Mulja tv repair portal
Equipment Repairs => CRT TV forum => Topic started by: buffy on November 29, 2008,12:35:25
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:ciao: Hi...
Got one of these in, problem..... Switch on you get green led, red led, green led, red, etc..... tripping?? inspection of board - nothing jumping out, no burning.... cant SEE any dry joints, but there again i am very old nowadays :laugh1: eyesight gone :loool: Come on GUYS you must have had this one its a crappy old Vestel!!! :wallbash:
carol
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Hi Carol, check the diode that supplies the 150v for the line output stage it may be s/c,can't remember the circuit ref,also any other feed diodes in the power supply. Line output transistor worth checking also diodes around line output stage. Hope this helps,Norman
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Norman,
The diode (D112) reads high one way lower the other!! i think that meant it was OK?? Its been a long while since i got my C&G, forgotten a lot!!! work in a shop these days :blush: checked the diodes in the LOPT area - all 'seem' OK :dry: oh well, another one for the tip :sad:
carol
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Hi carol,
You need to establish if your power supply is working, have you got HT?
If you suspect power supply then IC106 MC44608 is known to fail.check R130 for drys.Check R152 O/C
If PSU ok then I would check LT feed resistors to Field stage they are usually 0.22 or 0.47 ohm
if they have failed then your Field IC may have failed.
I assume you have checked the Line output transistor for S/C
Failing this I think you need to do some voltage checks to narrow down the causes.
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Brainstorm....
Checked around, it appears that HT 200V is present, etc... but low voltage to the EEprom etc, is not comes up as 10V on the Reg, then drops to 2V - so... LV Fault i suspect, i wonder if the EEPROM is faulty??? cant see any drys anywhere, but i dont have good light and i am old and blind these days!!! :chok: :blush:
carol
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As it appears to be something i cant 'see' i assume its a chip or MOSFET, CHS do a PSU repair kit, maybe i will keep the set and fit that sometime in the future :mellow: Still a goody i think :unknw:
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If you have 200v to tube then most is working??
EEPROM has been known to be trouble AK45. Pop in a blank one and see what happens. Options will be wrong but will prove the point.
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I dont have a blank EEPROM, or any way of programing one etc..... i took it out completely and the fault remains. :dry: anyway i will unemployed after xmas, so no chance of doing anything about anything!!!