Question about Electronics - Others

Open Question

I have a Tenma 72-8115 SMPS that is suppose to be putting out 13.8V but it only puts out 8.9V. I replaced all the power capacitors and the opto feedback circuit along with the regulators. While replacing the regulators it increased to 11.5V but quickly dropped back to 8.9V again. Please advise.

Posted by on

6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 293 Answers

SOURCE: how to replace a fuel pressure regulator

the fuel pressure regulator is on the end of the fuel rail it is held on by a torx screw relieve the fuel pressure using the schrader valve on the fuel rail remove regulator holding screw and replace new regulator be carful not to damage o-rings on new regulator

Posted on Nov 02, 2008

  • 13 Answers

SOURCE: Bad power board Planar PL2010M

There is a supplier of power boards online, you can google them with numbers from the board but I don't suggest using them. Look for information on the company also. I've seen a lot of complaints for this "international" company.

The fix for most of the problems on these monitors is about $8 on new capacitors (Plus shipping).

First check that you are getting a strong 12V from the external power adapter. If so, the problems may be as simple as changing out a few capacitors.

On the PL2010M monitors you need the following parts. I've added digikey part numbers to make life easier:

P10271-ND 220UF 25V Capacitor (3 or 4 depending on PS)
P10275-ND 470UF 25V Capacitor (1)
P10221-ND 470UF 10V Capacitor (4)

If you're not comfortable with soldering and de-soldering electronics, take it to a local technitian for the work and give them the parts list above. That should work to fix your issues. I've fixed several of these monitors so far. All the problems were related to the power supplies having bad capacitors. Same with the Planar PL1700 LCD monitors.

Good luck!


Posted on Dec 06, 2008

  • 31 Answers

SOURCE: the regulator freezes on my three burner Barbeques Galore Grill

This can happen when an excessive amount of propane gas is used or when if the tank you are using is not sitting upright, therefore allowing liquid propane to exit the tank through the regulator.

Posted on Aug 01, 2009

  • 1 Answer



I have edp70 30kva 3:3 out problom is that ups is just given me the 20 to 30 sec backup. and output 2 phase 220v last phase is given just 15v ac. plz send me the tecnicaly solution.And plz reply as soon as my email,

Posted on Jun 15, 2010

  • 623 Answers

SOURCE: 2001 harley ultra losses all electrical power and

It sounds as if the installed breaker is now failing. Brought on by heat as you well know. Rather than go to HD for another, go to a local auto parts store and see if they have one, it will be cheaper and maybe better quality. Bring in the one you suspect so they can match it.

Posted on Jun 16, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Power supply board not working, what section i have to cheke...?

Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

May 03, 2016 | Televison & Video

1 Answer

Philips 21"tv B+is over 150v .how to solve it.?

Check and replace all the small electrolytic capacitors at the hot and cold section circuit of the SMPS. Check and replace the opto-coupler and the control transistor to it. If you wish to get some details; visit the site linked here. Pull up older posts. Surf the site with patience.

Jun 12, 2015 | Philips Televison & Video

1 Answer

Ive had this bluray player for 2 years and it was working fine, then one day i tried to turn it on and nothing happened. i checked if the fuse was blown but i appears to be fine. so there is no power...

there is possibility of two complaints.
1, The SMPS power supply fault
2. the mother board fault.
if the SMPS is faulty the you can rectify the problem. If it is with the mother board the you have to contact the manufacturer .
First of all you have to check the SMPS ( switch mode power supply). you have to check the voltages at it secondary stage. 5v, 12v, etc
switched-mode power supply (switching-mode power supply, SMPS, or simply switcher) is an electronic power supply that incorporates a switching regulator in order to be highly efficient in the conversion of electrical power. Like other types of power supplies, an SMPS transfers power from a source like the electrical power grid to a load (e.g., a personal computer) while converting voltage and current characteristics. An SMPS is usually employed to efficiently provide a regulated output voltage, typically at a level different from the input voltage
for checkin the SMPS voltaes you need a multimeter. And check the voltages at it secondary stage
Added the inside view of BD 1600

if there is no outputs from the smps then you have to replace the SMPS drive STR ic near the big capacitor. Also ty to replace the OPTO coupler ic. y have to check the all resistors near the ic.

Remember one important thing that the capacitor can hold charge for some time even if you disconnect the power. so after removing the power. remove the SMPS very carefully. discharged the capacitor using a bulb.
i have also added a video for SMPS working for you reference will hep you for repairing your one


Apr 07, 2011 | Samsung BD-P1600 Blu-ray Disc Player

1 Answer

My tv tries to turn on but shuts right back off

SMPS circuit problem Check the SMPS . Replace opto couplers.

Do not switch ON TV without opto coupler in circuit. SMPS will go out of control and the + DC voltage will raise and spoil the circuits.

Sep 04, 2010 | Sanyo DS27930 27" TV

1 Answer

Turn on but for 2 seconds only and then turns off again.

Check SMPS voltages. Check optical coupler. Check SMPS components. It is difficult unless you follow a circuit diagram.

Sometimes replacing opto isolator may solve!

Caution : Do not switch on T V without opto coupler. ( if you remove for checking ) replace with new one as it is difficult check with service test meter.

Aug 22, 2010 | Televison & Video

1 Answer

Tv turns itself off after turning it on

Check SMPS circuit.
Check for dry capcitors. Replace OPTO coupler in the feed back circuit in SMPS.

Do not switch ON TV without opto coupler fixed in circuit.

SMPS will go out of control and the + DC voltage will raise infinitely and damage the other parts. If transistors used along with the opto coupler, check them for leakage. Replace them. Otherwise the replaced opto coupler may fail again after few days or few hours of TV working.

Aug 19, 2010 | Sharp 19K-M100 19" TV

1 Answer

What is the problem if only retrace line appears on screen and without picture output? what circuit has a problem if b+ voltage increases up to 150vdc and it kills the horizontal output transistor...

1. Check the opto coupler in the SMPS circuit. Replace it with
This is feed back, to the switching transistor to control the oscillator.
2. Horizontal out put transistor going defective.

This is due the failure of diode near the EHT coil primary and
the transistor. The reverse leakage of the high voltage diode can not be
checked by the meter. Hence replace all the black coloured diodes
in the horizontal deflection circuit diodes with identical part no.
Horizontal out put TR will get over heated and will rupture. When you
replace with new transistor switch on TV and switch off immediately.
The heat sink should not get heated or warm up. This is the only way
you can protect the transistor when you replace other components one
by one.

After checking all the small components, finally EHT coil.


Aug 19, 2010 | Televison & Video

1 Answer

Turns off by itself

Looks like SMPS problem. Check the power supply circuits for any leakage or short. SMPS will shut down for any fault condition in the circuit. After checking finally check opto isolator in SMPS and replace with new ones.

DO NOT SWITCH ON TV if OPTO I C is removed. SMPS will go out of control and the power supply capacitors will explode due to raise in voltage!

Jul 09, 2010 | Sony FD Trinitron WEGA KD-32FS130 32" TV

2 Answers

Sony Bravia LCD TV red light on the bottom of TV flashing but no signal to commence launch and the remote does not work and I have put in batteries


Your power supply board is dead, u know basic electronics’ and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like, to buy a whole refurbish power supply board for the replacement.

Hope this will help....

Jun 19, 2010 | Sony BRAVIA KDL-40S2000 40 in. LCD HDTV

1 Answer

I have a toshiba tp50g50 Tv.When I turn it on it shut it self off.I unplugged it and plug it back in and turn it on,still shuts off.

internal power +dc generation problem.Check SMPS and other circuits. feed back circuits. Check opto isolator which controls SMPS out-put. Contact service center for assistance

Apr 20, 2010 | Televison & Video

Not finding what you are looking for?
Electronics - Others Logo

Related Topics:

50 people viewed this question

Ask a Question

Usually answered in minutes!

Top Electronics - Others Experts


Level 3 Expert

102366 Answers


Level 3 Expert

75817 Answers

Brad Brown

Level 3 Expert

15557 Answers

Are you an Electronics - Other Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides