Question about Denon AVR-1601 Receiver

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Shuts down mine does the shut down after a couple seconds, I did replace two 1 ohm resistors that were bad, you say check the capacitors? any advice on how? also it did have the humming noise the last time it actually powered up. thanks for any help. Jesse

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Jesse,
Best to replace all four 1 ohm resistors...............
Cap checks done with ESR meter ........can be purchased
for about $150.00.... www.eds-inc.com .....EDS-88 CapAnalyzer
.......................T.

Posted on Mar 27, 2008

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When playing a radio station, it will shut down after only about 20 seconds and then restart and then shut down, repeatedly. Any clues???


Yes, I have a clue. Most likely it is a bad solder joint near a chip. Could be at a supporting device like a resistor or capacitor. It heats up and looses contact. Replace it if is a cheap or factory radio.

Jul 28, 2015 | Cars & Trucks

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Anyone know how to fix a Panasonic Viera 50" Plasma that powers off a couple seconds after powering on?


tThe diagnostic circuits is shutting your TV down. In most cases the set will shut it down immediately. Apparently your set hasn't shut completely down yet. When you turn your TV on the diagnostic circuits send a low voltage, low frequency signal through all the circuits and depending on how they come back whether the sets powers up to full power. If a problem is detected it will shut down to protect the other circuits. It sounds like you might have some capacitors going bad on your power board. A capacitor that is going bad would let it come on for a few seconds then the diagnostic circuits would see the capacitor getting further out of tolerance and shut the set down. If you are a DYS type person you might want to lay it flat of it;s face and remove the back. A bad capacitor will be bulged out on the top. are Replace capacitors with the exact uf value and if you can go above the rated voltage but never below., If this isn't the problem then it is probably the main board (the board where your cable hooks up to), There are other things that cab causes for this but I would check the capacitors first.
Col. Dana Gillespie

Sep 09, 2014 | Panasonic Viera TH-42PZ80U Plasma TV

1 Answer

Why won't my dryer work?


Electric dryer no start does nothing

Check dryer Terminal block prongs both outside prongs should give combined 220, and 110 each if u check 1 outside & 1 center (ground) prong. Also check house electrical outlet for full voltage.

CHECK THERMAL SHUT OFF THERMOSTAT USUALLY LOCATED ON THE BLOWER. for OHMS or resistance with a meter. Should show a closed circuit. Ohms WHEN THIS FUSE BLOWS IT WILL SHUT DOWN EVERYTHING.

NEXT Test the PUSH start switch with meter for OHMS. Should show OHMS when pushed in or on start, and no ohms or infinity when in off position.

If you hear a humming/clicking sound from motor area you more than likely have a bad motor.
Try this test out to see if u have weak windings or relay/capacitor on motor.
Open the dryer door and turn by hand the drum while machine is on ON position. And you or someone else presses the door engagement switch in. If it starts up then u have bad windings

Another thing to check is the belt safety switch. With a multi meter.
Especially if u just replaced the belt. The belt safety switch is attached to the Tensioner and motor. IT LOOKS LIKE A DOOR SWITCH SOMEWHAT a little black pc of plastic with 2 prongs going into it. Sits at bottom of motor. Under the Tensioner. Attach meter clips to the 2 prongs on switch, Then when the little white push button is pressed in it should show continuity and none when released.

Lastly check ur DOOR SWITCH for continuity with a meter when the button is pushed in the (on/Door closed position,) it may have gone bad.

https://www.youtube.com/watch?v=sTRP6kHqAFs
Hey GOD IS GOOD !!!! WHICH IS WHY MY ADVICE IS FREE

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Tv shuts off when you turn it on again it will play a minute


I think this might be bad/swollen capacitors in your power supply, or something odd in the +5VDC circuits of the power supply, but I am posting all of the things I have found so far with these TVs.

Here are few possible solutions:
If you have no red light and you have a Megmeet MLT386 power supply, check these parts:
1) Swollen caps on the PS secondary circuit (may cause the red light blink or shutdown problems).
2) Blown fuse F1 (5A/250V) this is caused by a shorted FET at QA1 (20N60), you may also find that SMT cap CX23 is burned up (.001uf) which is in parallel with diode DA2 which may be damaged/shorted, replace these components.
If the power LED goes from red to green when powered up but no picture, then it might be lost +24VDC from the power supply:
3)Check fuse F2 (3.15A/250V, I put a 5A in), if it is blown, replace FET at QA2A (9N50C), replace QA2 as well (9N50C). Check SMT resistors at R233,R234,R235,R236 (.47 ohm). If open, replace with .1 ohm 1W or 2W resistor (easier to source). Also replace SMT transistor QF1 (2X4 or 2N4401 NPN transistor). And replace diodes at DS2 and DS1 (HER207), DS2 was shorted, DS1 was ok but I replaced it anyway.

I dont know as much about the Megmeet MLT169A, but it has similar problems and similar components.
4) I had to replace all of the capacitors in the secondary circuit (there are six in a 3x3 row marked EC9 (1000uf35V),EC10(1000uf35V),EC14(470uf35V) and EC18,EC19,EC20 (all 1000uf35V).

OK for the Megmeet MLT169A with red flashing LED when turned on we found that IC7 was bad. This is an SMT component on the solder side of the power supply. It is a 4407P (P channel 30V MOSFET). For testing purposes, we jumped across it to feed +5V to the TV permenently instead of allowing +5V to go into standby.

Sep 09, 2009 | Akai LCT3201TD 32 in. LCD Television

1 Answer

Samsung HC-P4752W power and/or convergence problems


Sounds like you soldered two of the convergence pins together by accident. If its shorted the TV will shut down.

Mar 29, 2009 | Samsung HC-P4752W 47" Rear Projection...

1 Answer

SAMSUNG HCM4215W Rear Projection HDTV shuts down


Low ohm resistors are open or poor solder connections on the bottom of a convergence IC.

You need to look at resistors in good light with magnifying glass. Bad ones may show as discolored or burnt.

The repair needs someone that has the schematic for the convergence cct, and can replace the burnt resistors or replace the whole convergence board.

http://calgaryconvergencerepair.weebly.com/index.html

If you are near Calgary, call me, if not, find someone that has done it before, preferably many times.

easyab

Aug 12, 2008 | Samsung HCM4216W 42" Rear Projection...

1 Answer

Samsung problems


If the fusible resistor is open, yes it could cause this problem. Check for others in the area as well. Is that resistor 3.9 Ohms?
I'm guesing yes. This is likely the current limiting resistor for the IC. There should be another for the other IC as well. Look for pico fuses in that area that may be open.

Dan

Jun 20, 2008 | Samsung HC-P4752W 47" Rear Projection...

5 Answers

Philips 42 in. Plasma shut down


did u cheak the input cables does it do it on dvd input as well as others ?

Feb 01, 2008 | Philips 42PF7320A 42 in. Plasma HDTV

1 Answer

Tv turns on but wont stay on


There is a resistor on the CRT board that goes bad sometimes. I cannot remember the number but it is a common fault as the TV starts up and then detects too much beam current and shuts back down. If you have a multimeter, you can check the resistors if you know how the color coding works on these resistors. If you do not, take the set to a repair shop, as this problem, if this is the problem, should not cost that much to replace a 10 cent resistor. Good Luck

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1 Answer

Shutdown protection? HELP please


All of the Denon recievers I have repaired (over 100) that shut down after a very short time are going into protect mode. The display lights up and after about 10 seconds the display goes out and the standby led blinks red.
I have found that they have one of 3 possible problems and they all require that the reciever be taken apart and fixed at component level. No way to tell what your problem is until it gets put on a bench and troubleshot.

Problem 1. This is the most common problem. One of the front channels shorts out. On the big heat sink the front channels are at each end. It is the front left channel (close to the display) This requires that the output transistors be replaced as well as some driver transistors and some resistors and a capacitor. Lots of work for a blown channel. Denon has put out a bullitin to upgrade the bias transistor and change a couple of resistors to help compensate for this failure. That channel overheats more than any other channel.

Problem 2. There is a resistor that is right next to the preamp board that opens up. It is a 10 ohm 1 watt resistor and when it opens, it causes the unit to go into protect.

Problem 3. The +12 volt regulator fails. It is in the power supply area on a smal heat sink right next to the -12 volt regulator. Generic part number is KIA7812 It also causes the unit to go into protect.

Most decent repair shops can fix these from about $120 up to about $200. Depending on which problem it is and how fast they are at finding the problem. Most charge labor by the hour.

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