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Phenomenon
No picture, no LED.
No picture, no LED.
No picture, red LED
blinking at 3 Hz.
No picture, red LED
blinking with code 6-6-6
or 18-18-18.
No picture, red LED
blinking with code 1-1-1.
No picture, no sound.
Set is making audible
squeaking sound
No picture, no sound.
Green LED works fine
No RC-reception. Red
LED does not echo RC-
commands.
Relay (degaussing) is
not audible, when set is
switched from 'off' or
'standby' to 'on'.
No sound, only picture.
No sound at headphone
output.
Picture is rotated.
Picture is continuously
switching 'off' and 'on',
showing heavy 'switch'
spots (set does not go
into protection).
Picture is not sharp.
Picture is not
synchronised.
Picture is distorted.
Picture with horizontal
stripes.
No menu, no OSD.
No NextView (EPG).
No Teletext.
Strange switch 'off'
behaviour
Various symptoms, due
to missing local supply
voltage.
Service Modes, Error Codes and Fault Finding
Possible Cause
Standby Supply defective.
Bad connection of SSB in
SIMM-connector.
Set is in protection due to
various causes. For error
codes see error-code list.
No communication on slow
2
2
I
C- or fast I
C-bus.
No communication on NVM-
2
I
C bus to the µP.
Supply is possibly in hiccup-
mode, which is audible via a
squeaking supply transformer.
Supply does not work
correctly.
µP circuitry or RC-receiver is
defective.
µP is not working correctly.
When pin 115 is low, the
degaussing must be
activated.
Measure A7/A8 on diagram
A1. Possibly the audio
amplifier is defect (but not
shorted), or the 'sound
enable' line is high (diagram
A5). Further, measure the
audio signal path (HIP-MSP-
Switch ICs-Amplifier).
HP amplifier (7770), or the
supply to it, malfunctions.
Rotation circuitry, or related
supply to it, malfunctions.
200 V is missing on CRT
panel.
Focus is possibly mis-aligned
or SCAVEM-circuitry does not
work correctly.
The sync is derived in the HIP
from xtal 1305 and/or 1308.
Check video-path in Service
Default Mode.
Feature box processing is
malfunctioning
Probably a defective µP.
IC7012 defective or not
powered.
IC7007 defective or not
powered.
TS7445 possibly defective.
An interrupted fuse, NFR-
resistor or connection.
Repair tip
Measure circuitry (see diagram A2). Start at test-point A19.
When the Mains switch is 'on', this voltage must always be available
In case of a bad connection, it can happen that there is no picture, and that the
Standby LED is not controllable. Re-place the SSB.
You have no picture, so:
-
or you read the error buffer via ComPair
-
or you read the blinking LED information via 'diagnose'-'x'-'ok' on DST
-
or you read the error code sequence via 'diagnose'-'0'-'ok' with the DST.
When you have found the error, check the circuitry related to the supply voltage
2
and I
C-communication or the circuitry that triggers the protection.
As processor cannot communicate with one of the 2 busses it the standby-led
spontaneously starts blinking 6-6-6... or 18-18-18....
If in the error buffer somewhere is an error 6 or 18, these will have the highest
priority starting the mentioned blinking.
Measure dependent of the error on the I
2
(use I
C -overview)
As the µP cannot communicate with the NVM I
blinking 1-1-1. Note: when there is no access to the NVM, a lot of picture
setting can go wrong.
Possible causes:
-
V
is shorted (caused by short circuited line transistor 7421), or
BAT
-
Sound winding is shorted (amplifier is shortening the power supply lines),
or
-
D6514 is shorted (due to a too high V
Remove excessive load, to see what causes the failure, or check feedback
circuit. See repair tip 'Main Power Supply' (supply needs a minimal load).
If e.g. V
is only about 90 V, it is possible that the regulator IC (7506) is
BAT
defective.
In case the set does react on a local keyboard operation, you must check the
RC-receiver circuitry (diagram E).
Check RESET-circuitry on diagram B5. Check the level on pin 115 when you
switch the set 'on'. Signal must be low initially and go to high after approx. 12 s.
In ComPair, a beep test can determine where the signal stops (use
loudspeakers or headphone).
Possible cause is also the 'PROT1' protection (see diagram. A6). This is a
loudspeaker DC protection, which the µP can not sense. Via circuitry
7701/7707, this signal can put audio amplifiers 7700 and 7702 in standby mode
(tri-state input). Warning: Find out, which amplifier is causing the problem,
because it is possible, that the other one is OK.
Measure test points A64 to A67, and the supply line (+/- 16/19V) on diagram
A7.
Measure test points A52 and A53 on diagram A5.
Probably a bad connection from LSP connector 1424 to CRT connector 1224
(diagram F), or an interruption of the 200 V supply line (e.g. R3341 is
interrupted).
Re-align the 'focus' potmeter on the Line Output Transformer, or check the
SCAVEM circuitry on the CRT-panel (diagram F). It is also possible that the
DAF circuitry is defective (see diagram I). Check the Vdc values.
Maybe the crystals 1305 and/or 1308 are making a bad contact.
Investigate whether there is an error code present in the error buffer. In case
2
there is one, check the I
C-bus and/or supply lines (see overview supply lines).
Measure and check signal path Tuner-HIP-PICNIC-HOP-RGB amplifier.
In case it is a geometry issue, check opto-coupler 7482, OpAmps 7440/7450
and the Frame circuitry alignments or a possible corrupted NVM (7011).
Check functionality of PICNIC (7709), FALCONIC (7726) and/or field memories
(7714 and 7740). TS7726 and 7740 are suspected.
Measure test points B61to B64 on diagram B5.
Check circuitry around IC7012.
Check circuitry around IC7007. Check also B61to B64 around µP on diagram
B5.
Check, with a multimeter, whether transistor TS7445 is well functioning.
When no symptom or error code leads you to a specific circuitry, use the supply
lines overview (see chapter 6), for a quick scan of all supply lines.
EM3E
5.
2
C-bus which device is loading the bus.
2
C bus, it spontaneously starts
).
BAT
CL 16532044_039.eps
GB 33
140501
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