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Sony TV has a power supply problem both ics irf1b7n50a in the power supply section are all shorting which number could I use as an equivalent. is there a way I could use a power modular with two power id's

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Hi Saidi
Have you checked all the other components used in the main power supply regulator section circuit, before replacing a new STR? You should do it. There should be a reason for the failure to STR. You should find it, and rectify it, before replacing an other STR. Check all the small components, resistors, zener diodes, small value ceramic capacitors etc: Make sure all of it are OK. Especially give a keen attention to zener diodes used; if any. It will be best to replace these diodes, even if you do not find any fault with it with multimeter test.For more information go to http://electronicshelponline.blogspot.com/
Power supply schematics to some popular brand TVs are given. Pull up older posts. Good Luck.

Posted on Nov 27, 2013

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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jerryg50
  • 1667 Answers

SOURCE: Sony 2167 No power on

I have not worked on your particular model. But, I have serviced many TV sets over the years. My answer will ge generic.

Check all the capacitors in the horizontal output stage and power supply areas for high ESR. All the caps that are out of spec must be changed.

The high voltage multiplier & flyback can also cause the fault you are having.

You have to consider that the DC voltages are not the only important spec that has to be met. There are also many power drive signals that work with reactive devices. If there is any defect in the critical areas there will be failures.

Jerry G.


Posted on Nov 26, 2008

  • 119 Answers

SOURCE: part help

the vertical o/p generic number stamped on the fron of the ic is "TDA8172" the sony part number is "8-759-980-58". good luck

Posted on Mar 13, 2007

daniel719
  • 240 Answers

SOURCE: Sony TV KV-32v15 Dead Power Supply

you should of recived a 0.01ohm resistor it is wite and sayes sony on it.
its a flame proof resistor that needs to be the very same
look for it on the pcb test it its probly open right.
ask them to send you the right part.
regards,
daniel.

Posted on Jan 11, 2009

  • 4234 Answers

SOURCE: sony color TV model kv-c29 11d blown power supply ic and transist

There should be circuit designations printed on the PC board. Without those, there are too many possibilities to give you anything useful. Can you provide those please?

Thanks,
Dan

Posted on Jan 21, 2009

  • 50 Answers

SOURCE: my sony tv model no. kv-ha21m80 is on standby mode & its LED is blinking four times that means it has some problem in vertical section.But when I tried to check voltages of its vertical IC AN5522

Disconnect Vertical supply and so that your Horizontal system run check all voltages before connecting vertical again ...should the protection come in again when vertical connected ...replace Vertical Ic and safety resistor in line

Posted on Apr 21, 2012

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1 Answer

Sony tv power supply regulator ic CXD9841P


Go to shopjimmy's web site. You'll find it there.

Nov 17, 2014 | Televison & Video

1 Answer

When I turn on tv,it shows a white screen and don't anything do


Hello
You haven't specified anything about your TVs sound condition. If the sound is there and only the picture is out, leaving a white screen behind, it is due to the R-G-B output section of your TV. The section mentioned above comes on the picture tube base card, a circuit board connected on the neck of the picture tube, directly pluged onto it, with the help of a socket called picture tube base socket. You just measure the voltage to it first. The main voltage comes to it from the secondary voltage winding from the line output transformer, [LOT], generally, or from the SMPS power supply itself. It will come upto 260VDC, and must be there. If this voltage is missing, the fault you mentioned will occur. If this voltage is there, the fault may be due to a decective video output section. It may be built in with transistors, or an integrated circuit [IC].
Usually, Samsung uses Philips IC, number [TDA 6007B], or its equivalent in this stage. Check for any loose, or bad soldering on the terminals of this IC. I advice you to resolder all the pins of this Ic, by applying a little more soder, without making any short circuit bridges in between them. zin most cases, this will solve the problem. If it doesn't help, replace the IC with an identical in type and number.
If you wants anymore asistance, feel free to get me through Fixya. OK.

Dec 20, 2010 | Samsung CSN2077 20 in. TV/DVD Combo

1 Answer

What is the first step in troubleshooting color television? dead set..blown fuse..


Hello
You haven't specified anything about your Sony Tv. No model number or anything to compare. Although I hereby giving you a general trouble shooting method, first adopted by technicians like me. You have stated that the fude has blown out. Fuse will not burn out without any reason. it is a protective device used in every telivisions,as if any internal components inside it gets shorted, especially in power supply section, the fuse will get burned and protect the other components from further distruction. Therefore you have to trace the reason for the failure of fuse first.
You must beging it from power supply regulator section itself. Chech the resistance accross the main filter capacitor first. Set the multimeter in Ohms range, and the resistance must be above 250Ohms in one direction, and upto infinite in the other direction. If both readings comes below 20Ohms or so, suspect the power regulator Ic; usually sony sets udes STR type regulated power supply, and this STR will get shorted. As you haven't specified your sets model, I can't make sure whether it is circuted with STR or a switching transistor. As both cases, this regulator has a chance to get shorted. Desolder it out and check for short. if it finds shorted, check the rlated components also, such as zener diodes and resistors, for open and short,as they also will get damaged due to this main switching transistor, or STR; whatever may be.
Check the degaussing posistor for short. Check the rectifier stack for short. Check the mains filter capacitor for short. Check each and every diode for short. you must measure the forward reisistance of diodes with multimeter set in 100KOhms range. There shouldn't be any slight leak with this test. If it shows a slight leak, replace it. You just do these and inform me the result through Fixya. I'm ready to assist you furthermore. When you reply to me; please include the model number of your Sony Tv. Ok.

Dec 12, 2010 | Sony Televison & Video

3 Answers

No Display, no sound- not working, showing dead. But input Power is ok. Picture tube filamment not getting power. model sony KV-2192M3


Hello
Check the input fuse first. If it is blown, there will be some short inside the power regulator circuit. Usually Sony sets uses STR regulated power supply. You can see this STR, and Ic, screwed onto a heatsink. Replace it with a same type and number. Before replacing the STR, check the diodes used in that section for damage, mainlu zener diodes. They might get shorted along the blowing of the STR. Check that section throughly before resoldering the new STR.
If any further assistance you needs, get me through Fixya. Ok.

Nov 27, 2010 | Sony FD Trinitron WEGA KV-21CL10 21" TV

1 Answer

We have no picture or sound. The sttandby light blinks 7 times then a pause and blinks 7 more times. it keeps repeating this. This is a Sony Trintron TV


Hello
Seven blinkings of stanbylight in Sony sets denotes a High-Voltage shutown problem. Not means the high line voltage, but the fault inside the tv itself. You haven't mentioned about the model number of your TV, yet I'm going to describe you considering this as a standard Sony problem.
The fault is mainly due to the internal power supply regulator section in your TV. It is now supplying voltage more than normal that it is meant for, as a result the EHT [Extra High Tension] voltage to the final anode of the picture tube goes higher than normal, and the microcomputer Ic inside your Tv detects this voltage difference and giving you the fault symptom in 7 continous blinks. That Ic is so programmed such, it will blink with certain times according to the fault comes inside, and helps us to locate the faulty section without opening the TV.
As I said above the fault in your TV lies on the power regulation section. You just open your TV and locate that section, which can be easly located as the main power just goes to that portion, and there will be a regulator normally Sony uses STR***** type IC regulators, which will be screwed onto a metal heatsink to radiate heat from it while it works. These will heat up to 80 degree C, while working, and the heat generated by this ic can cause loose solderings on its legs. You resolder its leg solderings, and suspected solderings around it, by applying a little more solder. In most cases this will resolve the problem. Ok.

Nov 13, 2010 | Sony Televison & Video

1 Answer

In my tv fuse is blowing off immediately


Hello
If fuse blows off immediately, i means that there is a short circuit occured in your telivision. This can mainly due to some diodes or regulators inside your tv. An overvoltage, spikes, ie [sudden high rise and go low], in the supply votage in your home, could damage power supply regulator components inside your tv.
All Sony Tvs has high accuracy power regulating systems inside. It is an onboard assembly, usually take 1/4th of the area of the TV. In older Sony TVs, this section was built in with use of transistors of different types. But your tv is not so old, so its power supply system is built with an STR, an Ic meant only for power regulations. Normally it willb numbered STR S6707, STR S6703 etc; according th the working voltage of the main board, and screen size of the TV.
This STR may get shorted due to power fluctuations, or any other reasons. A I mentioned above this is an Ic look like small squuare biscut of about an inch in square, and will be black in colour.
The rectified main power supply is given to it via an SMPS transformer [Swiched Mode Transformer], and the Ic will swictch it on and off at the rate of sbout 25KHz or more, and this transformeres secondary voltage is used to power up the other part of the ciiruit board.
If the fuse is blowing as soon as the set is switched on, this Ic will be faulty [Shorted inside]. If you put an another fuse, it also will blow up due to short. It is not good to play with power supply system by doing this as it may harm to other components also.
You have done it I thinks. Here in India, we gets 220VAC as home power supply. Sony TVs used here have a fuse rateing of 250V 3.5Amps. If your household supply system voltage is also this you must put only this rated fuse. If it is 110 or 120VAC, the fuse rating may differ; and will go upto 6 to7 Amps. More than this rated fuse should not be used.
You just do one thing. Just open the back cover of the TV, locate the power regulator section, and chech whether any main rectifier diodes for leak. There may four of them. In some sony Tvs, rectifier stalks are used. Check it for leak. If thery are all good, measure the resistance across the main filter capacitor with a multimeter set in Ohms range. If the STR said above is short, the meter will give full scale deflection. Unsoder the STR and pick it out after loosing its fixing screws to the heat sink. Again check the resistance accross the main filter capacitor. It must sho a low deflection or no deflection at all. Never replace the STR with a new one as there may be some other faulty components in that section. Usually when STR fails, there are some Zener diodes, Wire wound resistor etc will also gets shrted. If you replce the STR before checking them for fault, the STR you puts in will get shorted as you swich on the set. It will take just 1/100 part of a second.
So check all the components related with power regulator system, and then only repace the regulator. Caution: Keep chlidren away from you while you open the tv. Never touch any part of the circuit board while power supply is there. Plug out from the wall socket each time you touch the printed circuit board. As your Tv screen size is 32", an approximate of 25KVDC [15,000VDC], will be present at the first anode of the picture tube while it is working. It is too dagerous to contact.
If you haven't through knoledge, skill and patience, never try to repair it. If you knows to follow its schematic digram, buy one book and follow the circuit.
Keep an adult beside you as you try to repair your set, as a precaution.
If you have any doubt, report to Fixya, they will give me alert. Ok

Oct 20, 2010 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

My television has a blue screen and the red light at the front of the television keeps flashing,how do i get it to work?


Hello
Your telivision may have its Chroma Ic faulty. Sony TVs uses their own coded numberd Ics, usually begin wi CX xxxxxx, or Philps TDA series Ics. These Ics contains so many sections integrated to one. That is Horixontal, Vertical, Synchronisation for both horizontal and vertical, video out drive section and its matrix, video If section, sound filtering section and so on which comes over 68 sections or so.If any of the among said section gets faulty, your tv will have some problems.
Here you can see a Blue screen. Therefore video out section of your TVs Ic is working well. The red flashing LED in the front of your tv indicates that there is some kind of short, not direct short, inside your TV.
You just do one thing. Open the back cover of your TV and find out the IC I have mentioned above. Switch on your tv, wait for 5 minutes or so, switch it off, unplug it from mains, and touch on the surface of the said Ic with your bare fingers and find whether it is overheats or not. Such types of Ics can be heated upto60 to 65 degree C. Not much more. If that Ic is faulty, it will heat up to a condition, which you can feel.
If there is no overheating is noted, there may be some low voltage missing. Sony TVs works on 112vDC main rail, 8VDC secondary rail, 5VDC for system control section, and 24VDC and 18VDC for vertical output and sound output sections.
Normally we noted is the missing of 8VDC rail. This 8VDC is derived from the secondory voltage of LOT, through a stepdown *V regulator Ic. If that Ics soldering point gets loose conatcted, of that Ic itsef is faulty, This kind of fault can occur.
If you are going to do it by yourself, keep the children away, and let an adult beside you as a precautionary measure. Never touch any part inside your tv while power supply is on. Take out power plug from the socket before touching any parts.
As yours' is a 27" TV, at about 25KVDC [25,0000VDC] points will be there inside. Keep Caution. Ok

Oct 20, 2010 | Sony KV-27S66 27" TV

2 Answers

I have a sony kv-36hs20 that will not turn on it just clicks and the power lite flashes about three different codes i think thats what that means i worked in a tv shop yrs back and have a little experence


hello!since you have an experience in repair,try to have a voltage data on the circuits of your tv..check whether there is a supply output from the plyback secondary,does the heater of the picture tube is lit?if yes your plyback is working fine,,if not,check the horizontal output transistor for any leak,open or shorted.do it same to the regulator.if these two transistor is bad replace them..check also for any leak capacitors on your horizontal section.there might be a problem in there..same with the capacitors on the power supply section.If The plyback transformer is not switching replace the jungle ic.this ic generates the horizontal pulse to the plyback..good luck hope i helped you..

please rate my help.

Jun 04, 2010 | Sony FD Trinitron WEGA KV-36HS420 36" TV

2 Answers

Power button doesn't do anything, remote doesn't work, 4 blinking lights. Sony kv 36fs120.


you have power issue. short the prongs for a minute. then remove the short wire. then test. if not succesful go to your nearest service center.

Apr 27, 2010 | Sony FD Trinitron WEGA KV-32FS120 32" TV

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