Philips EM5E AA Service Manual page 35

Service Modes, Error Codes and Fault Finding
Phenomenon Possible Cause
No sound at headphone HP amplifier (7681) on dia-
output. gram B10, or the supply to it,
malfunctions.
Picture is rotated. Rotation circuitry on diagram
A5, or related supply to it, mal-
functions.
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 synchro- The sync is derived in the HIP
nised. from xtal 1305 and/or 1308.
Picture is distorted. Check video-path in Service
Default Mode.
Picture with horizontal Pixel Plus processing is mal-
stripes. functioning
No menu, no OSD. Probably a defective µP.
No NextView (EPG). IC7012 defective or not pow-
ered.
No Teletext. IC7007 defective or not pow-
ered.
Strange switch 'off' be- TS7445 possibly defective.
haviour
Various symptoms, due An interrupted fuse,
to missing local supply NFR-resistor or connection.
voltage.
Repair tip
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.
Measure test points A52 and A53 on diagram A5.
Probably a bad connection from LSP connector 1424 to CRT connector 1224 (dia-
gram F1), or an interruption of the 200 V supplies line (e.g. R3341 on circuit F1 is
interrupted).
Re-align the 'focus' potmeter on the Line Output Transformer, or check the SCAV-
EM 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
2
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 geom-
etry 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.
Check circuitry around IC7007. Check also B61to B64 around µP 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.
EM5E 5. EN 35