 p5 Ic7100
Check:
3928
Plug 0041
Line
deflection
coil
Check
Voltage:
+150V
-Ic7100
Check:
on 110 PCB
Voltage:
T7902
T7903
Plug 0040
Signal on:
P43
IC7100
D5
White
No
Coulor
"First check after repair"
Check:
D6424
Check:
Fuse
1501,
D6506, D6514, Ts7504
R3514,
R3515
Check:
D6502,
D6510
Ts7504
Connect TV set to a variable
mainstransformer.
Connect scoop to Ts7504
Adjust mains-voltage to 40V~
Increase mains-voltage
to 82 - 85V~
Check: D6502,
Ts7501,
Ts7502
"SOPS" supply is OK!
Voltage on
C2515 >100Vdc?
The FET 7504
is switching?
No
No
Yes
Yes
Check: D6501, Ts7502