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 أعطال وصيانة تليفزيون-Repair-TV-VESTEL

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عدد المساهمات : 2369
تاريخ التسجيل : 16/06/2010
العمر : 56

مُساهمةموضوع: أعطال وصيانة تليفزيون-Repair-TV-VESTEL   الخميس يونيو 17, 2010 1:43 pm


[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذا الرابط]

Vestel ch.11AK30. Why is strongly heated line transistor.


One of the reasons, after changing the music. This is the "left"
transistors BU808DFI. Externally (to draw attention to the packing and the lot
number), they are no different from the original (see photo). Calling these
transistors in the same way as BU2508DF/DX or ST1803DHI. Ie, the transistor has
to move B-E - resistor 20oHm, and to move the K-E - a diode. The original
transistor to call very differently.

The test showed that the installation of such a transistor in a working
circuit, has been a shift to the left of the raster line - to 2-3cm. After 2-3
minutes of the transistor is heated to about 80-85 degrees. With longer life
transistor "boil" and comes with failure.

Attention! The measurements showed that after 10 minutes of work, the
temperature at the junction of the transistor with the original heat sink must
not exceed:
1) Metal Radiator - 44-48 degrees
2) Aluminium (takoyzhe area) - 40-44 degrees.

And more. Novice masters strongly recommend to pay particular attention to the
repair of the chassis for electrolytic capacitors S610/613/623/628/631/634/635/645/810/826.
These electrolytes after 3-5 years in 90% lose their properties (an increase in
ESR).


[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]


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المدير العام
المدير العام


عدد المساهمات : 2369
تاريخ التسجيل : 16/06/2010
العمر : 56

مُساهمةموضوع: رد: أعطال وصيانة تليفزيون-Repair-TV-VESTEL   الثلاثاء يوليو 12, 2011 8:00 pm




[center]Vestel ch.11AK37
TV works with all operating voltage is normal (according to the scheme). Defect
- the right side of the screen is frustrating, as it were synchronized across
the diagonal, and the rustle of the low-frequency type of ring. The reason - a
capacitor, a rectifier diode in parallel + B (145v), 470pF/2kv, as well as
"network bank". And on the bank of 310 volts as it should. ESR
according to the norm. When it vypayal and checked, then the capacity of 0.
Semiannual telly.


Vestel ch. 11AK30A11
Problem: Probit line transistor BU808DFI.
Completed projects: Replacement for BU808DFX did not get anywhere. When
you click on the panel P + for 2-5 seconds. appeared secondary stress, but it
was too low to 8B 4B. The audit showed that faulty percent. STV2246H. Leg 45
(VCC1) corotation to GND.
Since television has visited another wizard, so some denominations were tested
soldered parts (on fresh rations.) S618 was 5.6 nF 7.5 nF instead (as in the
diagram). Still had to alter memory.


Vestel chassis 11AK30A11
UHF band disappears, propayka tuner CTF 5510A Thomson did not give the result,
had to change the fact that it was - TDQ-6L/125SAA40-10007A. TV earned.


Vestel VR37TS ch.11AK-36
Fault appears within 30-40 minutes. On the bright subjects are narrowing the
size of the horizontal, at this point in the + drop from 115 to 102v, changing
the picture size restores. Power supply is assembled on m \ c, UC3843 R804
increased its rating to 7 components, is between 4 and 8 second leg m \ c,.


Vestel 21 "TFS ch.11AK30-14
Problem: when starting line-flash across the screen snake, rattle, no picture,
HOT whole. Defective quartz 4.433619. After replacing the image there, but
without the PAL and SECAM. Put this in quartz 18pF capacitance to ground, and
replaced the capacitor C427 [100n] for 1mf/50v, color went into both systems.


Vestel VR2106TS ch.11AK30-14
Problem: no start line scan, when checking the trim line scan was found swollen
capacity S619 100n/250V. After replacing it, earned the TV properly.


Vestel ch.11AK56-6
Problem: often there is no sound (sometimes appears). Wines in the condenser
S165 (26 pin processor TDA9551 (SNDPLL)).


Vestel 11AK30 chassis
Vertical strip, lit R645 - 2k2. Guilty capacitor S627 - 430n/250V

Vestel 11AK52 chassis
Do not turn on, hush BP. Guilty capacitor S847 - 4700uF/16V. Number positional
S834


Vestel 11AK30 chassis
No starting line scan, understated voltage +14 V. The reason - defective S833 -
470uF/16V


Vestel chassis 11AK19PRO
When you turn on green LED, all naprugi with PD is normal, but the heat is
trapped kin, can be in this mode as much as in my case, narrow neck tube
(China), Telly has worked 3 years warranty on the fourth tube was dead, adding
a screen Kin works have a picture and sound, the reason became clear only after
the new podkida kin breakdowns ABB and the tube was locked!


Vestel ch.11AK30-14


When the green LED and immediately goes into the guardroom. When connecting the bulbs in the B + strain but is included in the duty room hush. The reason can be seen visually S811 47n630V bloating.

[/center]
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