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Electronic appliance repair tips database - TV (LCD,TFT,Plasma,Digital), Monitor, VCR, DVD recorder and player, Digital camera, Audio equipment, Microwave ovens, Phone systems, Computer repair
Make
Model
Problem
Solution
Date
Found: 19
Hitachi
A7
Dead - overvolts Zener PGK180 s/c
Check dry joints HT pot RV950, R950 68k, R952 8k2 & opto IC901 Pt no T548013 -see write up from Dave Hewitt
14-09-04
Hitachi
A7 C24W1TN
Trips
Does it trip with A1 volts at min/max? If not, check Nicam chip is fully home in its holder
14-09-04
Hitachi
A7 series
Field collapse or cramp
Check IC601 & if R616 68k is fitted, if not connect across ZD603 - helps prevent crt flashover damage
14-09-04
Hitachi
A7 series
Int reverts to st/by - due to high HT of 175v (135v)
Check for dry joints (often invisible) on Set HT pot VR950
14-09-04
Hitachi
A7 series
Short pic
Check value of R602 or 603 (1R - 2R2), they can increase in value slightly
14-09-04
Hitachi
C2886TN A7
Pic takes long time to appear
Change R896,R897 & R898 from 150R TO 220R & set A1 to 147v at green Tr cath
14-09-04
Hitachi
C2886TN A7
Sound - int crackle
Resolder caps around sound o/p IC - build up of residue on legs
14-09-04
Hitachi
C2886TN A7
St/by only but LED dim as though working (TDA8375 version)
DJ on the ground link which is located between small caps C528, C529 near the 2 X-tals X501, X502. The DJ was on the component side of the PCB.
14-09-04
Hitachi
C2886TN A7
When changing LOPTxs
Pay attention to type of replacement transformer; if not identical you may need to change links (see Serge)
14-09-04
Hitachi
C28W1TN A7
Excess height - unable to enter serv mode
Can be altered using EEPROM programmer - address 171H is the location
14-09-04
Hitachi
C28W1TN A7
Service mode entering
Set to Chan 44 & press "Status" button(I or +) then mute & TV
14-09-04
Hitachi
C32W510SN A7
Cuts out int
Check earth links & reg heatsinks for dry joints
14-09-04
Hitachi
C32W510SN A7
Field faulty - jittery & lines below centre - tappable
Dry joints R602 & 3 connected to pin 5 IC601 (under glue & a plastic strut)
14-09-04
Hitachi
C32WD2TN2 A7
Tripping
Check R807/8/9 on crt for burn up - if so CRT is duff (Philips) & crt base reqs replacement pt no A527110
14-09-04
Philips
MD1.1A 29PT886A/79R
Dead with burning smell
Cap 2428 330nF 250v conn arcing
14-09-04
Rowa
71RA 7102
Relay won't kick in
C516 47µ
14-09-04
Samsung
CW30A75S
St/by only with LED flashing
R423 overheats - DZ302 33v zener & IC301 TDA8351
14-09-04
Watson
FA7039 11AK19
Dead with LOPTr s/c
HT at 170v on dummy load - R823 130k hi at 170k
14-09-04
Watson
FA7039 11AK19
Width excessive & no E/W adj
L602 loading coil to left of LOPTx dry jointed legs - remove & scrape clean
14-09-04
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