TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	D5	No focus search function	Unit would not go into focus search mode, thereafter there wasno operation at all. in the process of troubleshooting, i began lookingfor the trouble at ic506 and ic507. there is little in the way oftechnical data relative to waveforms in servicing this
SONY	D5	Defective search and track jump functions	After pushing play button, unit moves to highest track ondisc. unit then plays that track. if mode is then switched to search,unit continuously searches forward.
SONY	SQD2020	Noise in r ch	The unit was making clicking noise in r-ch back output evenwhen the master volume control is minimum.
SONY	CDP101	Clicking popping noise	Clicking and popping noise: replacement of circ decoder solvedproblem. problem was much easier to recognize and confine to a particularblock of the system using test cd #3, particularly track #5 (200hz/tone).
SONY	KV2670R	Set will not shut off with manual, ic-105 memory ic	Unit would not shut off with manual. unit could be turned onby manual. remote would turn on/off the set. we have 4 sets with thisproblem on the west coast area.
SONY	SL2710	One channel low in hi-fi mode	One channel of audio half of the other channel in hifi mode.looking at pin 7 of ic009 p-p amplitude read 1 volt, on pin 1, read 2vp-p.
SONY	TC78C	New transport cracked	New transport not working. -hq comments: the p/n a-2100-258-a is for tc-78c, not for tc-78cii.there are different parts between the new one and the old one. because ofthis when you repair unit, you have to order each part. there is nowhole tape trans
SONY	BMC220	Service manual error	Page 5 fig. 1-4 shows incorrect test points for jig hook-up.
SONY	CFS300	Incorrect pcb marking of transistor leads	B and e leads of q301 are incorrectly marked on bottom ofpcb. diagram of the manual is ok.
SONY	D5	Defective optical block ass'y (fop)	Unit does not play. clicking noise heard. clicking noisecoming from fop lens hitting disc, fop moving too fast.
SONY	CDP101	Noise goes into play mode - oscilation at ic601	1) poping and clicking noises alternating from l/r ch. addedmodification from t/n 0036 - no change 2) upon power up, unit goes intoplay mode. 3) ic601 #7 12vpp at #1 changed ic601/q608/c611/r614 - nochange. changed optical block as last resort - no c
SONY	WMF8	Missing part # for a black lever	A tech needed a black lever. this lever limits the switchlever 332, however, there is no description and the part # in the servicemanual. -hq comments: the part number for the unlisted part is 3-319-038-01.we will issue a t/n and s/b soon.
SONY	CFSF11	Tape transport malfunctions	Head rotation gear is cracked. replacement as per tnla0022/trsb #146 is performed. the transport still jams or hangs up inter-mittently in either forward or reverse play modes. -hq comments: head rotation gear has been updated from plastic to aldie-ca
SONY	TCFX510R	No functions	Various units have come in with functional problems, displayok but no functions.
SONY	KV1946R	Dead, replaced c901	Unit blows fuse f602 whenever power is applied. found capaci-tor c901 shorted.
SONY	KV1943R	No power on, replace c001 and c003	The unit would not turn on.
SONY	BMC110	No p/n for iris motor	No part # for iris motor alone. requires lens disassembly torepair.
SONY	KV20XBR	No color and hue display, replaced ic107	No color and hue display.
SONY	SL2500	Ss-10 board change	Old board (ss-10a, p/n a-6715-131-a) uses pcb part number1-605-574-23. new board uses 1-605-574-32. trick and other functions donot work.
SONY	D5	Play command causes ams to cycle through tracks on disc	Complaint was play command causes ams to cycle through trackson disc till last cut and begin play. preliminary checks showed b+voltages ok. discovered that ff pin 68/ic801 measured 0.6vdc all the timeinstead of 5v. thus mpu was getting ff command all