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I have philips tv has no power or dead set at first i replace the p6na60 transistor and tda4650-3 ic and nothings happen?

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This happens... the best sollution i can give you to take it to service center

Posted on Mar 31, 2011

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Toshiba model#57H94 dead set push power switch nothing want start up dead main ac fuse check good.Sam's Tv Service any help will be appreciate. Thanks


Check hori output and small blue high voltage capacitor 2k that feeds hori output transistor.
If these componets are OK then replace Both of the STK ICs they are big black ICs and will have PN# on them.example STK392-110.
Mats Electronics has ICs 1-800-628-1118
Encompass Parts Distribution has Free Service Manual for this Model# 57H94 you can print it out online.Go to their website.

Jun 05, 2011 | Toshiba 57H94 57" Rear Projection HDTV

1 Answer

No power ticking sound when plug into outlet


Hello

Your Philips Tvs line output section has some trouble with it. All philips power supply circuits are so designed that, even a small short circuit in the ciruit board occurs, the power regulator will sense it, and the entire system will shut down, and that is happening now in your TV.

You just start with the horizontal output transistor, fitted very close to Line Output Transformer [LOT], for any short. You must desolder it out from the circuit for this check, and check it for collector to emitter leak. If this will happen, the main regulated power supply ie 120VDC, will gets shorted through this transistor, cause a dead short circuit. If it is shorted, you must find out the reason for that short.

If LOT said above has damaged, this transitor will also get shorted. In otherwords, if LOT is damaged, its driver transitor,will also will get leaky. You just replace this transitor with an identical one. Switch on the tv for a while, say 10 seconds or so, check its heat effect. If it heats up abnormally, surely LOT has damaged, and you should replace it also with an identical type and number. Ok

Nov 24, 2010 | Philips 32PT563S 32" TV

4 Answers

Shutdown after video comes up the green power light stays on but the set will not shut down while changing channels. (philips 27 pt543s) ic702 eeprom and ic7200 control/signal processor has been...


Re:"shutdown after video comes up the green power light stays on but the set will not shut down while changing channels."

Hi.

I do not think this has anything to do with logic circuits and video processing. When you stay on one channel the horizontal and vertical alignment circuit works more than if you change channels all the time.
This is just a guess, but have a look at convergence ICs. when you keep changing channels the power amp ICs (or transistors) go on and off, if one of them is defective it will overheat and shut down.
Other possibility is an internal tuner failure. Also test using a DVS or VCR.

Nov 01, 2010 | Philips 27PT543S 27" TV

1 Answer

My tv model 60P8341A philips television screen is red and dull in color what do i need to do?


Hello
If your TV screen looks more red its red video output section is in trouble. Some philips circuts uses transistors while others uses ICs in that section. Philips magnavox model have both types. We here in India, have transistorised video output stages in Philips Magnavox sets. Whatever the ciruit type may be, the fault and its remedy is same.
Check whether your set has transistors or ICs used. If transistors are used, check the collector voltage at red video output transistor. If ICs are used, some sets uses a single IC for Red, Green and Blue output stages. Some of them have three ICs on board as Red,Green and blue output stages.
The video output stages are integrated on the base card of your TV. That is, a small square or rectangular board, pluged into the neck of the picture tube. You just find out the red,green and blue output transistors, or ics whichever may be used. It is ver easy to understand the video output transistors. They may be a little larger than other transistors.
An easy way is to locate the Red,Green and blue cathodes of the picture tube base board points. Check the voltage of the three of them They must be almost equal to each other, provided a little, that is, 2 or 3VDC difference is allowable and will be. In your case, the voltage at the red cathode may be , not may be, must be low. As cathode voltage lowers, emmision of that cathode will rise, and poise that colour is in excess. If the Red Cathode voltage in your TV is found low, say difference betwwen other two cathodes is 50v or so, repace the red output transistor or the Ic if used at that stage. If a single Ic is used in your TV as R_G_B outputs, replce the same. If three Ics are there, replace the red output control Ic. ok
If you have any more problems, inform fixya. They will send me alerts.
Thank you

Oct 20, 2010 | Philips Magnavox 27MS343S 27" TV

1 Answer

I have 37MF321 we replaced the capcitors and everything. However when we put the power into it. We have a Chirping Noise.


Ur high voltage it dead.The FBT is dead,it the Flyback Transformer.The big black block of plastic with a red wire with a cap plug to ur CRT(Tv tube).The "H" Transistor might be dead also.The "H" transistor is to left side steel side wall cage that surounded the FBT.

Mar 15, 2010 | Philips Magnavox 27MS343S 27" TV

2 Answers

My tv just died no power on my protron pltv 3250 power is at the plug in box but tv shows nothing.


Hello Bkobert, hi, before going through the set, kindly check first the following.

1. Check your mains AC line.
2. Check your TV plug cable, they may be loose.
3. Also check if the plug has a user fuse.

If ok, then there is a problem with your TV's switching power supply, a fuse on the board may be open, or loose wiring inside.

The symptoms may go to the extreme, like a faulty switching regulator section, which include the power transistor, IC regulatorm dried up capacitors, and low value resistor.

You may also choose to replace the entire board. thats all. keep me posted

Mar 02, 2010 | Protron PLTV-32 Television

2 Answers

Problems with on/off button


Your Problem is the Hot transistor, it is short circuit. Causing the tv to go into protection. I f you say this is the second time the same problem tell the technician who works on the tv to replace all the caps on the collector of the Transistor and check the lopt transformer causing the HOT transisistor to fail thank you

May 16, 2009 | Philips 20PT91S 20" TV

1 Answer

Dead tv


check first if there's a B+ of your tv which is 95volts , if its ok check the horizontal transistor .

Sep 29, 2008 | Philips Televison & Video

2 Answers

Sharp model 29V- FL250s


ac supply track check this ic ac pals track on resister 240k or470k &diode check this track

Jun 14, 2008 | Sharp 25R-S100 25" TV

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