GOLDSTAR CKT 9742

Am un TV goldstar model CKT 9745 si este o problema cam ciudata si anume: comenzile sunt inversate...adica ca sa dau P+ trebuie sa apas pe P-, P+ nu ia nici o comanda, ST-BY la fel e mort...trebuie sa il sting de la butonul de alimentare, nu mai memoreaza programele...etc. Proprietarul a zis ca i-a mai facut odata chestia asta.si la dus la cineva care cu o telecomanda speciala , i-a reprogramat butoanele...adica apasa cu tel speciala pe un buton..si apoi apasa si pe telecomanda originala butonul pe care vroia sa il reprogrameze.
Procesorul este SAA1293 iar memoria este MDA 2062 iar tensiunle de alimnetare sunt de 5+...deci eu cred ca problema este din memorie ( MDA 2062 este o memorie de 1024 bit ...deci destul de mare ) si poate cineva are vre-o idee . Intrarea in service mode se face tot cu o telecomanda speciala ( asa scrie in datasheet-ul procesorului...dar nu da detalii )...dar habar nu am ce fel draq de telecomanda e aia.
Astept si eu macar o mica idee.

An entrance into the service regime for
МСН-405  can be accomplished with any state
of television set both of AV regime and from any
channel. For the entrance in the menu it is
necessary to have in the presence a panel R
with button SERV. In the absence of this button
it is possible to connect the button between
legs 15 and 23 (SAA1250) microcircuit in the panel
With the pressure on button SERV not less than
0,5 seconds on the display МСН-405  will
display CH  (CHEK) this the so-called
regime of checking television set. This regime
does not forbid usual operations for the
television set. Difference differs in the
fact that is accelerated the automatic
alliteration of commands from the panel
МСН-405  (synthesizer of stresses).
This function is very convenient with testing
of television set. It makes it possible to very
rapidly dispose television set to the channel
, and also it makes it possible to rapidly
change the adjustments: brightness, contrast,
saturation and loudness. If we press  
button SERV again, then on the display will
show OP and we will fall into regime
OPTIONS. This regime makes it possible to
produce tuning processor SAA1293 in accordance
with the possibilities of your television set
or at will of user. Advise to sketch everything
that you you will see on the display before
beginning to change tuning SAA1293. After
the entrance into regime OPTIONS it is
necessary to select the regime of switching
between the points of menu. As we wrote above
for microcircuit -02 necessary to press on button
SERV, and for -03 it is necessary to press to VOL+.
On the display it will on the turn luminesce by 4
sub-menu. In each sub-menu on 9 options (together
with the point). With the lit segment the value is
equal of 1(da) with extinguished segment 0 (no).

Note: Explanation of some options.
1.6 if television set contains acknowledgement
signal and AGREEMENTS (APCHG), then in the controller
it is possible to use two additional properties:
a) the timer of switching television set into standby
mode 5 minutes after the end of tv programs.
b ) with the approach to the station during the
tuning automatically is changed gears of tuning
with the rough to the precise, as a result of which
the user will not be able to pass station, tuning it
with the higher speed. These two properties cannot
be divided, since their work depends on stress on
the leg of 28 microprocessors. When there is a signal
, this stress is 2,8 - 12 volts, when there is no
signal - 0,8Vol't. 2.2 if is selected this option,
then all four analog adjustments with the
disconnection, from standby mode remain as with
the start. Otherwise they are normalized. 2.3
with the selection of this option band selection
occurs not immediately after the pressure of key,
but after 5 s. Or with the repeated pressure. 3.3
this option determines the version of the procedure
of memory. If option is not selected, then version
A, while if it is selected that is version v.
Version A: 1. necessary standard is selected.
2. is selected necessary range.
3. with tuning of the selected station indicator
shows range even it twinkles, APCHG is turned off
and remains turned-off. 4. key MEM makes it possible
during 5 seconds to select the desired channel
(they twinkle two segments). If the time of
selection ended, then the parameters do not
remain and indicator will show the number the
previously selected channel. The values of analog
adjustments do not remain. For their retention in
the regime MEM it is necessary to harvest key
"normalization" or any of eight analog.
Version V: Necessary standard is selected.
Necessary range is selected. With tuning
to the selected station APCHG it is switched
off and is included 1 s after the release of
the key for tuning. Necessary channel is selected.
Key MEM preserves all parameters of station and
analog values. In this version there is no
limitation of time and analog adjustments are fixed
together with the tuning. For their readout it is
necessary to harvest key "normalization". The most
frequently utilized combinations of options are
given below. I know from the experience of practice
that to begin the piercing of microcircuit the
memory in the domestic synthesizers of stress
MCH-405 is best anything with 4 oho sub-menu.
But also after the introduction of piercings
(change in the field of segments) it is necessary
to press on the button M on the front panel of
television set. Otherwise all changes in the
microcircuit of memory will remain without the
change.

Intrarea la un serviciu de modul de a MSN-405 pot fi puse în aplicare cu condiția ca toate televiziunile de la AV și
regimul de la orice canal.
. Pentru a intra în meniu, trebuie să fie disponibila telecomanda  RS-4, cu un buton Serv.
În absența acestui buton pot fi conectati pinii  15 și 23 de la circuitul integrat.
Apăsând butonul SERV nu mai puțin de 0,5 secunde pe afișaj va fi aprins MSN SN-405 (Chek) este așa-numitul regim de verificare televizoare.

Daca apăsați din nou butonul SERV, de afișare și am aprins sau executa in regim de opțiuni.

După intrarea în regim de OPȚIUNI este necesar  de a alege între după schimbarea de regim din meniu.
Așa cum am scris mai sus pentru chips-uri cu extensia -02 trebuie să faceți clic pe butonul SERV, dar la -03 trebuie să faceți clic pe vol +.
Pe display vor afișa, la rândul său, sub-meniul ecran 4.
În fiecare sub-meniu de opțiuni la 9 (împreună cu un punct).
Când  segment este de valoare  1 (da) LED-ul este aprins iar cand  segmentul este 0  LED-ul este stins (nici unul).
Cifra indică în segmentele lor de chei de pe telecomandă.

Tocmai ca nu este complicata...
Ai o telecomanda? Are circuitul intern SAA1250?