Toshiba 55H70 Wont turn on but we get the blinking light of death
We looked at the schematic and found that we have 3 out of 4 Resistors
blown on the ABL circuit we get no sound and no picture just a click
that the television
is attempting to turn on. Other than that all the rest of the boards
seem to be fine with no signs of being blown. we are able to solder new
resistors in once we find them, any recommendations on where to find
1/6 watt 22k resistors. The real question though is what could have
caused this and if we possibly have a larger unknown problem that might
lead us to not make an attempt to fix.
My Toshiba TZ55X71 projection screen tv has similar problem, red light flashing, just clicks on start-up and dead thereafter. Opened rear and front cabinet sections, looks like a bunch of %^$& I cannot fix... or maybe.. please anyone help on simple troubleshooting. I have digital multimeter and basic electronics skills, just need a flowchart or something to start off with...
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Yes, it would be the problem, need to check the drive transistors next to the resistors for a short. Usually the resistors are low value like 1 ohm or 10 ohm but will need the schematic to get the exact value. You can get these parts at Encompas.com or Radio Shack.
The ABL circuit of your Sony is faulty. It is not an easy job for an unexperienced to detect this and replace the faulty component. You must have through knoledge in electroncis, effeciency to follow the schematic diagram, and must have high quality digital multimenter to follow. There is a feed back circuit compsed with one amoung Flyback Transformer pin to the main chroma IC. This circuit has some resistors and zener diode. If any of these cmponents fitted with these circuit track is faulty, the set will flash on and off repetedly. Eventhough the component to replace is not so costly, and easy to get from local electronic spare part market, locating the exact faulty component will be somewhat difficult to even an expereinced technician.
So I advice you to get this set repaired by any well experienced service technician or by the authorised service center for Sony at your town.
Loose soldering terminals at the chroma IC legs, may also be the cause of this problem. What ever it may be, just get it done by any experienced one. OK.
Its a little hard to diagnose over the computer. I assume there is no sound from the amp EVER. I assume you have tried other sources. I assume the unit worked OK until the IC blew. I assume you replaced the IC yourself?
Often, parts with the IC also fail. There maybe fuses that look just like little resistors along with the IC. They might be blown. There are parts in the circuit to test if there are speaker problems called power resistors. These will frequently open circuit when the IC Blows - you won't be able to see anything visually. If your stereo normally makes a 'Click' sound just before the sound comes on, and now there is no click, this indicates the repair of the IC is not complete yet - find the blown part.
There could be a number of reasons for this. It woyld help if you could indicate what resistors you changed. The circuit designation should be marked on the PC board. Please post those here and I'll look further and provide some possible solutions.
sounds like cold solder joint in the vertical circuit. May be schematic inside case, or look on main board for silkscreen labels, ones starting with V are for vertical circuit. look at solder side with magnifier and you will most likely fine one or more "cold" broken joints, especially where large wattage resistors or IC's with large heat sinks are attached to the main board. Just reheat them and flow new solder on them and send me 5 bucks (only kidding) should be a good fix.
you can download your schematic that will tell you resistor values and the rest of the circuits and IC indentifications as well as test procedures and more , this is a ten part zip that can be opened with winzip and read with adobe just click here http://www.eserviceinfo.com/downloadsm/12926/Hitachi_50FX30B.html
then to order resistors you can get them here http://www.nteinc.com/
or look for an electronic parts supply store around you , but alot of the time they too have to order the parts, ecspecially certain valued resistors or other special valued parts
if you need more help just ask !
my friend resistors and diodes don't just go off your circuit without a real problem. those parts gave up because of shortage on your power section, i suggest that you check your power transistros first along with the diodes and resistors.
noisy transformers... hmmmm why is that making sound? the solution there is to dip the power transformer to a thick shellac varnish let it there for let's say an hour then let it dry for a day. then place it back in your unit and see if still sounds
Did you remove one side of the resistors from circuit to check them? If you leave them in circuit a blown resistor will test good as it will read the resistance from the surrounding resistors. Usually its the 3.9 ohm resistors identified bu the bands orange,white ,gold and red. and also the 150 ohm identified by the bands brown, green, brown and gold