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Dead set tv,power supply is good but no output voltage going to HVPS.no sound and picture.

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  • Mike Hunke Sep 27, 2008

    the fuse was blown and the 2.7 ohm power resistor was open. I replace both and the fuse blows again. The power supply seams strange to me. The unregulated supply is rectified then it goes to a transformer to the regulated supply. How can you step down DC using a transformer. A schematic would be helpful.

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Hi

is there power in unregulated power supply? if have a power what is voltages? did you check the regulated power supply? or in the Hot area?

Likha!

Posted on Sep 26, 2008

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No power to kv-27fs120. suggestions on repair


Is it completly dead or do you hear a click (internal to TV)?
If completely dead - check main ac fuse.
Otherwise here are some tips:

A dead set (no picture no sound) can indicate any number of problems – Usually the set is in shutdown or protection mode – this means that the internal circuits have detected a problem with a supply voltage missing, drawing too much current, going over voltage or a short condition.
The first thing to do is power off the set unplug it for 5min. than replug and try again. This in effect resets the main micro and will sometime unlatch a fault and resume working. There are certain common problems based on the make model (forSony -bad solders on horizontal drive transformer/regulators short)– for instance convergence output IC’s(CRT projection TV’s) can cause a dead set symptom in many models. Vertical output IC failure can also cause the same symptom (CRT standard and Projection).
The only way to determine the real cause is :
By an educated guess based on experience or by directly troubleshooting the set – checking fuses, measuring voltages and checking for shorts. Many of the intermittent problems such as, int.(Intermittent) no sound or picture, int. picture shrunken or misshaped. These problems are generally due to cold (bad) solder joints (all TV’s and electronics) that break down under slight temperature changes or vibration and are usually verified by physically tapping the suspected area on the circuit board, or by quickly heating or cooling a suspected component or area ( cold spray and hot air gun). The other main culprit is leaky or dried out capacitors or capacitors that change value depending on temperature. These can sometimes be seen as bulged or leaky and have an acrid odour. Be sure to vote/rate me if this helped Thanks!

Oct 30, 2009 | Sony FD Trinitron WEGA KV-27FS120 27" TV

1 Answer

JVC AV-32220 TV WAS WORKING FINE....NOW NO PICTURE OR SOUND BY


Power supply capacitor is usually suspected.
Read below and decide if you want to tackle the problem yourself if so I’ll help along the way with what info I have. If not contact the nearest repair shop armed with the info below.

A dead set (no picture no sound) can indicate any number of problems – Usually the set is in shutdown or protection mode – this means that the internal circuits have detected a problem with a supply voltage missing, drawing too much current, going over voltage or a short condition.
The first thing to do is power off the set unplug it for 5min. than replug and try again. This in effect resets the main micro and will sometime unlatch a fault and resume working. There are certain common problems based on the make model – for instance convergence output IC’s(CRT projection TV’s) can cause a dead set symptom in many models. Vertical output IC failure can also cause the same symptom (CRT standard and Projection).
The only way to determine the real cause is :
By an educated guess based on experience or by directly troubleshooting the set – checking fuses, measuring voltages and checking for shorts. Many of the intermittent problems such as, int.(Intermittent) no sound or picture, int. picture shrunken or misshaped. These problems are generally due to cold (bad) solder joints (all TV’s and electronics) that break down under slight temperature changes or vibration and are usually verified by physically tapping the suspected area on the circuit board, or by quickly heating or cooling a suspected component or area ( cold spray and hot air gun). The other main culprit is leaky or dried out capacitors or capacitors that change value depending on temperature. These can sometimes be seen as bulged or leaky and have an acrid odour. Be sure to vote/rate me if this helped Thanks!

Oct 17, 2009 | JVC AV-32220 TV

1 Answer

My set wont turn on either manually or with the remote


Common Fault:
In this case it's likely just a fuse - main fuse in power supply (6.3A 250V)


Read below and decide if you want to tackle the problem yourself if so I’ll help along the way with what info I have. If not contact the nearest repair shop armed with the info below.

A dead set (no picture no sound) can indicate any number of problems – Usually the set is in shutdown or protection mode – this means that the internal circuits have detected a problem with a supply voltage missing, drawing too much current, going over voltage or a short condition.
The first thing to do is power off the set unplug it for 5min. than replug and try again. This in effect resets the main micro and will sometime unlatch a fault and resume working. There are certain common problems based on the make model – for instance convergence output IC’s(CRT projection TV’s) can cause a dead set symptom in many models. Vertical output IC failure can also cause the same symptom (CRT standard and Projection).
The only way to determine the real cause is :
By an educated guess based on experience or by directly troubleshooting the set – checking fuses, measuring voltages and checking for shorts. Many of the intermittent problems such as, int.(Intermittent) no sound or picture, int. picture shrunken or misshaped. These problems are generally due to cold (bad) solder joints (all TV’s and electronics) that break down under slight temperature changes or vibration and are usually verified by physically tapping the suspected area on the circuit board, or by quickly heating or cooling a suspected component or area ( cold spray and hot air gun). The other main culprit is leaky or dried out capacitors or capacitors that change value depending on temperature. These can sometimes be seen as bulged or leaky and have an acrid odour

Oct 03, 2009 | Panasonic CT-36SX31 36" TV

2 Answers

Won't turn on and stay on but makes a high pitched buzzing noise


I have found the horizontal output transistor (HOT) to fail and then causing the flyback transformer to fail. Both parts are under $30 total, but the danger is in replacing them. Make sure you discharge the flyback to the ground strap.

Oct 02, 2009 | RCA F36650 36" TV

1 Answer

No picture/sound


It is not likely your picture tube especially if the picture was good b4 it went dead.
Read below and decide if you want to tackle the problem yourself if so I’ll help along the way with what info I have. If not contact the nearest repair shop armed with the info below.

A dead set (no picture no sound) can indicate any number of problems – Usually the set is in shutdown or protection mode – this means that the internal circuits have detected a problem with a supply voltage missing, drawing too much current, going over voltage or a short condition.
The first thing to do is power off the set unplug it for 5min. than replug and try again. This in effect resets the main micro and will sometime unlatch a fault and resume working. There are certain common problems based on the make model – for instance convergence output IC’s(CRT projection TV’s) can cause a dead set symptom in many models. Vertical output IC failure can also cause the same symptom (CRT standard and Projection).
The only way to determine the real cause is :
By an educated guess based on experience or by directly troubleshooting the set – checking fuses, measuring voltages and checking for shorts. Many of the intermittent problems such as, int.(Intermittent) no sound or picture, int. picture shrunken or misshaped. These problems are generally due to cold (bad) solder joints (all TV’s and electronics) that break down under slight temperature changes or vibration and are usually verified by physically tapping the suspected area on the circuit board, or by quickly heating or cooling a suspected component or area ( cold spray and hot air gun). The other main culprit is leaky or dried out capacitors or capacitors that change value depending on temperature. These can sometimes be seen as bulged or leaky and have an acrid odour.

Sep 27, 2009 | Sanyo DS31520 31" TV

2 Answers

Toshiba tv - power on - black screen and power light blinking -


Read below and decide if you want to tackle the problem yourself if so I’ll help along the way with what info I have. If not contact the nearest repair shop armed with the info below.

A dead set (no picture no sound) can indicate any number of problems – Usually the set is in shutdown or protection mode – this means that the internal circuits have detected a problem with a supply voltage missing, drawing too much current, going over voltage or a short condition.
The first thing to do is power off the set unplug it for 5min. than replug and try again. This in effect resets the main micro and will sometime unlatch a fault and resume working. There are certain common problems based on the make model – for instance convergence output IC’s(CRT projection TV’s) can cause a dead set symptom in many models. Vertical output IC failure can also cause the same symptom (CRT standard and Projection).
The only way to determine the real cause is :
By an educated guess based on experience or by directly troubleshooting the set – checking fuses, measuring voltages and checking for shorts. Many of the intermittent problems such as, int.(Intermittent) no sound or picture, int. picture shrunken or misshaped. These problems are generally due to cold (bad) solder joints (all TV’s and electronics) that break down under slight temperature changes or vibration and are usually verified by physically tapping the suspected area on the circuit board, or by quickly heating or cooling a suspected component or area ( cold spray and hot air gun). The other main culprit is leaky or dried out capacitors or capacitors that change value depending on temperature. These can sometimes be seen as bulged or leaky and have an acrid odour.

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1 Answer

No picture, No sound


Hi there!
If the set is dead after the popping sound, then it has probably blown a component due to high voltage. Everything inside a tv starts with the power supply. Nothing will work unless the power supply is 100%. I don't know what your rates for repairs are in general, but the price sounds good. The final decision is yours to repair or replace. Good Luck, JUS004

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1 Answer

RCA 35V432T Dead Set


Check for a high voltage power supply section of your TV set...
Especially in flyback transformer.Be careful to do so because the output voltage of the flyback transformer is almost thousand volts.

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1 Answer

Dead unit


your problem is that your output is less than normal

first you isolate h/output from power supply if it comes to normal(115V).

then problem in h/output stage

for that you check

h/output,cap & diode in flyback section & flyback transformer.

but power output is still 50v then problem in power supply for that check oscillator ckt & switching output.

good luck.

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1 Answer

Television wont turn on.


try to check first if theres an output voltage in the wall outlet. if there is, you have a completely inoperative (dead) set. this symptom is usually caused by a breakdown in the power supply circuit. in most modern receivers (transistorized and/or IC), it may also be caused by a breakdown in the horizontal deflection circuits (horizontal oscillator, pre-drive or drive circuits). this is because the supply voltages for the tuner, video intermidiate frequency (VIF), video amplifier, sound intermidiate frequency (SIF) and vertical output circuit are usually supplied by the horizontal output circuit. but again, if you are not inclined in this kind of job, better bring it to a qualified tv technician. good luck!

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