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Track: ODHoo6pa3HbIu My3oH
Wu: Macros
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This FAQ (Friendly Question Answers)
designed to help non-professionals with
repairing various types of household appliances.
General faults.
1) Defect: color spots appeared on
corners of the screen in the image.
Reason: an accident may have occurred
magnetization of the kinescope mask.
Defect elimination: make sure that the
with the TV there are no objects that create
magnetic field (magnets, acoustics)
Turn off the power to the TV by unplugging the plug from
sockets
After half an hour, turn it on. If
spotsdisappeared - do it
the above operation every time
a similar problem will arise.
If the defect has not disappeared, you need to look at
posistop, black box with three or
two terminals (sometimes it looks like
high-voltage capacity - only two
terminal) next to the mains fuse
and to the demagnetization loop - connected to
posistor. At the loop terminals
demagnetization when turning on the device
into the network, damped ones should be generated
pulses with a frequency of 50 hertz, attenuated during
time to zero. Decay time
approximately 5 sec.Posistor in this case
warms up to a temperature of 60-80
degrees. Sometimes, usually in expensive ones
TV models, mains voltage to
the posistor can be supplied through a relay.
If the degaussing system is working
normal, then probably there was a displacement
Kinescope masks are definitely a replacement
kinescope.
2) Approximate, brief orientation
blocks, depending on the nature
malfunctions.
Does not turn on, standby light
does not light -
Power supply unitmanagement
TV.
Does not turn on from standby mode
(standby light is on) -
Power supply, line scan (sometimes
plus a radio channel diagram - for telephones. where
m/s radio channel serves and m/s sweeps)
No image, but there is sound -
Power supply, line scan, block
control, video signal processing unit
(chroma)
No sound, there is an image -
Power supply, sound processing unit.
Specific TV models.
Samsung, whose power supplies are built with
using SMRCHO200 microcircuits,
HIS0169.
The power supply is easily defective, I will say
only that sometimes HIS0169 remains intact.
The main thing is to remember to look at
high-voltage zener diode R2K. It costs
on the secondary circuit 120 volts.As a rule, R2K burns out in a short circuit. If you
replace m/s in the power supply, but leave
burnt zener diode, in 9 cases out of 10,
you will have to change SMR and HIS again.
Since HIS0169 is
microassembly, that is, the possibility of it
restore. But this will be dedicated
separate article.
Samsung, whose horizontal scan
noctopoeha using TDKS with
brand 14A001,20A001.
A common defect in these devices is the long
warming up, or the image darkens/lightens
over time.
Cause of defect in TDKS.Direct
To my knowledge, there is no analogue. There is
indirect analogue, it requires small
alterations in the board (re-routing
conclusions).
AKAI,2107,2007,1407
Defect: does not turn on from standby
mode. There is sound, but no picture.
Reason: increasing output voltages
network blocknutrition, which leads to
failure of lowercase elements
sweep.
Remedy: MUST be replaced
capacity 47.0 µF in the power supply on
capacity is not less than 47.Ω/50V.
Next, a zener diode at 12
volt-located around the radiator
personnel m/s.
Sometimes diode and safety
resistor (FUSE RESISTOR) along the power circuit
12 volts.
Possible failure of the lowercase
transistor.
Defect: turns off after 15-60 minutes
after switching on, not adjustable
sound volume, forgets programs.
Reason: block microprocessor
TV control (IC-MCU)
Remedy: replacing the IC-MCU. Can stand
one of three microcircuits
С68224Y,С68230Y,С68241Y.
S68230 and S68241 are direct analogues of each other
friend.С68224 changes to others and
back with somemodifications. The list of modifications is usually
supplied by sellers
components.
ATTENTION after replacing the IC-MCU it is possible
the sound volume will be very
big, hold down the decrease button
volume until it becomes
normal.Volume level indicator
it can run several times
around the ring.
RECOR, our beloved, aka SAMSON,NAIKO.
Defect:does not turn on
Reason: loss of capacity value in
power supply - a consequence of the increase
output voltages in the power supply,
Power supply failure.
Remedy: replacement of the container is MANDATORY
47.ΩF in the power supply of a powerful
transistor (usually BUT11AF) per capacitance
the same denomination, but with a larger denomination
tension.
Next check BUT11AF, transistors
near it, a resistor fromemitter BUT11AF
to ground, resistor 3.9 Ohm, 5Bt. Possibly
12 volt zener diode failure
in the power supply.
Defect: does not turn on from standby
mode.
Reason: similar to the previous one
question.
Remedy: Replacement of the container is MANDATORY
47.ΩF in the power supply of a powerful
transistor (usually BUT11AF) per capacitance
the same denomination, but higher nominal
tension.
Check power supply circuits
horizontal scan trigger-transistor
S8053 (S8050) and 12 volt zener diode.
Located between the ULF radiator and
radio channel screen. With a working circuit
on the 11th leg of m/s radio channel TDA 8305 in
in standby mode the voltage should be 9
volt
Next is a line transistor and resistor 10
Ohm/1W in its collector circuit.
Defect: narrow horizontal stripe on
screen, there is sound. Reason: same as the previous two
points.
Remedy: Replacement of the container is MANDATORY
47.ΩF in the power supply of a powerful
transistor (usually BUT11AF) per capacitance
the same denomination, but nominal
tension.
Failure of m/s frame scanning
TDA3653 - change it. Occasionally the containers around
her.
FUNAI, 21OOmk7,20OOmk7
Defect:does not turn on.
Reason: the power supply is faulty.
Elimination: due to leaks
transistor BFb98, there is an overestimation
output voltages from the power supply, which
entails failure
high voltage zener diode R2M and
fuse type ICP along the power circuit
processor.
Change the transistor, even if not
causes criticism, preferably an analogue one
more powerful.Replace R2M and ICP fuse according to
processor power circuits.
Defect: Turns off after 20-40 minutes
viewing, volume cannot be adjusted
sound, not controlled by remote control, on
screen instead of number indication
channel - "krakozyabry"
Reason: Control processor (IC-MCU)
Remedy:replacement of the processor.
AIWA, models 2000,2002,1400.1402
Defect: does not turn on, stripes across the screen,
turns off, narrow vertical stripe
on the screen.
Reason: bad solders in the processing unit
signal.
Remedy: unsolder the vertical
board (digital processing
signal), Carefully solder all soldering on
on both sides.everything back and
turn on.
Occasionally there is a malfunctioning
personnel chip.
Sometimes there were cases of failure
color signal processors,
It’s better not to take risks here. If soldering
did not help, take it to the service center, because...
processors are not cheap - from 9 DM to 30 USD. and
better not to risk being wrong
defects.
AIWA, models TV-A215,205,145.
Defect:does not turn on.
Reason: power supply failure.
Elimination: defect is easy, since in
BP all dead parts usually burn out
to the ground. The original reason is the bourgeoisie
place the container at the junction
the primary/secondary part is only 1nF, 1kV.
This is not enough voltage - you need to set
1nF,1.6kB.
SONY 1400
Defect: will not turn on from standby
mode.
Reason: secondary circuits are faulty
power supply, perhaps also lowercase
sweep.
Elimination: along the 100 volt circuit that goes
to the collector of a line transistor - how
the ICP rule fails there
fuse, look at
possibility of breakdown of the line transistor.
SONY KV-M2540
Defect: does not turn on from standby
mode, not controlled from the remote control.
With nporpebom stripes appear on
screen, sound crackles and turns off,
reaction to "npoctyk".
Reason: violation of rations (their aging) in
tuner.
Remedy: solder thoroughly and
neat tuner, especiallypart
around m/s TSA5512.
Near the system processor on the board
(CXA***) solder resistor matrices.
Sometimes RAM failure is possible
24С04.
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