Question about Sony WEGA KV-28HX15 28" TV

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Power led flashes from red to green. tv does not

When the power switch is pressed the indicator alongside lights up green but then turns red. The CRT is heard powering up but then the power indicator turns red and then changed from red to green and back and continues about once per second.

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  • Sony Master
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This symptom, it is impossible to tell what the exact "Cause" of this symptom is. The LED's do not tell us what is wrong, sometimes it may indicate the "Area" in your case it is the X board. BUT thats NOT where the "Fault is" thats just the part that is affected. These days unlike the "Old" analogue days it just isn't realistically possible to fix anything but the most basic of problems with todays sophisticated units. This is quite apart from the Safety aspect, any unit that can cause a firs or have an explosion, or both, is NOT to be treated lightly, and and the repairer, of the unit is legally responsible, another thing to think about. Also, one must have tools, a Multimeter, a soldering iron, a deslodering iron, an oscilloscope, a signal tracer, tools, and most important of all, a Service Manual, without which, there is no way to even begin to understand and fix it, and more importantly Program it, AFTER it has been fixed. As these days a TV, is a PC, a Tuner, and an HDTV Monitor, and more, all in one. in the "old" days TV"s were more, rudimentary, and built to last for 20 years, and a "Parts" supply was set aside. They usually used to fail for only a few reasons, and they while still difficult, were less difficult to repair. Electrical knowledge was transferable, and they could be and would respond to, This-is-the-symptom-This-us-the-Fix, But that no longer applies, as now, it can be a Fault on I squared Bus, or "Sensor" failure, or it simple may have "Crashed" just like a PC, It could be a Diode go bad, and that will stop the whole thing. You see, in the day, the sets were Very "Fault Tolerant" because they were Analouge, and a faulty, component, or more sometimes, the set would always diplay something usually, and when they didn't it was one of anly a few things, sure there are always the horrid ones, and there are pleanty of those, but all in all it was quite easy. But with Digital Electronics, it either goes, or it doesnt, there are usualy few half measures. I mean thats the definition of logic either going or not. So it can take very little to completely paralyse a set, and generally give the only sysmptom, it can, by not working, usually No picture, or the like. So you, see the list is endless almost for any given SYMPTOM, as that is what is being seen, not the cause, as I keep going on about. Also any fault, usually involves the Power Supply, it is either the cause, the cause of the damage, or it is damaged. or ALL of them. Then after you have done the electronic repairs, you then must program the set to work, and align, and set up in general, any one of those settings missed or done wrong, back to square one. So, it is nearly always my professional opinion that one should always get a "Quote" form the manufacturers recommended service center, I cannot stress how important that last point is. It is even worth the cost of shipping. you see an authorised service agent, will have trained staff, trained on their brand, also they have first hand access to parts, original parts. This will actually save you money and ensure you can actually get it back fixed. Of course asking for a "Quote" also gives on the option of repair or replace. Often my clients,do not go through with repair, unless it is moderate, but in some of the more costly jobs they see it, as do i, that a replacement, with a warranty, is a better option. As an aside here, one could then tear the TV down, and sell the Known Good bits. You'd be surprised who needs parts, i myself often must by from third party sources to effect a repair. So money could be recouped, somewhat,and help out someone else.
http://www.scribd.com/doc/7581114/Sony-Chassis-AA2W-TV-Wega-Training-Manual
above is a service/training manual so you can get an idea of just whats involved, in troubleshooting and possibly repairing a set like this. http://www.eserviceinfo.com/fulltext.php?search_ft=MCZ3001D


Posted on May 08, 2010

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When i turn on my tv it tries to boot, blue mitsubishi home screen come up, i hear fan then it all shuts off while green light blinks.


Try a reset. Start by unplugging for 1 minute, then plug back in & if still won't restart try the following. If none of the following work, you will need a technician.

Initializing the TV in many cases can remedy a problem.
In the 2006 product line Initialization is now a user function.
Pressing the front panel "INPUT' and "FORMAT"
buttons at the same time activates Initialization. When
complete all user settings will have to be set again. The
table in Figure 4-3 list the User Initialization procedures.
Note: Pressing INPUT and FORMAT is the same as
the Initialization in the Option Menu (MENU-2-4-7-0)
Order Name Procedure Results Notes
1 System Reset Press <System Reset>
on Front Panel
Hardware & TV operating
software reset.
POWER/Timer LED flashes for 60
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are changed.
2 User Initialization
Press <INPUT> &
<FORMAT> on Front
Panel at the same time.
All customer Audio &
Video settings are reset to
factory default.
All customer settings will need to
re-configured.
3 Reset System
Defaults
From the remote, press
<MENU> <1-2-3>
<ENTER>
All customer settings
except V-Chip are reset to
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Netcommand, Channel Memory,
etc., will need to be re-configured.
SERVICER
PROCEDURE 4 Initialization
From the remote, press
<MENU> <2-4-7-0>*
select "INITIAL" press
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All customer settings are
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All customer settings will need to
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MITSUBISHI RESET / INITIALIZATION CHART
CUSTOMER
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Figure 4-3
Figure 4-4
LED Indications
The front panel LEDs, refer to Figure 4-4, also assist in
determining the cause of a symptom. Figure 4-5 illustrates
normal LED operation. Figure 4-6 shows the
LEDs response when a problem is detected and indicates
the possible cause.
Power/Timer
Indicator
Status
Indicator
Lamp
Indicator Condition
Off Off Off Off (standby)
Blinking green
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Off Off Blinking
green fast Lamp runs for 1 min after PTV off
Green Off Off Power On
Blinking green Off Off Power On Timer is set
NORMAL LED INDICATIONS
Power LED Status LED Lamp LED Condition
High Temperature - check ventilation air flow.
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Off Off Blinking yellow Lamp cover is open.
Lamp failure (Lamp fails to turn on)
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A blinking yellow for this model indicates the TV is too hot, unplug & allow 30-45 min to cool before re-plugging .
OR: lamp not installed or lamp door not closed. there is a lamp door switch that may not be closing, simulating door not closed


LED Indications

The front panel Status LED provides an indication of

the set's operation and the possible cause of a malfunction.

If an abnormal condition is indicated, perform the

Self Diagnostics procedure.

Self Diagnostics

To activate, press the front panel <ACTIVITY> &<CH

??> buttons at the same time and hold for 5 seconds.

The STATUS LED will then flash denoting a two digit

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• The number of flashes indicates the value of the

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• The flashing then pauses for approximately 1/2

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• The LED then flashes indicating the value of the

(ones digit) of the Error Code.

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Example: If the Error Code is "23", the LED

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times.

Table 2-2: LED Indications

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the error are listed in Table 2-3.

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condition. If the TV is switched Off, AC is

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Green Power On

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LED Indication Condition

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http://electro-medical.blogspot.com/
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http://electronicshelponline.blogspot.com/
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