Forum > CRT TV forum

SHARP 28LW92H - VESTEL 11AK45

(1/2) > >>

buffy:
 :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

norman:
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

buffy:
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

brainstorm:
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.

buffy:
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

Navigation

[0] Message Index

[#] Next page