TV repair tips and reviews,tutorials ebooks and tools

I was working on this panel and as I am about programming some tv stations on it I detect that it fails to pick any stations.I replace the tv tuner though the tuning and supply voltage were present but its still the same.Noting well that the memory ic (eeprom) of most of this present tv boards contributes a lot to their operation so I changed the eeprom ic.I search for the tv stations again and they were perfectly programmed.The eeprom is 24CO8 and it is faulty component on the board.

crt television fault repair , eeprom ic related fault

Tuning problem linked to eeprom ic

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The tv is a jvc model,it suddenly switches off when in use but brought out a plain raster afterward.

After battling with it for quite sometime without good result i decide to take some voltage readings.200v supply to tube base from flyback transformer was around 57v which is wrong and an indication of fault along that line,so i need to trace the fault from that line to detect what the fault is.

from the picture above diode D553 and the fuse resistor R554 tested good , the capacitor C557 is of the value 250v2.2uf but reads 0.57uf when measured by my esr meter.I replace it 250v10uf and the fault was cleared completely and the tv brought back to life again.

crt television fault repair

Jvc Television with Plain Raster Repaired

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The tv displayed as shown in the picture above.Normally the major suspect for this type of fault is the vertical ic.it uses tda3563B as the vertical ic,vcc supplied to this ic is 27v which is correct and i decide to change the ic.I was suprised to see the tv display the same horizontal line on screen of the tv that means the fault is not with the vertical ic so i need to troubleshoot further.Fortunately i have the same model of this tv in my workshop and it is working perfectly.i start to compare the two panels and i detect that pin 3 of the vertical ic(tda3653b) is the vertical drive which feeds directly from the oscillator ic tda8361 and around 2.4v on the working panel and 0.55v on the faulty panel.I change the oscillator ic and the fault was gone.The tv now works perfectly.

crt television fault repair , electronics component tips

can TDA8361 be the cause of this fault

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The tv display is as shown in the picture,and faults that normally has to do with the screen display is always on the video board at the tube base.Direct replace the three drive transistors but the fault was still there but later detected that a 12k resistor was bad.Replacing the resistor corrected the fault and the tv brought out its normal colour.

crt television fault repair

Red colour with retrace lines on screen of tv

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The lg home theatre got damaged from excessive voltage.what I cherished about this dvd is that it uses a varistor as surge protector at the power supply and instead of creating serious damage to the power supply this varistor protect the circuit by shorting itself and break the fuse.I am always confident when this type of fault is brought to my workshop for repair.In the case of the one above I just change the burnt varistor and the fuse and it starts functioning again.

dvd player repair , home theatres

LG Home theatre dvd repaired

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I came across this chart on the web and it is worth sharing.It simplified resistor colour coding and also the common 5 colour band resistor can be easily understood through this chart. If you are finding it difficult to understand the chart,you can post your question in the comment so i will explain it better.

electronics component tips

Resistor Colour Coding

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This is a method on how to solve the issue of sound through menu settings in this flatron televisions:
First of all check if speakers are not faulty otherwise you will need to changed it since bad speakers are some of the reasons why tv maybe having sound problem,but if the speakers test good then you can continue with this process.
Goto menu
scroll down to sound
Goto AVL; if avl is set at "ON",there will not be sound output from the speaker ,so turn AVL to "off" and sound will come up again.

crt television fault repair

LG Flatron with no sound problem solved

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The tv is a 21inch lg flatron tv and the fault was that when you switch it on,you will be hearing the sound but there is no trace of any picture on the screen,in short the tube is not working at all.
     OBSERVATION
    The filament light at the tube base is coming up but the screen grid voltage is 0.I detach the video board from the tube base of the crt,powered the tv and the sreen voltage was now 230v,so definitely the crt is shorted.How do I know these?I connect the video board to the tube base again , took another voltage reading and it gives a 0volt and it is only when there is a short that such fault occur.
     HOW I CLEAR THE CRT SHORT
I took a 47uf 250v capacitor,soldered a meter probe to the positive terminal of the capacitor.I soldered the negative terminal to GND on the video board.What I want to do is to charge up the capacitor.The green,red and blue cathode on the video board had their normal voltages.I placed the probe on the red cathode terminal on board for about 3secs and immediately removed it to place it on the G2 terminal on video board.It made a spark and instantly the shorts clear away and the picture came out fine.It really works like magic.
     CONCLUSION
   When the crt was still shorted the ohms reading between G1 and G2 was around 5k but after clearing the short the reading was at infinity.You can repeat the process if it fails the first time.Please comment in the box for any question on this fault or if you know of any other method to clear a crt short.

crt television fault repair

How to clear crt short in LG Flatron tv

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The repair tip is from kent liew on how a lcd monitor shuts down after two hours was repaired and it is to see what the fault was,a lot of monitors had been converted to scrap because of this fault.Learn how to tackle this type of fault herehttp://www.lcd-television-repair.com/newsletter/lcd_monitor_randomly_no_display_no_power.html

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This LG dvd(china made) fail to play when you load disc in it and instead gives out the "no disc" error message.Some of the causes of

this fault includes :

1.bad optical lens

2.spinning motor

3.bad dvd flex

4.faulty video board

But in this dvd the major suspect is the optical lens.Looking closely at the lens I find it dificult to believe that it is bad so i decide to check probably i can find something to do to it to make it work again.Checking through the Iens I saw a tiny foamlike particle in between the lens and blew it off and just test to see maybe it will work and believe me it works perfectly.Its my first time of encountering this type of fault and any other time i will be checking for this dirts.

dvd player repair

Dvd Player with ''no disc'' error message repaired

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