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It is the TPA3251.

269 usd on https://www.aliexpress.com/item/1005005787838746.html

Firstly , unscrew the front panel then detached the vu meter cable off. There is 4 smd 5532 op amp. It is very tiny so I think it is unreplacable with Starkos. I do replace the 5 Samxon 820uf/50v capacitor with Elna silmic2 100uf/63v which fit in perfectly but 8 times less than the Samxon and...

Beside all criticm , it sounds silky smooth and very clean. The down side is it's low power output. So the company positioning for this product is clearly for high sensitivity speakers.

Bottom view

Two black rectangular boxes seem to be advertised Topping secret.

All wiring are ordinary cables not OFC or branded audio cables.

Nichicon FW appears to be the lowest on the audio series from Nichicon but it sounds good.

Topping LA90D internal/tear down pictures. 1)It appears that all Topping product tear down need this 9 inches 2 mm hex keys. 2)Reservoir cap are 4 Nichicon FW 4700uf 35v. 3)Input cap are 4 Nichicon FW 47uf 63v.

I agree with you on a little harsh sound. I changed the red wire to the binding posts with furutech cable and filled/replaced ceramic SMD cap with 10uf Nichicon muse BP capacitors and it went well.

Don't misunderstanding. The amp is as good as it should be for the price or better but I think the power supply does not have soft start. The electric has down for 1 second and suddenly surge up. I was always warned that I should have a 10-20uf cap series to the tweeter but the thing went well...

Sadly , last night it burn one of my tweeter because of electrical surge.

It has Lt. and Rt volume control but I only use my ears to adjust the balance. Actually I use it as one of my 4 amps in active 4 ways speakers because it has xlr.

Except 4 DC blocking input capacitor to TPA3255. It is just only 1 uf with leftover area of SMD. According to TPA3255 manual , it should be at least 10uf.

DC blocking input cap are ceramic SMD pararelled with MKT Epcos 1uf 63v.

Other supplies , the black 8 , are Lelon capacitor RXK 470uf 16v Low ESR 105

Reservoir capacitor , the 5 green , is Samxon GF capacitor 820uf 50v high ripple , low impedance 105

TPA3255 base amplifier with xlr input. Suca Audio U7 or other models with similar chassis . Got it from aliexpress around $87. This amp is the cheapest of all 4.

Regulated switching power supply +- 34.5v (Rubycon YXJ 50v1000uF) +5v.regulator AMS1117-5 , -5v.regulator 79L05 supply all 3 op-amp (2*TL072C,1*OPA1678) and NJW1194 coupling input capacitor Nichicon wz 22uF35v should be replaced by better cap.