Question about RCA 27V550T 27" TV

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Dead tv unit is dead.Further cheking finds Dp027 shorted.Nothing else was shorted.Replasing the diode and reapplying power again shorts dp027 again.

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Re: dead tv

You can also check cp025 & cp024. Now the problem with this power supply is if you find a problem with one of the following parts the have to be all replaced at the same time, because if one part goes it casuses stress on the other parts. Check the test the following parts tp020 dp033 tp023 (if installed) tp025 (if installed) tp022 (if installed) typically only have 2 of the last 3 installed in this tv. good luck.

Posted on Nov 10, 2006

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Tv powersupply fuse is blow, replas new fuse but same problam.


There is some short circuit in the power retulator side of your TV. Never put a fuse and switch it ON, as it may damage more components in your system. A power voltage surge can damage the regulator side of your TV. There is a short [Direct short] occured inside it. Check the rectifier section first, with the help of a multimeter set to Ohms range. Measure the resistance accross the main filtler capacitor. if it seems to be very low, say less than 12 Ohms or so, resolder out the mains rectifier stalk, or diodes, whichever may used, and chck it for juction short. If shorted, replace it. Check out the switching regulator also. In most cases this regulator may get damaged due to power supply spikes. In some sets, there is a MOV [Metal oxide veristor], connected accross the main AC line, after the switching point. this component is used as a protection, and if there comes any overvoltage or voltage spikes, this veristor will get shorted, blowing off the fuse, and further damage is prevented. Check this also. This component will look like a disc capacitor, normally black or green in color. Check these, and further check most of the power regulator components, such as Zener diodes for short. Before switch on your TV. make sure you have tested all the componets in the power regulator side. OK.

Jan 28, 2011 | Hitachi C29-F800S 29" TV

1 Answer

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

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 Standard (CRT) Televisions

1 Answer

The picture does not come on when I turn it on.


Your TV is now in dead condition I should say. You should strart from its power supply regulation section itsef to rectify the fault. Look into the fuse, a glass fuse is there, in power supply board. If It has found blown, make sure that there is something short in either power supply regulator side, of on the other part of the printed circuit board.
You just place a fuse of same rating as used, if the fuse is blown. If the fule you installed newly also blows off, check first the retifier stalk for any leak. The stalk contains four diodes, even any one of them gets shorte, fule will blow up. If there is no leak in the retifier stalk, measure the voltage resistance across the main filter capacitor, a bulky one capacitor fitted in the power regulator section. If you see a full deflection on meter, it means that there is some dead short inside the power regualtor system.
Usually Sony uses STR regulated type power supplies, and some uses MOSFET [Metal Oxide Semiconductor Field Effect Transistors], as switching elements. Bothe of these types can be shorted, due to a high voltage spikes, or a sudden supply failure and restart.
Check out short test on these components, out of board, that is, desolder it out from the circuit board. You just resolder one by one and measure the resistance ad described above. Thus you can find out the exact component, that have a short. If any of these components shorted, check the entire power regulator section for any more component failure, like zener diode short, resistors opened, and so on. You should have a concept of soldering and a little knoledge in electronics. There will be a MOV [Metal Oxide Varistor] fitted across the power supply input, which look like a disc capacitor. it will get shorted when a certain voltage spike occures abvve its rated voltage, and apply a dead short at the supply stage. If any of them used, desolder it out and check for any leak, and is found leaky, replace it. It is used as a saftey measure, and without it the set will work fine.
Just check these and if you find any difficulty, contact me through Fixya. Ok.

Nov 29, 2010 | Sony KV-36XBR450 36" TV

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

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

2 Answers

Dead Set after power surge

Check the power supply transformer primary driver transistor and the associated components (some diodes and capacitors, resistors, an optocoupler maybe) and the rectifier diodes (or a bridge) and capacitors at the transformer secondary, what you are looking for is a short circuit, however, the short may as well be in another section of the circuit board (a shorted component may sometimes have signs of damage caused by heat, but this is not a rule).

Hope you can find out what it is...



Oct 01, 2009 | Standard (CRT) Televisions

1 Answer

Blinks twice pause blinks 4 times

Dead or Shutdown symptoms.
Dead symptom reported to be caused by the following:
1. Dead.
Found Q601 & Q602 shorted, R615 open, and IC600 on the A Board were the cause of the symptom.

2. Dead.
Found D614, Zener diode, on B+ line was shorted.

3. Set shutdown and the standby LED blinks 3 then 5 times.
Found 200v line was low. Disconnected CN706 on the C Board and found 200v now
present on CN706/pin 7.
Found: IC702 (C board) shorted the 200 volt line.
HQ Comments: C541 on the A Board could become defective if the 200v line is shorted since
the polarity on the capacitor will become reversed. R553 fuse resistor could also be opened
on the A Board.

4. Error code of 4 blinks .
Dead set press power button you hear the relay and you see red led flash 3 times and stops? Has no HV or other action. Tech removed the back as no 200 volt supply, did unplug CN706 and now has 200volts. Tech did remove the IC702 and same it comes up so needs this IC.

5. Dead. 5 blinks then 3 blinks. Found shorted Damper diode D504. Q502 has a built in damper, as well.

6. The TV does not turn On and the LED flashers 9 times.
Found one side of R610 open on the Base of Q690 on the A board.

7. Dead, 9 flashes, Q606
Would not start when cold, has stand by 5 but relay never energize.
No response from front panel or remote controls.
9 blinks is not in service manual.

Found Q606 (Zero Det.), on the A Board, had no soldered on the collector
of the transistor causing an intermittent connection.
Soldered the collector of Q606 and set returned to operation.
HQ Comments: Also refer to E30968554.

8. Dead. 5 blinks or 3 blinks
Found on the A Board D611 in the Power Supply open, and Hor. Output Q502 shorted.

9. Found Power Supply components D611 shorted causing Q600, Q601, and R615
to fail on the A Board.

10. No picture or sound. Standby flashes.
Found Q512 (Pin Out) shorted. on the A Board.

11. Dead. No sound or picture.
Found the FBT and Q502 were shorted, and R615 open on the A Board.

12. Dead
No power, Stand by light flashes 4 times.
Found T604 and IC601, replaced.
Found D611 on the A Board was the cause of the symptom.

13. Dead.
Found D534 shorted on the A Board.

14. Shutdown 4 Blinks.
Replacing R595, OCP Latch Q532 on the A Board, fixed the set.
PN 1-247-891-00, 330K 1/4 watt.

15. Unit shuts down after 15 mins.
Immediate shutdown - sometimes it give a 3 blink, sometimes nothing.
Found R595 (330K) was open located in the Q532 OCP Latch circuit.
R595 P/N 124789100 330k 1/4w

16. Won't power up. LED Blinks 4 times, B+ is very low
B+ is at 49V, +15/-15 only coming up to about 1 volt.
Wth Hor Out disconnected B+ only comes up to 50v.
Found D611 on the A Board was the cause of the symptom.

17. Intermittently does not turn on
Found a intermittent C633 on pin # 3 of IC600.
C663 P/N 113647911 Film cap .001uf 100v


If you need the service manual contact me

Jan 27, 2008 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

No power

well "panas" your problem most be a short diode in the power supply one of the 4 rectifier diode must be short if you know about diodes and how to solder is a pice of cake if not dont fool around there is very dangerous and is a cheap repair at leas in my town...good luck and rate me....

and for you "abat" your case is not easy becouse could be a couple of things from a short horinzontal transistor to a damege fly back realy you need a tech.....good luck and rate me

Dec 04, 2007 | Panasonic CT-32SL14 32" TV

2 Answers

Black screen no sound

What is the model or chassel number it be a few thing H.O.T Resistor Caps etc..most likely horizontal output transistor.

Nov 12, 2007 | Standard (CRT) Televisions

1 Answer

Fuse blows when it gets plugged in

No it doesn't sound like a resistor, it sounds like you have a short in power supply, you can look for bad Diodes in bridge rectifier,or solder bridge, or transistor short, start from beginning to end. It is definately a short and most of the time resistors open and this will not cause a blow just a dead set.

Sep 21, 2007 | Emerson EWF2703 27" TV

1 Answer

Top four inches of screen running horizontal is distorted.

The problem is most likely in the vertical circuit, possibly the vertical IC itself or one of the feeder caps in that circuit. Could be possible poor solder connections on the IC also. Is the problem intermittent? There are a number of common problems with this unit effecting the following parts: Dp027 (27v Zener) P/N 244835 Tp022 (Bc648) P/N 198743 Tp025 (Bc558) Ip001 P/N 257786 Ip050 Ic Voltage Regulator , Zener Diode With 3 Legs Looks Like Diode. Ip030 263567 Dp057 232662 Tp052 198743 Tp020 (2sk2842) P/N 263692 Tp023 (2sc8550) P/N 257827 Dp025 244870 This is an ITC008 chassis built in mexico and the problem you're describing should be an inexpensive repair - but my downside opinion is that with this particular unit you could expect the next problem in about one to two years. Being a certified technician there are few TV's that I would tell a customer to walk away from if they were considering a purchase - but this is one of them. I'm sorry for such a negative review, please don't take it out on my rating for this solution. But if you have it repaired take it in yourself and save a few bucks - and ask the shop to save all the old parts for you. Good Luck Bill

Jun 12, 2007 | RCA 27F530T 27" TV

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