The tv show a wavy kind of picture on screen and only red colour.when its on channel the display will be flickering and unstable. I opened it up and resolder some dry joints and detect this bulged capacitor of 100v47uf
After replacing with another one of same value I test the tv and it works. The next day the owner brought it back again that the problem still persist. I start to troubleshoot and detect that the 160v100uf filter capacitor is also bad. I changed again and this time the tv works perfectly
Panasonic TV: horizontal output transistor blows off frequently
The TV is an old model CRT tv and when tested it makes a hissing sound,initially I thought the flyback transformer is bad but when I checked the output transistor I detect its faulty.I replaced it but about 10s of powering the tv on this transistor got burnt again.I test the voltage at the output transistor collector terminal and it was over 220v instead of 130v.When such situation occurs it is adviceable to check the power supply circuit and from my troubleshooting I detect this 50v47uf capacitor to be defective
I changed it along with the output transistor and the tv works perfectly when tested.
The TV is a China made LG tv and are common here in my country. People buy this TV because it is brand new and very cheap compare to buying the original type.
One of the fault common with this tv is showing only red colour on the screen as shown in the picture
The stage to quickly go to is the video amplifier board at the tube base replace the drive transistors along with the drive resistors if need be. Instantly the fault will clear away.
The fault is not all that common in Lg TV but from my repair experience I suspect the vertical ic
I went straight to this ic and replaced it and guess what! I was correct. This is the ic below
When powered it starts but goes back to standby mode. When it is in standby mode the voltage at horizontal is 120v and other output voltages are of the right values. I changed the flyback transformer,tea2261 power ic but all to no avail. I decided checking capacitors at output with my digital meter and came across this cap 160v 100uf with an ESR of 16 but suppose to be within range of close to 100 or a bit above it.
I replaced it and this is the TV working perfectly.