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It might be the power supply is going bad or that the picture tube is needing to be replaced and is starting to not work anymore. Or cascade failure were several parts don't work anymore for the power supply inside of the TV unit.
Check the continuity of the CRT heater [pin 1~8]. If it is found open, no need to proceed. If it has continuity, check the AC voltage there when the LOT works. Should have about 6.2VAC. If not, check all the solder terminals and series resisotr. connected to this bus. Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
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first of all you have to check the power supply. sometimes bad electrolytic capacitors on the power supply can lead to such problems. may the capacitors seems ok visually but not be good in performance. if power supply is ok then you have to go for a ne inverter board. check the video to understand how to check the power supply of lcd tv
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electro-medical.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent Testing LCD TV Power Supply BoardsSTEP BY STEP
try this,hang the collector pin of the HOT then try to switch on check the voltage its 115v dc,and check also the oscillation drive at the base of HOT take your VOM at 10v ac,ther must be a flactuate at the pointer.if the two procedure are good.plyback is deffective.but if u dont have any measured voltage at the collector of HOT ur problem is in the power supply. mc44608 is use at all old model philips tv.email me for wat happend