Rotation Circuitry; (Diagram A3) - Philips EM5.1E Service Manual

Service Modes, Error Codes, and Fault Finding
Phenomenon Possible Cause
No picture, no LED. Standby Supply defective.
No picture, no LED. Bad connection of SSB in
SIMM-connector.
No picture, LED blinking Set is in protection due to
at 3 Hz. various causes. For error
codes see error-code list.
No picture, LED blinking No communication on slow
2
with code 6-6-6 or 18- I C- or fast I
18-18.
No picture, LED blinking No communication on NVM-
2
with code 1-1-1. I C bus to the uP.
No picture, no sound. Supply is possibly in hiccup-
Set is making audible mode, which is audible via a
squeaking sound squeaking supply transformer.
No picture, no sound. Supply does not work
Power LED works fine correctly.
No RC-reception. LED uP circuitry or RC-receiver is
does not echo RC- defective.
commands.
Relay (degaussing) is uP is not working correctly.
not audible, when set is When pin 115 is low, the
switched from 'off' or degaussing must be
'standby' to 'on'. activated.
Picture is rotated. Rotation circuitry on diagram
A5, or related supply to it,
malfunctions.
Picture is continuously 200 V is missing on CRT
switching 'off' and 'on', panel.
showing heavy 'switch'
spots (set does not go
into protection).
Picture is not sharp. Focus is possibly mis-aligned
or SCAVEM-circuitry does not
work correctly.
Picture is not The sync is derived in the HIP
synchronised. from x-tal 1305 and/or 1308.
Picture is distorted. Check video-path in Service
Default Mode.
Picture with horizontal Pixel Plus processing is
stripes. malfunctioning
No menu, no OSD. Probably a defective uP.
No NexTView (EPG). IC7012 defective or not
powered.
No Teletext. IC7007 defective or not
powered.
Strange switch 'off' TS7445 possibly defective.
behaviour
Various symptoms, due An interrupted fuse, NFR-
to missing local supply resistor or connection.
voltage.
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:
-
Read the error buffer via ComPair (error buffer is accessible when set is in
protection, compare-file will guide you to this)
-
Read the blinking LED information via standard remote command
<mute>06250X<ok>
-
Or you read the error code sequence via standard remote command
<mute>062500<ok>.
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
2
C-bus. 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 uP 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
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.
Measure test points on diagram A5.
Probably a bad connection from LSP connector 1424 to CRT connector 1424
(diagram F1), or an interruption of the 200 V supply line (e.g. R3341 on circuit
F1 is interrupted).
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.
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
there is one, check the I
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.
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.
Measure test points B61to B64 on diagram B5.
Check circuitry around IC7012 on diagram B5.
Check circuitry around IC7007 on diagram B5. Check also B61to B64 around
uP on diagram B5.
Check, with a multi-meter, whether transistor TS7445 is well functioning.

(diagram A3).

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.
Figure 5-5 Repair tips
EM5.1E
2
C-bus which device is loading the bus.
BAT
is only about 90 V, it is possible that the regulator IC (7506) is
2
C -bus and/or supply lines (see overview supply lines).
5. EN 31
2
C bus, it spontaneously starts
).
CL 36532017_047.eps
240403