Service Modes, Error Codes and Fault Finding
EN 30 EM5A P/M5.
No picture, red LED blinking
with code 6-6-6 or 18-18-18.
No communication on slow
I
2
C- or fast I
2
C-bus.
As processor cannot communicate with one of the 2 busses the standby-
led spontaneously starts blinking 6-6-6... or 18-18-18.... If in the error buff-
er somewhere is an error 6 or 18, these will have the highest priority start-
ing the mentioned blinking. Measure dependent of the error on the I
2
C-
bus which device is loading the bus. (Use I
2
C -overview)
No picture, red LED blinking
with code 1-1-1.
No communication on NVM-
I
2
C bus to the µP.
As the µP cannot communicate with the NVM I
2
C bus, it spontaneously
starts blinking 1-1-1. Note: when there is no access to the NVM, a lot of
picture setting can go wrong.
No picture, no sound. Set is
making audible squeaking
sound
Supply is possibly in hiccup-
mode, which is audible via a
squeaking supply transformer.
Possible causes:
-V
BAT
is shorted (caused by short circuited line transistor 7421), or
-Sound winding is shorted (amplifier is shortening the power supply lines),
or
-D6514 is shorted (due to a too high V
BAT
). Remove excessive load, to
see what causes the failure, or check feedback circuit. See repair tip
"Main Power Supply" (supply needs a minimal load).
No picture, no sound. Green
LED works fine
Supply does not work correct-
ly.
If e.g. V
BAT
is only about 90 V, it is possible that the regulator IC (7506) is
defective.
No RC-reception. Red LED
does not echo RC-com-
mands.
µP circuitry or RC-receiver is
defective.
In case the set does react on a local keyboard operation, you must check
the RC-receiver circuitry (diagram E).
Relay (degaussing) is not au-
dible, when set is switched
from "off" or "standby" to "on".
µP is not working correct-
ly.When pin 115 is low, the de-
gaussing must be activated.
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.
No sound, only picture. Measure A7/A8 on diagram
A1. Possibly the audio amplifi-
er is defect (but not shorted),
or the "sound enable" line is
high (diagram A5). Further,
measure the audio signal path
(HIP-MSP-Switch ICs-Amplifi-
er).
In ComPair, a beep test can determine where the signal stops (use loud-
speakers 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.
No sound at headphone out-
put.
HP amplifier (7681) on dia-
gram B10, or the supply to it,
malfunctions.
Measure on pin 3 input left and pin 1 output left, repeat this for pin 3 (input
right) and pin 7 (output right), and the supply line (+8V_AUD) on diagram
B10.
Picture is rotated. Rotation circuitry on diagram
A5, or related supply to it, mal-
functions.
Measure test points A52 and A53 on diagram A5.
Picture is continuously
switching "off" and "on",
showing heavy "switch" spots
(set does not go into protec-
tion).
200 V is missing on CRT pan-
el.
Probably a bad connection from LSP connector 1424 to CRT connector
1224 (diagram F1), or an interruption of the 200 V supplies line (e.g.
R3341 on circuit F1 is interrupted).
Picture is not sharp. Focus is possibly mis-aligned
or SCAVEM-circuitry does not
work correctly.
Re-align the 'focus' potmeter on the Line Output Transformer, or check
the SCAVEM circuitry on the CRT-panel (diagram F2). It is also possible
that the DAF circuitry is defective (see diagram I). Check the Vdc values.
Picture is not synchronised. The sync is derived in the HIP
from xtal 1305 and/or 1308.
Maybe the crystals 1305 and/or 1308 are making a bad contact.
Picture is distorted. Check video-path in Service
Default Mode.
Investigate whether there is an error code present in the error buffer. In
case there is one, check the I
2
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 on diagram A4 opto-
coupler 7482, OpAmps 7440/7450 and the Frame circuitry alignments or
a possible corrupted NVM (7011) on diagram B5.
Picture with horizontal
stripes.
Pixel Plus processing is mal-
functioning
Check functionality on circuitry (B3a, B3b, and B3c) of PICNIC (7713),
FALCONIC (7718, EAGLE (7724) and/or field memories (7714, 7717,
7719, 7722 and 7723.Tip the whole Pixel Plus chipset (3 ICs + 5 Field
Memories can be diagnosed very good via ComPair.
No menu, no OSD. Probably a defective µP. Measure around microprocessor on diagram B5.
No Teletext. IC7007 defective or not pow-
ered.
Check circuitry around IC7007 and µP on diagram B5.
Strange switch "off" behav-
iour
TS7445 possibly defective. Check, with a multi-meter, whether transistor TS7445 is well functioning.
(diagram A3).
Various symptoms, due to
missing local supply voltage.
An interrupted fuse, NFR-re-
sistor or connection.
When no symptom or error code leads you to a specific circuitry, use the
supply lines overview, for a quick scan of all supply lines.
Phenomenon Possible Cause Repair tip
To Next Page
Loading...
