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EN 16
5.
5.8.3
Deflection
One Thin Vertical Line
Quick check:
•
Set in protection mode.
•
LED blinking with error "3".
One Thin Vertical Line
LED Blinking
Check all
connection and
peripheral at
Deflection Circuit in
place
Check
Line Transistor
7405
Is V
between
BE
200mV to 30mV & V
CB
approximately 500mV
Replace transistor
Figure 5-7 Fault finding tree "One thin vertical line"
One Thin Horizontal Line
Quick check:
•
Set in protection mode.
•
LED blinking with error "2".
One Horizontal
Thin Line
LED Blinking
Check all connection
and peripheral at
Deflection Circuit
in place
Check transistor
(7451, 7523, 7543) at
Vertical Deflection Circuitry
Check Vertical
Deflection Circuit
Figure 5-8 Fault finding tree "One thin horizontal line"
L04E AA
Service Modes, Error Codes, and Fault Finding
Check Horizontal
Deflection
Yes
Circuitry
E_14480_059.eps
170204
Replace transistor
E_14480_060.eps
170204
Blank Screen
Blank Screen
Check Vg2
Ok
(fine tune)
Not Ok
Check Beam Current Limit
(voltage is 1.8V-2V when
Not Ok
brightness and contrast is
set to the maximum
Ok
Check heater voltage
(measure pin 9&10
at the CRT socket)
Check video supply
(2457) is approximately
180V
Ok
Figure 5-9 Fault finding tree "Blank screen"
5.8.4
Source Selection
Set is not able to go into AV or any missing AV is
encountered
E.g. AV1 is available but not able to enter to AV1: Check if the
option setting is correct.
Set is able to go to AV, but no audio is heard.
1. Check that continuity of signal is there from the SCART/
Cinch input to the input of the Hercules.
2. If continuity is there and still no audio, check that option
settings are correct.
3. If logic setting is correct and still no audio, proceed to Audio
Decoder/Processor troubleshooting section.
Set is able to go into AV but no video is available:
1. Check continuity from AV input to HERCULES depending
on the input.
2. If continuity is available and yet no video, proceed to Video
Processor troubleshooting section.
5.8.5
Tuner and IF
No Picture
1. Check that the Option settings are correct.
2. If correct, check that supply voltages are there.
3. If supply voltages are present, check whether picture is
present in AV.
4. If picture is present in AV, check with the scope the Tuner
IF output signal by manual storage to a known channel.
Picture
appears?
Picture not appearing
Check deflection
circuit
Ok
Picture not appearing
Not Ok
Picture
appears?
Ok
End
E_14480_061.eps
170204
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