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Schematic dead at the powersupply no stable power at the base of the hot tarnsiter

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Yes it was fixed .I changed the original value of the cap to 47uf 63v which was connected between the ground and pin 3 of the power ic Tda16846 the power changed to 927 millivolts at the gate and was means the was two eletrolytic caps on the same stage with original one been bypassed by onother

Posted on Nov 04, 2008


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Power transistor burn

Make a Measure but first be prevent before unneeded pre damage of your fuses or new bought components using a 500 watt lamp in serial line of your main power to the powersupply on any way (and maybe if you have a variac) thats all the best way to doing some measurements and get a service manual or schematic. An error search tree is most times in it to see.
Then you can also most times quickly compare the left and the right channel with each other for failures or shorted or broken components on especially if you have some patience you will find seartenly the answer. leaking capacitors . but start by the power supply .

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2000 Isuzu rodeo headlights not working

daytime, running lights are mandatory there, not in USA !!!
ILL NOT GUESS ! (is that what you want, just wild guessing?)
just the head lights fail?
on high beam, slows and flashed? yes?
and all else is ok (even engine runs and car drives ok>?)
no power, what does that mean, using a voltmeter?

exterior fuse, my guess that means engine by fuse box,.
PDC, real name , names dont matter, but locations do..
my guess, is there are lot of things dead, not just head lights
but they are #1 first fix.why because they operator KEY OFF.and are a primary power feed.

so does battery have 12.6vdc rested.
are the battery terminals cleaned? all 4 ends. (not short it fiddling it)
if yes, then check the power in the PDC box.

ill look at for you, just a moment.....
(the schematics are best to use fixing any car)

ill pretend all else is ok, just HL failed, dead.(hi/lo)
HL 101:
the main box, must be hot, 12v there. HL ON.
the HL relay must close HL turned on.
The HL relay feeds 2 fuses next LEFT and RIGHT HL
if both fuses are hot, the ReLAY is good.

the engine bay fuse box EB has a 100am fuse and 50amp
both must be hot, both sides, hot means 12vd.
is it ?
that is first. as you told me there is no power external, so
i assUme the box is dead.
if not dead, then the relay is next.

see below your HL schematic
see relay see pin 2,
pin 2 must be 0volts headlights on.
if not the switch is bad below left or ground to it lost.
lets pretend it is 0v.
so we check relay pin 1 (output)
it must be 12vdc or the relay is bad.
pin 2 is 12v.
as is pin 5 at all times (called hot all the time )
these above steps finds all both HL dead. (not fuse blown)


25839813-xalgvmd0rrdo23whpinqegwp-3-1.jpg nobody ever posts country, why?
Canada does use different lighting, as do all countries, by LAW.

Aug 28, 2015 | Isuzu Cars & Trucks

1 Answer

D-link router (with 1 antenna and no modem) that has no power and no LEDs lit. the outlet still works to charge a cellphone. how do we fix the router?

Possibly the powersupply for the router is dead. Find another powersupply with same voltage output to try OR test the output tip with a meter. If the power supply does work then your router is dead. Replace it. If there is no power (5 volts or 12 volts etc) coming from the tip of the power supply adaptor then replace the adaptor / power supply.

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1 Answer

No, LED is not lit or blinking when I press Power. I am very sure that there is power in the outlet. How can I get circuit diagram/schematics so I can identify the right part and number. Also where would...


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 in solving the problem....

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1 Answer

System is dead completly what to do kaleemuk

if you have Desktop PC then Srist chack your Power Supply most the time is powersupply issue

open your CPU and chack your power supply how many what been used acording to that buy or cahck with simeler powersupply and chak

it is power supply problem only

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Screen went dead, unplugged the graphics card and

So basically you cannot get the pc to POST. Meaning you have just a black screen when you power on the pc, right?

First off, did you attempt to update BIOS before this happened. 90% of the time this is caused by a corrupt bios.

If you did not try to update BIOS before the problem started then try these troubleshooting steps.

1. Full power down. Unplug the power cord from the Power supply. Then hold down the pc power button.
Try to boot the pc.

2. Open the case and reseat the graphics card, hard drive, and RAM.

3. Take out one of the RAM sticks if there is 2 or more. Swap the RAM sticks in different RAM slots.

4. Set the Cmos jumper to clear. Power up the pc. Power down the PC. Set the Cmos jumper back to normal position, power up the PC.

5. Unplug and replug all the power supply cables.

6. Check the powersupply function. Either by a powersupply voltage checker, put the powersupply in a different pc, or try a different powersupply in the problem computer.

Could be bad ram, motherboard, cpu, powersupply, videocard.

If the video card is suspected to be damaged, try it in a other pc (friend's, mom's or dad's, pentagons' ).

if it is bad, there is your answer.

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No power to Eiki EIP-2500 projector

there is a fuse on the power supply. if the fuse is good, you'll need to replace the power supply.

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Acer AL1713 flashing power LED

Check out above link for AL1713 schematics and service guide.
Based on your explanation it seems you have some shorts problems with the other board.

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" Power Supply voltage (+5V) is too low for stable operation. Please restart DM-24".
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Being able to read a schematic and understanding how a TV works are two different things. These chassis that RCA used in these sets can be somewhat complex to troubleshoot. I would geuess that unless the power light comes on at all then you have a dead power supply in the TV.

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