Question about Panasonic CT-32HXC43 32" TV

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Main power supply

The main regulator power supply cannot provide B+, i already changed the regulator IC

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If you changed the regulator and it still doesn't put out B+ you must have an open circuit somewhere. That model is known to have a 6.3 amp B+ fuse that opens and you must check it with an ohmmeter to tell if it's bad. replace it with a 7 amp fuse and you should be ok. If that doesn't solve it you may consider taking it to a shop. By the way, you're welcome for the tip. Two out of a hundred people said thanks for my time. Russmann

Posted on Dec 08, 2008

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Why does my Bush BLCD37 HDA8 keep turning itself off and the on again. It seems to only happen at home. I have sent it to a TV repair man who could not get the telly to replicate the problem, so he...


Check its main power supply regulator's output voltages. If main supply output from it is more than normal, this kind of fault can occur. [Over-voltage / Under-voltage] problem. The main system control IC in the TV will detect this condition, and will shut the TV Off. The best practice is to replace all the electrolytic capacitors at the main power supply regulator board.

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Hello
This is due to over voltage. Not related to supply in overvoltage, but the overvoltage that goes to the main board to this TV. Most TVs works oan a range of 85 to 120VDC. This voltage is generated from the internal power regulator. If the power regulator have any fault, the supplied voltage to the main board may either high or low. In both cases, the main system control IC on board, will detect it and will give you this symptoms.
The work is a skilled one, and only an expereinces service technician can make it right.

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check for bad voltage regulator ic. Check for 160v across your main cap and power supply. Use floating ground, to see if power supply is working. If you have 160v, check for 130v b+ to see if your horizontal circuit is working.

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Tv is going into x-ray protection mode. Check power supply voltage, make sure it's not too high. 160v dc across main cap, do not use chassis ground, use cap ground. If too high, something is open. If too low, something is shorted in power supply. Check voltage regulator ic.

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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.

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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

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1 Answer

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1 Answer

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Hi

please try to check the board at the Jungle Chroma section, check the supply voltages tru Jungle IC then check the Regulator of Jungle power supply if this is 5, 8. or 12Volts. please check. if the requirements is same by the given regulator viltages.

Thanks!

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1 Answer

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check Vertical IC out (LA78..) and resistor voltage supply from flyback transformer to this ic. Check the STR main power supply(and resistor near, change value), some times seems good out main board,but in operation not good

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