Top 20 Sony FD Trinitron WEGA KV-30HS420 30" TV Questions & Answers

Check your board on power supply if you can find broken tracks.I might cause the problem

Check and replace its main system control memory IC. It is not working properly. Check and replace damaged component/s at it main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts. Do a search by type in the brand name of your device at its search box. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis.

Just reset the TV to its factory settings and check. To do this you have to enter its service mode option. How to enter the service mode option is described in one among the posts at the site linked here. But, before doing this reset, just connect the HDMI cable to the TV, and input an HDMI signal to it. If there is no input signal, the set will display as 'no input'. Check this first. If you wish to get further assistance from me, come over by FiXya comment. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. http://electronicshelponline.blogspot.com/

These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit stage inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power led, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating, to many popular brand TVs and other devices. Viewing it in "Mosaic" will make surf easy. http://electronicshelponline.blogspot.com/ Blinking codes details to many popular brand TVs are given. Gopakumar Gopalan Google

Main board fault. IIC Bus line has a short. Continious blinks of standby light denotes this. These are called blinking codes.If you wish to get more details, surf the following link. There are over two thousand and four hundred posts. All are related to television and other domestic electronic equipment service help. You can get a solution there. More than Nine Lakh viewers cannot be wrong. http://electronicshelponline.blogspot.com/

Blinking of standby light are fault indications. How many times the standby light blinks at a time. Count it, and inform me.

Visit this site for details. All information about this type of fault [2 blinks of standby light to sony Trinitron]; are described here in detail."Electro-help", is the name of the site.Search for it on Google.

Three blinks - B+ over voltage protection (OVP), unit goes to the standby mode then displays the 3 blink fault. This is also a problem in the power supply circuit, check T603 and R672

Four blinks - No vertical Deflection (V STOP), Screen goes to a single horizontal line then the video signal muted. Check IC1509, Q1505

Cable direct to coax fitting on rear of set, in menu set to CATV/cable, and auto program---any channels it misses or you do not want you can in same menu manually add or delete one at a time with the sets remote.

There's a resolution/aspect ratio you can adjust in the picture menu, or straight from the remote. Choose the size you want on ESPN that best fits the picture while watching it.

Hi
Get the set to reset fist and see whether it helps you. To reset it do the folloing:
1 Press POWER to turn on the TV
2 Hold down RESET on the remote control.

3 Press TV POWER on the TV. (The TV will turn itself off, then back
on.)
4 Release RESET.
If this process does not solve the proble of your TV, its memory IC has damaged. Memory IC is one which holds the data we enter to the TV set, and the processed is stored. It is a nn volatile memory [the memory stored in it won't get lost even power is switeced OFF]; which holds all the data in. The data stored in it will retrive to main system processing IC each time we switch ON the TV set. This is an eight terminal IC, very samll one indeed, can be located very near to the main system control IC, at system control section. It can be repalced. This IC can be bought from most of the electronic spare part shops at your town. It is very cheap to buy. Even though it is very small and cheap one, its function in TV circuit is great. Almost all the functions data is stored in it each time we operate the system. It will have a specific number printed on it, and should be noted when buy a new one. Insist on that number, substitutions or an other number won't even switch ON your TV. OK.

There's a bad MCZ ic. It's got 10-12 legs. There are 2 of them. It's the one located closest to the back of the T.V. You can heat your T.V. up to get it working again using a blow drier until you can get it repaired.

There is a power supply fault causing the EHT to rise above 33KV.

High voltage shutdown. The high voltage has exceeded 33k and the unit goes immediately into safety shutdown. Check power supply regulation and horizontal circuits.
Hope that points the engineer in the right direction.

Check all fuses, if you replace fuse and it blows immediately then the two main culprits are power supply semiconductors and line output stage. even if fuses are not blown those are the two areas I would look at
Check for dry joints around the line output transformer also. That is a common fault.
I hope I have been of help but please do not hesitate to ask if you have any further questions.
I appreciate your vote if you appreciate my reply.

the KV-30HS420 model is a CRT based set and thus has no "lamp". What is hte proble with the set?

Dan

hello, you should press the display button
at the remote control that marked with the i letter or with the ? sign . good luck!

Either your power supply is bad and needs replaced, or their is other circuitry issues. Bets to have a trained technician look at this and give you a quote for repair, it might be cheaper in the long run to replace the set.

whats problem?