thomson Repair Tips

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Make	Model Ch.	Symptom	Problem Solution
Thomson	24WK24U ICC17	Set is tripping with flashing from the red standby light	Short the collector of TL71 to earth, if the set comes on you will find the frame chip is blown and ZL11 cp is o/c. If the set still wont come on them the LOPT is suspect
Thomson	TX91	PLL will not lock for all frequencies keeps running during program search, on screen display moving / unstable	Changed the tuner and the STV8224 also check transistor at location TV02 is ok
Thomson	28WR23EG ICC17	AV1, AV2 are fine but AV3 do not work. Picture may be ok but no sound	Replace BA7604N, and check CX64 47pF
Thomson	ICC17	Standby led fault codes and meanings list / standby led flashes then pauses	Code meanings are as follows: 10 = child lock mode, 11 = timer mode, 14 = there is no response from Iv01, 15 = there is no response from IS40, 20 = bus access prohibited by software, 21 = bus data line held low, 23 = bus clock line held low, 25 = switched 5v supply missing, 26 = crt is not warming in the allotted time, 27 = deflection failure more than three times, 28 = IF01 guard voltage pin 8 exceeded, 34 = no response from the nvm chip IR03, 36 = incorrect address passed to bus handler, 37 = unexpected level on NMI line power fail, 41 = bus data line not recoverable
Thomson	28WS23E ICC17	Set trips off int. Set tries to come on then goes back to standby	Dry joints on line o/p transformer
Thomson	ICC20	Set tries to start three times, HV comes up for a short moment. After this LED is blinking first four times, then seven times	Change vertical chip TDA8177F and the four diodes in front of it
Thomson	TX807	EHT at switch on then goes dead	Frame i.c. s/c TDA8177
Thomson	28WS23E ICC17	At switch on set starts-up with lots of sparks inside CRT socket, then switches to standby	Replace FBT - HR 8317. There is a repair kit available from Thompson for this , which includes a new loptx, tuning caps and a couple of coils. There are also some surface mount resistor value changes. It's Pt. no: 35175720
Thomson	24WK25US ICC17	No/Low contrast after EHT flashover	Check/replace TL02 and TL59 in the beam limiter circuit
Thomson	TX807	Plain raster, retrace lines, no sound	Problem in vif board, Resistor 68 ohms to +b supply line 12V
Thomson	28VK-44E	No start-up when cold, warm OK	Changes CP198 47uF, 16v. Secondary Power supply
Thomson	RP46	East-west and north-south bowing. Really bad convergence	The extra power supply is not working. Check R18 on primary side. It should read 220Kohm
Thomson	ICC17	Picture lacking in contrast and brightness	The symptoms suggested a beam limiter fault, replacing transistor TL02 BF422 which was found to be leaky produced excellent pictures
Thomson Ferguson	14CB25UT C3615UT	No pic - sound ok but reverts to st/by aft 5-10secs	DL07-BY228 in e/w stage
Thomson	W7023U ICC17	Dead with front LED blinking 2 then 7 times	In prot mode - brown gunge around LOPTx. Fit replacement (comes a s a kit) pt no 35123670
Thomson	W7023U	Trips with brief line coll after LOPTx replaced	FOP chip & ZL11 cp o/c - looks like a brown cap
Thomson	TX92F	LED flashing at sw on (prot mode)	disable pin 4 of IP 70 IC TDA8139 to over-ride prot cct - shows field coll; IC STV2145 (IF02) was faulty, but still no functs - replaced EEPROM - now bad col with green flashes - jungle chip faulty
Thomson	TX92 28DT73H	Reverts to st/by aft few mins	Dry joints pins 1 & 2 LOPTx
Thomson	TX91	No sound aft dropped	RA08 22k sm res dislodged;
Thomson	TX90 Chassis	Int. White raster with flyback lines visible, or switches off. Seems as if there is a cold solder joint.	Replace TDA8218 chip. It has occured many times with these ST made chips.