Help, My Ferguson W7022U TV won't come on. The red standby light is working and the set monentarily comes to life when I use the remote. However during the usual delay that the set takes to check all is well before the CRT fires up, the set switches back to standby and it makes the usual 'plop' in the speakers as it did when normally switching off. Over the two days before completely failing it took to switching itself off and on at random. Can anyone point me to the 'STOCK' faults. Thanks.... Dave
which chassis is this? if you intend to solve this yourself or ask for assistance, you'll need that info. Likely a Thomson. Look for something starting with an ICC or TX on stickers on the rear of the chassis. You will also have to take some measurements and do some basic fault diagnosis- start with the most likely - remove the horizontal transistor and connect a 60-100 w bulb across c-e, see if there is b
+: if so, measure it. chances are the set is protecting itself due to a short, often in the horizontal /line stage or on the vertical/frame output chip - 2 common culprits. Anyway lets not get ahead of ourselves - post results of the tests and we'll take it form there!
Note that there are safety hazards involved , if none of the above makes sense to you then don't play about, take it to a tech. You could screw it up beyond economical repair or kill yourrself if you go poking around!
It's an ICC17 and the red LED on the front is flashing 2 and 7 so 27 which is a deflection fault of some sort. Obviously the STANDBY supply is OK but the set has been coming on momentarily and then going off and no amount of remote button pressing will get it to come on again. So I suspected deflection faults and started faultfinding with my set powered through an isolation transformer. I shorted pin 4 of IP95 to GND and the voltages for U-TIMER, U-SYS, 5VUP,
+UA and U-VIDEO are correct but only for a few seconds then they all go dead, I am now suspecting a SwitchMode fault? Any ideas gratefully recieved.
looks like the line stage. Did you remove the line transistor and check b+? that should be one of the first tests when these problems are suspected. From there check the vertical /frame IC - and before changing it see if its feed resistor is open.
here's a few related stock faults as requested. good luck. B.
ICC17 "ERR27",LOPTX MOD KIT(35175720) ICC17 "ERR27",ZL11 ZL13,FIELD O/P ICC17 3 TRIPS/DEAD LED(FAULT27)(LOPTX1273 SEME KIT). ICC17 CRT BASE SPARKS,LOPTX(HR8317) ADD 470PF2KV ACROSS LOPTR ICC17 DEAD DP21, 39V ZENER ICC17 DEAD "25" FLASHES,LOPTX(KIT) ICC17 DEAD BENT SIDES,TL41(BC241C/TIP41C) ICC17 DEAD CHOPTR(BU2525AX),TP42(B857B SM),TP57,TP58,TP59 ICC17 DEAD CHOPTR,TP44(2SA1020Y),DP42(LL4148) ICC17 DEAD CUST CNTRL PANEL NO 5V TO IR RECIEVER. ICC17 DEAD DP21(39V ZD) LOC121 ICC17 DEAD DP21,39V ZENER ICC17 DEAD ERR 27,FIELD TDA8351,ZL13 ICC17 DEAD FLASH 2/7,RP63(432K) HT VOLTAGE SENSING ICC17 DEAD FLASHING LED SHORT COLLECTOR OF TL71 TO EMITTER,FIELD ZL11 CP ICC17 DEAD FUSE BUH1215 (TP50). PSU REPAIR KIT (CHARLES HYDE -
20104QK) ICC17 DEAD LED FLASHS 2,7 CL25(1UF25V),CL24(360NF),TL41(BC241C/TIP41C) ICC17 DEAD LED FLASHS 2,7 RP63(432K) ICC17 DEAD LOPTX ARCING DON'T USE HR TYPE ICC17 DEAD LOPTX+LOPTR ICC17 DEAD RED LED,2 PULSES 7 PULSES LOPTR,IF01 ZL11 FIELD CHIP ICC17 DEAD ZL13,TDA8351 ICC17 DEAD,DP06(BZW04-342) ACROSS BRIDGE RECT ICC17 DEAD/STBY LOPTR(BUH516) ICC17 DISABLE TRIP SHORT ACROSS C/E OF TL17 ICC17 DISABLE TRIP SHORT COLLECTOR TL71(SM) TO EARTH, LOC41 ICC17 DISABLE TRP BY TL71(C TO CHASSIS) NR CREEN CAN UNDER PCB
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