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I am not having the exact circuit diagram of AMU22 (AKAI) to find out the proper defect of the components for necessary repairings. Please let me know where to find the same. Thanking you.

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If you search for the Akai AM-U22 Service manual, you will have the schamatics. The Service manual will cover the AM-U11 and the AM-U22 with the matching tuners that go with them. AM-U22 is at the back.

Posted on Feb 02, 2015


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What's the most likely problem with my 50" LG 50LN5100 LED LCD TV. The standby light illuminates when plugged-in but the screen doesn't come on nor is there any sound when the TV is turned on.

Thunderstorm over the coax or /and the power supply measure the power supply by a defect cannot be measured anymore over an analog hand adjustable power Variac transformer from 0 to 240 volt. because a protection can be given by a defect t-con board (as suggestion) but the variac its good to bypass/ overhaul the build-in safety protection circuit inside the power supply board then sometime if there else are broken or bad components hard to find they can be sometimes intentional burning out or become warmer by twist the variac power slowly up from of zero volt until the max necessary voltage T-con boards that can have a problem with smd components sometimes they can burning out the defects but its only to do if there is no equipment to measure repair or nothing was to find without a service manual or other optical defects , an short-circuit tuner also by thunderstorm sometimes only the little ceramic capacitors what hangs to earth (chassis) if the thunder energy was coming over the antenna coax cable. the power supply can stand in a safe protection mode. then a refurbished board somewhere can be necessary that will give a reset to release the protection mode in the power supply.. Thunderstorm can be strange and much different and i have had 2 times repairing when there was only 1 ceramic short-circuit ceramic capacitor to find thats was with one leg is( on cold-earth) on the chassis. as the one and only defect component. A time in a TV and 1 time in a radio , sometimes its realy strange but comes it over the power supply its hard to find because of more recurring complaints if partial repair in smd circuits. hard to do without necessary tools.

Jul 26, 2017 | LG Televison & Video

1 Answer

Akai PDP4294 has pic, but no sound.

Check the speaker/s first. If found OK; check and replace the damaged component/s at its audio output section circuit board. If needy, replace this board as card basis. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box.

May 20, 2014 | Akai Televison & Video

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Was watching tv and just went completely quiet no sound at all? dont even know where to start looking......just had to put new lamp in it not even a week ago.......what is wrong with it?

Sorry to say the AC cord is causing the problem. Heat is the enemy of electronics, and these sets operate hot. You might wish to unplug the TV for an hour or more. If this power reset does not allow the TV to turn on with sound and continue to operate component failure is indicated. These sets are assembled using the wave soldering process they are known for having cold solder connections. This model of TV has over 3,000 parts which include millions of transistors inside the integrated circuits. I suspect a problem with the audio circuit. The capacitors will change value, leak and become defective. Resistors will change value and burn. Integrated circuits and transistors can go bad. This can cause other components to become defective, which can have a domino effect and cause other parts to fail. Replacing one defective part may make the TV operate for a short time but the part will fail again since if the parts that caused the failure to begin with are not replaced. The only way to know for sure what is causing the problem, which parts that are no longer within factory specs and for proper repair all the electronics must be diagnosed by someone with the correct electronic test equipment and the skills to use the test equipment. I wish I could tell you there was a quick fix or button to push that would fix the TV but that is not the case or the solution needed to get the TV operating correctly.

Feb 13, 2011 | Akai PT61DL34 Television

1 Answer

Fuse #109 keep blowing/ driver seat not working please help

If the fuse keeps blowing, I assume it is because you keep replacing it. Those fuses have given up their lives to keep your truck from burning to the ground. Each time a fuse blows, the wires in the system get heated up and weakened. If you keep replacing the fuse, the insulation will eventually burn off of the wires and light the entire truck up. There is a shorted component or wire on one of the circuits that are protected by that fuse. Replacing the fuse without locating and repairing the reason that it blew, will only result in another fuse having to give up its life to keep your truck from roasting and all the other fuses will have died in vain.
The circuits to that fuse will need to be traced, using the wiring diagrams for your vehicle and the proper equipment necessary for performing tests on your electrical system. Nobody online can tell you what the actual cause of the problem is (other than tell you there is a short) without performing the necessary tests on the vehicle itself.

Jan 29, 2011 | 2006 Ford F-150

2 Answers

My projection tv has sound but no picture?

The HV and HOT have failed. This is a very common failure for rptv sets. The HV is derived from the Horizontal Output Transistor and is distributed sequentially to the three projection tubes; there is much power and energy going on when it is working properly; when it fails you will know it in many ways not unlike exactly what you have witnessed. The repairs will be over $200 but should be less than $400; all depends on the exact components (there are over 200 of them in the two circuits mentioned) that are defective. You will need a tv tech to make the repairs. First it will be necessary to determine exactly which components have failed and why; then they must be procured and replaced. Not a trivial matter; but that is what us tv techs do.

Best Regards,
Beach TV Repair

Jul 04, 2010 | Philips 60P8341 60" Rear Projection...

1 Answer

Power Supply Buzz

Did you use the same as original replacement capacitors? I have repaired many of these power supplies for others and never had an issue. It is possible that the failing capacitors could have caused more damage to the power supply but I have never seen it in over 50 repaired AKAI power supplies. Also, make sure you replaced the capacitors with the proper polarity.

Nov 08, 2008 | Akai LCT2715 27 in. LCD Television

2 Answers

Akai LCT3701AD refuses to leave STANDBY mode.

The power supply on your LCD is defective. It does not provide the power needed to all the circuitry due to defective capacitors or other components.
You will need to replace the power supply or get it repair because these service parts are not longer being manufactured.
Good Luck.

Sep 19, 2008 | Akai LCT3701AD 37 in. LCD Television

1 Answer

Power Shuts off after 30-45 minutes

I will say that the part that you bought could have been removed from another LCD and it might not be working properly due to components that become defective when they overheat.
It looks like there are not service parts or they are difficult to find.
Most power supplies I've repaired have components that failed after about 1500 hours of use.
The only way to get the LCD working is to repair the power supply to the component level instead of swapping it.
In about 95% of the time the power board is defective.
Let me know if you need further assistance.

Aug 16, 2008 | Akai LCT3201AD 32 in. LCD Television

2 Answers

Black vertical line

The drive module for the screen, or the screen itself has to be replaced. Either being defective can cause your described fault condition. The service tech would find the defective board by swapping them with new ones.

These parts are expensive.

There is no supported component level service on the circuit boards. They use complex SMD technology, and it would be impossible to troubleshoot these boards as like was done in the older days in equipment that used standard type components.

One way to fix your set, is to find another defective set of the exact same model, and swap out the required parts from it. The problem here is that there is a good chance that the same parts are defective in the other set. In this case, you would still be left with the same problem and have spent good money to buy another defective set.

If it was possible to have your TV set built with standard type discrete components, the electronics would be many thousands of times their size, and the cost would be unaffordable.

Jerry G.

Jul 11, 2008 | Akai PDP-4247 Television

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