Question about Orion1934 19" TV

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Give me ic regulator code

My tv still no power the fuse is ok the secondary line capacitor is no power.

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I would need model number of tv set .do you need part number?



Thanks jay DOCTOR VIDEO

Posted on Apr 25, 2008

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I have sharp tv model 20v-r70m not power on the b+ is ok i try test 9v supply go to ic801 drop the 9v,then i try replace ic801 nothing happen, how to fix this


pls. check if there has 5v ic regulator... also check the open non- electrolytic colored yellow or orange tantallum capacitor near the talc switches and memory ic.if i'm not mistaken.... the capacitor value is 2.2uf 50v.

Jul 14, 2014 | Sharp Televison & Video

1 Answer

My hitachi plasma 42 PD7800TA does not turn on ,not even the standby ,the fuse is fine ,dont know what else to do? thanks Tony.


Hello
The power regulator board in your Hitachi is not switching. It is an SMPS [Switched Mode Power Supply]. Normally for plasma TVs the power supply repair will be almost impossibele due to lack of component availability. If the fuse is OK, definitley the switching process has failed it it. There is an IC which oscillates at high frequency, whic its oscillation signals are given to MOSFET transistors to chop the incoming AC, converted DC voltage. These switched voltage is passed through SMPS transofrmers which it turn generates secondary voltages that goes to different circuit boards of your TV. The power board is the most important section in a Plasma TV. it must be perfect in every respect in terms of secondary voltages. If any one of this voltage goes over than specified, the main boar will get damaged. So it is adviced to replace it as card basis, rather than making "sugery" to it. The power supply board can be had from Authorised Hitachi Service centers. You just give the the exact model number of your Hitachi TV. They will give you the orginal power supply board. Never play experiments with Plasma TV. OK.

Jul 15, 2011 | Hitachi PlasmaSync CMP4202U 42 in. HDTV...

1 Answer

Model 27LCDB03B-simply appears to be "dead" won't power up-not the fuse


Hello Chris, Hi, your TV's power supply section is not functioning properly. If the fuse is in good shape, then the auxiliary power section of the power supply is not functioning, this section powers the switching oscillator and IC that sends the pulse to the switching element like power transistors to create a main secondary voltage. the main secondary voltage is the circuit that produces all voltage needed source by the TV. what you can do if you are up to it.
A. Visualize any bulging capacitors, replace them. B. Measure the voltage across the following section in particular order so we can find the faulty parts.
  1. the AC input on the Power supply board. (none means open switch or power cable)
  2. the AC after the line filter circuit. (none means open line filter)
  3. the DC on the filter capacitor. (none means problem on the rectifier)
  4. then the AC on the switching element or input on the main transformer. (most likely you won't have any voltage reading hear.)if you do have continue.... (none means you scratch your head, this is the hardest part) check all low value resistors, high wattage resistors open or shorted diodes.
  5. the dc on the secondary filter capacitors.
If not have this checked by a technician, its to complicated for you.

Mar 12, 2011 | Thomson 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

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

I am having an issue with a 42 inch vizio plasma Power Supply


Ahem, forgive me for being upfront...I am trying to help you, not to offend you, so bear that in mind.

Your language is quite non-technical and would be easy to follow; respectively it would be hard for you to follow instructions before first getting some education about diodes, capacitors, rectifiers etc.

And given the apparent lack of experience servicing electronics on your end I would suggest that possibly the easiest way to get your TV up and running is to buy a new power board.

I was thinking of offering you to send me yours for service, but considering you can get a working one on eBay for $70 delivered I don't think it's worth the attempt.

Once you get a working board you can start comparing the two with an ohm-metter and see if you can find which component is faulty.

I am not saying that;'s the best way to do it, of course, but if you want to spend time learning things it's a good way to start.

May 14, 2010 | Vizio P2 42 in. HD-Ready Plasma Television

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

1 Answer

EMERSON TV MODEL EWT2721


unplug your tv and check the volts in primary capacitor .if it will not discharge the regulator IC is bad .



Oct 10, 2008 | Televison & Video

1 Answer

Blown 4 amp fuse twice


ok appaloosa! is the fuse blowned again? if blow you have fault unregulated power section, you have defective parts like.. leak degausing or defective diodes or capacitor and or regulator IC. 2nd. defective horizontal output. if not blow the fuse u have fault oscillation!

Sep 14, 2007 | Pioneer SD-P55A3-K 55" Rear Projection...

3 Answers

STRS6707 problem


In the past, my experience with Sonys is that you need to use Sony parts to successfully repair them. Also you might have a cold solder joint which creates an arc when you turn it on. This arc will cause a "spike" which could possibly take out the regulator. Stargazer

Jan 15, 2007 | Sharp 32F540 32" TV

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