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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: 10
LG
CF25A50F
Field mod when FOPTr has blown
Fit TDA8350Q & use heatsink compound as well as the grey thermal transfer pad between the chip & the heatsink. Change C352 to 22mfd (was 47mfd) 50 volts Change C708 to 22mfd (was 47mfd) 100volts . This is located to the left of the LOPT on the 45 volts rail. Change FR359 to 22ohms half watt fuse resistor (was 10 ohms) This is also located to the left of the LOPT on the 45 volts. rail. Add a 0.01 mfd cap on pins 8 & 9 of the frame chip & 0.1mfd between pins 7 & 8 (both 100volts)
14-09-04
LG
CF25A50F
Reverts to st/by aft 2-3 secs, HT drops to 60v
IC351 FOP chip TDA8350Q & FR350 10R fusible
14-09-04
LG
CF28C22F etc
Field collapse
Fit mod kit KITPC33J (7 parts inc)
14-09-04
LG
CI14B50F 11.1
St/by only - no line dr
No 12v supply to line dr trfmr Tr101. Check back from pin 15 chopper trfmr - R410 0R1 o/c & dry joints chopper trfmr
14-09-04
LG
CI20E20
Dead with STRS5707 chopper chip & bridge rect s/c
Also replace 4 x elects in psu
14-09-04
LG
CI21T24F
St/by only - red LED lit no power to psu pri
Dry joints RL108 relay
14-09-04
LG
KE14U73
St/by only
HT present but no 8v supply to IC500 jungle chip pin 37. D850 in psu leaky
14-09-04
LG
KE14U73 Combi
Swirling lines & static pops on pic
poor earthing of the deck to the screen large VCR screening can
14-09-04
LG
LV710
Wont tune - "SAFE" displayed
Sus EEPROM
14-09-04
LG
Various
Modifying R/C to access service modes
There is a service remote availiable but if you have a remote which uses an SAA3010T IC , simply connect a tact switch between pins 1 & 11 to access the service mode .
14-09-04
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