Question about Sanyo DS27510 27" TV

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Question about the voltages.

I tested the voltage with the collector of the high output transistor disconnected, I have 161 volts from ground to the center lead of the voltage regulator, and 57 volts to collector of the H.O.T, with respect to ground, whether power is on or off.

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Re: Question about the voltages.

I have read your two previous questions on this TV. I am not sure what your original problem was. Is the High Output Transistor the same as the Line Output Transistor? 161 volts sounds correct for USA. Is the HOT Emitter/Base at ground potential, if so then you do not have a dud line output transistor, otherwise it would not sustain 57 volts.

Posted on Oct 22, 2006

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Re: Question about the voltages. - Sanyo DS27510 27" TV Standard (CRT) Televisions

What is the question please?

Posted on Oct 20, 2006

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1 Answer

Horizontal output to screen

It comes from the case or collector of the output transistor and goes to the high voltage transformer which provides high voltage to the picture tube.

What do you need to know?

May 28, 2012 | Sharp Standard (CRT) Televisions

1 Answer

While testing vdc at the base board for the cathode wires found that the red and blue were at 4 VDC and green was at 8. Picture has mainly blue and green tints.No loose soldier joints found.

Have you measured the voltages at the collectors of the three video output transistors?. There must be a voltage over 124 to140VDC at least. All voltages at the base of that transistors should be between 2.5 to 3.75VDC according to the level of chroma signal from the chroma Ic.
You must check these voltages with a good quality digital or analogue multimeters, otherwise you will get only false values instead of the real. You just check the main voltage that goes to the video output stage, that is the high voltage comes to the crt base, from the main board. It should be more than 260VDC. Normally in all tvs this voltage is derived from the LOT. After rectifying it and filtered with a 10Mfd 350V capacitor, and given to the baseboard as the main supply to video output stage. If the smoothing capacitor [10Mfd] gets value changed, that is if it gets a low value due to age, otherwise whether it has an internal short, you won't get the above said 260VDC at the CRT base boad. At first locate this capacitor and replace it with a new one with same capacity and voltage ratings. and check all video output [ 3 of them] transitors too. Check the transistors for collector to emitter leak, not on circuit, but after take it out desoldered. Then only you will get the proper measurement of leak. Set the multimeter in MegOhms rage, and don't held the transistor by hand too. If you do so you will see some deflection in the meter due to your body resistance.
Check the capacitor first. Replace it. It is best. Check the rectifying diode that rectifies this voltage from the LOT winding. If it has a leak, you will get a low voltage at this rail.
Remember, LOT works at high frequecy. So the diode used there as retifier is a special type, fast recovery diode, and should be repaced with the same number. Never use ordinary diodes that we uses for line rectification purpose.
Remember, colector voltages at the video output transistors must be above 140VDC. Again recomends to use a good quality multimeter, as cheaper one cannot measure this voltage accurately.
Ok. Wish you all sucess.

Oct 23, 2010 | Proscan PS36125 36" TV

1 Answer

If the voltage in h out is 200v is good or bad and the voltage regular is heat?

You mean the collector voltage on the Horz output transistor is 200 volts?

I would check this by removing the transistor and then measuring the voltage on the board (where the collector or center leg of the transistor is soldered to).

I don't know what kind of tv this is but you should see 130v or 135 volts.
RCA sets you should see 140v. If the voltage is too high replace the voltage regulator.

Mar 09, 2010 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

No picture with sound

no high voltage. most problem is possible shorted horizontal output transistor. check collector of transistor. should be 135 volts dc. if not.... power supply or fuse.

Nov 13, 2009 | Standard (CRT) Televisions

1 Answer



ang voltage ng HOT 90 to 120 Volts. kapag standby power yan ay 90 volts japag nag oscillate ang HOT power yan ay tataas ng 120volts Psi. Technician kaba?


Sep 25, 2008 | Standard (CRT) Televisions

2 Answers

Television not working

Hello mo4uc,

Check to see if the Horizontal Output Transistors (HOT) collector lead is shorted to ground, this can be done by taking an ohmmeter reading between the collector and ground. If the transistor is shorted, that could be one of your problems, the other problem could be a defective IHVT (Integrated High Voltage Transformer). You will need to do a ring test to see if the IHVT is good.

I hope this helps

Thank you,


Aug 04, 2008 | Orion1934 19" TV

1 Answer

Turns on light comes on but no sound and no picture

verify your b+ voltage on collector of horizontal output transistor 7405 and if 130 volts is missing or way off go to power supply circuit and verify voltage on pin 14 of ic 7511 and if there is not approx 150 volts present should replace that ic and startup capacitor 2511 and opto isolator 7513. if 130 volts is present on collector of 7405 then scope signal on 7404 and if not clean signal replace micro processor

May 27, 2008 | Philips 26PW6341 26" TV

1 Answer

Tv repair

you can try to check if the problem is near flyback transformer
you ha to disconnect the power cord , open tv and locate power
transistor for generate high voltage it is near the big four connector 
cable the transistore you have to dissolder from board and check
with multimeter if it is shorted or not in this way base to collector
junction about 500 or more base emitter the same  collector to emittor open - delfo

Mar 21, 2008 | Standard (CRT) Televisions

1 Answer

T.v. was hit by lightning and wont turn on

Check Q605 for short. Hope this helps

Nov 20, 2006 | Sanyo DS27510 27" TV

2 Answers

T.V. wont turn on

The voltage might be low because is being loaded down,open the collector of the output transistor and measure the voltage again,if it goes up to 130 or the voltage is suppose to have you might be looking at a bad output transformer(flyback)there are other parts that can cause the loaded down voltage,the yoke can be one and capacitors in the deflection circuit,check to see if one of this caps is overheated (bubble)or cook,Be carefull if you open the collector when you measure the voltage,If you can try measuring the voltage somewhere else.Lets Us know if you need meore help.

Oct 09, 2006 | Sanyo DS27510 27" TV

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