Question about Akai LCT3201AD 32 in. LCD Television
When I turned on the TV (47" HCT Tv Model HLD-47FHD) this morning using the remote I heard a sound like a pop and I have no picture and my power light indicator is organe. When I normally turn on this TV the power indicator is green and when it is off the indicator is red. Do you think I have a bad fuse or power supply. Please assist. Thanks!
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Posted on Jan 02, 2017
You may have inadvertently swapped one of the caps and didn't install it in the correct polarity... Or one or more regulators are also bad... Or there may be some more and severe damage caused by the swollen (popped) cap - especially if the cap was in the 100mf range or above...
Can't really quote something like that until I was able to see and test it. However, I will charge the same as our shop rate: $29.95 plus shipping for the estimate and based on the estimate if you choose to have it repaired I'll waive the $29.95 - shipping is repaired or not.
Posted on Jul 25, 2008
SOURCE: Blinking red light
It appears in all cases that the power supply needs to be service. The blinking light might indicate that there are shorted parts or the voltage is low or a combination of both.
The solution at this point would be to get the power supply repair since new boards are not longer being manufactured. In about 95% of the time if the LCD doesn't power up or turns OFF by itself or need to be unplug for some time to make work again; those are the symptoms of a dying or defective power supply.
I service these power supplies, for more info write to firstname.lastname@example.org
Posted on Nov 27, 2008
> checked voltages meter set to AC referenced to chassis VA, VE, etc no voltages.
Do not try to measure voltages on the primary side of the power supply with a meter; you may damage the meter and cause new damage to the supply. There are switching frequencies somewhere between 50,000 - 100,000 Hz and possible voltage peaks of several hundred volts.
Checking AC is only useful before a diode bridge that converts incoming AC into raw DC that is then chopped at higher frequency into an approximate HF AC, coupled to the secondary, then tapped and connected to more diodes to produce DC, finally regulated and sent on its way.
Your plasma set uses some higher voltages that could have caused the cracking sound they heard but the DVD player didn't cause the problem directly; maybe just caused the HV for the display to surge for a moment.
You may have additional fuses on the secondary side of the supply. If test points are accessible there, check for DC voltages and be suspicious of any fuse or test point that measures nothing at all.
I can't tell you which voltages to expect since that varies from one design to another but you should find several lower voltages such as 5 VDC for logic circuits and perhaps a 12 V point. The plasma's HV could be produced from a separate board fed from the AC line or get its supply voltage from the main supply. There aren't many standards to rely on here.
The most likely semiconductor failure would be on the secondary side and diodes come in many different packages, many cylindrical, some in the TO-220 package with a metal flange and mounted on upright aluminum heatsinks. These will have only two leads and there will be some in the same package with three legs. The latter can also be checked statically but unless you know what kind of transistor or regulator (look about the same) you are measuring, you will not be able to ferret out a defective one with any luck.
While you have the set open, check for any dust bunnies that can act as sponges, collect moisture and create a discharge path for higher voltages.
Posted on Dec 27, 2008
If the power supply outputs are good! Then I would say the back light inverter is bad! If the screen stays black and does not come on.
Posted on Feb 28, 2009
Well, take the plug that goes to the inverter board out which has the 12v on it. Check the 12v again at the power supply. If 12v is low you can possibly have 2 caps bad, the values should be about 1000uf/35v or there abouts. They set close to the plug. If that doesn't work then replace the Power Supply because there are no service manuals for lcd p/s. plus nearly impossible to locate individual ic's. Try Shop Jimmy.com for the P/S.
Posted on Apr 30, 2009
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