Philips EM5E, Service Manual, Page: 35 / 136

Service Modes, Error Codes and Fault Finding EN 35 EM5E 5.
No sound at headphone
output. 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 protection). 200 V is missing on CRT
panel. 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).
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 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.
Picture is not synchro-
nised. 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 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.
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 test points B61to B64 on diagram B5.
No NextView (EPG). IC7012 defective or not pow-
ered. Check circuitry around IC7012.
No Teletext. IC7007 defective or not pow-
ered. Check circuitry around IC7007. Check also B61to B64 around µP on diagram B5.
Strange switch 'off' be-
haviour 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-resistor or connection. 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.
Phenomenon Possible Cause Repair tip